Payment Status for the LHFI Portfolio (Detail) - USD ($) $ in Millions		Mar. 31, 2019		Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		$ 152,065		$ 148,548
Accruing 30-89 Days Past Due		987		1,113
Accruing 90+ Days Past Due		1,659		1,652
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	522	[2]	526	[3]
Total	[4]	155,233		151,839
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		73,016		70,901
Accruing 30-89 Days Past Due		49		64
Accruing 90+ Days Past Due		16		15
Financing Receivable, Recorded Investment, Nonaccrual Status		197	[2]	157	[3]
Total	[5]	73,278		71,137
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		7,885		7,259
Accruing 30-89 Days Past Due		2		3
Accruing 90+ Days Past Due		0		1
Financing Receivable, Recorded Investment, Nonaccrual Status		2	[2]	2	[3]
Total		7,889		7,265
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		2,561		2,538
Accruing 30-89 Days Past Due		1		0
Accruing 90+ Days Past Due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status		0	[2]	0	[3]
Total		2,562		2,538
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		83,462		80,698
Accruing 30-89 Days Past Due		52		67
Accruing 90+ Days Past Due		16		16
Financing Receivable, Recorded Investment, Nonaccrual Status		199	[2]	159	[3]
Total		83,729		80,940
Federal National Mortgage Association (FNMA) Insured Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		141		125
Accruing 30-89 Days Past Due		35		39
Accruing 90+ Days Past Due		291		295
Financing Receivable, Recorded Investment, Nonaccrual Status		0	[2],[6]	0	[3],[7]
Total		467		459
Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		28,215	[8]	28,552	[9]
Accruing 30-89 Days Past Due		50	[8]	70	[9]
Accruing 90+ Days Past Due		18	[8]	10	[9]
Financing Receivable, Recorded Investment, Nonaccrual Status		178	[2],[8]	204	[3],[9]
Total	[10],[11]	28,461	[8]	28,836	[9]
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		8,983		9,268
Accruing 30-89 Days Past Due		60		62
Accruing 90+ Days Past Due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status		124	[2]	138	[3]
Total	[10]	9,167		9,468
Residential Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		158		170
Accruing 30-89 Days Past Due		0		3
Accruing 90+ Days Past Due		1		0
Financing Receivable, Recorded Investment, Nonaccrual Status		8	[2]	11	[3]
Total	[10]	167		184
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		5,350		5,236
Accruing 30-89 Days Past Due		648		685
Accruing 90+ Days Past Due		1,310		1,308
Financing Receivable, Recorded Investment, Nonaccrual Status		0	[2],[6]	0	[3],[7]
Total		7,300		7,200
Consumer Other Direct [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		10,970		10,559
Accruing 30-89 Days Past Due		47		45
Accruing 90+ Days Past Due		4		4
Financing Receivable, Recorded Investment, Nonaccrual Status		8	[2]	7	[3]
Total		11,029		10,615
Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		13,183		12,286
Accruing 30-89 Days Past Due		79		125
Accruing 90+ Days Past Due		1		1
Financing Receivable, Recorded Investment, Nonaccrual Status		5	[2]	7	[3]
Total		13,268		12,419
Credit Card Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		1,603		1,654
Accruing 30-89 Days Past Due		16		17
Accruing 90+ Days Past Due		18		18
Financing Receivable, Recorded Investment, Nonaccrual Status		0	[2]	0	[3]
Total		1,637		1,689
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		68,603		67,850
Accruing 30-89 Days Past Due		935		1,046
Accruing 90+ Days Past Due		1,643		1,636
Financing Receivable, Recorded Investment, Nonaccrual Status		323	[2]	367	[3]
Total		$ 71,504		$ 70,899

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

[2] Includes nonaccruing LHFI past due 90 days or more of $296 million. Nonaccruing LHFI past due fewer than 90 days include nonaccrual LHFI modified in TDRs, performing second lien LHFI where the first lien loan is nonperforming, and certain energy-related commercial LHFI.

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

[4] Includes loans of consolidated VIEs of $147 million and $153 million at March 31, 2019 and December 31, 2018, respectively.

[5] Includes $4.1 billion of sales-type and direct financing leases at both March 31, 2019 and December 31, 2018, and $786 million and $796 million of installment loans at March 31, 2019 and December 31, 2018, respectively.

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

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

[8] Includes $134 million of LHFI measured at fair value, the majority of which were accruing current.

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

[10] Excludes $7.3 billion and $7.2 billion of guaranteed student loans and $467 million and $459 million of guaranteed residential mortgages at March 31, 2019 and December 31, 2018, respectively, for which there was nominal risk of principal loss due to the government guarantee.

[11] Includes $134 million and $163 million of LHFI measured at fair value at March 31, 2019 and December 31, 2018, respectively.