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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Unrecognized Tax Benefits
Gross unrecognized tax benefit balances	$ 18	$ 16	$ 34
Reductions based on settlements with taxing authority	0	$ (21)	$ (73)
Unrecognized Tax Benefits, Other Disclosures
Unrecognized tax benefits, if recognized, which would affect effective tax rate	18
Estimate of decrease in unrecognized tax benefits in next year	1
Unrecognized tax benefits balance reasonably possible next year	$ 17

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Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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Amount of unrecognized tax benefits.

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