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Financial Instruments - Cash Flow Hedges After-tax Gains/(Losses) (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) [Line Items]        
Gains/(losses), net of taxes, reclassified from accumulated other comprehensive income into earnings $ (12) $ (5) $ (12) $ 9
Net derivative gains/(losses) (74) 21 (143) (11)
Currency exchange contracts | Forecasted transactions        
Derivative Instruments, Gain (Loss) [Line Items]        
Net derivative gains/(losses) 3 0 3 0
Interest rate contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains/(losses), net of taxes, reclassified from accumulated other comprehensive income into earnings (12) (5) (12) 9
Net derivative gains/(losses) $ (77) $ 21 $ (146) $ (11)