Fair Value Measurements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended				6 Months Ended	12 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2009	Jun. 30, 2014 Residential Mortgage Loans	Dec. 31, 2013 Residential Mortgage Loans	Jun. 30, 2014 Interest Rate Lock Commitments	Jun. 30, 2014 Other Real Estate Owned	Jun. 30, 2013 Other Real Estate Owned	Jun. 30, 2014 Other Real Estate Owned	Jun. 30, 2013 Other Real Estate Owned	Jun. 30, 2014 Commercial Loans Held For Sale	Jun. 30, 2013 Commercial Loans Held For Sale	Jun. 30, 2014 Commercial Loans Held For Sale	Jun. 30, 2013 Commercial Loans Held For Sale	Jun. 30, 2014 Commercial Loans HFS transferred from portfolio in the current quarter	Jun. 30, 2013 Commercial Loans HFS transferred from portfolio in the current quarter	Jun. 30, 2014 Commercial Loans HFS transferred from portfolio in the current quarter	Jun. 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								$ 17
Change in the fair value of the interest rate lock commitments, due to decrease in current interest rates of 25 bp								7
Change in the fair value of the interest rate lock commitments, due to decrease in current interest rates of 50 bp								14
Change in the fair value of the interest rate lock commitments, due to increase in current interest rates of 25 bp								8
Change in the fair value of the interest rate lock commitments, due to increase in current interest rates of 50 bp								16
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								3
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								3
Commercial loans transferred from the portfolio to loans held for sale		96	601														1	2	1	5
Existing loans held for sale, further adjusted	598	598		890
Net impact related to fair value adjustments									3	5	13	14	1	1	1	1			1	4
Fair value changes included in earnings for instruments for which the fair value option was elected	29	29
The fair value of loans						2	2
Nonrecurring Losses Included As Charge-Offs									$ 3	$ 2	$ 6	$ 15
Incremental Unit Purchase Option	20	20
Percentage of Vantiv Holding, LLC sold to Advent for cash and warrants					51.00%