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CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (230)	$ 33	$ (153)	$ 57
Other comprehensive income:
Unrealized investment gain	0	4	1	13
Less: effect of income taxes	0	2	0	5
Other comprehensive income, net of tax	0	2	1	8
Comprehensive (loss) income	$ (230)	$ 35	$ (152)	$ 65

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

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