Fair Values of Assets and Liabilities (Significant Unobservable Level 3 Inputs) (Detail) (Fair Value, Inputs, Level 3, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Commercial Loans Held For Sale | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Fair value measurements nonrecurring assets	$ 3		$ 9
Commercial and Industrial Loans | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Default rates			100.00%
Fair value measurements nonrecurring assets	443		83
Commercial Mortgage Loans | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Default rates			100.00%
Fair value measurements nonrecurring assets	61		46
Commercial Construction Loans | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Default rates			100.00%
Fair value measurements nonrecurring assets	16		4
Servicing Rights | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Fair value measurements nonrecurring assets	967		697
OREO Property | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Fair value measurements nonrecurring assets	87		165
Private equity investment funds | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Fair value measurements nonrecurring assets	44	[1]
Residential mortgage loans | Fair value, recurring
Quantitative information about level 3 fair value measurements
Residential mortgage loans	92		76
IRLCs, net | Fair value, recurring
Quantitative information about level 3 fair value measurements
Derivative instruments	11		60
Stock warrants associated with Vantiv Holding, LLC | Fair value, recurring
Quantitative information about level 3 fair value measurements
Derivative instruments	384		177
Swap associated with the sale of Visa, Inc. Class B shares | Fair value, recurring
Quantitative information about level 3 fair value measurements
Derivative instruments	$ (48)		$ (33)
Minimum | Servicing Rights | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Discount rate	9.40%		9.40%
Minimum | Residential mortgage loans | Fair value, recurring
Quantitative information about level 3 fair value measurements
Interest rate risk factor	(23.70%)		(91.20%)
Minimum | IRLCs, net | Fair value, recurring
Quantitative information about level 3 fair value measurements
Loan closing rates	14.90%		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	18.50%	[2]	27.20%	[2]
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		2013-12-31
Maximum | Servicing Rights | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Prepayment speed	100.00%		100.00%
Discount rate	18.00%		18.00%
Maximum | Private equity investment funds | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Liquidity inputs	18.00%
Maximum | Residential mortgage loans | Fair value, recurring
Quantitative information about level 3 fair value measurements
Interest rate risk factor	16.50%		17.00%
Credit risk factor	63.40%		68.40%
Maximum | IRLCs, net | Fair value, recurring
Quantitative information about level 3 fair value measurements
Loan closing rates	98.70%		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 6 months		16 years 6 months
Expected volatility	33.20%	[2]	40.00%	[2]
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		2016-12-31
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 | Private equity investment funds | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Liquidity inputs	3.00%
Weighted average | Residential mortgage loans | Fair value, recurring
Quantitative information about level 3 fair value measurements
Interest rate risk factor	2.30%		5.80%
Credit risk factor	2.60%		4.30%
Weighted average | IRLCs, net | Fair value, recurring
Quantitative information about level 3 fair value measurements
Loan closing rates	68.50%		58.30%
Weighted average | Stock warrants associated with Vantiv Holding, LLC | Fair value, recurring
Quantitative information about level 3 fair value measurements
Expected term (years)	5 years 1 month 6 days		6 years 2 months 12 days
Expected volatility	25.40%	[2]	33.80%	[2]
Fixed Rate | Servicing Rights | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Prepayment speed	10.30%		16.10%
Discount rate	10.40%		10.50%
Adjustable | Servicing Rights | Fair value, nonrecurring
Quantitative information about level 3 fair value measurements
Prepayment speed	25.60%		26.90%
Discount rate	11.60%		11.70%

[1] Includes funds the Bancorp will be prohibited from retaining after the July 21, 2015 end of the conformance period for the final rules, adopted under the Bank Holding Company Act, that implemented the provision of the Dodd-Frank Wall Street Reform and Consumer Protection Act, commonly referred to as the Volcker Rule.

[2] Based on historical and implied volatilities of comparable companies assuming similar expected terms.