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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
Mar. 31, 2018
Mar. 31, 2017
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]    
Accumulated (loss)/gain at beginning of period $ (113) $ (121)
Transfer of realized (gains)/losses in fair value to earnings (14) 7
Unrealized gain/(loss) in fair value (32) 11
Accumulated (loss)/gain at end of period $ (159) $ (103)