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Changes in the Carrying Amounts of Other Intangible Assets (Detail) (USD $)
In Millions
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Beginning Balance$ 1,571$ 1,711
Designated at fair value (transfers from amortized cost) 0
Amortization(34)(39)
MSRs originated183198
Sale of MSRs(7) 
Due to fair value election 145
Changes in fair value:  
Due to changes in inputs or assumptions(443)(643)
Other changes in fair value(139)(168)
Other7 
Ending Balance1,1381,204
Core Deposits
  
Beginning Balance67104
Designated at fair value (transfers from amortized cost) 0
Amortization(23)(29)
MSRs originated00
Sale of MSRs0 
Due to fair value election 0
Changes in fair value:  
Due to changes in inputs or assumptions0[1]0[1]
Other changes in fair value0[2]0[2]
Other0 
Ending Balance4475
Mortgage Servicing Rights, Amortized Cost
  
Beginning Balance0604
Designated at fair value (transfers from amortized cost) (604)
Amortization00
MSRs originated00
Sale of MSRs0 
Due to fair value election 0
Changes in fair value:  
Due to changes in inputs or assumptions0[1]0[1]
Other changes in fair value0[2]0[2]
Other0 
Ending Balance00
Mortgage Servicing Rights, Fair Value
  
Beginning Balance1,439936
Designated at fair value (transfers from amortized cost) 604
Amortization00
MSRs originated183198
Sale of MSRs(7) 
Due to fair value election 145
Changes in fair value:  
Due to changes in inputs or assumptions(443)[1](643)[1]
Other changes in fair value(139)[2](168)[2]
Other0 
Ending Balance1,0331,072
Other Intangible Assets
  
Beginning Balance6567
Designated at fair value (transfers from amortized cost) 0
Amortization(11)(10)
MSRs originated00
Sale of MSRs0 
Due to fair value election 0
Changes in fair value:  
Due to changes in inputs or assumptions0[1]0[1]
Other changes in fair value0[2]0[2]
Other7 
Ending Balance$ 61$ 57
[1]Primarily reflects changes in discount rates and prepayment speed assumptions, due to changes in interest rates.
[2]Represents changes due to the collection of expected cash flows, net of accretion, due to the passage of time.