Fair Value Measurement (Details 3) (USD $)	Dec. 31, 2010	Dec. 31, 2009
Financial assets
Accrued interest and accounts receivable (included zero and $5.0 at fair value)	$ 70,147,000,000	$ 67,427,000,000
Federal funds sold and securities purchased under resale agreements (included $20.3 and $20.5 at fair value)	222,554,000,000	195,404,000,000
Securities borrowed (included $14.0 and $7.0 at fair value)	123,587,000,000	119,630,000,000
Trading assets	489,892,000,000	411,128,000,000
Securities (included $316.3 and $360.4 at fair value)	316,336,000,000	360,390,000,000
Loans (included $2.0 and $1.4 at fair value)	660,661,000,000	601,856,000,000
Financial liabilities
Deposits (included $4.4 and $4.5 at fair value)	930,369,000,000	938,367,000,000
Federal funds purchased and securities loaned or sold under repurchase agreements (included $4.1 and $3.4 at fair value)	276,644,000,000	261,413,000,000
Commercial paper	35,363,000,000	41,794,000,000
Other borrowed funds (included $9.9 and $5.6 at fair value)	57,309,000,000	55,740,000,000
Trading liabilities	146,166,000,000	125,071,000,000
Accounts payable and other liabilities (included $0.2 and $0.4 at fair value)	74,971,000,000	69,848,000,000
Beneficial interests issued by consolidated VIEs (included $1.5 and $1.4 at fair value)	77,649,000,000	15,225,000,000
Net (depreciation) appreciation	300,000,000	(7,200,000,000)
The Carrying Value and estimated fair value of the Firm's wholesale lending- related commitments [Abstract]
Fair value of other assets	105,291,000,000	107,091,000,000
Fair value [Member]
Financial assets
Accrued interest and accounts receivable (included zero and $5.0 at fair value)	0	5,012,000,000
Federal funds sold and securities purchased under resale agreements (included $20.3 and $20.5 at fair value)	20,299,000,000	20,536,000,000
Securities borrowed (included $14.0 and $7.0 at fair value)	13,961,000,000	7,032,000,000
Financial liabilities
Deposits (included $4.4 and $4.5 at fair value)	4,369,000,000	4,455,000,000
Federal funds purchased and securities loaned or sold under repurchase agreements (included $4.1 and $3.4 at fair value)	4,060,000,000	3,396,000,000
Other borrowed funds (included $9.9 and $5.6 at fair value)	9,931,000,000	5,637,000,000
Beneficial interests issued by consolidated VIEs (included $1.5 and $1.4 at fair value)	1,495,000,000	1,410,000,000
The Carrying Value and estimated fair value of the Firm's wholesale lending- related commitments [Abstract]
Fair value of other assets	18,201,000,000	19,165,000,000
Contractual principal outstanding [Member]
Financial assets
Assets for which fair value approximates carrying value	49,200,000,000	89,400,000,000
Accrued interest and accounts receivable (included zero and $5.0 at fair value)	70,100,000,000	67,400,000,000
Federal funds sold and securities purchased under resale agreements (included $20.3 and $20.5 at fair value)	222,600,000,000	195,400,000,000
Securities borrowed (included $14.0 and $7.0 at fair value)	123,600,000,000	119,600,000,000
Trading assets	489,900,000,000	411,100,000,000
Securities (included $316.3 and $360.4 at fair value)	316,300,000,000	360,400,000,000
Loans (included $2.0 and $1.4 at fair value)	660,700,000,000	601,900,000,000
Mortgage servicing rights at fair value	13,600,000,000	15,500,000,000
Other (included $18.2 and $19.2 at fair value)	64,900,000,000	73,400,000,000
Total financial assets	2,010,900,000,000	1,934,100,000,000
Financial liabilities
Deposits (included $4.4 and $4.5 at fair value)	930,400,000,000	938,400,000,000
Federal funds purchased and securities loaned or sold under repurchase agreements (included $4.1 and $3.4 at fair value)	276,600,000,000	261,400,000,000
Commercial paper	35,400,000,000	41,800,000,000
Other borrowed funds (included $9.9 and $5.6 at fair value)	57,300,000,000	55,700,000,000
Trading liabilities	146,200,000,000	125,100,000,000
Accounts payable and other liabilities (included $0.2 and $0.4 at fair value)	138,200,000,000	136,800,000,000
