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Financial Instruments - Cash Flow Hedges After-tax Gains/(Losses) (Details) - Cash Flow Hedges - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]      
After-tax gains (losses) reclassified from accumulated other comprehensive income into earnings/(losses) $ 39 $ 155 $ (161)
After-tax gains (losses) reclassified from accumulated other comprehensive income/(loss) 153 168 (109)
Interest rate contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
After-tax gains (losses) reclassified from accumulated other comprehensive income into earnings/(losses) 47 155 (161)
After-tax gains (losses) reclassified from accumulated other comprehensive income/(loss) 145 168 (107)
Currency exchange contracts | Forecasted transactions      
Derivative Instruments, Gain (Loss) [Line Items]      
After-tax gains (losses) reclassified from accumulated other comprehensive income into earnings/(losses) (8) 0 0
After-tax gains (losses) reclassified from accumulated other comprehensive income/(loss) $ 8 $ 0 $ (2)