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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
After-tax gains (losses) reclassified from accumulated other comprehensive income/(loss)	$ (109)	$ (199)	$ (45)
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
After-tax gains (losses) reclassified from accumulated other comprehensive income into earnings/(losses)	(161)	(154)	9
After-tax gains (losses) reclassified from accumulated other comprehensive income/(loss)	(107)	(202)	(45)
Currency exchange contracts | Forecasted transactions
Derivative Instruments, Gain (Loss) [Line Items]
After-tax gains (losses) reclassified from accumulated other comprehensive income/(loss)	$ (2)	$ 3	$ 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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