Financial Instruments - Summary of Derivative Instruments Gain (Losses) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Interest Rate Contract \| Fair Value Hedges \| Interest Expense
Summary of Derivative Instruments Gains (Losses) [Abstract]
Derivative (loss) gain recognized in interest expense	$ 0	$ 0	$ (1)	$ 4
Hedged item gain (loss) recognized in interest expense	0	0	1	(4)
Foreign exchange contracts - forwards \| Cash Flow Hedges
Summary of Derivative Instruments Gains (Losses) [Abstract]
Derivative gain recognized in OCI (effective portion)	1	4	5	10
Foreign exchange contracts - forwards \| Cash Flow Hedges \| Cost of Sales
Summary of Derivative Instruments Gains (Losses) [Abstract]
Derivative gain reclassified from AOCL to income - Cost of sales (effective portion)	$ 0	$ 3	$ 1	$ 6

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Amount of unrealized gain (loss) included in earnings related to the fair value of the hedged item in an interest rate fair value hedge, offset by the gain (loss) on the hedging instrument to the extent that the fair value hedge is determined to be effective.

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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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Amount, before 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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