Summary of Loans Modified in a TDR (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended				3 Months Ended				6 Months Ended				3 Months Ended				6 Months Ended				3 Months Ended				6 Months Ended				3 Months Ended				6 Months Ended		3 Months Ended		6 Months Ended				3 Months Ended				6 Months Ended				3 Months Ended				6 Months Ended				3 Months Ended				6 Months Ended				3 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014 Quarterly		Jun. 30, 2013 Quarterly		Jun. 30, 2014 Commercial Portfolio Segment Commercial and Industrial Loans		Jun. 30, 2013 Commercial Portfolio Segment Commercial and Industrial Loans		Jun. 30, 2014 Commercial Portfolio Segment Commercial and Industrial Loans Quarterly		Jun. 30, 2013 Commercial Portfolio Segment Commercial and Industrial Loans Quarterly		Jun. 30, 2014 Commercial Portfolio Segment Commercial Mortgage Loans, Owner Occupied		Jun. 30, 2013 Commercial Portfolio Segment Commercial Mortgage Loans, Owner Occupied		Jun. 30, 2014 Commercial Portfolio Segment Commercial Mortgage Loans, Owner Occupied Quarterly		Jun. 30, 2013 Commercial Portfolio Segment Commercial Mortgage Loans, Owner Occupied Quarterly		Jun. 30, 2014 Commercial Portfolio Segment Commercial Mortgage Loans, Non Owner Occupied		Jun. 30, 2013 Commercial Portfolio Segment Commercial Mortgage Loans, Non Owner Occupied		Jun. 30, 2014 Commercial Portfolio Segment Commercial Mortgage Loans, Non Owner Occupied Quarterly		Jun. 30, 2013 Commercial Portfolio Segment Commercial Mortgage Loans, Non Owner Occupied Quarterly		Jun. 30, 2013 Commercial Portfolio Segment Commercial Construction		Jun. 30, 2013 Commercial Portfolio Segment Commercial Construction Quarterly		Jun. 30, 2014 Residential Mortgage Loans		Jun. 30, 2013 Residential Mortgage Loans		Jun. 30, 2014 Residential Mortgage Loans Quarterly		Jun. 30, 2013 Residential Mortgage Loans Quarterly		Jun. 30, 2014 Consumer Portfolio Segment Home Equity		Jun. 30, 2013 Consumer Portfolio Segment Home Equity		Jun. 30, 2014 Consumer Portfolio Segment Home Equity Quarterly		Jun. 30, 2013 Consumer Portfolio Segment Home Equity Quarterly		Jun. 30, 2014 Consumer Portfolio Segment Automobile Loans		Jun. 30, 2013 Consumer Portfolio Segment Automobile Loans		Jun. 30, 2014 Consumer Portfolio Segment Automobile Loans Quarterly		Jun. 30, 2013 Consumer Portfolio Segment Automobile Loans Quarterly		Jun. 30, 2014 Consumer Portfolio Segment Credit Card		Jun. 30, 2013 Consumer Portfolio Segment Credit Card		Jun. 30, 2014 Consumer Portfolio Segment Credit Card Quarterly		Jun. 30, 2013 Consumer Portfolio Segment Credit Card Quarterly
Financing Receivable, Modifications
Number of Loans Modified in a TDR During the Period	4,698	[1],[2]	6,181	[1],[2]	2,241	[1],[2]	2,988	[1],[2]	66	[1],[2]	63	[1],[2]	44	[1],[2]	43	[1],[2]	20	[1],[2]	24	[1],[2],[3]	4	[1],[2]	14	[1],[2]	11	[1],[2]	34	[1],[2]	4	[1],[2]	19	[1],[2]	2	[1],[2]	1	[1],[2]	572	[1],[2]	814	[1],[2]	262	[1],[2]	420	[1],[2]	106	[1],[2]	504	[1],[2]	71	[1],[2]	178	[1],[2]	259	[1],[2]	248	[1],[2]	143	[1],[2]	133	[1],[2]	3,664	[1],[2]	4,492	[1],[2]	1,713	[1],[2]	2,180	[1],[2]
Recorded Investment in Loans Modified in a TDR During the Period	$ 292	[1]	$ 384	[1]	$ 195	[1],[2]	$ 250	[1],[2]	$ 119	[1]	$ 121	[1]	$ 100	[1],[2]	$ 112	[1],[2]	$ 51	[1]	$ 9	[1],[3]	$ 39	[1],[2]	$ 5	[1],[2]	$ 7	[1]	$ 54	[1]	$ 1	[1],[2]	$ 37	[1],[2]	$ 7	[1]	$ 1	[1],[2]	$ 84	[1]	$ 129	[1]	$ 39	[1],[2]	$ 68	[1],[2]	$ 4	[1]	$ 27	[1]	$ 3	[1],[2]	$ 11	[1],[2]	$ 4	[1]	$ 9	[1]	$ 2	[1],[2]	$ 3	[1],[2]	$ 23	[1]	$ 28	[1]	$ 11	[1],[2]	$ 13	[1],[2]
Increase (Decrease) to ALLL Upon Modification	9	[1]	14	[1]	10	[1],[2]	6	[1],[2]	2	[1]			6	[1],[2]	(1)	[1],[2]	(1)	[1]	(1)	[1],[3]					(1)	[1]	(5)	[1]			(3)	[1],[2]	(1)	[1]			5	[1]	16	[1]	2	[1],[2]	8	[1],[2]							(1)	[1],[2]			1	[1]			1	[1],[2]	4	[1]	4	[1]	2	[1],[2]	2	[1],[2]
Charge-offs Recognized Upon Modification			$ 1	[1]							$ 1	[1]

[1] Excludes all loans and leases held for sale and loans acquired with deteriorated credit quality which were accounted for within a pool.

[2] Represents number of loans post-modification.

[3] Excludes five loans modified in a TDR during the six months ended June 30, 2013 associated with a consolidated VIE in which the Bancorp has no continuing credit risk due to the risk being assumed by a third party. The TDR had a recorded investment of $29, ALLL increased $7 upon modification, and a charge-off of $2 was recognized upon modification.