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Income Taxes - Reconciliation of Uncertain Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Uncertain tax benefits
Uncertain tax benefits	$ 15	$ 26	$ 15	$ 15
Liability for uncertainty in income taxes, noncurrent			18	17
Unrecognized tax benefits, income tax penalties expense	1
Accrued interest and penalties related to unrecognized tax benefits			$ 3	$ 2
Uncertain tax benefits reconciliation
Balance as of January 1	15	26
Increase due to current year positions	3	2
Settlements, payments and statute closure	(3)	(13)
Uncertain tax benefits as of December 31	$ 15	$ 15

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Amount recognized for uncertainty in income taxes classified as noncurrent.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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