v3.19.1
Condensed Consolidating Financial Information (Condensed Consolidating Statement of Operations) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Condensed Income Statements, Captions [Line Items]    
Total operating revenues $ 990 $ 920
Operating expenses 165 189
General and administrative expenses 37 55
Restructuring charges 3 0
Depreciation, depletion and amortization 112 143
Taxes, other than income taxes 19 23
Total operating costs and expense 777 665
Operating Income 213 255
Interest Expense, Net 14 39
Loss on Derivatives (32) (7)
Other Income (Loss), Net 1 (1)
Equity in Earnings of Subsidiaries 0 0
Income (Loss) Before Income Taxes 168 208
Benefit from income taxes (426) 0
Net Income 594 208
Participating securities - mandatory convertible preferred stock 0 3
Net Income Attributable to Common Stock 594 205
Other comprehensive income 0 0
Comprehensive income 594 208
Eliminations    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 0 0
Operating expenses 0 0
General and administrative expenses 0 0
Restructuring charges 0  
Depreciation, depletion and amortization 0 0
Taxes, other than income taxes 0 0
Total operating costs and expense 0 0
Operating Income 0 0
Interest Expense, Net 0 0
Loss on Derivatives 0 0
Other Income (Loss), Net 0 0
Equity in Earnings of Subsidiaries (608) (247)
Income (Loss) Before Income Taxes (608) (247)
Benefit from income taxes 0 0
Net Income (608) (247)
Participating securities - mandatory convertible preferred stock   0
Net Income Attributable to Common Stock   (247)
Other comprehensive income 0 0
Comprehensive income (608) (247)
Parent    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 0 0
Operating expenses 0 0
General and administrative expenses 0 0
Restructuring charges 0  
Depreciation, depletion and amortization 0 0
Taxes, other than income taxes 0 0
Total operating costs and expense 0 0
Operating Income 0 0
Interest Expense, Net 14 39
Loss on Derivatives 0 0
Other Income (Loss), Net 0 0
Equity in Earnings of Subsidiaries 608 247
Income (Loss) Before Income Taxes 594 208
Benefit from income taxes 0 0
Net Income 594 208
Participating securities - mandatory convertible preferred stock   3
Net Income Attributable to Common Stock   205
Other comprehensive income 0 0
Comprehensive income 594 208
Guarantors    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 990 920
Operating expenses 165 189
General and administrative expenses 37 55
Restructuring charges 3  
Depreciation, depletion and amortization 112 143
Taxes, other than income taxes 19 23
Total operating costs and expense 777 665
Operating Income 213 255
Interest Expense, Net 0 0
Loss on Derivatives (32) (7)
Other Income (Loss), Net 1 (1)
Equity in Earnings of Subsidiaries 0 0
Income (Loss) Before Income Taxes 182 247
Benefit from income taxes (426) 0
Net Income 608 247
Participating securities - mandatory convertible preferred stock   0
Net Income Attributable to Common Stock   247
Other comprehensive income 0 0
Comprehensive income 608 247
Non-Guarantors    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 0 0
Operating expenses 0 0
General and administrative expenses 0 0
Restructuring charges 0  
Depreciation, depletion and amortization 0 0
Taxes, other than income taxes 0 0
Total operating costs and expense 0 0
Operating Income 0 0
Interest Expense, Net 0 0
Loss on Derivatives 0 0
Other Income (Loss), Net 0 0
Equity in Earnings of Subsidiaries 0 0
Income (Loss) Before Income Taxes 0 0
Benefit from income taxes 0 0
Net Income 0 0
Participating securities - mandatory convertible preferred stock   0
Net Income Attributable to Common Stock   0
Other comprehensive income 0 0
Comprehensive income 0 0
Gas sales    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 430 540
Gas sales | Eliminations    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 0 0
Gas sales | Parent    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 0 0
Gas sales | Guarantors    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 430 540
Gas sales | Non-Guarantors    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 0 0
Oil sales    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 39 35
Oil sales | Eliminations    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 0 0
Oil sales | Parent    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 0 0
Oil sales | Guarantors    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 39 35
Oil sales | Non-Guarantors    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 0 0
NGL sales    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 81 65
NGL sales | Eliminations    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 0 0
NGL sales | Parent    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 0 0
NGL sales | Guarantors    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 81 65
NGL sales | Non-Guarantors    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 0 0
Marketing    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 438 253
Marketing | Eliminations    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 0 0
Marketing | Parent    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 0 0
Marketing | Guarantors    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 438 253
Marketing | Non-Guarantors    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 0 0
Gas gathering    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 0 24
Gas gathering | Eliminations    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues   0
Gas gathering | Parent    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues   0
Gas gathering | Guarantors    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues   24
Gas gathering | Non-Guarantors    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues   0
Other    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 2 3
Other | Eliminations    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 0 0
Other | Parent    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 0 0
Other | Guarantors    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 2 3
Other | Non-Guarantors    
Condensed Income Statements, Captions [Line Items]    
Total operating revenues 0 0
Marketing purchases    
Condensed Income Statements, Captions [Line Items]    
Marketing purchases 441 255
Marketing purchases | Eliminations    
Condensed Income Statements, Captions [Line Items]    
Marketing purchases 0 0
Marketing purchases | Parent    
Condensed Income Statements, Captions [Line Items]    
Marketing purchases 0 0
Marketing purchases | Guarantors    
Condensed Income Statements, Captions [Line Items]    
Marketing purchases 441 255
Marketing purchases | Non-Guarantors    
Condensed Income Statements, Captions [Line Items]    
Marketing purchases $ 0 $ 0