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Financial Instruments - Cash Flow Hedges After-tax Gains/(Losses) (Details) - Cash flow hedges - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
After-tax gains/(losses) recognized in other comprehensive earnings/(losses)	$ (3)	$ (23)
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
After-tax gains/(losses) reclassified from accumulated other comprehensive income into earnings/(losses)	(5)	(81)
After-tax gains/(losses) recognized in other comprehensive earnings/(losses)	(2)	(23)
Currency exchange contracts | Forecasted transactions
Derivative Instruments, Gain (Loss) [Line Items]
After-tax gains/(losses) recognized in other comprehensive earnings/(losses)	$ (1)	$ 0

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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