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Financial Instruments - Cash Flow Hedges Effect on Accumulated Other Comprehensive Earnings/(Losses), Net of Tax (Details) - Cash Flow Hedges - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]        
Accumulated (loss)/gain at beginning of period $ (133) $ (91) $ (113) $ (121)
Transfer of realized (gains)/losses in fair value to earnings 0 (13) (9) (10)
Unrealized gain/(loss) in fair value 25 (6) 14 21
Accumulated (loss)/gain at end of period $ (108) $ (110) $ (108) $ (110)