Loans & Leases (Total Loans And Leases Managed By The Bancorp) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together
Balance	$ 92,594		$ 92,594		$ 92,849
Balance of Loans 90 days or More Past Due	77		77		84
Net Charge-Offs	68	$ 107	221	$ 289
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	41,027		41,027		41,736
Balance of Loans 90 days or More Past Due	3		3		4
Net Charge-Offs	27	61	79	147
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	6,871		6,871		6,904
Balance of Loans 90 days or More Past Due	0		0		0
Net Charge-Offs	3	2	13	14
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	4,652		4,652		3,903
Balance of Loans 90 days or More Past Due	0		0		0
Net Charge-Offs	0	0	0
Net Recoveries				1
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	4,046		4,046		3,974
Balance of Loans 90 days or More Past Due	0		0		0
Net Charge-Offs	0	0	2	3
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	16,272		16,272		15,737
Balance of Loans 90 days or More Past Due	43		43		49
Net Charge-Offs		2	5	7
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
Balance	7,143		7,143		7,695
Balance of Loans 90 days or More Past Due	0		0		0
Net Charge-Offs	3	7	14	20
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	9,236		9,236		9,983
Balance of Loans 90 days or More Past Due	10		10		9
Net Charge-Offs	8	9	26	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
Balance	2,168		2,168		2,237
Balance of Loans 90 days or More Past Due	21		21		22
Net Charge-Offs	20	20	64	61
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	1,179		1,179		680
Balance of Loans 90 days or More Past Due	0		0		0
Net Charge-Offs	8	$ 6	18	$ 12
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	711		711		751
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	$ 91,883		$ 91,883		$ 92,098