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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1,	$ 2	$ 0	$ 6
Gross amounts of decreases in unrecognized tax benefits as a result of adjustments to tax provisions taken during the prior period	0	0	(6)
Gross amounts of increases in unrecognized tax benefits as a result of tax positions taken during the current period	7	2	0
Reduction to unrecognized tax benefits as a result of a lapse of the applicable statute of limitations	0	0	0
Balance at December 31,	9	2	0
Total unrecognized tax benefits, if recognized, that would impact the effective tax rate	9	2	0
Total amount of interest and penalties recognized in the consolidated statements of operations	0	0	0
Total amount of interest and penalties recognized in the consolidated balance sheets	$ 0	$ 0	$ 0

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 10B
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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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- Definition

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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Amount of expense 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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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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

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