Payment Status for the LHFI Portfolio (Detail) - USD ($) $ in Millions		Dec. 31, 2016		Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		$ 140,130		$ 133,836
Accruing 30-89 Days Past Due		1,035		953
Accruing 90+ Days Past Due		1,288		981
Nonaccruing	[2]	845	[1]	672	[3]
Total	[4]	143,298		136,442
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		68,776		66,670
Accruing 30-89 Days Past Due		35		61
Accruing 90+ Days Past Due		12		23
Nonaccruing		390		308
Total		69,213		67,062
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		4,988		6,222
Accruing 30-89 Days Past Due		1		3
Accruing 90+ Days Past Due		0		0
Nonaccruing		7		11
Total		4,996		6,236
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total		4,996		6,236
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		3,998		1,952
Accruing 30-89 Days Past Due		0		0
Accruing 90+ Days Past Due		0		2
Nonaccruing		17		0
Total		4,015		1,954
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		77,762		74,844
Accruing 30-89 Days Past Due		36		64
Accruing 90+ Days Past Due		12		25
Nonaccruing		414	[1]	319	[3]
Total		78,224		75,252
Federal National Mortgage Association (FNMA) Insured Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		155		192
Accruing 30-89 Days Past Due		55		59
Accruing 90+ Days Past Due		327		378
Nonaccruing		0		0
Total		537		629
Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		25,869	[5]	24,449	[6]
Accruing 30-89 Days Past Due		84	[5]	105	[6]
Accruing 90+ Days Past Due		7	[5]	7	[6]
Nonaccruing		177		183
Total	[7]	26,137	[5]	24,744	[6]
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		11,596		12,939
Accruing 30-89 Days Past Due		81		87
Accruing 90+ Days Past Due		0		0
Nonaccruing		235		145
Total	[7]	11,912		13,171
Residential Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		389		365
Accruing 30-89 Days Past Due		3		3
Accruing 90+ Days Past Due		0		0
Nonaccruing		12		16
Total	[7]	404		384
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		38,009		37,945
Accruing 30-89 Days Past Due		223		254
Accruing 90+ Days Past Due		334		385
Nonaccruing		424	[1]	344	[3]
Total		38,990		38,928
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		4,637		3,861
Accruing 30-89 Days Past Due		603		500
Accruing 90+ Days Past Due		927		561
Nonaccruing		0		0
Total		6,167		4,922
Consumer Other Direct [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		7,726		6,094
Accruing 30-89 Days Past Due		35		24
Accruing 90+ Days Past Due		4		3
Nonaccruing		6		6
Total	[8]	7,771		6,127
Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		10,608		10,022
Accruing 30-89 Days Past Due		126		102
Accruing 90+ Days Past Due		1		0
Nonaccruing		1		3
Total	[8]	10,736		10,127
Credit Card Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		1,388		1,070
Accruing 30-89 Days Past Due		12		9
Accruing 90+ Days Past Due		10		7
Nonaccruing		0		0
Total	[8]	1,410		1,086
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		24,359		21,047
Accruing 30-89 Days Past Due		776		635
Accruing 90+ Days Past Due		942		571
Nonaccruing		7	[1]	9	[3]
Total		$ 26,084		$ 22,262

[1] Nonaccruing loans past due 90 days or more totaled $360 million. Nonaccruing loans past due fewer than 90 days include modified nonaccrual loans reported as TDRs, performing second lien loans where the first lien loan is nonperforming, and certain energy-related commercial loans.

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

[3] Nonaccruing loans past due 90 days or more totaled $336 million. Nonaccruing loans past due fewer than 90 days include modified nonaccrual loans reported as TDRs and performing second lien loans where the first lien loan is nonperforming, and certain energy-related commercial loans.

[4] Includes loans of consolidated VIEs of $211 million and $246 million at December 31, 2016 and December 31, 2015, respectively.

[5] Includes $222 million of loans measured at fair value, the majority of which were accruing current.

[6] Includes $257 million of loans measured at fair value, the majority of which were accruing current.

[7] Excludes $537 million and $629 million of guaranteed residential loans at December 31, 2016 and 2015, respectively.

[8] Excludes $6.2 billion and $4.9 billion of guaranteed student loans at December 31, 2016 and 2015, respectively.