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Investments in Securities Other-than-temporary Impairments 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
Schedule of Available-for-sale Securities [Line Items]        
Net other-than-temporary impairments $ 599 $ 56 $ 663 $ 100
Alt-A private-label securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Net other-than-temporary impairments 312 53 355 91
Subprime private-label securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Net other-than-temporary impairments 284 0 303 0
Other mortgage-related securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Net other-than-temporary impairments $ 3 $ 3 $ 5 $ 9