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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 107	$ 77
Other comprehensive (loss) income:
Unrealized investment (loss) gain	(7)	1
Less: effect of income taxes	0	0
Other comprehensive (loss) income, net of tax	(7)	1
Comprehensive income	$ 100	$ 78

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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