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Fair Value Measurements - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Mar. 31, 2013
Residential Mortgage Loans
Dec. 31, 2012
Residential Mortgage Loans
Mar. 31, 2013
Other Real Estate Owned
Mar. 31, 2012
Other Real Estate Owned
Mar. 31, 2013
Commercial Loans HFS transferred from portfolio in the current quarter
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis                
Net fair value of the interest rate lock commitments $ 50              
Increases in the fair value of the interest rate lock commitments, due to decrease in current interest rates of 25 bp 37              
Increases in the fair value of the interest rate lock commitments, due to decrease in current interest rates of 50 bp 68              
Decreases in the fair value of the interest rate lock commitments, due to increase in current interest rates of 25 bp 42              
Decreases in the fair value of the interest rate lock commitments, due to increase in current interest rates of 50 bp 86              
Decrease in fair value of interest rate lock commitments, due to 10% adverse changes in the assumed loan closing rates 5              
Decrease in fair value of interest rate lock commitments, due to 20% adverse changes in the assumed loan closing rates 10              
Increase in fair value of interest rate lock commitments, due to 10% favorable changes in the assumed loan closing rates 5              
Increase in fair value of interest rate lock commitments, due to 20% favorable changes in the assumed loan closing rates 10              
Commercial loans transferred from the portfolio to loans held for sale 590 17           3
Existing loans held for sale, further adjusted 2,560   2,856         1
Net impact related to fair value adjustments           10 17 3
Fair value changes included in earnings for instruments for which the fair value option was elected 114 109            
The fair value of loans       3 3      
Nonrecurring Losses Included As Charge-Offs           12 6  
Incremental Unit Purchase Option 20              
Fair Value Changes Included In Earnings For Instruments No Longer Held $ 72 $ 188