Loans & Leases (Total Loans And Leases Managed By The Bancorp) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together
Balance	$ 92,462	$ 92,849
Balance of Loans 90 days or More Past Due	97	84
Net Charge-Offs	298	362
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	41,170	41,736
Balance of Loans 90 days or More Past Due	3	4
Net Charge-Offs	111	172
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	6,610	6,904
Balance of Loans 90 days or More Past Due	0	0
Net Charge-Offs	12	15
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	4,553	3,903
Balance of Loans 90 days or More Past Due	0	0
Net Charge-Offs		(1)
Net Recoveries	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	4,068	3,974
Balance of Loans 90 days or More Past Due	0	0
Net Charge-Offs	2	4
Residential Mortgage
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together
Balance	16,077	15,737
Balance of Loans 90 days or More Past Due	57	49
Net Charge-Offs	7	10
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	7,014	7,695
Balance of Loans 90 days or More Past Due	0	0
Net Charge-Offs	19	27
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	9,112	9,983
Balance of Loans 90 days or More Past Due	10	9
Net Charge-Offs	37	35
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	2,299	2,237
Balance of Loans 90 days or More Past Due	27	22
Net Charge-Offs	84	80
Other Consumer Loans and Leases | Consumer Portfolio Segment
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together
Balance	1,559	680
Balance of Loans 90 days or More Past Due	0	0
Net Charge-Offs	26	20
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	492	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	$ 91,970	$ 92,098