Summary of the ALLL and Related Loans and Leases Classified by Portfolio Segment (Detail) - USD ($) $ in Millions	Jun. 30, 2015		Mar. 31, 2015	Dec. 31, 2014		Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$ 280	[1]		$ 305	[2]
Collectively evaluated for impairment	910	[1]		911	[2]
Unallocated	103	[1]		106	[2]
Total allowance for loan and lease losses	1,293	[3]	$ 1,300	1,322	[3]	$ 1,458	$ 1,483	$ 1,582
Individually evaluated for impairment	2,152	[4]		2,261	[5]
Collectively evaluated for impairment	90,371	[4]		87,713	[5]
Loans acquired with deteriorated credit quality	2	[4]		2	[5]
Total Loans and Leases	92,525	[6]		89,976	[7]
Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	162	[1],[8]		179	[2],[9]
Collectively evaluated for impairment	693	[1]		696	[2]
Total allowance for loan and lease losses	855	[1]	852	875	[2]	961	981	1,058
Individually evaluated for impairment	1,099	[4],[8]		1,260	[5],[9]
Collectively evaluated for impairment	55,441	[4]		52,693	[5]
Total Loans and Leases	56,540	[4]		53,953	[5]
Residential Mortgage Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	65	[1]		65	[2]
Collectively evaluated for impairment	39	[1]		39	[2]
Total allowance for loan and lease losses	104	[1]	103	104	[2]	174	180	189
Individually evaluated for impairment	603	[4]		518	[5]
Collectively evaluated for impairment	12,150	[4]		11,761	[5]
Loans acquired with deteriorated credit quality	2	[4]		2	[5]
Total Loans and Leases	12,755	[4]		12,281	[5]
Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	53	[1]		61	[2]
Collectively evaluated for impairment	178	[1]		176	[2]
Total allowance for loan and lease losses	231	[1]	241	237	[2]	221	217	225
Individually evaluated for impairment	450	[4]		483	[5]
Collectively evaluated for impairment	22,780	[4]		23,259	[5]
Total Loans and Leases	23,230	[4]		23,742	[5]
Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Unallocated	103	[1]		106	[2]
Total allowance for loan and lease losses	$ 103	[1]	$ 104	$ 106	[2]	$ 102	$ 105	$ 110

[1] Includes $5 related to leveraged leases.

[2] Includes $6 related to leveraged leases.

[3] Includes $156 and $179 of cash and due from banks, $2,547 and $3,378 of portfolio loans and leases, $(29) and $(22) of ALLL, $23 and $25 of other assets, $4 and $5 of other liabilities, and $2,542 and $3,434 of long-term debt from consolidated VIEs that are included in their respective captions above at June 30, 2015 and December 31, 2014, respectively. For further information refer to Note 10.

[4] Excludes $178 of residential mortgage loans measured at fair value, and includes $880 of leveraged leases, net of unearned income.

[5] Excludes $108 of residential mortgage loans measured at fair value, and includes $874 of leveraged leases, net of unearned income.

[6] Excludes $178 of residential mortgage loans measured at fair value.

[7] Excludes $108 of residential mortgage loans measured at fair value.

[8] Includes five restructured loans at June 30, 2015 associated with a consolidated VIE in which the Bancorp has no continuing credit risk due to the risk being assumed by a third party, with a recorded investment of $28 and an ALLL of $16.

[9] Includes five restructured loans at December 31, 2014 associated with a consolidated VIE in which the Bancorp has no continuing credit risk due to the risk being assumed by a third party, with a recorded investment of $28 and an ALLL of $10.