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Loans and Allowance for Credit Losses, PCI, Accretable Yield (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Change in accretable yield related to PCI loans [Abstract]        
Total, beginning of year $ 15,961 $ 16,714 $ 14,559 $ 10,447
Addition of accretable yield due to acquisitions 3 128 0 0
Accretion into interest income (2,152) (2,206) (2,392) (2,601)
Accretion into noninterest income due to sales (5) (189) (43) (5)
Reclassification from nonaccretable difference for loans with improving credit-related cash flows 1,141 373 3,399 441
Changes in expected cash flows that do not affect nonaccretable difference 3,600 1,141 1,191 6,277
Total, end of year $ 18,548 $ 15,961 $ 16,714 $ 14,559