Consolidated Statements Of Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income (loss)	$ 1,234	$ (1,319)	$ 53
Unrealized gains (losses) arising during the period, net of tax of $71, $96 and $10	143	209	134
Less: Reclassification adjustments for (gains) losses included in net income (loss), net of tax of $4, $17 and $82	7	32	152
Unrealized gains (losses) on available-for-sale securities, net	150	241	286
Other-than-temporary impairments arising during the period, net of tax of $18, $3 and $14	32	(5)	(26)
Less: Reclassification adjustments for other-than-temporary impairments included in net income (loss), net of tax of $24, $12 and $30	45	22	55
Other-than-temporary impairments on available-for-sale securities, net	77	17	29
Unrealized gains (losses) on derivative instruments arising during the period, net of tax of $1, $2 and $2	2	(5)	(3)
Less: Reclassification adjustments for (gains) losses included in net income (loss), net of tax of $10, $5 and $9	18	10	17
Unrealized gains (losses) on derivative instruments, net	20	5	14
Foreign currency translation, net of tax of $2, $1 and $2	(15)	(33)	(143)
Total other comprehensive income (loss)	232	230	186
Comprehensive income (loss)	$ 1,466	$ (1,089)	$ 239