Summary of the ALLL and Related Loans and Leases Classified by Portfolio Segment (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013		Mar. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment	$ 373	[1]	$ 378	[2]
Collectively evaluated for impairment	1,005	[1]	1,094	[2]
Unallocated	105	[1]	110	[2]
Total allowance for loan and lease losses	1,483	[3]	1,582	[3]	1,783	1,854
Individually evaluated for impairment	3,099	[4]	3,381	[5]
Collectively evaluated for impairment	86,499	[4]	85,137	[5]
Loans acquired with deteriorated credit quality	4	[4]	4	[5]
Total Loans and Leases	89,602	[6]	88,522	[7]
Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment	182	[1],[8]	186	[2],[9]
Collectively evaluated for impairment	799	[1]	872	[2]
Total allowance for loan and lease losses	981	[1]	1,058	[2]	1,191	1,236
Individually evaluated for impairment	1,306	[4],[8]	1,560	[5],[9]
Collectively evaluated for impairment	52,038	[4]	50,486	[5]
Total Loans and Leases	53,344	[4]	52,046	[5]
Residential Mortgage Loans
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment	140	[1]	139	[2]
Collectively evaluated for impairment	40	[1]	50	[2]
Total allowance for loan and lease losses	180	[1]	189	[2]	212	229
Individually evaluated for impairment	1,310	[4]	1,325	[5]
Collectively evaluated for impairment	11,209	[4]	11,259	[5]
Loans acquired with deteriorated credit quality	4	[4]	4	[5]
Total Loans and Leases	12,523	[4]	12,588	[5]
Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment	51	[1]	53	[2]
Collectively evaluated for impairment	166	[1]	172	[2]
Total allowance for loan and lease losses	217	[1]	225	[2]	272	278
Individually evaluated for impairment	483	[4]	496	[5]
Collectively evaluated for impairment	23,252	[4]	23,392	[5]
Total Loans and Leases	23,735	[4]	23,888	[5]
Unallocated
Financing Receivable, Allowance for Credit Losses
Unallocated	105	[1]	110	[2]
Total allowance for loan and lease losses	$ 105	[1]	$ 110	[2]	$ 108	$ 111

[1] Includes $8 related to leveraged leases.

[2] Includes $9 related to leveraged leases.

[3] Includes $102 and $49 of cash and due from banks, $7 and $0 of other short-term investments, $48 and $48 of commercial mortgage loans, $2,031 and $1,010 of automobile loans, $(18) and $(15) of ALLL, $23 and $13 of other assets, $3 and $1 of other liabilities, and $2,119 and $1,048 of long-term debt from consolidated VIEs that are included in their respective captions above at March 31, 2014 and December 31, 2013, respectively. See Note 8.

[4] Excludes $103 of residential mortgage loans measured at fair value, and includes $878 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 $103 of loans measured at fair value.

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

[8] Includes five restructured loans at March 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 allowance of $11.

[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.