Payment Status for the LHFI Portfolio (Detail) - USD ($) $ in Millions		Jun. 30, 2019		Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		$ 153,656		$ 148,548
Accruing 30-89 Days Past Due		921		1,113
Accruing 90+ Days Past Due		1,476		1,652
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	536	[2]	526	[3]
Total		156,589		151,839
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		72,650		70,901
Accruing 30-89 Days Past Due		49		64
Accruing 90+ Days Past Due		14		15
Financing Receivable, Recorded Investment, Nonaccrual Status		258	[2]	157	[3]
Total	[4]	72,971		71,137
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		8,650		7,259
Accruing 30-89 Days Past Due		3		3
Accruing 90+ Days Past Due		0		1
Financing Receivable, Recorded Investment, Nonaccrual Status		2	[2]	2	[3]
Total		8,655		7,265
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		2,365		2,538
Accruing 30-89 Days Past Due		0		0
Accruing 90+ Days Past Due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status		0	[2]	0	[3]
Total		2,365		2,538
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		83,665		80,698
Accruing 30-89 Days Past Due		52		67
Accruing 90+ Days Past Due		14		16
Financing Receivable, Recorded Investment, Nonaccrual Status		260	[2]	159	[3]
Total		83,991		80,940
Federal National Mortgage Association (FNMA) Insured Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		125		125
Accruing 30-89 Days Past Due		25		39
Accruing 90+ Days Past Due		289		295
Financing Receivable, Recorded Investment, Nonaccrual Status		0	[2],[5]	0	[3],[6]
Total		439		459
Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		28,589	[7]	28,552	[8]
Accruing 30-89 Days Past Due		53	[7]	70	[8]
Accruing 90+ Days Past Due		8	[7]	10	[8]
Financing Receivable, Recorded Investment, Nonaccrual Status		144	[2],[7]	204	[3],[8]
Total	[9],[10]	28,794	[7]	28,836	[8]
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		8,731		9,268
Accruing 30-89 Days Past Due		62		62
Accruing 90+ Days Past Due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status		109	[2]	138	[3]
Total	[9]	8,902		9,468
Residential Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		147		170
Accruing 30-89 Days Past Due		1		3
Accruing 90+ Days Past Due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status		8	[2]	11	[3]
Total	[9]	156		184
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		5,498		5,236
Accruing 30-89 Days Past Due		562		685
Accruing 90+ Days Past Due		1,142		1,308
Financing Receivable, Recorded Investment, Nonaccrual Status		0	[2],[5]	0	[3],[6]
Total		7,200		7,229
Consumer Other Direct [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		11,753		10,559
Accruing 30-89 Days Past Due		50		45
Accruing 90+ Days Past Due		4		4
Financing Receivable, Recorded Investment, Nonaccrual Status		10	[2]	7	[3]
Total		11,817		10,615
Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		13,493		12,286
Accruing 30-89 Days Past Due		99		125
Accruing 90+ Days Past Due		1		1
Financing Receivable, Recorded Investment, Nonaccrual Status		5	[2]	7	[3]
Total		13,598		12,419
Credit Card Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		1,655		1,654
Accruing 30-89 Days Past Due		17		17
Accruing 90+ Days Past Due		18		18
Financing Receivable, Recorded Investment, Nonaccrual Status		0	[2]	0	[3]
Total		1,690		1,689
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		69,991		67,850
Accruing 30-89 Days Past Due		869		1,046
Accruing 90+ Days Past Due		1,462		1,636
Financing Receivable, Recorded Investment, Nonaccrual Status		276	[2]	367	[3]
Total		$ 72,598		$ 70,899

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

[2] Includes nonaccruing LHFI past due 90 days or more of $301 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 $4.1 billion of sales-type, direct financing, and leveraged leases at both June 30, 2019 and December 31, 2018. Includes $862 million and $796 million of installment loans at June 30, 2019 and December 31, 2018, respectively.

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

[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] Includes $127 million of LHFI measured at fair value, the majority of which were accruing current.

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

[9] Excludes $7.2 billion of guaranteed student loans at both June 30, 2019 and December 31, 2018, and $439 million and $459 million of guaranteed residential mortgages at June 30, 2019 and December 31, 2018, respectively, for which there was nominal risk of principal loss due to the government guarantee.

[10] Includes $127 million and $163 million of LHFI measured at fair value at June 30, 2019 and December 31, 2018, respectively.