LHFI by Credit Quality Indicator (Detail) (USD $) In Millions	Jun. 30, 2011		Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 114,913	[1]	$ 115,975	[1]
Pass | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	43,551		42,140
Criticized Accruing | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,834		2,029
Criticized Nonaccruing | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	537		584
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	45,922		44,753
Pass | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,941		4,316
Criticized Accruing | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,367		1,509
Criticized Nonaccruing | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	399		342
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	5,707		6,167
Pass | Commercial Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	641		836
Criticized Accruing | Commercial Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	472		771
Criticized Nonaccruing | Commercial Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	627		961
Commercial Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,740		2,568
FICO Score 700 and Above | Residential Nonguaranteed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	15,752	[2]	15,920	[2]
FICO Score Between 620 and 699 | Residential Nonguaranteed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	4,226	[2]	4,457	[2]
FICO Score Below 620 | Residential Nonguaranteed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,246	[2],[3]	3,582	[2],[3]
Residential Nonguaranteed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	23,224	[2]	23,959	[2]
FICO Score 700 and Above | Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	11,471		11,673
FICO Score Between 620 and 699 | Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,862		2,897
FICO Score Below 620 | Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,836	[3]	2,181	[3]
Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	16,169		16,751
FICO Score 700 and Above | Residential Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	752		828
FICO Score Between 620 and 699 | Residential Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	219		258
FICO Score Below 620 | Residential Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	147	[3]	205	[3]
Residential Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,118		1,291
FICO Score 700 and Above | Consumer Other Direct
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,111	[4]	973	[4]
FICO Score Between 620 and 699 | Consumer Other Direct
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	237	[4]	231	[4]
FICO Score Below 620 | Consumer Other Direct
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	90	[3],[4]	105	[3],[4]
Consumer Other Direct
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,438	[4]	1,309	[4]
FICO Score 700 and Above | Consumer Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	7,023		6,780
FICO Score Between 620 and 699 | Consumer Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,822		1,799
FICO Score Below 620 | Consumer Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	785	[3]	920	[3]
Consumer Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	9,630		9,499
FICO Score 700 and Above | Consumer Credit Card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	219		258
FICO Score Between 620 and 699 | Consumer Credit Card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	123		149
FICO Score Below 620 | Consumer Credit Card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	65	[3]	78	[3]
Consumer Credit Card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 407		$ 485

[1] Includes loans of consolidated VIEs 2,896 2,869

[2] Excludes $4.5 billion at both June 30, 2011 and December 31, 2010 of federally guaranteed residential loans. At both June 30, 2011 and December 31, 2010, the vast majority of these loans had FICO scores of 700 and above.

[3] For substantially all loans with refreshed FICO scores below 620, the borrower's FICO score at the time of origination exceeded 620 but has since deteriorated as the loan has seasoned.

[4] Excludes $425 million and $413 million as of June 30, 2011 and December 31, 2010, respectively, of private-label student loans with third party insurance. At both June 30, 2011 and December 31, 2010, the vast majority of these loans had FICO scores of 700 and above.