Payment Status for the LHFI Portfolio (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	$ 118,008		$ 116,015
Accruing 30-89 Days Past Due	1,133		1,549
Accruing 90+ Days Past Due	782		2,028
Nonaccruing	1,547	[1]	2,903	[2]
Total	121,470	[3]	122,495	[3]
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	54,048		49,538
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,127		5,094
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	713		1,240
Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	23,389	[4]	23,243	[4]
Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	14,805	[4]	15,765	[4]
Residential Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	753	[4]	980	[4]
Guaranteed Student Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	5,400		7,200
Consumer Other Direct
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,396	[5]	2,059	[5]
Consumer Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	10,998	[5]	10,165	[5]
Consumer Credit Card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	632	[5]	540	[5]
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	58,476		54,838
Accruing 30-89 Days Past Due	92		96
Accruing 90+ Days Past Due	26		12
Nonaccruing	294	[1]	926	[2]
Total	58,888		55,872
Commercial Portfolio Segment [Member] | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	53,747		49,098
Accruing 30-89 Days Past Due	81		80
Accruing 90+ Days Past Due	26		12
Nonaccruing	194	[1]	348	[2]
Total	54,048		49,538
Commercial Portfolio Segment [Member] | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	4,050		4,797
Accruing 30-89 Days Past Due	11		9
Accruing 90+ Days Past Due	0		0
Nonaccruing	66	[1]	288	[2]
Total	4,127		5,094
Commercial Portfolio Segment [Member] | Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	679		943
Accruing 30-89 Days Past Due	0		7
Accruing 90+ Days Past Due	0		0
Nonaccruing	34	[1]	290	[2]
Total	713		1,240
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	40,863		42,855
Accruing 30-89 Days Past Due	395		726
Accruing 90+ Days Past Due	713		1,129
Nonaccruing	1,228	[1]	1,950	[2]
Total	43,199		46,660
Residential Portfolio Segment [Member] | Residential Guaranteed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	3,523		5,394
Accruing 30-89 Days Past Due	39		176
Accruing 90+ Days Past Due	690		1,102
Nonaccruing	0	[1]	0	[2]
Total	4,252		6,672
Residential Portfolio Segment [Member] | Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	22,401	[6]	21,501	[7]
Accruing 30-89 Days Past Due	192	[6]	324	[7]
Accruing 90+ Days Past Due	21	[6]	26	[7]
Nonaccruing	775	[1],[6]	1,392	[2],[7]
Total	23,389	[6]	23,243	[7]
Residential Portfolio Segment [Member] | Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	14,314		15,223
Accruing 30-89 Days Past Due	149		204
Accruing 90+ Days Past Due	1		0
Nonaccruing	341	[1]	338	[2]
Total	14,805		15,765
Residential Portfolio Segment [Member] | Residential Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	625		737
Accruing 30-89 Days Past Due	15		22
Accruing 90+ Days Past Due	1		1
Nonaccruing	112	[1]	220	[2]
Total	753		980
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	18,669		18,322
Accruing 30-89 Days Past Due	646		727
Accruing 90+ Days Past Due	43		887
Nonaccruing	25	[1]	27	[2]
Total	19,383		19,963
Consumer Portfolio Segment [Member] | Guaranteed Student Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	4,769		5,690
Accruing 30-89 Days Past Due	556		640
Accruing 90+ Days Past Due	32		869
Nonaccruing	0	[1]	0	[2]
Total	5,357		7,199
Consumer Portfolio Segment [Member] | Consumer Other Direct
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	2,372		2,032
Accruing 30-89 Days Past Due	15		14
Accruing 90+ Days Past Due	3		6
Nonaccruing	6	[1]	7	[2]
Total	2,396		2,059
Consumer Portfolio Segment [Member] | Consumer Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	10,909		10,074
Accruing 30-89 Days Past Due	68		66
Accruing 90+ Days Past Due	2		5
Nonaccruing	19	[1]	20	[2]
Total	10,998		10,165
Consumer Portfolio Segment [Member] | Consumer Credit Card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	619		526
Accruing 30-89 Days Past Due	7		7
Accruing 90+ Days Past Due	6		7
Nonaccruing	0	[1]	0	[2]
Total	$ 632		$ 540

[1] Total 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.

[2] Total nonaccruing loans past due 90 days or more totaled $2.3 billion. Nonaccruing loans past due fewer than 90 days include modified nonaccrual loans reported as TDRs.

[3] 2 Includes loans of consolidated VIEs365 3,322

[4] Excludes $4.3 billion and $6.7 billion at December 31, 2012 and 2011, respectively, of guaranteed residential loans. At both December 31, 2012 and 2011, the majority of these loans had FICO scores of 700 and above.

[5] Excludes $5.4 billion and $7.2 billion at December 31, 2012 and 2011, respectively, of guaranteed student loans.

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

[7] Includes $431 million of loans carried at fair value, the majority of which were accruing current.