Payment Status for the LHFI Portfolio (Detail) - USD ($) $ in Millions		Jun. 30, 2018		Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		$ 141,895		$ 139,956
Accruing 30-89 Days Past Due		1,043		1,146
Accruing 90+ Days Past Due		1,242		1,405
Financing Receivable, Recorded Investment, Nonaccrual Status	[2]	755	[1]	674	[3]
Total	[4]	144,935		143,181
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		67,001		66,092
Accruing 30-89 Days Past Due		32		42
Accruing 90+ Days Past Due		14		7
Financing Receivable, Recorded Investment, Nonaccrual Status		296	[1]	215	[3]
Total	[5]	67,343		66,356
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		6,242		5,293
Accruing 30-89 Days Past Due		15		0
Accruing 90+ Days Past Due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status		45	[1]	24	[3]
Total		6,302		5,317
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		3,443		3,803
Accruing 30-89 Days Past Due		13		0
Accruing 90+ Days Past Due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status		0	[1]	1	[3]
Total		3,456		3,804
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		76,686		75,188
Accruing 30-89 Days Past Due		60		42
Accruing 90+ Days Past Due		14		7
Financing Receivable, Recorded Investment, Nonaccrual Status		341	[1]	240	[3]
Total		77,101		75,477
Federal National Mortgage Association (FNMA) Insured Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		157		159
Accruing 30-89 Days Past Due		42		55
Accruing 90+ Days Past Due		326		346
Financing Receivable, Recorded Investment, Nonaccrual Status		0	[1]	0	[3]
Total		525		560
Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		27,256	[6]	26,778	[7]
Accruing 30-89 Days Past Due		53	[6]	148	[7]
Accruing 90+ Days Past Due		7	[6]	4	[7]
Financing Receivable, Recorded Investment, Nonaccrual Status		240	[1],[6]	206	[3],[7]
Total	[8],[9]	27,556	[6]	27,136	[7]
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		9,708		10,348
Accruing 30-89 Days Past Due		60		75
Accruing 90+ Days Past Due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status		150	[1]	203	[3]
Total	[8]	9,918		10,626
Residential Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		205		280
Accruing 30-89 Days Past Due		0		7
Accruing 90+ Days Past Due		2		0
Financing Receivable, Recorded Investment, Nonaccrual Status		10	[1]	11	[3]
Total	[8]	217		298
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		5,320		4,946
Accruing 30-89 Days Past Due		697		659
Accruing 90+ Days Past Due		875		1,028
Financing Receivable, Recorded Investment, Nonaccrual Status		0	[1]	0	[3]
Total		6,892		6,633
Consumer Other Direct [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		9,406		8,679
Accruing 30-89 Days Past Due		30		36
Accruing 90+ Days Past Due		4		7
Financing Receivable, Recorded Investment, Nonaccrual Status		8	[1]	7	[3]
Total		9,448		8,729
Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		11,618		12,022
Accruing 30-89 Days Past Due		88		111
Accruing 90+ Days Past Due		0		0
Financing Receivable, Recorded Investment, Nonaccrual Status		6	[1]	7	[3]
Total		11,712		12,140
Credit Card Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		1,539		1,556
Accruing 30-89 Days Past Due		13		13
Accruing 90+ Days Past Due		14		13
Financing Receivable, Recorded Investment, Nonaccrual Status		0	[1]	0	[3]
Total		1,566		1,582
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		65,209		64,768
Accruing 30-89 Days Past Due		983		1,104
Accruing 90+ Days Past Due		1,228		1,398
Financing Receivable, Recorded Investment, Nonaccrual Status		414	[1]	434	[3]
Total		$ 67,834		$ 67,704

[1] .

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

[3] 3 Guaranteed loans are not placed on nonaccruing regardless of delinquency status because collection of principal and interest is reasonably assured by the government.

[4] Includes loans of consolidated VIEs of $165 million and $179 million at June 30, 2018 and December 31, 2017, respectively.

[5] Includes $3.8 billion and $3.7 billion of lease financing, and $800 million and $778 million of installment loans at June 30, 2018 and December 31, 2017, respectively.

[6] Includes nonaccruing LHFI past due 90 days or more of $363 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.2 Includes $177 million of loans measured at fair value, the majority of which were accruing current.

[7] 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.

[8] Excludes $6.9 billion and $6.6 billion of guaranteed student loans and $525 million and $560 million of guaranteed residential mortgages at June 30, 2018 and December 31, 2017, respectively, for which there was nominal risk of principal loss due to the government guarantee.

[9] Includes $177 million and $196 million of LHFI measured at fair value at June 30, 2018 and December 31, 2017, respectively.