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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]        
Accumulated (loss)/gain at beginning of period $ (159) $ (103) $ (113) $ (121)
Transfer of realized (gains)/losses in fair value to earnings 5 (4) (9) 3
Unrealized gain/(loss) in fair value 21 16 (11) 27
Accumulated (loss)/gain at end of period $ (133) $ (91) $ (133) $ (91)