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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Provision for (benefit from) income taxes	$ (101)	$ 23	$ (395)	$ (215)
Increase in gross unrecognized tax benefits			206
Unrecognized tax benefits that would impact effective tax rate	50		50
Unrecognized tax benefits that would not impact effective tax rate	$ 156		$ 156

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Unrecognized Tax Benefits that Would Not Impact Effective Tax Rate

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Name Accounting Standards Codification
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Amount of increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions taken in tax returns.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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