Credit Quality (Summary of the ALLL and Related Loans and Leases Classified by Portfolio Segment) (Detail) - USD ($) $ in Millions	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment	$ 200	[1]	$ 230	[2]
Collectively evaluated for impairment	876	[1]	911	[2]
Unallocated	120	[1]	112	[2]
Total allowance for loan and lease losses	1,196	[3]	1,253	[3]	$ 1,272	$ 1,322
Individually evaluated for impairment	1,545	[4]	1,927	[5]
Collectively evaluated for impairment	90,286	[4]	90,025	[5]
Loans acquired with deteriorated credit quality	2	[4]	3	[5]
Total portfolio loans and leases	91,833	[6]	91,955	[7]
Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment	94	[1]	118	[2],[8]
Collectively evaluated for impairment	659	[1]	713	[2]
Unallocated	0	[1]	0	[2]
Total allowance for loan and lease losses	753	[1]	831	[2]	840	875
Individually evaluated for impairment	560	[4]	904	[5],[8]
Collectively evaluated for impairment	55,835	[4]	55,548	[5]
Loans acquired with deteriorated credit quality	0	[4]	0	[5]
Total portfolio loans and leases	56,395	[4]	56,452	[5]
Residential Portfolio Segment
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment	64	[1]	68	[2]
Collectively evaluated for impairment	25	[1]	28	[2]
Unallocated	0	[1]	0	[2]
Total allowance for loan and lease losses	89	[1]	96	[2]	100	104
Individually evaluated for impairment	665	[4]	652	[5]
Collectively evaluated for impairment	14,787	[4]	14,253	[5]
Loans acquired with deteriorated credit quality	2	[4]	3	[5]
Total portfolio loans and leases	15,454	[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	192	[1]	170	[2]
Unallocated	0	[1]	0	[2]
Total allowance for loan and lease losses	234	[1]	214	[2]	217	237
Individually evaluated for impairment	320	[4]	371	[5]
Collectively evaluated for impairment	19,664	[4]	20,224	[5]
Loans acquired with deteriorated credit quality	0	[4]	0	[5]
Total portfolio loans and leases	19,984	[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	120	[1]	112	[2]
Total allowance for loan and lease losses	120	[1]	112	[2]	$ 115	$ 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 $ 1 related to leveraged leases at December 31, 2017 .

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

[3] Includes $ 0 and $ 85 of cash and due from banks, $ 62 and $ 0 of other short-term investments, $ 1,297 and $ 1,216 of portfolio loans and leases, $ (6) and $ (26) of ALLL, $ 7 and $ 9 of other assets, $ 2 and $ 3 of other liabilities and $ 1,190 and $ 1,094 of long-term debt from consolidated VIEs that are included in their respective captions above at December 31, 2017 and 2016 , respectively. For further information, refer to Note 11 .

[4] Excludes $ 137 of residential mortgage loans measured at fair value, and includes $ 674 of leveraged leases, net of unearned income, at December 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 $ 137 of residential mortgage loans measured at fair value at December 31, 2017 .

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

[8] Includes five restruc tured loans at December 31, 2016 associated with a consolida ted VIE in which the Bancorp had no continuing credit risk due to the risk being assumed by a third party, w ith a recorded investment of $26 and an ALLL of $18 . Refer to Note 11 for further discussion on the deconsolidation of a VIE associated with these loans in the third quarter of 2017.