Equity OCI - 1 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Equity [Abstract]
Net income (loss)	$ 58,685	$ 2,718
Other comprehensive income, net of tax effect:
Changes in net unrealized gains (losses) on available-for-sale securities (net of tax of $349 and $196, respectively)	649	319
Reclassification adjustment for other-than-temporary impairments recognized in net income (loss) (net of tax of $3 and $22, respectively)	5	42
Reclassification adjustment for gains included in net income (loss) (net of tax of $3)	(6)	(6)
Other	6	7
Total other comprehensive income (loss)	654	362
Total comprehensive income (loss)	59,339	3,080
OCI, Parenthetical Disclosures [Abstract]
Changes in net unrealized (losses) gains on available-for-sale securities, tax benefit (expense)	349	196
Reclassification adjustment for other-than-temporary impairments recognized in net income (loss), tax benefit (expense)	3	22
Reclassification adjustment for gains included in net income (loss), tax benefit (expense)	$ 3	$ 3