Payment Status for the LHFI Portfolio (Detail) - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		$ 133,836	$ 130,575
Accruing 30-89 Days Past Due		953	846
Accruing 90+ Days Past Due		981	1,057
Nonaccruing	[1],[2]	672	634
Total	[3]	136,442	133,112
Commercial and Industrial Sector [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		66,670	65,246
Accruing 30-89 Days Past Due		61	36
Accruing 90+ Days Past Due		23	7
Nonaccruing		308	151
Total		67,062	65,440
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		6,222	6,716
Accruing 30-89 Days Past Due		3	3
Accruing 90+ Days Past Due		0	1
Nonaccruing		11	21
Total		6,236	6,741
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total		6,236	6,741
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		1,952	1,209
Accruing 30-89 Days Past Due		0	1
Accruing 90+ Days Past Due		2	0
Nonaccruing		0	1
Total		1,954	1,211
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		74,844	73,171
Accruing 30-89 Days Past Due		64	40
Accruing 90+ Days Past Due		25	8
Nonaccruing	[1]	319	173
Total		75,252	73,392
Federal National Mortgage Association (FNMA) Insured Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		192	176
Accruing 30-89 Days Past Due		59	34
Accruing 90+ Days Past Due		378	422
Nonaccruing		0	0
Total		629	632
Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	[4]	24,449	23,067
Accruing 30-89 Days Past Due	[4]	105	108
Accruing 90+ Days Past Due	[4]	7	14
Nonaccruing		183	254
Total	[4],[5]	24,744	23,443
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		12,939	13,989
Accruing 30-89 Days Past Due		87	101
Accruing 90+ Days Past Due		0	0
Nonaccruing		145	174
Total	[5]	13,171	14,264
Residential Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		365	402
Accruing 30-89 Days Past Due		3	7
Accruing 90+ Days Past Due		0	0
Nonaccruing		16	27
Total	[5]	384	436
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		37,945	37,634
Accruing 30-89 Days Past Due		254	250
Accruing 90+ Days Past Due		385	436
Nonaccruing	[1]	344	455
Total		38,928	38,775
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		3,861	3,801
Accruing 30-89 Days Past Due		500	425
Accruing 90+ Days Past Due		561	601
Nonaccruing		0	0
Total		4,922	4,827
Consumer Other Direct [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		6,094	4,545
Accruing 30-89 Days Past Due		24	19
Accruing 90+ Days Past Due		3	3
Nonaccruing		6	6
Total	[6]	6,127	4,573
Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		10,022	10,537
Accruing 30-89 Days Past Due		102	104
Accruing 90+ Days Past Due		0	3
Nonaccruing		3	0
Total	[6]	10,127	10,644
Credit Card Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		1,070	887
Accruing 30-89 Days Past Due		9	8
Accruing 90+ Days Past Due		7	6
Nonaccruing		0	0
Total	[6]	1,086	901
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current		21,047	19,770
Accruing 30-89 Days Past Due		635	556
Accruing 90+ Days Past Due		571	613
Nonaccruing	[1]	9	6
Total		$ 22,262	$ 20,945

[1] 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, 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 $246 million and $288 million at December 31, 2015 and December 31, 2014, respectively.

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

[5] Excludes $629 million and $632 million of guaranteed residential loans at December 31, 2015 and 2014, respectively.

[6] Excludes $4.9 billion and $4.8 billion of guaranteed student loans at December 31, 2015 and 2014, respectively.