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Fair Value Measurements (Details 5) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Loans held-for-sale $ 15,143   $ 15,143   $ 25,942
Gains (Losses) on loans held-for-sale (12) 307 52 123  
Gains (Losses) on loans and leases (1,679) (1,736) (3,097) (3,921)  
Gains (Losses) on Foreclosed Properties (75) (59) (147) (113)  
Other Assets 66,153   66,153   70,531
Gains (Losses) on other assets (19) (3) (23) (3)  
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]
         
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Loans held-for-sale 1,049 1,501 1,049 1,501  
Loans and Leases 17 45 17 45  
Foreclosed properties 0 10 0 10  
Other Assets 0 4 0 4  
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]
         
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis          
Loans held-for-sale 1,779 8,070 1,779 8,070  
Loans and Leases 9,437 10,817 9,437 10,817  
Foreclosed properties 2,405 1,251 2,405 1,251  
Other Assets $ 96 $ 16 $ 96 $ 16