Summary of the ALLL and Related Loans and Leases Classified by Portfolio Segment (Parenthetical) (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
Allowance for loan and lease losses	$ 1,483	[1]	$ 1,582	[1]	$ 1,783	$ 1,854
Portfolio loans and leases	89,602	[2]	88,522	[3]
Recorded Investment	3,071	[4]	3,353	[5]
Leveraged Leases
Financing Receivable, Allowance for Credit Losses
Allowance for loan and lease losses	8		9
Portfolio loans and leases	878		881
Residential Mortgage Loans
Financing Receivable, Allowance for Credit Losses
Portfolio loans and leases at fair value	103		92
Variable Interest Entity, Primary Beneficiary
Financing Receivable, Allowance for Credit Losses
Allowance for loan and lease losses	11		11
Recorded Investment	$ 28		$ 28

[1] 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.

[2] Excludes $103 of loans measured at fair value.

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

[4] Includes $847, $1,237 and $430, respectively, of commercial, residential mortgage and consumer TDRs on accrual status; $209, $73 and $53, respectively, of commercial, residential mortgage and consumer TDRs on nonaccrual status.

[5] Includes $869, $1,241 and $444, respectively, of commercial, residential mortgage and consumer TDRs on accrual status; $228, $84 and $52, respectively, of commercial, residential mortgage and consumer TDRs on nonaccrual status. Excludes 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 an unpaid principal balance of $28, a recorded investment of $28, and an allowance of $11.