Consolidated Statement Of Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income (Loss)
Net income (loss)	$ 569	$ 250	$ 1,234
Unrealized gains (losses) on available-for-sale securities: [Abstract]
Unrealized gains (losses) arising during the period	254	(213)	176
Provision (benefit) for income taxes	83	(76)	72
Total	171	(137)	104
Reclassification adjustments for (gains) losses included in net income (loss)	15	(13)	39
Provision (benefit) for income taxes	6	(5)	14
Total	9	(8)	25
Available-for-sale securities with other-than-temporary impairments: [Abstract]
Other-than-temporary impairments and unrealized gains (losses) arising during the period	(85)	15	50
Provision (benefit) for income taxes	(31)	6	18
Total	(54)	9	32
Reclassification adjustments for (gains) losses included in net income (loss)	6	(5)	69
Provision (benefit) for income taxes	2	(2)	24
Total	4	(3)	45
Foreign currency translation: [Abstract]
Foreign currency translation gains (losses)	(40)	3	24
Provision (benefit) for income taxes	(13)	1	(2)
Total	(27)	2	26
Reclassification adjustments for (gains) losses included in net income (loss)	4	(5)	0
Provision (benefit) for income taxes	0	0	0
Total	4	(5)	0
Total other comprehensive income (loss)	107	(142)	232
Comprehensive income (loss)	$ 676	$ 108	$ 1,466