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Fair Value Measurements - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Jun. 30, 2012
Residential Mortgage Loans
Jun. 30, 2011
Residential Mortgage Loans
Dec. 31, 2011
Residential Mortgage Loans
Jun. 30, 2012
Other Real Estate Owned [Member]
Jun. 30, 2012
Other Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Net fair value of the interest rate lock commitments $ 54   $ 54              
Increases in the fair value of the interest rate lock commitments, due to decrease in current interest rates of 25 bp 18   18              
Increases in the fair value of the interest rate lock commitments, due to decrease in current interest rates of 50 bp 32   32              
Decreases in the fair value of the interest rate lock commitments, due to increase in current interest rates of 25 bp 22   22              
Decreases in the fair value of the interest rate lock commitments, due to increase in current interest rates of 50 bp 51   51              
Decrease in fair value of interest rate lock commitments, due to 10% adverse changes in the assumed loan closing rates 6   6              
Decrease in fair value of interest rate lock commitments, due to 20% adverse changes in the assumed loan closing rates 11   11              
Increase in fair value of interest rate lock commitments, due to 10% favorable changes in the assumed loan closing rates 6   6              
Increase in fair value of interest rate lock commitments, due to 20% favorable changes in the assumed loan closing rates 11   11              
Commercial loans transferred from the portfolio to loans held for sale 3   20 58            
Existing loans held for sale, further adjusted 1,788 978 1,788 978 2,751          
Residential loans transferred to the Bancorp's portfolio     68 16            
Net impact related to fair value adjustments 5   6           19 36
Fair value changes included in earnings for instruments for which the fair value option was elected 97 35 97              
The fair value of loans           3 4 3    
Nonrecurring Losses Included As Charge-Offs     9           3  
Fair Value Changes Included In Earnings For Instruments No Longer Held $ 109 $ 41 $ 267 $ 73