Payment Status for the LHFI Portfolio (Detail) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		$ 131,381	$ 130,575
Accruing 30-89 Days Past Due		811	846
Accruing 90+ Days Past Due		905	1,057
Nonaccruing	[1],[2]	463	634
Total	[3]	133,560	133,112
Commercial and Industrial Sector [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		65,148	65,246
Accruing 30-89 Days Past Due		89	36
Accruing 90+ Days Past Due		12	7
Nonaccruing		122	151
Total		65,371	65,440
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		6,150	6,716
Accruing 30-89 Days Past Due		2	3
Accruing 90+ Days Past Due		1	1
Nonaccruing		15	21
Total		6,168	6,741
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total		6,168	6,741
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		73,060	73,171
Accruing 30-89 Days Past Due		91	40
Accruing 90+ Days Past Due		13	8
Nonaccruing	[1]	138	173
Total		73,302	73,392
Federal National Mortgage Association (FNMA) Insured Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		200	176
Accruing 30-89 Days Past Due		51	34
Accruing 90+ Days Past Due		376	422
Nonaccruing		0	0
Total		627	632
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		1,762	1,209
Accruing 30-89 Days Past Due		0	1
Accruing 90+ Days Past Due		0	0
Nonaccruing		1	1
Total		1,763	1,211
Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	[4]	24,081	23,067
Accruing 30-89 Days Past Due	[4]	105	108
Accruing 90+ Days Past Due	[4]	9	14
Nonaccruing		156	254
Total	[4],[5]	24,351	23,443
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		37,845	37,634
Accruing 30-89 Days Past Due		240	250
Accruing 90+ Days Past Due		385	436
Nonaccruing	[1]	318	455
Total		38,788	38,775
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		13,189	13,989
Accruing 30-89 Days Past Due		81	101
Accruing 90+ Days Past Due		0	0
Nonaccruing		146	174
Total	[5]	13,416	14,264
Residential Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		375	402
Accruing 30-89 Days Past Due		3	7
Accruing 90+ Days Past Due		0	0
Nonaccruing		16	27
Total	[5]	394	436
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		3,724	3,801
Accruing 30-89 Days Past Due		367	425
Accruing 90+ Days Past Due		497	601
Nonaccruing		0	0
Total		4,588	4,827
Consumer Other Direct [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		5,742	4,545
Accruing 30-89 Days Past Due		22	19
Accruing 90+ Days Past Due		3	3
Nonaccruing		4	6
Total	[6]	5,771	4,573
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		20,476	19,770
Accruing 30-89 Days Past Due		480	556
Accruing 90+ Days Past Due		507	613
Nonaccruing	[1]	7	6
Total		21,470	20,945
Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		10,032	10,537
Accruing 30-89 Days Past Due		83	104
Accruing 90+ Days Past Due		1	3
Nonaccruing		3	0
Total	[6]	10,119	10,644
Credit Card Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		978	887
Accruing 30-89 Days Past Due		8	8
Accruing 90+ Days Past Due		6	6
Nonaccruing		0	0
Total	[6]	$ 992	$ 901

[1] Nonaccruing loans past due 90 days or more totaled $278 million. Nonaccruing loans past due fewer than 90 days include modified nonaccrual loans reported as TDRs and performing second lien loans which are classified as nonaccrual when the first lien loan is nonperforming.

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

[3] Includes loans of consolidated VIEs of $256 million and $288 million at September 30, 2015 and December 31, 2014, respectively.

[4] Includes $262 million of loans measured at fair value, the majority of which were accruing current.

[5] Excludes $627 million and $632 million of guaranteed residential loans at September 30, 2015 and December 31, 2014, respectively.

[6] Excludes $4.6 billion and $4.8 billion of guaranteed student loans at September 30, 2015 and December 31, 2014, respectively.