Summary of Loans Modified in a TDR (Parenthetical) (Detail) $ in Millions		12 Months Ended
		Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	[1],[2]	14,472	11,102	11,291
Financing Receivable Modifications Post Modification Recorded Investment1	[1]	$ 409	$ 548	$ 1,081
Allowance for Loan and Lease Losses, Adjustments, Net	[1]	23	27	58
Allowance for Loan and Lease Losses, Write-offs	[1]	$ 10	$ 8	$ 44
Commercial Portfolio Segment | Commercial Mortgage Loans Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	[1],[2]	18	32	65	[3]
Financing Receivable Modifications Post Modification Recorded Investment1	[1]	$ 16	$ 54	$ 19	[3]
Allowance for Loan and Lease Losses, Adjustments, Net	[1]	$ (2)	$ (1)	(2)	[3]
Commercial Portfolio Segment | Commercial Mortgage Loans Owner Occupied [Member] | Variable Interest Entity, Primary Beneficiary
Financing Receivable, Modifications [Line Items]
Financing Receivable Modifications Post Modification Recorded Investment1				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 which were accounted for within a pool.

[2] Represents number of loans post-modification and excludes loans previously modified in a TDR.

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