Credit Quality (Summary of the Average Impaired Loans and Leases and Interest Income by Class) (Parenthetical) (Detail)		12 Months Ended
		Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Financing Receivable, Impaired
Average Recorded Investment		$ 1,469,000,000	$ 1,677,000,000	$ 1,946,000,000
Number of Contracts	[1],[2]	8,869	9,256	10,978
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-Occupied
Financing Receivable, Impaired
Average Recorded Investment	[3]	$ 15,000,000	$ 35,000,000	$ 63,000,000
Number of Contracts	[1],[2]	6	9	12
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-Occupied | Variable Interest Entity, Primary Beneficiary
Financing Receivable, Impaired
Average Recorded Investment			$ 13,000,000	$ 26,000,000

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

[2] Excludes all loans and leases held for sale and loans acquired with deteriorated credit quality which were accounted for within a pool .

[3] Excludes five restructured loans associated with a consolid ated VIE in which the Bancorp had no continuing credit risk due to the risk being assumed by a third party, with an average recorded investment of $ 13 and $ 26 for t he years ended December 31, 2017 and 2016, respectively. An immaterial amount of interest income was recognized during both t he years ended December 31, 2017 and 2016. Refer to Note 10 for further discus sion on the deconsolidation of the VIE associated with these loans in the third qu arter of 2017.