Summary of the ALLL and Related Loans and Leases Classified by Portfolio Segment (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013		Jun. 30, 2013	Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment	$ 353	[1]		$ 294	[2]
Collectively evaluated for impairment	1,223	[1]		1,447	[2]
Loans acquired with deteriorated credit quality				2	[2]
Unallocated	101	[1]		111	[2]
Total allowance for loan and lease losses	1,677	[3]	1,735	1,854	[3]	1,925	2,016	2,255
Individually evaluated for impairment	3,228	[4]		2,822	[5]
Collectively evaluated for impairment	83,909	[4]		82,877	[5]
Loans acquired with deteriorated credit quality	5	[4]		7	[5]
Total Loans and Leases	87,142	[6]		85,706	[7],[8]
Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment	164	[1],[9]		95	[2]
Collectively evaluated for impairment	983	[1]		1,140	[2]
Loans acquired with deteriorated credit quality				1	[2]
Total allowance for loan and lease losses	1,147	[1]	1,183	1,236	[2]	1,287	1,347	1,527
Individually evaluated for impairment	1,396	[4],[9]		980	[5]
Collectively evaluated for impairment	49,356	[4]		48,407	[5]
Loans acquired with deteriorated credit quality				1	[5]
Total Loans and Leases	50,752	[4]		49,388	[5]
Residential Mortgage Loans
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment	135	[1]		137	[2]
Collectively evaluated for impairment	59	[1]		91	[2]
Loans acquired with deteriorated credit quality				1	[2]
Total allowance for loan and lease losses	194	[1]	201	229	[2]	232	232	227
Individually evaluated for impairment	1,316	[4]		1,298	[5]
Collectively evaluated for impairment	11,124	[4]		10,637	[5]
Loans acquired with deteriorated credit quality	5	[4]		6	[5]
Total Loans and Leases	12,445	[4]		11,941	[5]
Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment	54	[1]		62	[2]
Collectively evaluated for impairment	181	[1]		216	[2]
Total allowance for loan and lease losses	235	[1]	247	278	[2]	290	316	365
Individually evaluated for impairment	516	[4]		544	[5]
Collectively evaluated for impairment	23,429	[4]		23,833	[5]
Total Loans and Leases	23,945	[4]		24,377	[5]
Unallocated
Financing Receivable, Allowance for Credit Losses
Unallocated	101	[1]		111	[2]
Total allowance for loan and lease losses	$ 101	[1]	$ 104	$ 111	[2]	$ 116	$ 121	$ 136

[1] Includes $10 related to leveraged leases.

[2] Includes $11 related to leveraged leases.

[3] Includes $53 and $0 of cash and due from banks, $50 and $50 of commercial mortgage loans, $1,145 and $0 of automobile loans, $(16) and $(5) of ALLL, $12 and $3 of other assets, $2 and $0 of other liabilities, and $1,198 and $0 of long-term debt from consolidated VIEs that are included in their respective captions above at September 30, 2013 and December 31, 2012, respectively. See Note 9.

[4] Excludes $89 of residential mortgage loans measured at fair value, and includes $875 of leveraged leases, net of unearned income.

[5] Excludes $76 of residential mortgage loans measured at fair value, and includes $862 of leveraged leases, net of unearned income.

[6] Excludes $89 of loans measured at fair value.

[7] Excludes $76 of loans measured at fair value.

[8] Includes an immaterial amount of government insured commercial loans 30-89 and 90 days past due and accruing whose repayments are insured by the SBA at December 31, 2012.

[9] Includes five restructured nonaccrual loans at 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, with a recorded investment of $29 and an allowance of $11.