Equity OCI - 1 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Equity [Abstract]
Net income (loss)	$ 8,744		$ 1,813		$ 77,524		$ 9,650
Other comprehensive income, net of tax effect:
Changes in net unrealized gains (losses) on available-for-sale securities net of tax	70		719		805		974
Reclassification adjustment for other-than-temporary impairments recognized in net income, net of tax	17		25		27		456
Reclassification adjustment for gains on available-for-sale included in net income, net of tax	(220)		(3)		(300)		(14)
Other	(1)	[1]	5	[1]	154	[1]	20	[1]
Total other comprehensive income (loss)	(134)		746		686		1,436
Total comprehensive income (loss)	8,610		2,559		78,210		11,086
Other Comprehensive (Income) Loss Parenthetical Disclosures [Abstract]
Changes in net unrealized (losses) gains on available-for-sale securities, tax benefit (expense)	37		386		433		536
Reclassication adjustment for other-than-temporary impairments recognized in net income (loss), tax benefit (expense)	10		13		15		245
Reclassification adjustment for gains included in net income (loss), tax benefit (expense)	$ 119		$ 2		$ 162		$ 8

[1] Primarily represents activity from our defined benefit pension plans.