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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]        
Accumulated (loss)/gain at beginning of period $ (236) $ (159) $ (167) $ (113)
Transfer of realized losses/(gains) in fair value to earnings 12 5 12 (9)
Unrealized (loss)/gain in fair value (74) 21 (143) (11)
Accumulated (loss)/gain at end of period $ (298) $ (133) $ (298) $ (133)