Summary of Loans Modified in a TDR (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Financing Receivable, Modifications [Line Items]
Number of Loans Modified in a TDR During the Period	11,102	[1],[2]	11,291	[1],[2]	16,064	[1],[2]
Recorded Investment in Loans Modified in a TDR During the Period	$ 548	[1]	$ 1,081	[1]	$ 793	[1]
Increase (Decrease) to ALLL Upon Modification	27	[1]	58	[1]	24	[1]
Charge-offs Recognized Upon Modification	8	[1]	44	[1]	11	[1]
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications [Line Items]
Number of Loans Modified in a TDR During the Period	128	[1],[2]	146	[1],[2]	108	[1],[2]
Recorded Investment in Loans Modified in a TDR During the Period	230	[1]	604	[1]	84	[1]
Increase (Decrease) to ALLL Upon Modification	12	[1]	39	[1]	(7)	[1]
Charge-offs Recognized Upon Modification	6	[1]	44	[1]	9	[1]
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner Occupied
Financing Receivable, Modifications [Line Items]
Number of Loans Modified in a TDR During the Period	32	[1],[2]	65	[1],[2],[3]	67	[1],[2]
Recorded Investment in Loans Modified in a TDR During the Period	54	[1]	19	[1],[3]	53	[1]
Increase (Decrease) to ALLL Upon Modification	(1)	[1]	(2)	[1],[3]	(8)	[1]
Charge-offs Recognized Upon Modification					2	[1]
Commercial Portfolio Segment | Commercial Mortgage Loans, Non Owner Occupied
Financing Receivable, Modifications [Line Items]
Number of Loans Modified in a TDR During the Period	28	[1],[2]	59	[1],[2]	67	[1],[2]
Recorded Investment in Loans Modified in a TDR During the Period	30	[1]	72	[1]	91	[1]
Increase (Decrease) to ALLL Upon Modification	(3)	[1]	(7)	[1]	(7)	[1]
Charge-offs Recognized Upon Modification	2	[1]
Commercial Portfolio Segment | Commercial Construction
Financing Receivable, Modifications [Line Items]
Number of Loans Modified in a TDR During the Period			4	[1],[2]	17	[1],[2]
Recorded Investment in Loans Modified in a TDR During the Period			34	[1]	38	[1]
Increase (Decrease) to ALLL Upon Modification			(2)	[1]	(4)	[1]
Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Modifications [Line Items]
Number of Loans Modified in a TDR During the Period			1	[1],[2]	8	[1],[2]
Recorded Investment in Loans Modified in a TDR During the Period			2	[1]	7	[1]
Increase (Decrease) to ALLL Upon Modification			(5)	[1]	1	[1]
Residential Mortgage Loans
Financing Receivable, Modifications [Line Items]
Number of Loans Modified in a TDR During the Period	1,093	[1],[2]	1,620	[1],[2]	1,758	[1],[2]
Recorded Investment in Loans Modified in a TDR During the Period	160	[1]	249	[1]	340	[1]
Increase (Decrease) to ALLL Upon Modification	8	[1]	28	[1]	35	[1]
Consumer Portfolio Segment | Home Equity
Financing Receivable, Modifications [Line Items]
Number of Loans Modified in a TDR During the Period	284	[1],[2]	695	[1],[2]	1,343	[1],[2]
Recorded Investment in Loans Modified in a TDR During the Period	12	[1]	37	[1]	82	[1]
Increase (Decrease) to ALLL Upon Modification			(1)	[1]	1	[1]
Consumer Portfolio Segment | Automobile Loans
Financing Receivable, Modifications [Line Items]
Number of Loans Modified in a TDR During the Period	608	[1],[2]	499	[1],[2]	1,289	[1],[2]
Recorded Investment in Loans Modified in a TDR During the Period	10	[1]	14	[1]	23	[1]
Increase (Decrease) to ALLL Upon Modification	1	[1]	1	[1]	2	[1]
Consumer Portfolio Segment | Credit Card
Financing Receivable, Modifications [Line Items]
Number of Loans Modified in a TDR During the Period	8,929	[1],[2]	8,202	[1],[2]	11,407	[1],[2]
Recorded Investment in Loans Modified in a TDR During the Period	52	[1]	50	[1]	75	[1]
Increase (Decrease) to ALLL Upon Modification	$ 10	[1]	$ 7	[1]	$ 11	[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 year ended December 31, 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 at modification, ALLL increased $7 upon modification, and a charge-off of $2 was recognized upon modification.