v3.8.0.1
Segment Information (Reconciliation of Total Segment Income from Operations to Consolidated Income before Income Taxes) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting [Abstract]    
Income from operations $ 401 $ 234
Interest expense (37) (40)
Other income (expense), net 22 7
Income before income taxes $ 386 $ 201