Description Of Business And Basis Of Presentation	9 Months Ended
Sep. 30, 2011
Description Of Business And Basis Of Presentation [Abstract]
Description Of Business And Basis Of Presentation	NOTE 1. DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION Moody's is a provider of (i) credit ratings, (ii) credit and economic related research, data and analytical tools, (iii) risk management software and (iv) quantitative credit risk measures, credit portfolio management solutions, training, and financial credentialing and certification services. The Company has two reportable segments: MIS and MA. The MIS segment publishes credit ratings on a wide range of debt obligations and the entities that issue such obligations in markets worldwide. Revenue is derived from the originators and issuers of such transactions who use MIS's ratings to support the distribution of their debt issues to investors. The MA segment, which contains all non-rating commercial activities of the Company, develops a wide range of products and services that support the credit risk management activities of institutional participants in global financial markets. These offerings include quantitative credit risk scores, credit processing software, economic research, analytical models, financial data, specialized advisory and training services and financial credentialing and certification services. MA also distributes investor-oriented research and data developed by MIS as part of its rating process, including in-depth research on major debt issuers, industry studies and commentary on topical events. The Company operated as part of Old D&B until September 30, 2000, when Old D&B separated into two publicly traded companies – Moody's Corporation and New D&B. At that time, Old D&B distributed to its shareholders shares of New D&B stock. New D&B comprised the business of Old D&B's Dun & Bradstreet operating company. The remaining business of Old D&B consisted solely of the business of providing ratings and related research and credit risk management services and was renamed Moody's Corporation. For purposes of governing certain ongoing relationships between the Company and New D&B after the 2000 Distribution and to provide for an orderly transition, the Company and New D&B entered into various agreements including a distribution agreement, tax allocation agreement and employee benefits agreement. These interim financial statements have been prepared in accordance with the instructions to Form 10-Q and should be read in conjunction with the Company's consolidated financial statements and related notes in the Company's 2010 annual report on Form 10-K filed with the SEC on February 28, 2011. The results of interim periods are not necessarily indicative of results for the full year or any subsequent period. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation of financial position, results of operations and cash flows at the dates and for the periods presented have been included. The year-end consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America. Certain prior year amounts have been reclassified to conform to the current year presentation.

Description Of Business And Basis Of Presentation

9 Months Ended

Sep. 30, 2011

Description Of Business And Basis Of Presentation [Abstract]

Description Of Business And Basis Of Presentation

NOTE 1. DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION

Moody's is a provider of (i) credit ratings, (ii) credit and economic related research, data and analytical tools, (iii) risk management software and (iv) quantitative credit risk measures, credit portfolio management solutions, training, and financial credentialing and certification services. The Company has two reportable segments: MIS and MA. The MIS segment publishes credit ratings on a wide range of debt obligations and the entities that issue such obligations in markets worldwide. Revenue is derived from the originators and issuers of such transactions who use MIS's ratings to support the distribution of their debt issues to investors. The MA segment, which contains all non-rating commercial activities of the Company, develops a wide range of products and services that support the credit risk management activities of institutional participants in global financial markets. These offerings include quantitative credit risk scores, credit processing software, economic research, analytical models, financial data, specialized advisory and training services and financial credentialing and certification services. MA also distributes investor-oriented research and data developed by MIS as part of its rating process, including in-depth research on major debt issuers, industry studies and commentary on topical events.

The Company operated as part of Old D&B until September 30, 2000, when Old D&B separated into two publicly traded companies – Moody's Corporation and New D&B. At that time, Old D&B distributed to its shareholders shares of New D&B stock. New D&B comprised the business of Old D&B's Dun & Bradstreet operating company. The remaining business of Old D&B consisted solely of the business of providing ratings and related research and credit risk management services and was renamed Moody's Corporation. For purposes of governing certain ongoing relationships between the Company and New D&B after the 2000 Distribution and to provide for an orderly transition, the Company and New D&B entered into various agreements including a distribution agreement, tax allocation agreement and employee benefits agreement.

These interim financial statements have been prepared in accordance with the instructions to Form 10-Q and should be read in conjunction with the Company's consolidated financial statements and related notes in the Company's 2010 annual report on Form 10-K filed with the SEC on February 28, 2011. The results of interim periods are not necessarily indicative of results for the full year or any subsequent period. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation of financial position, results of operations and cash flows at the dates and for the periods presented have been included. The year-end consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America. Certain prior year amounts have been reclassified to conform to the current year presentation.