Loans & Leases (Total Loans And Leases Managed By The Bancorp) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 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
Balance	$ 92,715		$ 92,715		$ 92,462
Balance of Loans 90 days or More Past Due	89		89		97
Net Charge-Offs	94	$ 64	175	$ 153
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
Balance	41,447		41,447		41,170
Balance of Loans 90 days or More Past Due	4		4		3
Net Charge-Offs	47	18	74	52
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
Balance	6,697		6,697		6,610
Balance of Loans 90 days or More Past Due	0		0		0
Net Charge-Offs	2	5	2	11
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
Balance	4,687		4,687		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
Balance	3,797		3,797		4,068
Balance of Loans 90 days or More Past Due	0		0		0
Net Charge-Offs	0	1	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
Balance	16,298		16,298		16,077
Balance of Loans 90 days or More Past Due	44		44		57
Net Charge-Offs	2	2	4	7
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
Balance	6,599		6,599		7,014
Balance of Loans 90 days or More Past Due	0		0		0
Net Charge-Offs	2	5	7	11
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
Balance	8,938		8,938		9,112
Balance of Loans 90 days or More Past Due	10		10		10
Net Charge-Offs	8	6	19	18
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
Balance	2,270		2,270		2,299
Balance of Loans 90 days or More Past Due	31		31		27
Net Charge-Offs	26	22	52	43
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
Balance	1,982		1,982		1,559
Balance of Loans 90 days or More Past Due	0		0		0
Net Charge-Offs	7	$ 5	17	$ 9
Loans Held For Sale
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together
Balance	783		783		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
Balance	$ 91,932		$ 91,932		$ 91,970