Summary of Loans Modified in a TDR (Detail) (Quarterly, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Financing Receivable, Modifications
Number of Loans Modified in a TDR During the Period	3,193	[1],[2]	3,969	[1],[2]
Recorded Investment in Loans Modified in a TDR During the Period	$ 135	[1]	$ 230	[1]
Increase (Decrease) to ALLL Upon Modification	8	[1]	7	[1]
Charge-offs Recognized Upon Modification	1	[1]
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications
Number of Loans Modified in a TDR During the Period	20	[1],[2]	30	[1],[2]
Recorded Investment in Loans Modified in a TDR During the Period	9	[1]	15	[1]
Increase (Decrease) to ALLL Upon Modification	1	[1]	(3)	[1]
Charge-offs Recognized Upon Modification	1	[1]
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner Occupied
Financing Receivable, Modifications
Number of Loans Modified in a TDR During the Period	10	[1],[2],[3]	27	[1],[2]
Recorded Investment in Loans Modified in a TDR During the Period	4	[1],[3]	8	[1]
Increase (Decrease) to ALLL Upon Modification	(1)	[1],[3]	(2)	[1]
Commercial Portfolio Segment | Commercial Mortgage Loans, Non Owner Occupied
Financing Receivable, Modifications
Number of Loans Modified in a TDR During the Period	15	[1],[2]	30	[1],[2]
Recorded Investment in Loans Modified in a TDR During the Period	17	[1]	51	[1]
Increase (Decrease) to ALLL Upon Modification	(1)	[1]	1	[1]
Commercial Portfolio Segment | Commercial Construction
Financing Receivable, Modifications
Number of Loans Modified in a TDR During the Period	1	[1],[2]	11	[1],[2]
Recorded Investment in Loans Modified in a TDR During the Period	6	[1]	36	[1]
Increase (Decrease) to ALLL Upon Modification	(1)	[1]
Residential Mortgage Loans
Financing Receivable, Modifications
Number of Loans Modified in a TDR During the Period	394	[1],[2]	480	[1],[2]
Recorded Investment in Loans Modified in a TDR During the Period	61	[1]	78	[1]
Increase (Decrease) to ALLL Upon Modification	8	[1]	7	[1]
Consumer Portfolio Segment | Home Equity
Financing Receivable, Modifications
Number of Loans Modified in a TDR During the Period	326	[1],[2]	311	[1],[2]
Recorded Investment in Loans Modified in a TDR During the Period	17	[1]	19	[1]
Increase (Decrease) to ALLL Upon Modification			1	[1]
Consumer Portfolio Segment | Automobile Loans
Financing Receivable, Modifications
Number of Loans Modified in a TDR During the Period	115	[1],[2]	339	[1],[2]
Recorded Investment in Loans Modified in a TDR During the Period	7	[1]	5	[1]
Increase (Decrease) to ALLL Upon Modification			1	[1]
Consumer Portfolio Segment | Credit Card
Financing Receivable, Modifications
Number of Loans Modified in a TDR During the Period	2,312	[1],[2]	2,741	[1],[2]
Recorded Investment in Loans Modified in a TDR During the Period	14	[1]	18	[1]
Increase (Decrease) to ALLL Upon Modification	$ 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 three months ended March 31, 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.