Beneficial interests issued by consolidated VIEs (included $1.5 and $1.4 at fair value)	77,600,000,000	15,200,000,000
Long-term debt and junior subordinated deferrable interest debentures (included $38.8 and $49.0 at fair value)	247,700,000,000	266,300,000,000
Total financial liabilities	1,909,400,000,000	1,840,700,000,000
The Carrying Value and estimated fair value of the Firm's wholesale lending- related commitments [Abstract]
Wholesale lending-related commitments	700,000,000	900,000,000
Appreciation/(depreciation) [Member]
Financial assets
Assets for which fair value approximates carrying value	0	0
Accrued interest and accounts receivable (included zero and $5.0 at fair value)	0	0
Federal funds sold and securities purchased under resale agreements (included $20.3 and $20.5 at fair value)	0	0
Securities borrowed (included $14.0 and $7.0 at fair value)	0	0
Trading assets	0	0
Securities (included $316.3 and $360.4 at fair value)	0	0
Loans (included $2.0 and $1.4 at fair value)	2,800,000,000	(3,600,000,000)
Mortgage servicing rights at fair value	0	0
Other (included $18.2 and $19.2 at fair value)	100,000,000	(200,000,000)
Total financial assets	2,900,000,000	(3,800,000,000)
Financial liabilities
Deposits (included $4.4 and $4.5 at fair value)	(1,100,000,000)	(1,100,000,000)
Federal funds purchased and securities loaned or sold under repurchase agreements (included $4.1 and $3.4 at fair value)	0	0
Commercial paper	0	0
Other borrowed funds (included $9.9 and $5.6 at fair value)	100,000,000	(200,000,000)
Trading liabilities	0	0
Accounts payable and other liabilities (included $0.2 and $0.4 at fair value)	0	0
Beneficial interests issued by consolidated VIEs (included $1.5 and $1.4 at fair value)	(300,000,000)	0
Long-term debt and junior subordinated deferrable interest debentures (included $38.8 and $49.0 at fair value)	(1,300,000,000)	(2,100,000,000)
Total financial liabilities	(2,600,000,000)	(3,400,000,000)
Estimate of Fair Value, Fair Value Disclosure [Member]
Financial assets
Assets for which fair value approximates carrying value	49,200,000,000	89,400,000,000
Accrued interest and accounts receivable (included zero and $5.0 at fair value)	70,100,000,000	67,400,000,000
Federal funds sold and securities purchased under resale agreements (included $20.3 and $20.5 at fair value)	222,600,000,000	195,400,000,000
Securities borrowed (included $14.0 and $7.0 at fair value)	123,600,000,000	119,600,000,000
Trading assets	489,900,000,000	411,100,000,000
Securities (included $316.3 and $360.4 at fair value)	316,300,000,000	360,400,000,000
Loans (included $2.0 and $1.4 at fair value)	663,500,000,000	598,300,000,000
Mortgage servicing rights at fair value	13,600,000,000	15,500,000,000
Other (included $18.2 and $19.2 at fair value)	65,000,000,000	73,200,000,000
Total financial assets	2,013,800,000,000	1,930,300,000,000
Financial liabilities
Deposits (included $4.4 and $4.5 at fair value)	931,500,000,000	939,500,000,000
Federal funds purchased and securities loaned or sold under repurchase agreements (included $4.1 and $3.4 at fair value)	276,600,000,000	261,400,000,000
Commercial paper	35,400,000,000	41,800,000,000
Other borrowed funds (included $9.9 and $5.6 at fair value)	57,200,000,000	55,900,000,000
Trading liabilities	146,200,000,000	125,100,000,000
Accounts payable and other liabilities (included $0.2 and $0.4 at fair value)	138,200,000,000	136,800,000,000
Beneficial interests issued by consolidated VIEs (included $1.5 and $1.4 at fair value)	77,900,000,000	15,200,000,000
Long-term debt and junior subordinated deferrable interest debentures (included $38.8 and $49.0 at fair value)	249,000,000,000	268,400,000,000
Total financial liabilities	1,912,000,000,000	1,844,100,000,000
The Carrying Value and estimated fair value of the Firm's wholesale lending- related commitments [Abstract]
Wholesale lending-related commitments	$ 900,000,000	$ 1,300,000,000

