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Financial Instruments - Cash Flow Hedges After-tax Gains/(Losses) (Details) - Cash flow hedges - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]        
After-tax gains/(losses) recognized in other comprehensive earnings/(losses) $ (69) $ (75) $ (98) $ (214)
Currency exchange contracts | Forecasted transactions        
Derivative Instruments, Gain (Loss) [Line Items]        
After-tax gains/(losses) recognized in other comprehensive earnings/(losses) 0 0 (1) 3
Interest rate contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
After-tax gains/(losses) reclassified from accumulated other comprehensive income into earnings/(losses) (65) (111) (153) (123)
After-tax gains/(losses) recognized in other comprehensive earnings/(losses) $ (69) $ (75) $ (97) $ (217)