Income Taxes - Unrecognized Tax Benefits - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
Unrecognized tax balance	$ 420	$ 387	$ 544	$ 487
Unrecognized tax benefits that would impact effective tax rate	295
Interest and penalties in uncertain tax positions	10
Unrecognized tax benefits, interest and penalties accrued	39	$ 46
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Income Tax Contingency [Line Items]
Unrecognized tax balance	50
Unrecognized tax benefits that would impact effective tax rate	$ 47