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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
After-tax gains/(losses) recognized in other comprehensive earnings/(losses) | $ (6) | $ (74) | $ (29) | $ (139)
Interest rate contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
After-tax gains/(losses) reclassified from accumulated other comprehensive income into earnings/(losses) | (7) | (12) | (88) | (12)
After-tax gains/(losses) recognized in other comprehensive earnings/(losses) | (5) | (77) | (28) | (142)
Currency exchange contracts | Forecasted transactions |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
After-tax gains/(losses) recognized in other comprehensive earnings/(losses) | $ (1) | $ 3 | $ (1) | $ 3

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