Derivative and Hedging Instruments Classification of Outstanding Forward Contracts (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Prepaid Expenses and Other Current Assets
Foreign Exchange Risk Management
Forward contracts to purchase and sell foreign currency - Balance sheet location - Accounts receivable	$ 19	$ 12
Other Current Liabilities
Foreign Exchange Risk Management
Forward contracts to purchase and sell foreign currency - Balance sheet location - Other current liabilities	(28)	(32)
Commitments to purchase foreign currency \| Foreign Exchange Forward
Foreign Exchange Risk Management
Commitments to purchase/sell foreign currency, Notional	389	185
Commitments to purchase/sell foreign currency, Estimated Fair Value	17	3
Commitments to sell foreign currency \| Foreign Exchange Forward
Foreign Exchange Risk Management
Commitments to purchase/sell foreign currency, Notional	1,110	1,506
Commitments to purchase/sell foreign currency, Estimated Fair Value	(26)	(25)
Commitments to sell foreign currency \| Foreign Exchange Option
Foreign Exchange Risk Management
Commitments to purchase/sell foreign currency, Notional	0	21
Commitments to purchase/sell foreign currency, Estimated Fair Value	$ 0	$ 2

Fair value of the assets less the liabilities of a derivative or group of derivatives.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
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