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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 77	$ 24
Other comprehensive income:
Unrealized investment gain	1	9
Less: effect of income taxes	0	3
Other comprehensive income, net of tax	1	6
Comprehensive income	$ 78	$ 30

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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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