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Alternative-A mortgage, a type of U.S. mortgage that, for various reasons, is considered riskier than A-paper, or "prime," and less risky than "subprime," the riskiest category. Alt-A interest rates, which are determined by credit risk, therefore tend to be between those of prime and subprime home loans. Typically, Alt-A mortgages are characterized by borrowers with less than full documentation, lower credit scores and higher LTVs.

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Corporation owned common shares available for sale.

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Securities .

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section H

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

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Securities (Details Textuals) (USD $)	3 Months Ended		9 Months Ended			3 Months Ended					3 Months Ended	9 Months Ended
Securities (Details Textuals) (USD $)	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010	Sep. 30, 2011 Agency Securities [Member]	Sep. 30, 2011 Equity Investment In First Data Corporation [Member]	Dec. 31, 2010 Equity Investment In First Data Corporation [Member]	Dec. 31, 2009 Equity Investment In First Data Corporation [Member]	Sep. 30, 2011 Equity Investment in BlackRock [Member]	Sep. 30, 2011 Equity Investment in China Construction Bank [Member]	Sep. 30, 2011 Equity Investment in China Construction Bank [Member]	Sep. 30, 2010 Equity Investment in China Construction Bank [Member]	Dec. 31, 2010 Equity Investment in China Construction Bank [Member]
Schedule of Available-for-sale Securities [Line Items]
Sale of Stock, Number of Shares Issued in Transaction											13,100,000,000
Corporation Owned Common Shares					12,500,000,000						12,500,000,000	12,500,000,000		25,600,000,000
Cost method investment ownership percentage											5.00%	5.00%		10.00%
Available for sale common shares owned by corporation											10,500,000,000	10,500,000,000
Restricted common shares owned by corporation											2,000,000,000	2,000,000,000
Cost of the investment											$ 4,500,000,000	$ 4,500,000,000		$ 9,200,000,000
Carrying value of investments											7,200,000,000	7,200,000,000		19,700,000,000
Fair value of equity investment											7,700,000,000	7,700,000,000		20,800,000,000
Dividend income on CCB investment												836,000,000	535,000,000
Preferred shares owned by corporation										13,600,000
Carrying value of economic ownership interest in BlackRock in percentage	7.00%		7.00%
Fair value of joint venture									4,700,000,000
Carrying value of joint venture							3,400,000,000	4,700,000,000
Securities (Textuals) [Abstract]
Prime bonds	89.00%		89.00%		90.00%
Alt-A bonds	9.00%		9.00%		8.00%
Subprime bonds	2.00%		2.00%		2.00%
Accumulated net unrealized gains on AFS debt included in accumulated OCI	4,300,000,000		4,300,000,000
Income tax expense			2,500,000,000
Nonperforming debt securities	16,000,000		16,000,000		44,000,000
Payments to Acquire Held-to-maturity Securities			26,168,000,000	100,000,000		26,200,000,000
Held-to-maturity debt securities	26,458,000,000		26,458,000,000		427,000,000	26,500,000,000
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value						26,500,000,000
Fair value of HTM debt securities	26,508,000,000		26,508,000,000		427,000,000	11,000,000,000
Held-to-maturity Securities, Unrecognized Holding Loss						38,000,000
Held To Maturity Unrecognized Holding Gain Fair Value						100,000,000
Held To Maturity Debt Securities Unrecognized Holding Gain, Net						100,000,000
Gross gains recorded in OCI on credit impaired AFS debt securities	2,000,000	18,000,000	6,000,000	82,000,000
Weighted-average severity by collateral type for prime bonds	45.00%		45.00%
Weighted-average severity by collateral type for Alt-A bonds	51.00%		51.00%
Weighted-average severity by collateral type for Subprime bonds	56.00%		56.00%
Weighted-average life default rate by collateral type for prime bonds	37.00%		37.00%
Weighted-average life default rate by collateral type for Alt-A bonds	66.00%		66.00%
Weighted-average life default rate by collateral type for Subprime bonds	62.00%		62.00%
Number of available-for-sale securities where amortized cost exceed their fair value	4,500		4,500		8,500
Amortized cost of AFS securities exceeded fair value by	1,600,000,000		1,600,000,000		4,500,000,000
Pre-tax investment gain			377,000,000								3,600,000,000
Impairment write-down on joint venture	$ 630,000,000		$ 1,100,000,000