Summary of the ALLL and Related Loans and Leases Classified by Portfolio Segment (Detail) - USD ($) $ in Millions	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$ 235	[1]	$ 305	[2]
Collectively evaluated for impairment	922	[1]	911	[2]
Unallocated	115	[1]	106	[2]
Total allowance for loan and lease losses	1,272	[3]	1,322	[3]	$ 1,582	$ 1,854
Individually evaluated for impairment	1,869	[4]	2,261	[5]
Collectively evaluated for impairment	90,544	[4]	87,713	[5]
Loans acquired with deteriorated credit quality	2	[4]	2	[5]
Total loans and leases	92,415	[6]	89,976	[7]
Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	119	[1],[8]	179	[2],[9]
Collectively evaluated for impairment	721	[1]	696	[2]
Total allowance for loan and lease losses	840		875	[2]	1,058	1,236
Individually evaluated for impairment	815	[4],[8]	1,260	[5],[9]
Collectively evaluated for impairment	55,341	[4]	52,693	[5]
Total loans and leases	56,156	[4]	53,953	[5]
Residential Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	67	[1]	65	[2]
Collectively evaluated for impairment	33	[1]	39	[2]
Total allowance for loan and lease losses	100		104	[2]	189	229
Individually evaluated for impairment	630	[4]	518	[5]
Collectively evaluated for impairment	12,917	[4]	11,761	[5]
Loans acquired with deteriorated credit quality	2	[4]	2	[5]
Total loans and leases	13,549	[4]	12,281	[5]
Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	49	[1]	61	[2]
Collectively evaluated for impairment	168	[1]	176	[2]
Total allowance for loan and lease losses	217		237	[2]	225	278
Individually evaluated for impairment	424	[4]	483	[5]
Collectively evaluated for impairment	22,286	[4]	23,259	[5]
Total loans and leases	22,710	[4]	23,742	[5]
Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Unallocated	115	[1]	106	[2]
Total allowance for loan and lease losses	$ 115		$ 106	[2]	$ 110	$ 111

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

[2] Includes $6 related to leveraged leases at December 31, 2014.

[3] Includes $152 and $179 of cash and due from banks, $2,537 and $3,378 of portfolio loans and leases, $(28) and $(22) of ALLL, $20 and $25 of other assets, $3 and $5 of other liabilities and $2,493 and $3,434 of long-term debt from consolidated VIEs that are included in their respective captions above at December 31, 2015 and 2014, respectively. For further information, refer to Note 11.

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

[5] Excludes $108 of residential mortgage loans measured at fair value and includes $874 of leveraged leases, net of unearned income, at December 31, 2014.

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

[7] Excludes $108 of residential mortgage loans measured at fair value at December 31, 2014.

[8] 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.

[9] Includes five restructured loans at December 31, 2014 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 $28 and an ALLL of $10.