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Investments in Securities Accumulated Other Comprehensive Income 2 (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Investments, Debt and Equity Securities [Abstract]        
Net income (loss) $ 5,119 $ (2,892) $ 7,837 $ (9,363)
Other comprehensive income (loss), net of tax effect:        
Changes in net unrealized (losses) gains on available-for-sale securities (net of tax of $46 and $19, respectively, for the three months ended and net of tax of $150 and $68, respectively, for the six months ended) (64) (34) 255 127
Reclassification adjustment for other-than-temporary impairments recognized in net income (loss) (net of tax of $210 and $15, respectively, for the three months ended and $232 and $28, respectively, for the six months ended) 389 40 431 72
Reclassification adjustment for gains included in net income (loss) (net of tax of $3 for the three months ended and net of tax of $6 and $11, respectively, for the six months ended) (5) (7) (11) (21)
Other 8 3 15 5
Other comprehensive income 328 2 690 183
Total comprehensive income (loss) 5,447 (2,890) 8,527 (9,180)
Other Comprehensive Income (Loss), Tax [Abstract]        
Changes in net unrealized (losses) gains on available-for-sale securities, tax benefit (expense) 46 19 (150) (68)
Reclassification adjustment for other-than-temporary impairments recognized in net income (loss), tax benefit (expense) (210) (15) (232) (28)
Reclassification adjustment for gains included in net income (loss), tax benefit (expense) $ 3 $ 3 $ 6 $ 11