Summarizes the Bancorp's Recorded Investment in Impaired Loans and Related Allowance by Class (Parenthetical) (Detail) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($) number		Dec. 31, 2015 USD ($) number
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 2,255		$ 2,029
Recorded Investment	2,065	[1]	1,842	[2]
Allowance	201		220
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Impaired [Line Items]
Allowance	81		84
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Impaired [Line Items]
Allowance	3	[3]	5	[4]
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied | Variable Interest Entity, Primary Beneficiary
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	27		27
Recorded Investment	27		27
Allowance	$ 15		$ 15
Number of Contracts | number	5		5
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Impaired [Line Items]
Allowance	$ 2		$ 12
Commercial Portfolio Segment | Troubled Debt Restructuring On Accrual Status
Financing Receivable, Impaired [Line Items]
Recorded Investment	461		491
Commercial Portfolio Segment | Troubled Debt Restructuring On Nonaccrual Status
Financing Receivable, Impaired [Line Items]
Recorded Investment	210		203
Residential Mortgage Loans
Financing Receivable, Impaired [Line Items]
Allowance	66		67
Residential Mortgage Loans | Troubled Debt Restructuring On Accrual Status
Financing Receivable, Impaired [Line Items]
Recorded Investment	636		607
Residential Mortgage Loans | Troubled Debt Restructuring On Nonaccrual Status
Financing Receivable, Impaired [Line Items]
Recorded Investment	19		23
Consumer Portfolio Segment | Troubled Debt Restructuring On Accrual Status
Financing Receivable, Impaired [Line Items]
Recorded Investment	362		372
Consumer Portfolio Segment | Troubled Debt Restructuring On Nonaccrual Status
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 53		$ 52

[1] Includes $461, $636 and $362, respectively, of commercial, residential mortgage and consumer portfolio TDRs on accrual status and $210, $19 and $53, respectively, of commercial, residential mortgage and consumer portfolio TDRs on nonaccrual status at March 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] Excludes five restructured loans at March 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 $27, a recorded investment of $27 and an ALLL of $15.

[4] Excludes five restructured 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 $27, a recorded investment of $27 and an ALLL of $15.