Summary of Loans Modified in a TDR (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended		3 Months Ended		9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013 Quarterly		Sep. 30, 2012 Quarterly		Sep. 30, 2013 Commercial Portfolio Segment Commercial and Industrial Loans		Sep. 30, 2012 Commercial Portfolio Segment Commercial and Industrial Loans		Sep. 30, 2013 Commercial Portfolio Segment Commercial and Industrial Loans Quarterly		Sep. 30, 2012 Commercial Portfolio Segment Commercial and Industrial Loans Quarterly		Sep. 30, 2013 Commercial Portfolio Segment Commercial Mortgage Loans, Owner Occupied		Sep. 30, 2012 Commercial Portfolio Segment Commercial Mortgage Loans, Owner Occupied		Sep. 30, 2013 Commercial Portfolio Segment Commercial Mortgage Loans, Owner Occupied Quarterly		Sep. 30, 2012 Commercial Portfolio Segment Commercial Mortgage Loans, Owner Occupied Quarterly		Sep. 30, 2013 Commercial Portfolio Segment Commercial Mortgage Loans, Non Owner Occupied		Sep. 30, 2012 Commercial Portfolio Segment Commercial Mortgage Loans, Non Owner Occupied		Sep. 30, 2013 Commercial Portfolio Segment Commercial Mortgage Loans, Non Owner Occupied Quarterly		Sep. 30, 2012 Commercial Portfolio Segment Commercial Mortgage Loans, Non Owner Occupied Quarterly		Sep. 30, 2013 Commercial Portfolio Segment Commercial Construction		Sep. 30, 2012 Commercial Portfolio Segment Commercial Construction		Sep. 30, 2013 Commercial Portfolio Segment Commercial Construction Quarterly		Sep. 30, 2012 Commercial Portfolio Segment Commercial Construction Quarterly		Sep. 30, 2012 Commercial Portfolio Segment Commercial Leases		Sep. 30, 2012 Commercial Portfolio Segment Commercial Leases Quarterly		Sep. 30, 2013 Residential Mortgage Loans		Sep. 30, 2012 Residential Mortgage Loans		Sep. 30, 2013 Residential Mortgage Loans Quarterly		Sep. 30, 2012 Residential Mortgage Loans Quarterly		Sep. 30, 2013 Consumer Portfolio Segment Home Equity		Sep. 30, 2012 Consumer Portfolio Segment Home Equity		Sep. 30, 2013 Consumer Portfolio Segment Home Equity Quarterly		Sep. 30, 2012 Consumer Portfolio Segment Home Equity Quarterly		Sep. 30, 2013 Consumer Portfolio Segment Automobile Loans		Sep. 30, 2012 Consumer Portfolio Segment Automobile Loans		Sep. 30, 2013 Consumer Portfolio Segment Automobile Loans Quarterly		Sep. 30, 2012 Consumer Portfolio Segment Automobile Loans Quarterly		Sep. 30, 2013 Consumer Portfolio Segment Credit Card		Sep. 30, 2012 Consumer Portfolio Segment Credit Card		Sep. 30, 2013 Consumer Portfolio Segment Credit Card Quarterly		Sep. 30, 2012 Consumer Portfolio Segment Credit Card Quarterly
Financing Receivable, Modifications
Number of Loans Modified in a TDR During the Period	8,920	[1],[2]	11,498	[1],[2]	2,739	[1],[2]	3,370	[1],[2]	119	[1],[2]	61	[1],[2]	56	[1],[2]	20	[1],[2]	56	[1],[2],[3]	52	[1],[2]	32	[1],[2]	16	[1],[2]	50	[1],[2]	52	[1],[2]	16	[1],[2]	12	[1],[2]	3	[1],[2]	14	[1],[2]	1	[1],[2]	3	[1],[2]	6	[1],[2]	6	[1],[2]	1,266	[1],[2]	1,542	[1],[2]	452	[1],[2]	505	[1],[2]	621	[1],[2]	1,034	[1],[2]	117	[1],[2]	364	[1],[2]	363	[1],[2]	774	[1],[2]	115	[1],[2]	213	[1],[2]	6,442	[1],[2]	7,963	[1],[2]	1,950	[1],[2]	2,231	[1],[2]
Recorded Investment in Loans Modified in a TDR During the Period	$ 575	[1]	$ 592	[1]	$ 191	[1]	$ 190	[1]	$ 201	[1]	$ 45	[1]	$ 79	[1]	$ 20	[1]	$ 16	[1],[3]	$ 45	[1]	$ 7	[1]	$ 29	[1]	$ 65	[1]	$ 78	[1]	$ 11	[1]	$ 11	[1]	$ 16	[1]	$ 36	[1]	$ 9	[1]			$ 3	[1]	$ 3	[1]	$ 194	[1]	$ 259	[1]	$ 65	[1]	$ 90	[1]	$ 33	[1]	$ 63	[1]	$ 6	[1]	$ 21	[1]	$ 11	[1]	$ 12	[1]	$ 2	[1]	$ 3	[1]	$ 39	[1]	$ 51	[1]	$ 12	[1]	$ 13	[1]
Increase (Decrease) to ALLL Upon Modification	8	[1]	6	[1]	(5)	[1]	4	[1]	(13)	[1]	(10)	[1]	(13)	[1]			(1)	[1],[3]	(6)	[1]			(3)	[1]	(7)	[1]	(8)	[1]	(2)	[1]	(3)	[1]	(1)	[1]	(4)	[1]									24	[1]	22	[1]	8	[1]	7	[1]			3	[1]			1	[1]	1	[1]	2	[1]					5	[1]	7	[1]	2	[1]	2	[1]
Charge-offs Recognized Upon Modification	$ 1	[1]	$ 7	[1]			$ 7	[1]	$ 1	[1]	$ 5	[1]			$ 5	[1]			$ 2	[1]			$ 2	[1]

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

[2] Represents number of loans post-modification.

[3] Excludes five loans modified in a TDR during the nine months ended September 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.