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Condensed Financial Information of Registrant - Condensed Statements of Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Net (loss) income	$ (262)	$ (97)	$ (230)	$ 77	$ (47)	$ 42	$ 33	$ 24	$ (512)	$ 52	$ 143
Unrealized investment (loss) gain									(5)	3	(5)
Less: effect of income taxes									(2)	1	(2)
Other comprehensive (loss) income, net of tax									(3)	2	(3)
Comprehensive (loss) income									(515)	54	140
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net (loss) income									(512)	52	143
Unrealized investment (loss) gain									(5)	3	(5)
Less: effect of income taxes									(2)	1	(2)
Other comprehensive (loss) income, net of tax									(3)	2	(3)
Comprehensive (loss) income									$ (515)	$ 54	$ 140

X

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount before tax and reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.

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