Credit Quality (Summarizes the Bancorp's Recorded Investment in Impaired Loans and Related Allowance by Class) (Parenthetical) (Detail) $ in Millions		12 Months Ended
		Dec. 31, 2016 USD ($)		Dec. 31, 2015 USD ($)		Dec. 31, 2014
Financing Receivable, Impaired
Unpaid Principal Balance		$ 2,052		$ 2,029
Recorded Investment		1,901	[1]	1,842	[2]
Allowance		$ 212		$ 220
Number of Contracts	[3],[4]	10,978		14,472		11,102
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Impaired
Allowance		$ 94		$ 84
Number of Contracts	[3],[4]	74		77		128
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-Occupied
Financing Receivable, Impaired
Allowance		$ 5	[5]	$ 5	[6]
Number of Contracts	[3],[4]	12		18		32
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-Occupied | Variable Interest Entity, Primary Beneficiary
Financing Receivable, Impaired
Unpaid Principal Balance		$ 26		$ 27
Recorded Investment		26		27
Allowance		18		15
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Impaired
Allowance		$ 1		$ 12
Number of Contracts	[3],[4]	4		12		28
Commercial Portfolio Segment | Troubled Debt Restructuring On Accrual Status [Member]
Financing Receivable, Impaired
Unpaid Principal Balance		$ 322		$ 491
Commercial Portfolio Segment | Troubled Debt Restructuring On Nonaccrual Status [Member]
Financing Receivable, Impaired
Unpaid Principal Balance		192		203
Residential Portfolio Segment
Financing Receivable, Impaired
Allowance		$ 68		$ 67
Number of Contracts	[3],[4]	924		1,089		1,093
Residential Portfolio Segment | Troubled Debt Restructuring On Accrual Status [Member]
Financing Receivable, Impaired
Unpaid Principal Balance		$ 635		$ 607
Residential Portfolio Segment | Troubled Debt Restructuring On Nonaccrual Status [Member]
Financing Receivable, Impaired
Unpaid Principal Balance		17		23
Consumer Portfolio Segment | Troubled Debt Restructuring On Accrual Status [Member]
Financing Receivable, Impaired
Unpaid Principal Balance		323		372
Consumer Portfolio Segment | Troubled Debt Restructuring On Nonaccrual Status [Member]
Financing Receivable, Impaired
Unpaid Principal Balance		$ 48		$ 52

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

[2] Includes $ 491 , $ 607 and $ 372 , respectively, of commercial, residential mortgage and consumer portfolio TDRs on accrual status and $ 203 , $ 23 and $ 52 , respectively, of commercial, residential mortgage and consumer portfolio TDRs on nonaccrual status at December 31, 2015 .

[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] Excludes five restructured l oans 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 .

[6] Excludes five restructured loans at December 31, 2015 associated with a consolidated VI E 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 $ 27 , a recorded investment of $ 27 and an ALLL of $ 15 .