Payment Status for the LHFI Portfolio (Detail) - USD ($) $ in Millions		Sep. 30, 2017		Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		$ 141,204		$ 140,130
Accruing 30-89 Days Past Due		1,020		1,035
Accruing 90+ Days Past Due		1,343		1,288
Nonaccruing	[2]	697	[1]	845	[3]
Total	[4]	144,264		143,298
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		67,396		68,776
Accruing 30-89 Days Past Due		55		35
Accruing 90+ Days Past Due		15		12
Nonaccruing		292		390
Total	[5]	67,758		69,213
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		5,231		4,988
Accruing 30-89 Days Past Due		1		1
Accruing 90+ Days Past Due		1		0
Nonaccruing		5		7
Total		5,238		4,996
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		3,963		3,998
Accruing 30-89 Days Past Due		0		0
Accruing 90+ Days Past Due		0		0
Nonaccruing		1		17
Total		3,964		4,015
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		76,590		77,762
Accruing 30-89 Days Past Due		56		36
Accruing 90+ Days Past Due		16		12
Nonaccruing		298	[1]	414	[3]
Total		76,960		78,224
Federal National Mortgage Association (FNMA) Insured Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		161		155
Accruing 30-89 Days Past Due		50		55
Accruing 90+ Days Past Due		286		327
Nonaccruing		0		0
Total		497		537
Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		26,802	[6]	25,869	[7]
Accruing 30-89 Days Past Due		73	[6]	84	[7]
Accruing 90+ Days Past Due		5	[6]	7	[7]
Nonaccruing		161		177
Total	[8],[9]	27,041	[6]	26,137	[7]
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		10,559		11,596
Accruing 30-89 Days Past Due		92		81
Accruing 90+ Days Past Due		0		0
Nonaccruing		214		235
Total	[8]	10,865		11,912
Residential Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		315		389
Accruing 30-89 Days Past Due		1		3
Accruing 90+ Days Past Due		0		0
Nonaccruing		11		12
Total	[8]	327		404
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		37,837		38,009
Accruing 30-89 Days Past Due		216		223
Accruing 90+ Days Past Due		291		334
Nonaccruing		386	[1]	424	[3]
Total		38,730		38,990
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		4,974		4,637
Accruing 30-89 Days Past Due		567		603
Accruing 90+ Days Past Due		1,018		927
Nonaccruing		0		0
Total		6,559		6,167
Consumer Other Direct [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		8,547		7,726
Accruing 30-89 Days Past Due		38		35
Accruing 90+ Days Past Due		6		4
Nonaccruing		6		6
Total	[10]	8,597		7,771
Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		11,815		10,608
Accruing 30-89 Days Past Due		130		126
Accruing 90+ Days Past Due		0		1
Nonaccruing		7		1
Total	[10]	11,952		10,736
Credit Card Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		1,441		1,388
Accruing 30-89 Days Past Due		13		12
Accruing 90+ Days Past Due		12		10
Nonaccruing		0		0
Total	[10]	1,466		1,410
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		26,777		24,359
Accruing 30-89 Days Past Due		748		776
Accruing 90+ Days Past Due		1,036		942
Nonaccruing		13	[1]	7	[3]
Total		$ 28,574		$ 26,084

[1] Nonaccruing loans past due 90 days or more totaled $333 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 $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.

[4] Includes loans of consolidated VIEs of $186 million and $211 million at September 30, 2017 and December 31, 2016, respectively.

[5] Includes $3.5 billion and $3.7 billion of lease financing and $764 million and $729 million of installment loans at September 30, 2017 and December 31, 2016, respectively.

[6] Includes $206 million of loans measured at fair value, the majority of which were accruing current.

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

[8] Excludes $497 million and $537 million of guaranteed residential loans at September 30, 2017 and December 31, 2016, respectively.

[9] Includes $206 million and $222 million of LHFI measured at fair value at September 30, 2017 and December 31, 2016, respectively.

[10] Excludes $6.6 billion and $6.2 billion of guaranteed student loans at September 30, 2017 and December 31, 2016, respectively.