Fair Value Measurements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended				9 Months Ended	12 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Jun. 30, 2009	Sep. 30, 2013 Residential Mortgage Loans	Dec. 31, 2012 Residential Mortgage Loans	Sep. 30, 2013 Interest Rate Lock Commitments	Sep. 30, 2013 Fair Value Option	Sep. 30, 2012 Fair Value Option	Sep. 30, 2013 Fair Value Option	Sep. 30, 2012 Fair Value Option	Sep. 30, 2013 Other Real Estate Owned	Sep. 30, 2012 Other Real Estate Owned	Sep. 30, 2013 Other Real Estate Owned	Sep. 30, 2012 Other Real Estate Owned	Sep. 30, 2013 Commercial Loans Held For Sale	Sep. 30, 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							$ 24
Change in the fair value of the interest rate lock commitments, due to decrease in current interest rates of 25 bp							10
Change in the fair value of the interest rate lock commitments, due to decrease in current interest rates of 50 bp							19
Change in the fair value of the interest rate lock commitments, due to increase in current interest rates of 25 bp							12
Change in the fair value of the interest rate lock commitments, due to increase in current interest rates of 50 bp							25
Change in fair value of interest rate lock commitments, due to 10% adverse changes in the assumed loan closing rates							2
Change in fair value of interest rate lock commitments, due to 20% adverse changes in the assumed loan closing rates							5
Change in fair value of interest rate lock commitments, due to 10% favorable changes in the assumed loan closing rates							2
Change in fair value of interest rate lock commitments, due to 20% favorable changes in the assumed loan closing rates							5
Commercial loans transferred from the portfolio to loans held for sale	603	29															5
Existing loans held for sale, further adjusted	1,298		2,856													4
Net impact related to fair value adjustments												5	12	20	47
Fair value changes included in earnings for instruments for which the fair value option was elected								56	122	56	122
The fair value of loans					3	3										1
Nonrecurring Losses Included As Charge-Offs												3	4	17	13
Incremental Unit Purchase Option	20
Fair Value Changes Included In Earnings For Instruments No Longer Held								$ 110	$ 138	$ 406	$ 556
Percentage of Vantiv Holding, LLC sold to Advent for cash and warrants				51.00%