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, 2016 USD ($)		Jun. 30, 2015 USD ($)	[5],[6]	Jun. 30, 2016 USD ($)		Jun. 30, 2016 USD ($) number		Jun. 30, 2015		Dec. 31, 2015 USD ($) number
Financing Receivable, Impaired
Unpaid principal balance	$ 2,249				$ 2,249		$ 2,249				$ 2,029
Recorded investment	2,032	[1]			2,032	[1]	2,032	[1]			1,842	[2]
Allowance	$ 192				$ 192		192				220
Number of contracts	2,669	[3],[4]	3,468		5,679	[3],[4]			7,676	[5],[6]
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Impaired
Allowance	$ 73				$ 73		73				84
Number of contracts	20	[3],[4]	27		44	[3],[4]			48	[5],[6]
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Impaired
Allowance	$ 2	[7]			$ 2	[7]	2	[7]			5	[8]
Number of contracts	3	[3],[4]	6		10	[3],[4]			13	[5],[6]
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied | Variable Interest Entity, Primary Beneficiary
Financing Receivable, Impaired
Unpaid principal balance	$ 27				$ 27		27				27
Recorded investment	27				27		27				27
Allowance	18				$ 18		$ 18				$ 15
Number of contracts					5		5		5		5
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Impaired
Allowance	$ 4				$ 4		$ 4				$ 12
Number of contracts	2	[3],[4]	5		4	[3],[4]			11	[5],[6]
Commercial Portfolio Segment | Troubled Debt Restructuring On Accrual Status
Financing Receivable, Impaired
Recorded investment	$ 431				$ 431		431				491
Commercial Portfolio Segment | Troubled Debt Restructuring On Nonaccrual Status
Financing Receivable, Impaired
Recorded investment	242				242		242				203
Residential Mortgage Loans
Financing Receivable, Impaired
Allowance	$ 67				$ 67		67				67
Number of contracts	262	[3],[4]	254		505	[3],[4]			554	[5],[6]
Residential Mortgage Loans | Troubled Debt Restructuring On Accrual Status
Financing Receivable, Impaired
Recorded investment	$ 633				$ 633		633				607
Residential Mortgage Loans | Troubled Debt Restructuring On Nonaccrual Status
Financing Receivable, Impaired
Recorded investment	16				16		16				23
Consumer Portfolio Segment | Troubled Debt Restructuring On Accrual Status
Financing Receivable, Impaired
Recorded investment	349				349		349				372
Consumer Portfolio Segment | Troubled Debt Restructuring On Nonaccrual Status
Financing Receivable, Impaired
Recorded investment	$ 50				$ 50		$ 50				$ 52

[1] Includes $ 431 , $ 633 and $ 349 , respectively, of commercial, residential mortgage and consumer portfolio TDRs on accrual status and $ 242 , $ 16 an d $ 50 , respectively , of commercial , residential mortgage and consumer portfolio TDRs on nonaccrual status at June 30, 2016 .

[2] Includes $ 491 , $ 607 and $ 372 , respectively, of commercial , resid ential mortgage and consumer portfolio TDR s on accrual status and $ 2 03 , $ 2 3 and $ 52 , respectively , of commercial, reside ntial mortgage and consumer portfolio TDR s on nonaccrual status at December 31, 2015 .

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

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

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

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

[7] Excludes five restructured loans at June 30, 2016 associated with a consolidated VIE in which the Bancorp has no continuing credit ris k 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 $ 18 .

[8] Excludes five restruc tured loans at December 31, 2015 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 $ 2 7 , a recorded investment of $ 27 and an ALLL of $ 15 .