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Derivative Financial Instruments And Hedging Activities - Narrative (Detail) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 23, 2012
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Derivative Instruments And Hedging Activities [Line Items]            
After-tax (loss) gain benefit in other comprehensive income related to terminated cash flow hedges of loan and debt instruments which amortize into earnings with the recognition of interest payments     $ 110,000,000     $ (31,000,000)
Pre-tax income related to amortization of cash flow hedges of loan and debt instruments 3,000,000 16,000,000     25,000,000  
Pre-tax loss related to amortization of cash flow hedges of loan and debt instruments       1,000,000    
Cash flow hedges, notional amount 11,500,000,000     11,500,000,000    
Terminated hedges outstanding balance 243,000,000     243,000,000    
Cash flow hedge gain reclassified from other comprehensive income into earnings       53,000,000    
Notional amount of interest rate lock commitments 1,100,000,000     1,100,000,000 488,000,000  
Notional amount of forward rate commitments 1,900,000,000     1,900,000,000 1,000,000,000  
Notional amount of forward rate commitments and futures contracts to hedge against mortgage servicing rights 5,500,000,000     5,500,000,000 3,600,000,000  
Net credit risk on all trading and other derivative positions 850,000,000     850,000,000 772,000,000  
Maximum potential future exposure on swap participations 34,000,000     34,000,000    
Additional collateral related to derivative instruments with credit risk 186,000,000     186,000,000    
Net fair value contracts containing credit-related termination liability position 455,000,000     455,000,000    
Posted collateral - contracts containing credit-related termination provisions 581,000,000     581,000,000    
Net fair value contracts not containing credit-related termination liability position 291,000,000     291,000,000    
Posted collateral - contracts that do not contain credit-related termination provisions 281,000,000     281,000,000    
Aggregate fair value of all derivative instruments with credit risk 546,000,000     546,000,000 425,000,000  
Posted collateral related to derivative instruments with credit risk $ 670,000,000     $ 670,000,000 $ 531,000,000  
Minimum [Member]
            
Derivative Instruments And Hedging Activities [Line Items]            
Swap transaction maturity period       2012    
Credit protection have maturities       2012    
Maximum [Member]
            
Derivative Instruments And Hedging Activities [Line Items]            
Swap transaction maturity period         2026  
Credit protection have maturities         2018