Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax [Line Items]
Tax Act, tax benefit			$ (7)
Net deferred tax assets	$ 0	$ 69
Deferred tax assets after valuation allowance	471
Gross deferred tax liabilities	471	181
Unrecognized tax benefits	70	24	$ 20
Unrecognized tax benefits that would impact effective tax rate	29
Interest and income taxes accrued	11	3
Penalties and interest expense	8	$ 1
Domestic Tax Authority
Income Tax [Line Items]
Deferred tax assets after valuation allowance	47
Decrease in unrecognized tax benefits is reasonably possible	44
State and Local Jurisdiction
Income Tax [Line Items]
Deferred tax assets after valuation allowance	9
Decrease in unrecognized tax benefits is reasonably possible	$ 7