Summary of Loans Modified in a TDR (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended						3 Months Ended	6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012	Jun. 30, 2013 Commercial Portfolio Segment Commercial Mortgage Loans, Owner Occupied		Jun. 30, 2012 Commercial Portfolio Segment Commercial Mortgage Loans, Owner Occupied	Jun. 30, 2013 Consolidated Variable Interest Entity Commercial Portfolio Segment Commercial Mortgage Loans, Owner Occupied	Jun. 30, 2013 Consolidated Variable Interest Entity Commercial Portfolio Segment Commercial Mortgage Loans, Owner Occupied
Financing Receivable, Modifications
Financing Receivable, Modifications, Number of Contracts	6,181	[1]	8,128	24	[1],[2]	36	5	5
Financing Receivable Modifications Post Modification Recorded Investment	$ 384	[1]	$ 401	$ 9	[1]	$ 15	$ 29	$ 29
Allowance for Loan and Lease Losses, Adjustments, Net	14	[1]	3	(1)	[1]	(3)	7	7
Allowance for Loan and Lease Losses, Write-offs	$ 1	[1]					$ 2	$ 2

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

[2] Excludes five loans modified in a TDR during the three months ended June 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.