Income Taxes - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Income Tax Contingency [Line Items]
Deferred Tax Assets, Valuation Allowance	$ 130	$ 0
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	99
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	11
Unrecognized Tax Benefits, Income Tax Penalties Accrued	1
Decrease in Unrecognized Tax Benefits is Reasonably Possible	25
State and Local Jurisdiction [Member]
Income Tax Contingency [Line Items]
Deferred Tax Assets, Valuation Allowance	$ 130

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

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of statutory penalties accrued for a tax position claimed or expected to be claimed by the entity, in its tax return.

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Amount of interest expense accrued for an underpayment of income taxes.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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