Consolidated Statement Of Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income (Loss)
Net income (loss)	$ 120	$ (178)	$ 376	$ (14)
Unrealized gains (losses) on available-for-sale securities: [Abstract]
Unrealized gains (losses) arising during the period	79	(153)	184	(140)
Provision (benefit) for income taxes	26	(53)	64	(49)
Total	53	(100)	120	(91)
Reclassification adjustments for (gains) losses included in net income (loss)	13	6	15	(19)
Provision (benefit) for income taxes	5	2	6	(7)
Total	8	4	9	(12)
Available-for-sale securities with other-than-temporary impairments: [Abstract]
Other-than-temporary impairments and unrealized gains (losses) arising during the period	(4)	2	(1)	7
Provision (benefit) for income taxes	(1)	2	(1)	4
Total	(3)	0	0	3
Reclassification adjustments for (gains) losses included in net income (loss)	7	(4)	7	(4)
Provision (benefit) for income taxes	2	(1)	2	(1)
Total	5	(3)	5	(3)
Foreign currency translation: [Abstract]
Foreign currency translation gains (losses)	9	4	7	(39)
Provision (benefit) for income taxes	3	0	3	0
Total	6	4	4	(39)
Reclassification adjustments for (gains) losses included in net income (loss)	0	0	4	0
Provision (benefit) for income taxes	0	0	0	0
Total	0	0	4	0
Total other comprehensive income (loss)	69	(95)	142	(142)
Comprehensive income (loss)	$ 189	$ (273)	$ 518	$ (156)