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Income Taxes - U.S. Tax Cuts and Jobs Act (Tax Act) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019
Income Taxes [Line Items]
Tax Cuts and Jobs Act, Income Tax Expense (Benefit)	$ (61)
Deemed repatriation tax payable		$ 230	$ 261
Tax Act liabilities for deemed repatriation (Note 5)		204	$ 235
Other Noncurrent Liabilities
Income Taxes [Line Items]
Tax Act liabilities for deemed repatriation (Note 5)	235	$ 204
United States
Income Taxes [Line Items]
Tax Cuts and Jobs Act, Income Tax Expense (Benefit)	(41)
State and Local Jurisdiction
Income Taxes [Line Items]
Tax Cuts and Jobs Act, Income Tax Expense (Benefit)	$ (20)

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[Line Items] for Income Taxes [Table]

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Amount of income tax expense (benefit) from effect of Tax Cuts and Jobs Act.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

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Amount of tax liability from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-URI http://asc.fasb.org/topic&trid=2144680

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Amount of tax liability from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act, classified as noncurrent.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-URI http://asc.fasb.org/topic&trid=2144680

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