Composition of the Company's Loan Portfolio (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012		Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 122,691	[1]	$ 122,495	[1]
Loans Held for Sale	2,749	[2]	2,353	[2]
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	50,189		49,538
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	4,910		5,094
Commercial Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,086		1,240
Residential Nonguaranteed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	23,653	[3]	23,243	[3]
Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	15,472		15,765
Residential Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	924		980
Consumer Other Direct
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,688	[4]	1,610	[4]
Consumer Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	10,145		10,165
Consumer Credit Card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	527		540
Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	56,185		55,872
Commercial Portfolio Segment | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	50,189		49,538
Commercial Portfolio Segment | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	4,910		5,094
Commercial Portfolio Segment | Commercial Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,086		1,240
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	46,496		46,660
Residential Mortgage Loans | Residential Guaranteed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	6,447		6,672
Residential Mortgage Loans | Residential Nonguaranteed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	23,653	[5]	23,243	[6]
Residential Mortgage Loans | Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	15,472		15,765
Residential Mortgage Loans | Residential Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	924		980
Consumer Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	20,010		19,963
Consumer Portfolio Segment | Guaranteed Student Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	7,186		7,199
Consumer Portfolio Segment | Consumer Other Direct
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,152		2,059
Consumer Portfolio Segment | Consumer Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	10,145		10,165
Consumer Portfolio Segment | Consumer Credit Card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	527		540
Loans Held For Investment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	122,691		122,495
Loans Held For Investment [Member] | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	56,185		55,872
Loans Held For Investment [Member] | Commercial Portfolio Segment | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	50,189		49,538
Loans Held For Investment [Member] | Commercial Portfolio Segment | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	4,910		5,094
Loans Held For Investment [Member] | Commercial Portfolio Segment | Commercial Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,086		1,240
Loans Held For Investment [Member] | Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	46,496		46,660
Loans Held For Investment [Member] | Residential Mortgage Loans | Residential Guaranteed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	6,447		6,672
Loans Held For Investment [Member] | Residential Mortgage Loans | Residential Nonguaranteed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	23,653	[7]	23,243	[7]
Loans Held For Investment [Member] | Residential Mortgage Loans | Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	15,472		15,765
Loans Held For Investment [Member] | Residential Mortgage Loans | Residential Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	924		980
Loans Held For Investment [Member] | Consumer Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	20,010		19,963
Loans Held For Investment [Member] | Consumer Portfolio Segment | Guaranteed Student Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	7,186		7,199
Loans Held For Investment [Member] | Consumer Portfolio Segment | Consumer Other Direct
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,152		2,059
Loans Held For Investment [Member] | Consumer Portfolio Segment | Consumer Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	10,145		10,165
Loans Held For Investment [Member] | Consumer Portfolio Segment | Consumer Credit Card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	527		540
Loans Held-for-Sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Held for Sale	$ 2,749		$ 2,353

[1] Includes loans of consolidated VIEs1,378 3,322

[2] Includes loans held for sale, at fair value, of consolidated VIEs326 315

[3] Excludes $6.4 billion and $6.7 billion at March 31, 2012 and December 31, 2011, respectively, of guaranteed residential loans. At both March 31, 2012 and December 31, 2011, the majority of these loans had FICO scores of 700 and above.

[4] Excludes $464 million and $449 million as of March 31, 2012 and December 31, 2011, respectively, of private-label student loans with third party insurance. At March 31, 2012 and December 31, 2011, the majority of these loans had FICO scores of 700 and above.

[5] Includes $411 million of loans carried at fair value.

[6] Includes $431 million of loans carried at fair value.

[7] Includes $411 million and $431 million of loans carried at fair value at March 31, 2012 and December 31, 2011, respectively.