Summary of the Average Impaired Loans and Leases and Interest Income by Class (Parenthetical) (Detail) $ in Millions		12 Months Ended
		Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Financing Receivable, Impaired [Line Items]
Average Recorded Investment		$ 2,062	$ 3,061	$ 2,942
Number of Contracts	[1],[2]	14,472	11,102	11,291
Commercial Portfolio Segment | Commercial Mortgage Loans Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	[3]	$ 92	$ 149	$ 146
Number of Contracts	[1],[2]	18	32	65	[4]
Commercial Portfolio Segment | Commercial Mortgage Loans Owner Occupied [Member] | Variable Interest Entity, Primary Beneficiary
Financing Receivable, Impaired [Line Items]
Average Recorded Investment		$ 27	$ 28	$ 28

[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 restructured loans 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 average recorded investment of $27 for the year ended December 31, 2015 and $28 for both of the years ended December 31, 2014 and 2013. An immaterial amount of interest income was recognized during the years ended December 31, 2015, 2014 and 2013.

[4] 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.