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Derivatives, Net Gains (Losses) related to Cash Flow Hedges (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Net Gains Losses Recognized Related to Derivatives in Cash Flow Hedging Relationships [Abstract]      
Gains (losses) (after tax) recognized in OCI on derivatives (effective portion) $ 105 $ 468 $ 107
Gains (pre tax) reclassified from cumulative OCI into net interest income (effective portion) 571 613  
Gains (losses) (pre tax) recognized in noninterest income on derivatives (ineffective portion) $ (5) $ 6