Payment Status for the LHFI Portfolio (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Document Period End Date		Mar. 31, 2016
Accruing Current		$ 136,839	$ 133,836
Accruing 30-89 Days Past Due		936	953
Accruing 90+ Days Past Due		996	981
Nonaccruing	[1],[2]	975	672
Total	[3]	139,746	136,442
Commercial and Industrial Sector [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		68,274	66,670
Accruing 30-89 Days Past Due		110	61
Accruing 90+ Days Past Due		14	23
Nonaccruing		565	308
Total		68,963	67,062
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		6,020	6,222
Accruing 30-89 Days Past Due		4	3
Accruing 90+ Days Past Due		0	0
Nonaccruing		10	11
Total		6,034	6,236
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total		6,034	6,236
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		2,496	1,952
Accruing 30-89 Days Past Due		0	0
Accruing 90+ Days Past Due		0	2
Nonaccruing		2	0
Total		2,498	1,954
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		76,790	74,844
Accruing 30-89 Days Past Due		114	64
Accruing 90+ Days Past Due		14	25
Nonaccruing	[1]	577	319
Total		77,495	75,252
Federal National Mortgage Association (FNMA) Insured Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		200	192
Accruing 30-89 Days Past Due		51	59
Accruing 90+ Days Past Due		372	378
Nonaccruing		0	0
Total		623	629
Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	[4]	24,852	24,449
Accruing 30-89 Days Past Due	[4]	89	105
Accruing 90+ Days Past Due	[4]	9	7
Nonaccruing		198	183
Total	[4],[5]	25,148	24,744
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		12,589	12,939
Accruing 30-89 Days Past Due		76	87
Accruing 90+ Days Past Due		0	0
Nonaccruing		180	145
Total	[5]	12,845	13,171
Residential Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		369	365
Accruing 30-89 Days Past Due		2	3
Accruing 90+ Days Past Due		0	0
Nonaccruing		12	16
Total	[5]	383	384
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		38,010	37,945
Accruing 30-89 Days Past Due		218	254
Accruing 90+ Days Past Due		381	385
Nonaccruing	[1]	390	344
Total		38,999	38,928
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		4,182	3,861
Accruing 30-89 Days Past Due		493	500
Accruing 90+ Days Past Due		590	561
Nonaccruing		0	0
Total		5,265	4,922
Consumer Other Direct [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		6,338	6,094
Accruing 30-89 Days Past Due		26	24
Accruing 90+ Days Past Due		3	3
Nonaccruing		5	6
Total	[6]	6,372	6,127
Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		10,442	10,022
Accruing 30-89 Days Past Due		77	102
Accruing 90+ Days Past Due		0	0
Nonaccruing		3	3
Total	[6]	10,522	10,127
Credit Card Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		1,077	1,070
Accruing 30-89 Days Past Due		8	9
Accruing 90+ Days Past Due		8	7
Nonaccruing		0	0
Total	[6]	1,093	1,086
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		22,039	21,047
Accruing 30-89 Days Past Due		604	635
Accruing 90+ Days Past Due		601	571
Nonaccruing	[1]	8	9
Total		$ 23,252	$ 22,262

[1] Nonaccruing loans past due 90 days or more totaled $332 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] Includes loans of consolidated VIEs of $237 million and $246 million at March 31, 2016 and December 31, 2015, respectively.

[4] Includes $255 million of loans measured at fair value, the majority of which were accruing current.

[5] Excludes $623 million and $629 million of guaranteed residential loans at March 31, 2016 and December 31, 2015, respectively.

[6] Excludes $5.3 billion and $4.9 billion of guaranteed student loans at March 31, 2016 and December 31, 2015, respectively.