Payment Status for the LHFI Portfolio (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	$ 117,723		$ 116,015
Accruing 30-89 Days Past Due	1,259		1,549
Accruing 90+ Days Past Due	1,104		2,028
Nonaccruing	1,731	[1]	2,903	[2]
Total	121,817	[3]	122,495	[3]
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	52,407		49,538
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,491		5,094
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	808		1,240
Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	23,925	[4]	23,243	[4]
Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	15,019	[4]	15,765	[4]
Residential Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	805	[4]	980	[4]
Consumer Other Direct
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,341	[5]	2,059	[5]
Consumer Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	10,781	[5]	10,165	[5]
Consumer Credit Card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	594	[5]	540	[5]
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	57,093		54,838
Accruing 30-89 Days Past Due	102		96
Accruing 90+ Days Past Due	29		12
Nonaccruing	482	[1]	926	[2]
Total	57,706		55,872
Commercial Portfolio Segment [Member] | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	52,009		49,098
Accruing 30-89 Days Past Due	82		80
Accruing 90+ Days Past Due	28		12
Nonaccruing	288	[1]	348	[2]
Total	52,407		49,538
Commercial Portfolio Segment [Member] | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	4,351		4,797
Accruing 30-89 Days Past Due	20		9
Accruing 90+ Days Past Due	1		0
Nonaccruing	119	[1]	288	[2]
Total	4,491		5,094
Commercial Portfolio Segment [Member] | Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	733		943
Accruing 30-89 Days Past Due	0		7
Accruing 90+ Days Past Due	0		0
Nonaccruing	75	[1]	290	[2]
Total	808		1,240
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	42,030		42,855
Accruing 30-89 Days Past Due	557		726
Accruing 90+ Days Past Due	760		1,129
Nonaccruing	1,225	[1]	1,950	[2]
Total	44,572		46,660
Residential Portfolio Segment [Member] | Residential Guaranteed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	3,934		5,394
Accruing 30-89 Days Past Due	151		176
Accruing 90+ Days Past Due	738		1,102
Nonaccruing	0	[1]	0	[2]
Total	4,823		6,672
Residential Portfolio Segment [Member] | Residential Nonguaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	22,866	[6]	21,501	[7]
Accruing 30-89 Days Past Due	251	[6]	324	[7]
Accruing 90+ Days Past Due	22	[6]	26	[7]
Nonaccruing	786	[1],[6]	1,392	[2],[7]
Total	23,925	[6]	23,243	[7]
Residential Portfolio Segment [Member] | Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	14,566		15,223
Accruing 30-89 Days Past Due	143		204
Accruing 90+ Days Past Due	0		0
Nonaccruing	310	[1]	338	[2]
Total	15,019		15,765
Residential Portfolio Segment [Member] | Residential Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	664		737
Accruing 30-89 Days Past Due	12		22
Accruing 90+ Days Past Due	0		1
Nonaccruing	129	[1]	220	[2]
Total	805		980
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	18,600		18,322
Accruing 30-89 Days Past Due	600		727
Accruing 90+ Days Past Due	315		887
Nonaccruing	24	[1]	27	[2]
Total	19,539		19,963
Consumer Portfolio Segment [Member] | Guaranteed Student Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	5,001		5,690
Accruing 30-89 Days Past Due	520		640
Accruing 90+ Days Past Due	302		869
Nonaccruing	0	[1]	0	[2]
Total	5,823		7,199
Consumer Portfolio Segment [Member] | Consumer Other Direct
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	2,313		2,032
Accruing 30-89 Days Past Due	17		14
Accruing 90+ Days Past Due	5		6
Nonaccruing	6	[1]	7	[2]
Total	2,341		2,059
Consumer Portfolio Segment [Member] | Consumer Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	10,704		10,074
Accruing 30-89 Days Past Due	57		66
Accruing 90+ Days Past Due	2		5
Nonaccruing	18	[1]	20	[2]
Total	10,781		10,165
Consumer Portfolio Segment [Member] | Consumer Credit Card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing Current	582		526
Accruing 30-89 Days Past Due	6		7
Accruing 90+ Days Past Due	6		7
Nonaccruing	0	[1]	0	[2]
Total	$ 594		$ 540

[1] Total nonaccruing loans past due 90 days or more totaled $1.3 billion. 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 VIEs374 3,322

[4] Excludes $4.8 billion and $6.7 billion at September 30, 2012 and December 31, 2011, respectively, of guaranteed residential loans. At both September 30, 2012 and December 31, 2011, the majority of these loans had FICO scores of 700 and above.

[5] Excludes $5.8 billion and $7.2 billion at September 30, 2012 and December 31, 2011, respectively, of guaranteed student loans.

[6] Includes $390 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.