Carrying value as of the balance sheet date of obligations incurred and payable. pertaining to goods and services received from vendors; and for costs that are statutory in nature, are incurred in connection with contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered (excluding Brokerage Payables). Examples include taxes, interest, rent, salaries and benefits, and utilities. Also, includes carrying amount as of the balance sheet date of liabilities not otherwise specified in the taxonomy. Also serves as the sum of liabilities not individually reported in the financial statements, or not separately disclosed in notes.

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Accrued interest and accounts receivable comprised of (1) accounts receivable and (2) accrued investment income. (1) Amount due from customers or clients, more than one year from the balance sheet date, for goods or services that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. (2) Interest, dividends, ancillary and other revenues earned but not yet received by the entity on its investments.

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Assets for which fair value approximates carrying value.

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The Carrying Value and estimated fair value of the Firm's wholesale lending- related commitments.

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This element represents the net depreciation/(appreciation) of financial instruments for which it is not practicable to estimate fair value.

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Total federal funds purchased and securities loaned or sold under repurchase agreements classified as (1) Federal funds purchased and securities sold under agreements to repurchase and (2) Securities loaned. (1) The amount shown on the books that a bank with insufficient reserves borrows, at the federal funds rate, from another bank to meet its reserve requirements and the amount of securities that an institution sells and agrees to repurchase at a specified date for a specified price, net of any reductions or offsets. (2) The carrying value as of the balance sheet date of securities loaned to other broker dealers, typically used by such parties to cover short sales, secured by cash or other securities furnished by such parties until the borrowing is closed.

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Total other borrowed funds classified as (1) Other short-term borrowings, short-term and (2) Federal home loan bank, advances. (1) Sum of the carrying amounts at the balance sheet date of short-term borrowings not otherwise specified in the taxonomy having initial terms less than one year or the normal operating cycle, if longer. (2) Federal home loan bank borrowings.

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This item represents the sum as of the balance sheet date of all financial instrument assets that are recognized.

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Financial assets Abstract.

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This item represents the sum as of the balance sheet date of all financial isntrument liabilities that are recognized.

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Financial liabilities Abstract.

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Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, and other types of debt (other than junior subordinated deferrable interest debentures held by trusts that issued guaranteed capital debt securities), which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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Fair value as of the balance sheet date of an asset representing net future revenues from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. The fair value of an asset is the amount at which that asset could be bought or sold (or settled) in a current transaction between willing parties, other than in a forced or liquidation sale. Rights may be obtained via (1) acquisition or assumption of a servicing obligation that does not relate to financial assets of the servicer or its consolidated affiliates; or (2) by originating loans and then (a) transferring the loans to a qualifying special purpose entity in a transaction that meets the necessary transfer and classification requirements, or (b) transferring the loans in a transaction that meets the requirements for sale accounting.

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Other financial assets.

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Total debt and equity financial instruments classified as (1) available-for-sale securities and (2) held-to-maturity securities. (1) For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading. Such securities are reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain or loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis. (2) For an unclassified balance sheet, this item represents investments in debt securities which are categorized as held-to-maturity; such investments are measured at amortized cost (carrying value). The held-to-maturity category is for those securities that the Entity has the positive intent and ability to hold until maturity.

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Total debt and equity financial instruments classified as (1) trading securities and (2) derivative assets. (1) The total of financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for debt and equity securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition; this is the reason why the trading category of investments in debt and equity securities are bought and sold "principally" for sale in the near term. Transfers into and out of the trading category should be rare. Such financial instruments that are held as of the reporting date are measured at fair value with unrealized holding gains and losses (the difference between fair value and the previously reported carrying amount) included in earnings. (2) Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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This item represents wholesale lending related commitments for which it is not practicable to estimate fair value.

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Obligation reflecting another party's right to economic interests in another entity or trust under a contractual right. For example, an investor may purchase a beneficial interest in a securitization transaction.

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Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

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The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

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

-Publisher SEC

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Includes: (1) the amount outstanding of funds lent to other depository institutions, securities brokers, or securities dealers in the form of Federal Funds sold; for example, immediately available funds lent under agreements or contracts that mature in one business day or roll over under a continuing contract, regardless of the nature of the transaction or the collateral involved, excluding overnight lending for commercial and industrial purposes. Also include Federal Funds sold under agreements to resell on a gross basis, excluding (1) sales of term Federal Funds, (2) due bills representing purchases of securities or other assets by the reporting bank that have not yet been delivered and similar instruments, (3) resale agreements that mature in more than one business day involving assets other than securities, and (4) yield maintenance dollar repurchase agreements (Federal Funds Sold) and (2) the dollar amount outstanding of funds lent in the form of security resale agreements regardless of maturity, if the agreement requires the bank to resell the identical security purchased or a security that meets the definition of substantially the same in the case of a dollar roll. Also include purchases of participations in pools of securities, regardless of maturity (Securities Purchased Under Agreements to Re-sell).

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

-Publisher OTS

-Name Federal Regulation (FR)

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-Chapter V

-Section 563c.102

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Regulation S-X (SX)

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Reflects the aggregate carrying amount of all categories of loans and leases held in portfolio, net of unearned income and the allowance for losses on loans and leases.

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

-Publisher AICPA

-Name Statement of Position (SOP)

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Carrying amount as of the balance sheet date of assets not otherwise specified in the taxonomy. Also serves as the sum of assets not individually reported in the financial statements, or not separately disclosed in notes.

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

-Publisher SEC

-Name Regulation S-X (SX)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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The carrying value as of the balance sheet date of securities borrowed from broker-dealers or institutions (a) to deliver them in place of securities not available because of short-sales or late or ineffective deliveries; (b) to lend them in connection with finder or conduit transactions; and (c) to be used for other purposes permitted under federal regulations.

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

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents those liabilities that are incurred for the purpose of generating a profit from short-term fluctuations in price as part of a bank's or company's market-making, hedging and proprietary trading. Examples include short positions in securities, derivatives and commodities.

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