Payment Status for the LHFI Portfolio (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	$ 117,573		$ 118,008
Accruing 30-89 Days Past Due	941		1,133
Accruing 90+ Days Past Due	823		782
Nonaccruing	1,467	[1]	1,547	[2]
Total	120,804	[3]	121,470	[3]
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	54,343		54,048
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,261		4,127
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	634		713
Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	23,051	[4]	23,389	[4]
Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	14,617	[4]	14,805	[4]
Residential Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	683	[4]	753	[4]
Guaranteed Student Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	5,300		5,400
Consumer Other Direct
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,387	[5]	2,396	[5]
Consumer Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	11,009	[5]	10,998	[5]
Consumer Credit Card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	614	[5]	632	[5]
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	58,828		58,476
Accruing 30-89 Days Past Due	101		92
Accruing 90+ Days Past Due	20		26
Nonaccruing	289	[1]	294	[2]
Total	59,238		58,888
Commercial Portfolio Segment [Member] | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	54,026		53,747
Accruing 30-89 Days Past Due	93		81
Accruing 90+ Days Past Due	19		26
Nonaccruing	205	[1]	194	[2]
Total	54,343		54,048
Commercial Portfolio Segment [Member] | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	4,193		4,050
Accruing 30-89 Days Past Due	8		11
Accruing 90+ Days Past Due	1		0
Nonaccruing	59	[1]	66	[2]
Total	4,261		4,127
Commercial Portfolio Segment [Member] | Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	609		679
Accruing 30-89 Days Past Due	0		0
Accruing 90+ Days Past Due	0		0
Nonaccruing	25	[1]	34	[2]
Total	634		713
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	40,088		40,863
Accruing 30-89 Days Past Due	337		395
Accruing 90+ Days Past Due	699		713
Nonaccruing	1,157	[1]	1,228	[2]
Total	42,281		43,199
Residential Portfolio Segment [Member] | Residential Guaranteed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	3,218		3,523
Accruing 30-89 Days Past Due	39		39
Accruing 90+ Days Past Due	673		690
Nonaccruing	0	[1]	0	[2]
Total	3,930		4,252
Residential Portfolio Segment [Member] | Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	22,131	[6]	22,401	[7]
Accruing 30-89 Days Past Due	175	[6]	192	[7]
Accruing 90+ Days Past Due	24	[6]	21	[7]
Nonaccruing	721	[1],[6]	775	[2],[7]
Total	23,051	[6]	23,389	[7]
Residential Portfolio Segment [Member] | Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	14,167		14,314
Accruing 30-89 Days Past Due	116		149
Accruing 90+ Days Past Due	0		1
Nonaccruing	334	[1]	341	[2]
Total	14,617		14,805
Residential Portfolio Segment [Member] | Residential Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	572		625
Accruing 30-89 Days Past Due	7		15
Accruing 90+ Days Past Due	2		1
Nonaccruing	102	[1]	112	[2]
Total	683		753
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	18,657		18,669
Accruing 30-89 Days Past Due	503		646
Accruing 90+ Days Past Due	104		43
Nonaccruing	21	[1]	25	[2]
Total	19,285		19,383
Consumer Portfolio Segment [Member] | Guaranteed Student Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	4,738		4,769
Accruing 30-89 Days Past Due	442		556
Accruing 90+ Days Past Due	95		32
Nonaccruing	0	[1]	0	[2]
Total	5,275		5,357
Consumer Portfolio Segment [Member] | Consumer Other Direct
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	2,366		2,372
Accruing 30-89 Days Past Due	13		15
Accruing 90+ Days Past Due	2		3
Nonaccruing	6	[1]	6	[2]
Total	2,387		2,396
Consumer Portfolio Segment [Member] | Consumer Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	10,951		10,909
Accruing 30-89 Days Past Due	42		68
Accruing 90+ Days Past Due	1		2
Nonaccruing	15	[1]	19	[2]
Total	11,009		10,998
Consumer Portfolio Segment [Member] | Consumer Credit Card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	602		619
Accruing 30-89 Days Past Due	6		7
Accruing 90+ Days Past Due	6		6
Nonaccruing	0	[1]	0	[2]
Total	$ 614		$ 632

[1] 2Nonaccruing loans past due 90 days or more totaled $883 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 loans past due 90 days or more totaled $975 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.

[3] 2 Includes loans of consolidated VIEs355 365

[4] Excludes $3.9 billion and $4.3 billion at March 31, 2013 and December 31, 2012, respectively, of guaranteed residential loans. At March 31, 2013 and December 31, 2012, the majority of these loans had FICO scores of 700 and above.

[5] Excludes $5.3 billion and $5.4 billion at March 31, 2013 and December 31, 2012, respectively, of guaranteed student loans.

[6] 1Includes $360 million of loans carried at fair value, the majority of which were accruing current.

[7] Includes $379 million of loans carried at fair value, the majority of which were accruing current.