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Derivative Financial Instruments - Summary of Classification and Fair Value of Derivative Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Fair value of asset derivatives	$ 12	$ 37
Fair value of liability derivatives	(121)	(8)
Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of asset derivatives	0	36
Fair value of liability derivatives	(120)	(8)
Designated as hedging instrument | Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Fair value of asset derivatives	0	36
Designated as hedging instrument | Other accrued liabilities
Derivatives, Fair Value [Line Items]
Fair value of liability derivatives	(113)	(6)
Designated as hedging instrument | Other long-term assets
Derivatives, Fair Value [Line Items]
Fair value of asset derivatives	0	0
Designated as hedging instrument | Other long-term obligations
Derivatives, Fair Value [Line Items]
Fair value of liability derivatives	(7)	(2)
Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of asset derivatives	12	1
Fair value of liability derivatives	(1)	0
Not designated as hedging instrument | Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Fair value of asset derivatives	12	1
Not designated as hedging instrument | Other accrued liabilities
Derivatives, Fair Value [Line Items]
Fair value of liability derivatives	$ (1)	$ 0

X

- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and elected not to be offset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and elected not to be offset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Details

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- Details

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- Details

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- Details

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