Fair Values of Assets and Liabilities (Significant Unobservable Level 3 Inputs) (Detail) (Fair Value, Inputs, Level 3, USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013
Commercial Loans Held For Sale | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Fair value measurements nonrecurring assets	$ 45		$ 2
Commercial and Industrial Loans | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Default rates			100.00%
Fair value measurements nonrecurring assets	62		83
Commercial Mortgage Loans | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Default rates			100.00%
Fair value measurements nonrecurring assets	76		35
Commercial Construction Loans | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Default rates			100.00%
Fair value measurements nonrecurring assets	2		8
Servicing Rights | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Fair value measurements nonrecurring assets	928		894
OREO Property | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Fair value measurements nonrecurring assets	124		112
Bank premises and equipment | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Fair value measurements nonrecurring assets	15
Residential mortgage loans | Fair value, recurring
Quantitative information about level 3 fair value measurements
Residential mortgage loans	99		83
IRLCs, net | Fair value, recurring
Quantitative information about level 3 fair value measurements
Derivative instruments	17		(28)
Stock warrants associated with Vantiv Holding, LLC | Fair value, recurring
Quantitative information about level 3 fair value measurements
Derivative instruments	412		287
Swap associated with the sale of Visa, Inc. Class B shares | Fair value, recurring
Quantitative information about level 3 fair value measurements
Derivative instruments	(54)		(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	(16.60%)		(22.10%)
Credit risk factor	0.00%		0.00%
Minimum | IRLCs, net | Fair value, recurring
Quantitative information about level 3 fair value measurements
Loan closing rates	16.50%		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	23.80%	[1]	23.80%	[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	2015-06-30		2014-03-31
Proportional share of covered litigation loss in excess of escrow funds	1
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	19.50%		45.60%
Credit risk factor	62.40%		67.00%
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		16 years
Expected volatility	32.30%	[1]	34.70%	[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
Proportional share of covered litigation loss in excess of escrow funds	19
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	4.60%		3.80%
Credit risk factor	2.10%		3.30%
Weighted average | IRLCs, net | Fair value, recurring
Quantitative information about level 3 fair value measurements
Loan closing rates	62.70%		63.00%
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	27.30%	[1]	28.90%	[1]
Weighted average | Swap associated with the sale of Visa, Inc. Class B shares | Fair value, recurring
Quantitative information about level 3 fair value measurements
Proportional share of covered litigation loss in excess of escrow funds	$ 18
Fixed | Servicing Rights | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Prepayment speed	11.10%		11.80%
Discount rate	9.90%		10.40%
Adjustable | Servicing Rights | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Prepayment speed	26.50%		25.90%
Discount rate	11.80%		11.60%

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