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Fair Value Changes in FV under the FV Option (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Fair Value, Option, Quantitative Disclosures [Line Items]    
Changes in instrument-specific credit risk $ (42) $ (70)
Other changes in fair value 7 (91)
Fair value (losses) gains, net (35) (161)
Loans [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Changes in instrument-specific credit risk - Loans 9 (65)
Other changes in fair value 123 (157)
Fair value (losses) gains, net 132 (222)
Long-term Debt [Member]
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Changes in instrument-specific credit risk - Long-Term Debt (51) (5)
Other changes in fair value (116) 66
Fair value (losses) gains, net $ (167) $ 61