Credit Quality (Summarizes the Bancorp's Recorded Investment in Impaired Loans and Related Allowance by Class) (Detail) - USD ($) $ in Millions	Sep. 30, 2017		Dec. 31, 2016
Impaired Financing Receivable Unpaid Principal Balance
Impaired Financing Receivable With Related Allowance Unpaid Principal Balance	$ 1,131		$ 1,210
Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance	573		842
Unpaid Principal Balance	1,704		2,052
Impaired Financing Receivable Recorded Investment Abstract
Impaired Financing Receivable With Related Allowance Recorded Investment	1,063		1,168
Impaired Financing Receivable With No Related Allowance Recorded Investment	524		733
Recorded investment	1,587	[1]	1,901	[2]
Allowance	192		212
Commercial Portfolio Segment | Commercial and Industrial Loans
Impaired Financing Receivable Unpaid Principal Balance
Impaired Financing Receivable With Related Allowance Unpaid Principal Balance	412		440
Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance	199		394
Impaired Financing Receivable Recorded Investment Abstract
Impaired Financing Receivable With Related Allowance Recorded Investment	352		414
Impaired Financing Receivable With No Related Allowance Recorded Investment	177		320
Allowance	80		94
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Impaired Financing Receivable Unpaid Principal Balance
Impaired Financing Receivable With Related Allowance Unpaid Principal Balance	17		24	[3]
Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance	22		36
Impaired Financing Receivable Recorded Investment Abstract
Impaired Financing Receivable With Related Allowance Recorded Investment	14		16	[3]
Impaired Financing Receivable With No Related Allowance Recorded Investment	19		35
Allowance	8		5	[3]
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Impaired Financing Receivable Unpaid Principal Balance
Impaired Financing Receivable With Related Allowance Unpaid Principal Balance	3		7
Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance	37		93
Impaired Financing Receivable Recorded Investment Abstract
Impaired Financing Receivable With Related Allowance Recorded Investment	2		6
Impaired Financing Receivable With No Related Allowance Recorded Investment	36		83
Allowance	1		1
Commercial Portfolio Segment | Commercial Leases
Impaired Financing Receivable Unpaid Principal Balance
Impaired Financing Receivable With Related Allowance Unpaid Principal Balance			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			2
Impaired Financing Receivable With No Related Allowance Recorded Investment			2
Allowance			0
Residential Mortgage Loans
Impaired Financing Receivable Unpaid Principal Balance
Impaired Financing Receivable With Related Allowance Unpaid Principal Balance	464		471
Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance	217		207
Impaired Financing Receivable Recorded Investment Abstract
Impaired Financing Receivable With Related Allowance Recorded Investment	461		465
Impaired Financing Receivable With No Related Allowance Recorded Investment	197		187
Allowance	64		68
Consumer Portfolio Segment | Home Equity
Impaired Financing Receivable Unpaid Principal Balance
Impaired Financing Receivable With Related Allowance Unpaid Principal Balance	180		202
Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance	96		107
Impaired Financing Receivable Recorded Investment Abstract
Impaired Financing Receivable With Related Allowance Recorded Investment	179		201
Impaired Financing Receivable With No Related Allowance Recorded Investment	93		104
Allowance	25		30
Consumer Portfolio Segment | Automobile Loans
Impaired Financing Receivable Unpaid Principal Balance
Impaired Financing Receivable With Related Allowance Unpaid Principal Balance	9		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	9		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	46		52
Impaired Financing Receivable Recorded Investment Abstract
Impaired Financing Receivable With Related Allowance Recorded Investment	46		52
Allowance	$ 13		$ 12

[1] Includes $ 232 , $ 646 and $ 283 , respectively, of commercial, residential mortgage and consumer portfolio TDRs on accrual status and $ 214 , $ 12 an d $ 46 , respectively, of commercial, residential mortgage a nd consumer portfolio TDRs on nonaccrual status at September 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] Excludes 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 of a VIE associated with these loans in the third quarter of 2017.