Summary of Loans Modified in a TDR (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012
Financing Receivable, Modifications
Financing Receivable, Modifications, Number of Contracts	8,920	[1],[2]	11,498	[1],[2]
Financing Receivable Modifications Post Modification Recorded Investment	$ 575	[1]	$ 592	[1]
Allowance for Loan and Lease Losses, Adjustments, Net	8	[1]	6	[1]
Allowance for Loan and Lease Losses, Write-offs	1	[1]	7	[1]
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner Occupied
Financing Receivable, Modifications
Financing Receivable, Modifications, Number of Contracts	56	[1],[2],[3]	52	[1],[2]
Financing Receivable Modifications Post Modification Recorded Investment	16	[1],[3]	45	[1]
Allowance for Loan and Lease Losses, Adjustments, Net	(1)	[1],[3]	(6)	[1]
Allowance for Loan and Lease Losses, Write-offs			2	[1]
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner Occupied | Consolidated Variable Interest Entity
Financing Receivable, Modifications
Financing Receivable, Modifications, Number of Contracts	5
Financing Receivable Modifications Post Modification Recorded Investment	29
Allowance for Loan and Lease Losses, Adjustments, Net	7
Allowance for Loan and Lease Losses, Write-offs	$ 2

[1] Excludes all loans and leases held for sale and loans acquired with deteriorated credit quality.

[2] Represents number of loans post-modification.

[3] Excludes five loans modified in a TDR during the nine months ended September 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. The TDR has a recorded investment of $29, ALLL increased $7 upon modification, and a charge-off of $2 was recognized upon modification.