Payment Status for the LHFI Portfolio (Detail) - USD ($) $ in Millions		Dec. 31, 2018		Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		$ 148,548		$ 139,956
Accruing 30-89 Days Past Due		1,113		1,146
Accruing 90+ Days Past Due		1,652		1,405
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	526	[2]	674	[3]
Total	[4]	151,839		143,181
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		70,901		66,092
Accruing 30-89 Days Past Due		64		42
Accruing 90+ Days Past Due		15		7
Financing Receivable, Recorded Investment, Nonaccrual Status		157	[2]	215	[3]
Total	[5]	71,137		66,356
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		7,259		5,293
Accruing 30-89 Days Past Due		3		0
Accruing 90+ Days Past Due		1		0
Financing Receivable, Recorded Investment, Nonaccrual Status		2	[2]	24	[3]
Total		7,265		5,317
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		2,538		3,803
Accruing 30-89 Days Past Due		0		0
Accruing 90+ Days Past Due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status		0	[2]	1	[3]
Total		2,538		3,804
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		80,698		75,188
Accruing 30-89 Days Past Due		67		42
Accruing 90+ Days Past Due		16		7
Financing Receivable, Recorded Investment, Nonaccrual Status		159	[2]	240	[3]
Total		80,940		75,477
Federal National Mortgage Association (FNMA) Insured Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		125		159
Accruing 30-89 Days Past Due		39		55
Accruing 90+ Days Past Due		295		346
Financing Receivable, Recorded Investment, Nonaccrual Status		0	[2],[6]	0	[3]
Total		459		560
Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		28,552	[7]	26,778	[8]
Accruing 30-89 Days Past Due		70	[7]	148	[8]
Accruing 90+ Days Past Due		10	[7]	4	[8]
Financing Receivable, Recorded Investment, Nonaccrual Status		204	[2],[7]	206	[3],[8]
Total	[9],[10]	28,836	[7]	27,136	[8]
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		9,268		10,348
Accruing 30-89 Days Past Due		62		75
Accruing 90+ Days Past Due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status		138	[2]	203	[3]
Total	[9]	9,468		10,626
Residential Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		170		280
Accruing 30-89 Days Past Due		3		7
Accruing 90+ Days Past Due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status		11	[2]	11	[3]
Total	[9]	184		298
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		5,236		4,946
Accruing 30-89 Days Past Due		685		659
Accruing 90+ Days Past Due		1,308		1,028
Financing Receivable, Recorded Investment, Nonaccrual Status		0	[2],[6]	0	[3],[11]
Total		7,229		6,600
Consumer Other Direct [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		10,559		8,679
Accruing 30-89 Days Past Due		45		36
Accruing 90+ Days Past Due		4		7
Financing Receivable, Recorded Investment, Nonaccrual Status		7	[2]	7	[3]
Total		10,615		8,729
Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		12,286		12,022
Accruing 30-89 Days Past Due		125		111
Accruing 90+ Days Past Due		1		0
Financing Receivable, Recorded Investment, Nonaccrual Status		7	[2]	7	[3]
Total		12,419		12,140
Credit Card Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		1,654		1,556
Accruing 30-89 Days Past Due		17		13
Accruing 90+ Days Past Due		18		13
Financing Receivable, Recorded Investment, Nonaccrual Status		0	[2]	0	[3]
Total		1,689		1,582
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		67,850		64,768
Accruing 30-89 Days Past Due		1,046		1,104
Accruing 90+ Days Past Due		1,636		1,398
Financing Receivable, Recorded Investment, Nonaccrual Status		367	[2]	434	[3]
Total		$ 70,899		$ 67,704

[1] Nonaccruing restructured loans are included in total nonaccrual loans/NPLs.

[2] Includes nonaccruing LHFI past due 90 days or more of $306 million. Nonaccruing LHFI past due fewer than 90 days include nonaccrual loans modified in TDRs, performing second lien loans where the first lien loan is nonperforming, and certain energy-related commercial loans.

[3] Includes nonaccruing LHFI past due 90 days or more of $357 million. Nonaccruing LHFI past due fewer than 90 days include nonaccrual loans modified in TDRs, performing second lien loans where the first lien loan is nonperforming, and certain energy-related commercial loans.

[4] Includes loans of consolidated VIEs of $153 million and $179 million at December?31, 2018 and December?31, 2017, respectively.

[5] Includes $4.1 billion and $3.7 billion of lease financing, and $796 million and $778 million of installment loans at December 31, 2018 and 2017, respectively.

[6] Guaranteed loans are not placed on nonaccrual status regardless of delinquency because collection of principal and interest is reasonably assured by the government.

[7] Includes $163 million of loans measured at fair value, the majority of which were accruing current.

[8] Includes $196 million of loans measured at fair value, the majority of which were accruing current.

[9] Excludes $7.2 billion and $6.6 billion of guaranteed student loans and $459 million and $560 million of guaranteed residential mortgages at December 31, 2018 and 2017, respectively, for which there was nominal risk of principal loss due to the government guarantee.

[10] Includes $163 million and $196 million of LHFI measured at fair value at December 31, 2018 and 2017, respectively.

[11] Guaranteed loans are not placed on nonaccrual status regardless of delinquency because collection of principal and interest is reasonably assured by the government.