Credit Quality (Summary of the ALLL and Related Loans and Leases Classified by Portfolio Segment) (Detail) - USD ($) $ in Millions	Sep. 30, 2016		Jun. 30, 2016	Dec. 31, 2015		Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment	$ 207	[1]		$ 235	[2]
Collectively evaluated for impairment	950	[1]		922	[2]
Unallocated	115	[1]		115	[2]
Total allowance for loan and lease losses	1,272	[1],[3]	$ 1,299	1,272	[2],[3]	$ 1,261	$ 1,293	$ 1,322
Individually evaluated for impairment	1,941	[4]		1,869	[5]
Collectively evaluated for impairment	91,058	[4]		90,544	[5]
Loans acquired with deteriorated credit quality	3	[4]		2	[5]
Total portfolio loans and leases	93,002	[4],[6]		92,415	[5],[7]
Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment	96	[1],[8]		119	[2],[9]
Collectively evaluated for impairment	758	[1]		721	[2]
Unallocated	0	[1]		0	[2]
Total allowance for loan and lease losses	854	[1]	873	840	[2]	828	855	875
Individually evaluated for impairment	906	[4],[8]		815	[5],[9]
Collectively evaluated for impairment	56,577	[4]		55,341	[5]
Loans acquired with deteriorated credit quality	0	[4]		0	[5]
Total portfolio loans and leases	57,483	[4]		56,156	[5]
Residential Mortgage Loans
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment	68	[1]		67	[2]
Collectively evaluated for impairment	28	[1]		33	[2]
Unallocated	0	[1]		0	[2]
Total allowance for loan and lease losses	96	[1]	98	100	[2]	98	104	104
Individually evaluated for impairment	651	[4]		630	[5]
Collectively evaluated for impairment	13,840	[4]		12,917	[5]
Loans acquired with deteriorated credit quality	3	[4]		2	[5]
Total portfolio loans and leases	14,494	[4]		13,549	[5]
Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment	43	[1]		49	[2]
Collectively evaluated for impairment	164	[1]		168	[2]
Unallocated	0	[1]		0	[2]
Total allowance for loan and lease losses	207	[1]	211	217	[2]	221	231	237
Individually evaluated for impairment	384	[4]		424	[5]
Collectively evaluated for impairment	20,641	[4]		22,286	[5]
Loans acquired with deteriorated credit quality	0	[4]		0	[5]
Total portfolio loans and leases	21,025	[4]		22,710	[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	115	[1]		115	[2]
Total allowance for loan and lease losses	115	[1]	$ 117	115	[2]	$ 114	$ 103	$ 106
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 September 30, 2016 .

[2] Includes $ 5 related to leveraged leases at December 31, 2015 .

[3] Includes $ 112 and $ 152 of cash and due from banks, $ 1,560 and $ 2,537 of portfolio loans and leases , $ (28) and $ (28) of ALLL, $ 11 and $ 14 of other assets, $ 3 and $ 3 of other liabilities , and $ 1,422 and $ 2,487 of long-term debt from consolidated VIEs that are included in their respective captions above at September 30, 2016 and December 31, 2015 , respectively. For further information refer to Note 10 .

[4] Excludes $ 149 of residential mortgage loans measured at fair value, and includes $ 72 5 of leveraged leases, net of unearned income at September 30, 2016 .

[5] Excludes $ 167 of residential mortgage loans measured at fair value, and includes $ 801 of leveraged leases, net of unearned income at December 31, 2015 .

[6] Excludes $ 149 of residential mortgage loans measured at fair value at September 30, 2016 .

[7] Excludes $ 167 of residential mortgage loans measured at fair value at December 31, 2015 .

[8] Includes five restructured loans at September 30, 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 $ 27 and an ALLL of $ 18 .

[9] Includes five restructured loans at December 31, 2015 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 $ 27 and an ALLL of $ 15 .