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Fair Value Changes in FV under the FV Option (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Fair Value, Option, Quantitative Disclosures [Line Items]      
Changes in instrument-specific credit risk $ (38) $ (205) $ (67)
Other changes in fair value (200) (13) (59)
Fair value (losses) gains, net (238) (218) (126)
Loans [Member]
     
Fair Value, Option, Quantitative Disclosures [Line Items]      
Changes in instrument-specific credit risk - Loans (25) (215) (58)
Other changes in fair value (124) 79 (73)
Fair value (losses) gains, net (149) (136) (131)
Long-term Debt [Member]
     
Fair Value, Option, Quantitative Disclosures [Line Items]      
Changes in instrument-specific credit risk - Long-Term Debt (13) 10 (9)
Other changes in fair value (76) (92) 14
Fair value (losses) gains, net $ (89) $ (82) $ 5