Credit Quality (Summary of the ALLL and Related Loans and Leases Classified by Portfolio Segment) (Detail) - USD ($) $ in Millions	Mar. 31, 2017		Dec. 31, 2016		Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment	$ 223	[1]	$ 230	[2]
Collectively evaluated for impairment	903	[1]	911	[2]
Unallocated	112	[1]	112	[2]
Total allowance for loan and lease losses	1,238	[1]	1,253	[2],[3]	$ 1,295	$ 1,272
Individually evaluated for impairment	1,796	[4]	1,927	[5]
Collectively evaluated for impairment	89,689	[4]	90,025	[5]
Loans acquired with deteriorated credit quality	2	[4]	3	[5]
Total portfolio loans and leases	91,487	[4],[6]	91,955	[5],[7]
Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment	113	[1],[8]	118	[2],[9]
Collectively evaluated for impairment	713	[1]	713	[2]
Unallocated	0	[1]	0	[2]
Total allowance for loan and lease losses	826	[1]	831	[2]	867	840
Individually evaluated for impairment	786	[4],[8]	904	[5],[9]
Collectively evaluated for impairment	55,587	[4]	55,548	[5]
Loans acquired with deteriorated credit quality	0	[4]	0	[5]
Total portfolio loans and leases	56,373	[4]	56,452	[5]
Residential Mortgage Loans
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment	68	[1]	68	[2]
Collectively evaluated for impairment	28	[1]	28	[2]
Unallocated	0	[1]	0	[2]
Total allowance for loan and lease losses	96	[1]	96	[2]	98	100
Individually evaluated for impairment	656	[4]	652	[5]
Collectively evaluated for impairment	14,537	[4]	14,253	[5]
Loans acquired with deteriorated credit quality	2	[4]	3	[5]
Total portfolio loans and leases	15,195	[4]	14,908	[5]
Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment	42	[1]	44	[2]
Collectively evaluated for impairment	162	[1]	170	[2]
Unallocated	0	[1]	0	[2]
Total allowance for loan and lease losses	204	[1]	214	[2]	214	217
Individually evaluated for impairment	354	[4]	371	[5]
Collectively evaluated for impairment	19,565	[4]	20,224	[5]
Loans acquired with deteriorated credit quality	0	[4]	0	[5]
Total portfolio loans and leases	19,919	[4]	20,595	[5]
Unallocated
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment	0	[1]	0	[2]
Collectively evaluated for impairment	0	[1]	0	[2]
Unallocated	112	[1]	112	[2]
Total allowance for loan and lease losses	112	[1]	112	[2]	$ 116	$ 115
Individually evaluated for impairment	0	[4]	0	[5]
Collectively evaluated for impairment	0	[4]	0	[5]
Loans acquired with deteriorated credit quality	0	[4]	0	[5]
Total portfolio loans and leases	$ 0	[4]	$ 0	[5]

[1] Includes $ 2 related to leveraged leases at March 31, 2017 .

[2] Includes $ 2 related to leveraged leases at December 31, 2016 .

[3] Includes $ 85 and $ 85 of cash and due from banks, $ 1,015 and $ 1,216 of portfolio loans and leases , $ (25) and $ (26) of ALLL, $ 7 and $ 9 of other assets, $ 2 and $ 3 of other liabilities , and $ 883 and $ 1,094 of long-term debt from consolidated VIEs that are included in their respective captions above at March 31, 2017 and December 31, 2016 , respectively. For further information refer to Note 10 .

[4] Excludes $ 141 of residential mortgage loans measured at fair value, and includes $ 7 03 of leveraged leases, net of unearned income at March 31, 2017 .

[5] Excludes $ 143 of residential mortgage loans measured at fair value, and includes $ 701 of leveraged leases, net of unearned income at December 31, 2016 .

[6] Excludes $ 141 of residential mortgage loans measured at fair value at March 31, 2017 .

[7] Excludes $ 143 of residential mortgage loans measured at fair value at December 31, 2016 .

[8] Includes five restructured loans at March 31, 2017 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 a recorded investment of $ 26 and an ALLL of $ 18 .

[9] Includes five restructured loans at December 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 a recorded investment of $ 26 and an ALLL of $ 18 .