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Financial Instruments - Impact of Changes in Fair Value of Fair Value Hedges and Not Designated as Hedging Instruments on Earnings (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest expense | Fair Value Hedges | Interest rate contracts
Fair Value Hedges
Interest rate derivatives, fair value hedges	$ 31	$ 31	$ 9
Other, Net | Foreign exchange contracts | Derivatives not designated as hedging instruments
Not Designated as Hedges
Foreign exchange contracts, not designated as hedges	$ 86	$ (73)	$ 68

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Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

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