Credit Quality (Summarizes the Bancorp's Recorded Investment in Impaired Loans and Related Allowance by Class) (Detail) - USD ($) $ in Millions	Dec. 31, 2017		Dec. 31, 2016
Impaired Financing Receivable Unpaid Principal Balance
Impaired Financing Receivable With Related Allowance Unpaid Principal Balance	$ 1,158		$ 1,210
Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance	521		842
Unpaid Principal Balance	1,679		2,052
Impaired Financing Receivable Recorded Investment Abstract
Impaired Financing Receivable With Related Allowance Recorded Investment	1,068		1,168
Impaired Financing Receivable With No Related Allowance Recorded Investment	477		733
Recorded Investment	1,545	[1]	1,901	[2]
Allowance	200		212
Commercial Portfolio Segment | Commercial and Industrial Loans
Impaired Financing Receivable Unpaid Principal Balance
Impaired Financing Receivable With Related Allowance Unpaid Principal Balance	433		440
Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance	151		394
Impaired Financing Receivable Recorded Investment Abstract
Impaired Financing Receivable With Related Allowance Recorded Investment	358		414
Impaired Financing Receivable With No Related Allowance Recorded Investment	131		320
Allowance	87		94
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-Occupied
Impaired Financing Receivable Unpaid Principal Balance
Impaired Financing Receivable With Related Allowance Unpaid Principal Balance	16		24	[3]
Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance	18		36
Impaired Financing Receivable Recorded Investment Abstract
Impaired Financing Receivable With Related Allowance Recorded Investment	14		16	[4]
Impaired Financing Receivable With No Related Allowance Recorded Investment	15		35
Allowance	7		5	[4]
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Impaired Financing Receivable Unpaid Principal Balance
Impaired Financing Receivable With Related Allowance Unpaid Principal Balance	4		7
Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance	35		93
Impaired Financing Receivable Recorded Investment Abstract
Impaired Financing Receivable With Related Allowance Recorded Investment	3		6
Impaired Financing Receivable With No Related Allowance Recorded Investment	35		83
Allowance	0		1
Commercial Portfolio Segment | Commercial Leases
Impaired Financing Receivable Unpaid Principal Balance
Impaired Financing Receivable With Related Allowance Unpaid Principal Balance	4		2
Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance			2
Impaired Financing Receivable Recorded Investment Abstract
Impaired Financing Receivable With Related Allowance Recorded Investment	4		2
Impaired Financing Receivable With No Related Allowance Recorded Investment			2
Allowance	0		0
Residential Portfolio Segment
Impaired Financing Receivable Unpaid Principal Balance
Impaired Financing Receivable With Related Allowance Unpaid Principal Balance	469		471
Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance	218		207
Impaired Financing Receivable Recorded Investment Abstract
Impaired Financing Receivable With Related Allowance Recorded Investment	465		465
Impaired Financing Receivable With No Related Allowance Recorded Investment	200		187
Allowance	64		68
Consumer Portfolio Segment | Home Equity
Impaired Financing Receivable Unpaid Principal Balance
Impaired Financing Receivable With Related Allowance Unpaid Principal Balance	172		202
Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance	97		107
Impaired Financing Receivable Recorded Investment Abstract
Impaired Financing Receivable With Related Allowance Recorded Investment	172		201
Impaired Financing Receivable With No Related Allowance Recorded Investment	94		104
Allowance	27		30
Consumer Portfolio Segment | Automobile Loans
Impaired Financing Receivable Unpaid Principal Balance
Impaired Financing Receivable With Related Allowance Unpaid Principal Balance	8		12
Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance	2		3
Impaired Financing Receivable Recorded Investment Abstract
Impaired Financing Receivable With Related Allowance Recorded Investment	7		12
Impaired Financing Receivable With No Related Allowance Recorded Investment	2		2
Allowance	1		2
Consumer Portfolio Segment | Credit Card
Impaired Financing Receivable Unpaid Principal Balance
Impaired Financing Receivable With Related Allowance Unpaid Principal Balance	52		52
Impaired Financing Receivable Recorded Investment Abstract
Impaired Financing Receivable With Related Allowance Recorded Investment	45		52
Allowance	$ 14		$ 12

[1] Includes $ 249 , $ 652 and $ 275 , respectively, of commercial, residential mortgage and consumer portfolio TDRs on accrual status and $ 150 , $ 13 and $ 45 , respectively, of commercial, residential mortgage and consumer portfolio TDRs on nonaccrual status at December 31, 2017 .

[2] 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 .

[3] Ex cludes five restructured loans at December 31, 2016 associated with a consolidated VIE in which the Bancorp had 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 . Refer to Note 11 for further discussion on the deconsolidation o f a VIE associated with these loans in the third quarter of 2017.

[4] Ex cludes five restructured loans at December 31, 2016 associated with a consolidated VIE in which the Bancorp had 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 . Refer to Note 11 for further discussion on the deconsolidation o f a VIE associated with these loans in the third quarter of 2017.