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Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statements of Comprehensive Income (Loss)
Net income (loss)	$ (27)	$ 64	$ (105)	$ 133
Unrealized gains (losses) on available-for-sale securities: [Abstract]
Unrealized gains (losses) arising during the period	101	(129)	224	(86)
Provision (benefit) for income taxes	36	(47)	79	(30)
Total	65	(82)	145	(56)
Reclassification adjustments for (gains) losses included in net income (loss)	13	(3)	8	4
Provision (benefit) for income taxes	5	(1)	3	2
Total	8	(2)	5	2
Available-for-sale securities with other-than-temporary impairments: [Abstract]
Other-than-temporary impairments and unrealized gains (losses) arising during the period	10	10	7	(4)
Provision (benefit) for income taxes	3	4	2	(1)
Total	7	6	5	(3)
Foreign currency translation: [Abstract]
Foreign currency translation gains (losses)	(41)	30	(55)	(1)
Provision (benefit) for income taxes	(14)	10	(19)	(1)
Total	(27)	20	(36)	0
Total other comprehensive income (loss)	53	(58)	119	(57)
Comprehensive income (loss)	$ 26	$ 6	$ 14	$ 76

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