Derivative Instruments - Effects of Derivative Instruments (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivatives not designated as hedging instruments \| Foreign exchange derivative contracts
Derivatives and Hedges
Amount of Gain (Loss) Recognized in Other income (expense), net	$ 9	$ 10	$ 1
Derivatives designated as hedging instruments
Derivatives and Hedges
Gain (Loss) Recognized in OCI (Effective Portion)	(153)	37	16
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(112)	(37)	10
Derivatives designated as hedging instruments \| Net Investment Hedges
Derivatives and Hedges
Gain (Loss) Recognized in OCI (Effective Portion)	(54)	10	5
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	4	(7)	1
Derivatives designated as hedging instruments \| Foreign exchange risk \| Cash Flow Hedges \| Other income (expense)
Derivatives and Hedges
Gain (Loss) Recognized in OCI (Effective Portion)	(99)	28	12
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(115)	(30)	9
Derivatives designated as hedging instruments \| Interest rate risk \| Cash Flow Hedges \| Interest expense, net
Derivatives and Hedges
Gain (Loss) Recognized in OCI (Effective Portion)		$ (1)	$ (1)
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ (1)

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

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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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
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-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959

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-Topic 815
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