Consolidated Statement of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net Income (Loss) Attributable to Parent [Abstract]
Net income (loss)	$ 278	$ 27	$ 540	$ 130
Other comprehensive income (loss):
Unrealized gain (loss) on investments, net of tax	0	0	0	3
Other Comprehensive Income (Loss), Net of Tax	0	0	0	3
Comprehensive income (loss)	$ 278	$ 27	$ 540	$ 133