Payment Status for the LHFI Portfolio (Detail) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Document Period End Date		Jun. 30, 2016
Accruing Current		$ 138,843	$ 133,836
Accruing 30-89 Days Past Due		828	953
Accruing 90+ Days Past Due		1,041	981
Nonaccruing	[1],[2]	944	672
Total	[3]	141,656	136,442
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		68,059	66,670
Accruing 30-89 Days Past Due		32	61
Accruing 90+ Days Past Due		21	23
Nonaccruing		491	308
Total		68,603	67,062
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		6,216	6,222
Accruing 30-89 Days Past Due		2	3
Accruing 90+ Days Past Due		0	0
Nonaccruing		10	11
Total		6,228	6,236
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total		6,228	6,236
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		2,615	1,952
Accruing 30-89 Days Past Due		0	0
Accruing 90+ Days Past Due		0	2
Nonaccruing		2	0
Total		2,617	1,954
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		76,890	74,844
Accruing 30-89 Days Past Due		34	64
Accruing 90+ Days Past Due		21	25
Nonaccruing	[1]	503	319
Total		77,448	75,252
Federal National Mortgage Association (FNMA) Insured Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		156	192
Accruing 30-89 Days Past Due		53	59
Accruing 90+ Days Past Due		325	378
Nonaccruing		0	0
Total		534	629
Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	[4]	25,753	24,449
Accruing 30-89 Days Past Due	[4]	80	105
Accruing 90+ Days Past Due	[4]	10	7
Nonaccruing		194	183
Total	[4],[5]	26,037	24,744
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		12,175	12,939
Accruing 30-89 Days Past Due		80	87
Accruing 90+ Days Past Due		0	0
Nonaccruing		226	145
Total	[5]	12,481	13,171
Residential Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		384	365
Accruing 30-89 Days Past Due		0	3
Accruing 90+ Days Past Due		0	0
Nonaccruing		13	16
Total	[5]	397	384
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		38,468	37,945
Accruing 30-89 Days Past Due		213	254
Accruing 90+ Days Past Due		335	385
Nonaccruing	[1]	433	344
Total		39,449	38,928
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		4,427	3,861
Accruing 30-89 Days Past Due		462	500
Accruing 90+ Days Past Due		673	561
Nonaccruing		0	0
Total		5,562	4,922
Consumer Other Direct [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		6,794	6,094
Accruing 30-89 Days Past Due		22	24
Accruing 90+ Days Past Due		4	3
Nonaccruing		5	6
Total	[6]	6,825	6,127
Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		11,102	10,022
Accruing 30-89 Days Past Due		89	102
Accruing 90+ Days Past Due		1	0
Nonaccruing		3	3
Total	[6]	11,195	10,127
Credit Card Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		1,162	1,070
Accruing 30-89 Days Past Due		8	9
Accruing 90+ Days Past Due		7	7
Nonaccruing		0	0
Total	[6]	1,177	1,086
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		23,485	21,047
Accruing 30-89 Days Past Due		581	635
Accruing 90+ Days Past Due		685	571
Nonaccruing	[1]	8	9
Total		$ 24,759	$ 22,262

[1] Nonaccruing loans past due 90 days or more totaled $305 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 $227 million and $246 million at June 30, 2016 and December 31, 2015, respectively.

[4] Includes $246 million of loans measured at fair value, the majority of which were accruing current.

[5] Excludes $534 million and $629 million of guaranteed residential loans at June 30, 2016 and December 31, 2015, respectively.

[6] Excludes $5.6 billion and $4.9 billion of guaranteed student loans at June 30, 2016 and December 31, 2015, respectively.