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, 2013		Jun. 30, 2012	Jun. 30, 2013 Quarterly		Jun. 30, 2012 Quarterly		Jun. 30, 2013 Commercial Portfolio Segment Commercial and Industrial Loans		Jun. 30, 2012 Commercial Portfolio Segment Commercial and Industrial Loans	Jun. 30, 2013 Commercial Portfolio Segment Commercial and Industrial Loans Quarterly		Jun. 30, 2012 Commercial Portfolio Segment Commercial and Industrial Loans Quarterly		Jun. 30, 2013 Commercial Portfolio Segment Commercial Mortgage Loans, Owner Occupied		Jun. 30, 2012 Commercial Portfolio Segment Commercial Mortgage Loans, Owner Occupied	Jun. 30, 2012 Commercial Portfolio Segment Commercial Mortgage Loans, Owner Occupied Quarterly		Jun. 30, 2013 Commercial Portfolio Segment Commercial Mortgage Loans, Owner Occupied Quarterly		Jun. 30, 2013 Commercial Portfolio Segment Commercial Mortgage Loans, Non Owner Occupied		Jun. 30, 2012 Commercial Portfolio Segment Commercial Mortgage Loans, Non Owner Occupied	Jun. 30, 2013 Commercial Portfolio Segment Commercial Mortgage Loans, Non Owner Occupied Quarterly		Jun. 30, 2012 Commercial Portfolio Segment Commercial Mortgage Loans, Non Owner Occupied Quarterly		Jun. 30, 2013 Commercial Portfolio Segment Commercial Construction		Jun. 30, 2012 Commercial Portfolio Segment Commercial Construction	Jun. 30, 2012 Commercial Portfolio Segment Commercial Construction Quarterly		Jun. 30, 2013 Commercial Portfolio Segment Commercial Construction Quarterly		Jun. 30, 2013 Residential Mortgage Loans		Jun. 30, 2012 Residential Mortgage Loans	Jun. 30, 2013 Residential Mortgage Loans Quarterly		Jun. 30, 2012 Residential Mortgage Loans Quarterly		Jun. 30, 2012 Consumer Portfolio Segment Home Equity	Jun. 30, 2013 Consumer Portfolio Segment Home Equity		Jun. 30, 2013 Consumer Portfolio Segment Home Equity Quarterly		Jun. 30, 2012 Consumer Portfolio Segment Home Equity Quarterly		Jun. 30, 2013 Consumer Portfolio Segment Automobile Loans		Jun. 30, 2012 Consumer Portfolio Segment Automobile Loans	Jun. 30, 2013 Consumer Portfolio Segment Automobile Loans Quarterly		Jun. 30, 2012 Consumer Portfolio Segment Automobile Loans Quarterly		Jun. 30, 2013 Consumer Portfolio Segment Credit Card		Jun. 30, 2012 Consumer Portfolio Segment Credit Card	Jun. 30, 2013 Consumer Portfolio Segment Credit Card Quarterly		Jun. 30, 2012 Consumer Portfolio Segment Credit Card Quarterly
Financing Receivable, Modifications
Number of Loans Modified in a TDR During the Period	6,181	[1]	8,128	2,988	[2],[3]	4,159	[2],[3]	63	[1]	41	43	[2],[3]	11	[2],[3]	24	[1],[4]	36	9	[2],[3]	14	[2],[3],[4]	34	[1]	40	19	[2],[3]	10	[2],[3]	2	[1]	11			1	[2],[3]	814	[1]	1,037	420	[2],[3]	557	[2],[3]	670	504	[1]	178	[2],[3]	359	[2],[3]	248	[1]	561	133	[2],[3]	222	[2],[3]	4,492	[1]	5,732	2,180	[2],[3]	2,991	[2],[3]
Recorded Investment in Loans Modified in a TDR During the Period	$ 384	[1]	$ 401	$ 250	[2]	$ 171	[2]	$ 121	[1]	$ 25	$ 112	[2]	$ 10	[2]	$ 9	[1]	$ 15	$ 7	[2]	$ 5	[2],[4]	$ 54	[1]	$ 67	$ 37	[2]	$ 16	[2]	$ 7	[1]	$ 36			$ 1	[2]	$ 129	[1]	$ 169	$ 68	[2]	$ 91	[2]	$ 42	$ 27	[1]	$ 11	[2]	$ 23	[2]	$ 9	[1]	$ 9	$ 3	[2]	$ 4	[2]	$ 28	[1]	$ 38	$ 13	[2]	$ 20	[2]
Increase (Decrease) to ALLL Upon Modification	14	[1]	3	6	[2]	(4)	[2]			(9)	(1)	[2]	(6)	[2]	(1)	[1]	(3)	(1)	[2]			(5)	[1]	(5)	(3)	[2]	(6)	[2]	(1)	[1]	(4)	(4)	[2]			16	[1]	15	8	[2]	8	[2]	2			(1)	[2]	1	[2]	1	[1]	2	1	[2]	1	[2]	4	[1]	5	2	[2]	3	[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

[2] Excludes all loans and leases held for sale and loans acquired with deteriorated credit quality.

[3] Represents number of loans post-modification.

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