Summary of the ALLL and Related Loans and Leases Classified by Portfolio Segment (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Mar. 31, 2014	Dec. 31, 2013		Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment	$ 392	[1]		$ 378	[2]
Collectively evaluated for impairment	964	[1]		1,094	[2]
Unallocated	102	[1]		110	[2]
Total allowance for loan and lease losses	1,458	[3]	1,483	1,582	[3]	1,735	1,783	1,854
Individually evaluated for impairment	3,012	[4]		3,381	[5]
Collectively evaluated for impairment	87,369	[4]		85,137	[5]
Loans acquired with deteriorated credit quality	4	[4]		4	[5]
Total Loans and Leases	90,385	[6]		88,522	[7]
Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment	204	[1],[8]		186	[2],[9]
Collectively evaluated for impairment	757	[1]		872	[2]
Total allowance for loan and lease losses	961	[1]	981	1,058	[2]	1,183	1,191	1,236
Individually evaluated for impairment	1,274	[4],[8]		1,560	[5],[9]
Collectively evaluated for impairment	52,821	[4]		50,486	[5]
Total Loans and Leases	54,095	[4]		52,046	[5]
Residential Mortgage Loans
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment	134	[1]		139	[2]
Collectively evaluated for impairment	40	[1]		50	[2]
Total allowance for loan and lease losses	174	[1]	180	189	[2]	201	212	229
Individually evaluated for impairment	1,263	[4]		1,325	[5]
Collectively evaluated for impairment	11,286	[4]		11,259	[5]
Loans acquired with deteriorated credit quality	4	[4]		4	[5]
Total Loans and Leases	12,553	[4]		12,588	[5]
Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment	54	[1]		53	[2]
Collectively evaluated for impairment	167	[1]		172	[2]
Total allowance for loan and lease losses	221	[1]	217	225	[2]	247	272	278
Individually evaluated for impairment	475	[4]		496	[5]
Collectively evaluated for impairment	23,262	[4]		23,392	[5]
Total Loans and Leases	23,737	[4]		23,888	[5]
Unallocated
Financing Receivable, Allowance for Credit Losses
Unallocated	102	[1]		110	[2]
Total allowance for loan and lease losses	$ 102	[1]	$ 105	$ 110	[2]	$ 104	$ 108	$ 111

[1] Includes $7 related to leveraged leases.

[2] Includes $9 related to leveraged leases.

[3] Includes $158 and $49 of cash and due from banks, $48 and $48 of commercial mortgage loans, $3,200 and $1,010 of automobile loans, $(20) and $(15) of ALLL, $32 and $13 of other assets, $6 and $1 of other liabilities, and $3,333 and $1,048 of long-term debt from consolidated VIEs that are included in their respective captions above at June 30, 2014 and December 31, 2013, respectively. See Note 9.

[4] Excludes $99 of residential mortgage loans measured at fair value, and includes $880 of leveraged leases, net of unearned income.

[5] Excludes $92 of residential mortgage loans measured at fair value, and includes $881 of leveraged leases, net of unearned income. Includes five restructured loans at 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, with a recorded investment of $28 and an allowance of $11.

[6] Excludes $99 of loans measured at fair value.

[7] Excludes $92 of loans measured at fair value.

[8] Includes five restructured loans at June 30, 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 allowance of $10.

[9] Includes five restructured loans at 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, with a recorded investment of $28 and an allowance of $11.