Fair Values of Assets and Liabilities (Significant Unobservable Level 3 Inputs) (Detail) (Fair Value, Inputs, Level 3, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Commercial Loans Held For Sale | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Fair value measurements nonrecurring assets			$ 4
Commercial and Industrial Loans | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Fair value measurements nonrecurring assets	22		20
Commercial Mortgage Loans | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Fair value measurements nonrecurring assets	31		34
Commercial Construction Loans | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Fair value measurements nonrecurring assets	2		7
Servicing Rights | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Fair value measurements nonrecurring assets	972		766
OREO Property | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Fair value measurements nonrecurring assets	95		120
Residential mortgage loans | Fair value, recurring
Quantitative information about level 3 fair value measurements
Residential mortgage loans	103		81
IRLCs, net | Fair value, recurring
Quantitative information about level 3 fair value measurements
Derivative instruments	16		50
Stock warrants associated with Vantiv Holding, LLC | Fair value, recurring
Quantitative information about level 3 fair value measurements
Derivative instruments	348		211
Swap associated with the sale of Visa, Inc. Class B shares | Fair value, recurring
Quantitative information about level 3 fair value measurements
Derivative instruments	$ (43)		$ (37)
Minimum | Servicing Rights | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Prepayment speed	0.00%		0.00%
Discount rate	9.60%		9.40%
Minimum | Residential mortgage loans | Fair value, recurring
Quantitative information about level 3 fair value measurements
Interest rate risk factor	(21.80%)		(91.00%)
Credit risk factor	0.00%		0.00%
Minimum | IRLCs, net | Fair value, recurring
Quantitative information about level 3 fair value measurements
Loan closing rates	7.30%		9.90%
Minimum | Stock warrants associated with Vantiv Holding, LLC | Fair value, recurring
Quantitative information about level 3 fair value measurements
Expected term (years)	2 years		2 years
Expected volatility	25.00%	[1]	23.60%	[1]
Minimum | Swap associated with the sale of Visa, Inc. Class B shares | Fair value, recurring
Quantitative information about level 3 fair value measurements
Timing of the resolution of the covered litigation	2014-12-31		2014-03-31
Maximum | Servicing Rights | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Prepayment speed	100.00%		100.00%
Discount rate	13.20%		18.00%
Maximum | Residential mortgage loans | Fair value, recurring
Quantitative information about level 3 fair value measurements
Interest rate risk factor	20.10%		49.00%
Credit risk factor	62.40%		68.40%
Maximum | IRLCs, net | Fair value, recurring
Quantitative information about level 3 fair value measurements
Loan closing rates	95.00%		95.00%
Maximum | Stock warrants associated with Vantiv Holding, LLC | Fair value, recurring
Quantitative information about level 3 fair value measurements
Expected term (years)	15 years 3 months		16 years 6 months
Expected volatility	32.70%	[1]	35.00%	[1]
Maximum | Swap associated with the sale of Visa, Inc. Class B shares | Fair value, recurring
Quantitative information about level 3 fair value measurements
Timing of the resolution of the covered litigation	2019-12-31		2017-03-31
Weighted average | Commercial Loans Held For Sale | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Cost to sell	10.00%		10.00%
Weighted average | Residential mortgage loans | Fair value, recurring
Quantitative information about level 3 fair value measurements
Interest rate risk factor	3.00%		6.00%
Credit risk factor	2.00%		3.40%
Weighted average | IRLCs, net | Fair value, recurring
Quantitative information about level 3 fair value measurements
Loan closing rates	67.60%		65.80%
Weighted average | Stock warrants associated with Vantiv Holding, LLC | Fair value, recurring
Quantitative information about level 3 fair value measurements
Expected term (years)	6 years		5 years 1 month 6 days
Expected volatility	28.10%	[1]	28.90%	[1]
Fixed | Servicing Rights | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Prepayment speed	10.60%		14.00%
Discount rate	9.90%		10.50%
Adjustable | Servicing Rights | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Prepayment speed	26.10%		26.80%
Discount rate	11.80%		11.70%

[1] Based on historical and implied volatilities of Vantiv, Inc. and comparable companies assuming similar expected terms.