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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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
After-tax gains/(losses) recognized in other comprehensive earnings/(losses)	$ 13	$ (6)	$ 10	$ (29)
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
After-tax gains/(losses) reclassified from accumulated other comprehensive income into earnings/(losses)	(4)	(7)	(9)	(88)
After-tax gains/(losses) recognized in other comprehensive earnings/(losses)	6	(5)	4	(28)
Currency exchange contracts | Forecasted transactions
Derivative Instruments, Gain (Loss) [Line Items]
After-tax gains/(losses) recognized in other comprehensive earnings/(losses)	$ 7	$ (1)	$ 6	$ (1)

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

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