Summary of the ALLL and Related Loans and Leases Classified by Portfolio Segment (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013		Mar. 31, 2013	Dec. 31, 2012		Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment	$ (282)	[1]		$ (294)	[2]
Collectively evaluated for impairment	1,348	[1]		1,447	[2]
Loans acquired with deteriorated credit quality	1	[1]		2	[2]
Unallocated	104	[1]		111	[2]
Total allowance for loan and lease losses	1,735	[3]	1,783	1,854	[3]	2,016	2,126	2,255
Individually evaluated for impairment	2,757	[4]		2,822	[5]
Collectively evaluated for impairment	84,187	[4]		82,877	[5]
Loans acquired with deteriorated credit quality	5	[4]		7	[5]
Total Loans and Leases	86,949	[4],[6],[7]		85,706	[8],[9]
Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment	(89)	[1],[10]		(95)	[2]
Collectively evaluated for impairment	1,094	[1]		1,140	[2]
Loans acquired with deteriorated credit quality				1	[2]
Total allowance for loan and lease losses	1,183	[1]	1,191	1,236	[2]	1,347	1,424	1,527
Individually evaluated for impairment	924	[10],[4]		980	[5]
Collectively evaluated for impairment	49,696	[4]		48,407	[5]
Loans acquired with deteriorated credit quality				1	[5]
Total Loans and Leases	50,620	[4]		49,388	[5]
Residential Mortgage Loans
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment	(134)	[1]		(137)	[2]
Collectively evaluated for impairment	66	[1]		91	[2]
Loans acquired with deteriorated credit quality	1	[1]		1	[2]
Total allowance for loan and lease losses	201	[1]	212	229	[2]	232	233	227
Individually evaluated for impairment	1,306	[4]		1,298	[5]
Collectively evaluated for impairment	11,006	[4]		10,637	[5]
Loans acquired with deteriorated credit quality	5	[4]		6	[5]
Total Loans and Leases	12,317	[4]		11,941	[5]
Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment	(59)	[1]		(62)	[2]
Collectively evaluated for impairment	188	[1]		216	[2]
Total allowance for loan and lease losses	247	[1]	272	278	[2]	316	341	365
Individually evaluated for impairment	527	[4]		544	[5]
Collectively evaluated for impairment	23,485	[4]		23,833	[5]
Total Loans and Leases	24,012	[4]		24,377	[5]
Unallocated
Financing Receivable, Allowance for Credit Losses
Unallocated	104	[1]		111	[2]
Total allowance for loan and lease losses	$ 104	[1]	$ 108	$ 111	[2]	$ 121	$ 128	$ 136

[1] Includes $10 related to leveraged leases.

[2] Includes $11 related to leveraged leases.

[3] Includes $50 and $50 of commercial mortgage loans, $(13) and $(5) of ALLL, and $1 and $3 of other assets from consolidated VIEs that are included in their respective captions above at June 30, 2013 and December 31, 2012, respectively. See Note 8.

[4] Excludes $83 of residential mortgage loans measured at fair value, and includes $872 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 $83 of loans measured at fair value.

[7] Includes an immaterial amount of government insured commercial loans 30-89 days and 90 days past due and accruing whose repayments are insured by the SBA at June 30, 2013.

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

[9] 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.

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