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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
After-tax gains/(losses) recognized in other comprehensive earnings/(losses) | $ 45 | $ (69) | $ 151 | $ (98)
Interest rate contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
After-tax gains/(losses) reclassified from accumulated other comprehensive income into earnings/(losses) | 52 | (65) | 139 | (153)
After-tax gains/(losses) recognized in other comprehensive earnings/(losses) | 51 | (69) | 151 | (97)
Currency exchange contracts | Forecasted transactions |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
After-tax gains/(losses) recognized in other comprehensive earnings/(losses) | $ (6) | $ 0 | $ 0 | $ (1)

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