Loans & Leases (Total Loans And Leases Managed By The Bancorp) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Balance	$ 94,106		$ 94,106		$ 92,462
Balance of Loans 90 days or More Past Due	87		87		97
Net Charge-Offs	72	$ 68	247	$ 221
Commercial and Industrial Loans | Commercial Portfolio Segment
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Balance	42,725		42,725		41,170
Balance of Loans 90 days or More Past Due	3		3		3
Net Charge-Offs	28	27	102	79
Commercial mortgage loans | Commercial Portfolio Segment
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Balance	6,701		6,701		6,610
Balance of Loans 90 days or More Past Due	1		1		0
Net Charge-Offs		3	3	13
Net Recoveries	(1)
Commercial construction loans | Commercial Portfolio Segment
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Balance	4,892		4,892		4,553
Balance of Loans 90 days or More Past Due	0		0		0
Net Charge-Offs	0	0	0	0
Commercial leases | Commercial Portfolio Segment
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Balance	3,697		3,697		4,068
Balance of Loans 90 days or More Past Due	0		0		0
Net Charge-Offs	0	0	0	2
Residential Mortgage | Residential Mortgage
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Balance	16,148		16,148		16,077
Balance of Loans 90 days or More Past Due	40		40		57
Net Charge-Offs	2		6	5
Net Recoveries		(1)
Home Equity | Consumer Portfolio Segment
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Balance	6,485		6,485		7,014
Balance of Loans 90 days or More Past Due	0		0		0
Net Charge-Offs	3	3	9	14
Automobile Loans | Consumer Portfolio Segment
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Balance	9,002		9,002		9,112
Balance of Loans 90 days or More Past Due	11		11		10
Net Charge-Offs	9	8	28	26
Credit Card | Consumer Portfolio Segment
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Balance	2,325		2,325		2,299
Balance of Loans 90 days or More Past Due	32		32		27
Net Charge-Offs	21	20	72	64
Other Consumer Loans | Consumer Portfolio Segment
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Balance	2,131		2,131		1,559
Balance of Loans 90 days or More Past Due	0		0		0
Net Charge-Offs	10	$ 8	27	$ 18
Loans Held For Sale
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Balance	663		663		492
Loans and Leases Managed and Securitized
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Balance	$ 93,443		$ 93,443		$ 91,970