Derivative Instruments - Effect of Derivative Contracts on Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Foreign Exchange Contract
Effect of Derivative Contracts on Accumulated Other Comprehensive Income:
Less: Amount of Gain (Loss) Reclassified From AOCI to Earnings	$ (5)	$ 70	$ (2)
Designated as Hedging Instrument \| Cash Flow Hedging
Effect of Derivative Contracts on Accumulated Other Comprehensive Income:
Beginning balance	(9)
Amount of Gain (Loss) Recognized in Other Comprehensive Income	(61)
Less: Amount of Gain (Loss) Reclassified From AOCI to Earnings	15
Ending balance	(85)	(9)
Designated as Hedging Instrument \| Cash Flow Hedging \| Foreign Exchange Contract
Effect of Derivative Contracts on Accumulated Other Comprehensive Income:
Beginning balance	(9)	68
Amount of Gain (Loss) Recognized in Other Comprehensive Income	(71)	4
Less: Amount of Gain (Loss) Reclassified From AOCI to Earnings	15	81
Ending balance	(95)	(9)	$ 68
Designated as Hedging Instrument \| Cash Flow Hedging \| Interest Rate Contract
Effect of Derivative Contracts on Accumulated Other Comprehensive Income:
Beginning balance	0
Amount of Gain (Loss) Recognized in Other Comprehensive Income	10
Less: Amount of Gain (Loss) Reclassified From AOCI to Earnings	0
Ending balance	$ 10	$ 0

Derivative instruments gain (loss) roll forward

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- Definition

Amount, after tax, of accumulated gain (loss) on derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580

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