v3.10.0.1
Revenue from Contracts with Customers - Impact on Financial Statements (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Revenues          
Revenues from Customers $ 3,851   $ 10,501    
Gains (losses) on divestitures and other, net 90 $ (114) 232 $ 1,052  
Expenses          
Income tax expense (benefit) 256 (425) 507 (366)  
Net income (loss) attributable to noncontrolling interests 64 58 105 182  
Net income (loss) attributable to common stockholders 363 (699) 513 (1,432)  
Assets          
Other current assets 397   397   $ 380
Net properties and equipment 28,744   28,744   27,451
Other Assets 2,292   2,292   2,211
Liabilities          
Other current liabilities 1,502   1,502   1,310
Deferred income taxes 2,455   2,455   2,234
Other 4,043   4,043   4,109
Equity          
Total equity 11,237   11,237   $ 13,790
Accounting Standards Update 2014-09 [Member] | Without Adoption of Topic 606 [Member]          
Revenues          
Gains (losses) on divestitures and other, net 89   233    
Expenses          
Income tax expense (benefit) 254   507    
Net income (loss) attributable to noncontrolling interests 71   111    
Net income (loss) attributable to common stockholders 358   514    
Assets          
Other current assets 395   395    
Net properties and equipment 28,697   28,697    
Other Assets 2,282   2,282    
Liabilities          
Other current liabilities 1,494   1,494    
Deferred income taxes 2,461   2,461    
Other 3,932   3,932    
Equity          
Total equity 11,291   11,291    
Accounting Standards Update 2014-09 [Member] | Effect of Change Increase/ (Decrease) [Member]          
Revenues          
Gains (losses) on divestitures and other, net 1   (1)    
Expenses          
Income tax expense (benefit) 2   0    
Net income (loss) attributable to noncontrolling interests (7)   (6)    
Net income (loss) attributable to common stockholders 5   (1)    
Assets          
Other current assets 2   2    
Net properties and equipment 47   47    
Other Assets 10   10    
Liabilities          
Other current liabilities 8   8    
Deferred income taxes (6)   (6)    
Other 111   111    
Equity          
Total equity (54)   (54)    
Gathering, processing, and marketing [Member]          
Revenues          
Revenues from Customers 421 509 1,163 1,417  
Expenses          
Gathering, processing, and marketing 256 $ 396 745 $ 1,101  
Gathering, processing, and marketing [Member] | Accounting Standards Update 2014-09 [Member] | Without Adoption of Topic 606 [Member]          
Revenues          
Revenues from Customers 717   1,944    
Expenses          
Gathering, processing, and marketing 551   1,520    
Gathering, processing, and marketing [Member] | Accounting Standards Update 2014-09 [Member] | Effect of Change Increase/ (Decrease) [Member]          
Revenues          
Revenues from Customers (296)   (781)    
Expenses          
Gathering, processing, and marketing $ (295)   $ (775)