Consolidated Statement Of Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement of Comprehensive Income (Loss)
Net income (loss)	$ 132	$ 7	$ 118	$ 598
Unrealized gains (losses) on available-for-sale securities: [Abstract]
Unrealized gains (losses) arising during the period	(15)	75	(155)	236
Provision (benefit) for income taxes	(6)	18	(55)	70
Total	(9)	57	(100)	166
Reclassification adjustments for (gains) losses included in net income (loss)	13	(8)	(6)	84
Provision (benefit) for income taxes	5	(3)	(2)	29
Total	8	(5)	(4)	55
Available-for-sale securities with other-than-temporary impairments:
Other-than-temporary impairments and unrealized gains (losses) arising during the period	8	2	15	40
Provision (benefit) for income taxes	2	1	6	14
Total	6	1	9	26
Reclassification adjustments for gains (losses) included in net income (loss)	(1)	6	(5)	52
Provision (benefit) for income taxes	(1)	2	(2)	18
Total	0	4	(3)	34
Foreign currency translation: [Abstract]
Foreign currency translation gains (losses)	32	(7)	(7)	(18)
Provision (benefit) for income taxes	1	(4)	1	(3)
Total	31	(3)	(8)	(15)
Total other comprehensive income (loss)	36	54	(106)	266
Comprehensive income (loss)	$ 168	$ 61	$ 12	$ 864