Credit Quality (Summarizes the Bancorp's Recorded Investment in Impaired Loans and Related Allowance by Class) (Parenthetical) (Detail) $ in Millions	3 Months Ended				6 Months Ended				12 Months Ended
	Jun. 30, 2017 USD ($)		Jun. 30, 2016		Jun. 30, 2017 USD ($)		Jun. 30, 2016		Dec. 31, 2016 USD ($)
Financing Receivable, Impaired
Unpaid principal balance	$ 1,841				$ 1,841				$ 2,052
Recorded investment	1,725	[1]			1,725	[1]			1,901	[2]
Allowance	$ 206				$ 206				212
Number of contracts	2,430	[3],[4]	2,669	[5],[6]	4,489	[7],[8]	5,679	[9],[10]
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Impaired
Allowance	$ 9	[11]			$ 9	[11]			5	[12]
Number of contracts	2	[3],[4]	3	[5],[6]	7	[7],[8]	10	[9],[10]
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied | Variable Interest Entity, Primary Beneficiary
Financing Receivable, Impaired
Unpaid principal balance	$ 26				$ 26				26
Recorded investment	26				26				26
Allowance	$ 18				$ 18				$ 18
Number of contracts	5		5		5		5		5
Commercial Portfolio Segment | Troubled Debt Restructuring On Accrual Status
Financing Receivable, Impaired
Recorded investment	$ 224				$ 224				$ 322
Commercial Portfolio Segment | Troubled Debt Restructuring On Nonaccrual Status
Financing Receivable, Impaired
Recorded investment	244				244				192
Residential Mortgage Loans
Financing Receivable, Impaired
Allowance	$ 66				$ 66				68
Number of contracts	199	[3],[4]	262	[5],[6]	402	[7],[8]	505	[9],[10]
Residential Mortgage Loans | Troubled Debt Restructuring On Accrual Status
Financing Receivable, Impaired
Recorded investment	$ 639				$ 639				635
Residential Mortgage Loans | Troubled Debt Restructuring On Nonaccrual Status
Financing Receivable, Impaired
Recorded investment	13				13				17
Consumer Portfolio Segment | Troubled Debt Restructuring On Accrual Status
Financing Receivable, Impaired
Recorded investment	294				294				323
Consumer Portfolio Segment | Troubled Debt Restructuring On Nonaccrual Status
Financing Receivable, Impaired
Recorded investment	$ 45				$ 45				$ 48

[1] Includes $ 224 , $ 639 and $ 294 , respectively, of commercial, residential mortgage and consumer portfolio TDRs on accrual status and $ 244 , $ 13 an d $ 45 , respectively, of commercial, residential mortgage and consumer portfolio TDRs on nonaccrual status at June 30, 2017 .

[2] Includes $ 322 , $ 635 and $ 323 , respectively, of commercial, residential mortgage and consumer portfolio TDR s on accrual status and $ 192 , $ 17 and $ 48 , respectively , of commercial, residential mortgage and consumer portfolio TDRs on nonaccrual status at December 31, 2016 .

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

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

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

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

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

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

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

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

[11] Excludes five restructured loans at June 30, 2017 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 unpaid principal balance of $ 26 , a recorded investment of $ 26 and an ALLL of $ 18 , respectively .

[12] Excludes five restructured loans at December 31, 2016 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 unpaid principal balance of $ 26 , a recorded investment of $ 26 and an ALLL of $ 18 .