Description Of Business And Basis Of Presentation	3 Months Ended
Mar. 31, 2012
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, (iv) quantitative credit risk measures, credit portfolio management solutions, training and financial credentialing and certification services and (v) outsourced research and analytical services to institutional customers. Moody's has two reportable segments: MIS and MA. MIS, the credit rating agency, 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 ratings in the distribution of their debt issues to investors. The MA segment, which includes all of the Company's non-rating commercial activities, develops a wide range of products and services that support the risk management activities of institutional participants in global financial markets. Within its RD&A business, MA distributes investor-oriented research and data developed by MIS as part of its ratings process, including in-depth research on major debt issuers, industry studies and commentary on topical credit related events. The RD&A business also produces and provides economic research and credit data and analytical tools such as quantitative credit risk scores. Within its ERS business (formerly referred to as RMS), MA provides both economic and regulatory capital risk management software solutions as well as other credit risk management services. Within its professional services business it provides training, financial credentialing and certification services, credit portfolio management solutions, as well as outsourced research and analytical services to institutional investors. 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 2011 annual report on Form 10-K filed with the SEC on February 27, 2012. 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.

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, (iv) quantitative credit risk measures, credit portfolio management solutions, training and financial credentialing and certification services and (v) outsourced research and analytical services to institutional customers. Moody's has two reportable segments: MIS and MA.

MIS, the credit rating agency, 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 ratings in the distribution of their debt issues to investors.

The MA segment, which includes all of the Company's non-rating commercial activities, develops a wide range of products and services that support the risk management activities of institutional participants in global financial markets. Within its RD&A business, MA distributes investor-oriented research and data developed by MIS as part of its ratings process, including in-depth research on major debt issuers, industry studies and commentary on topical credit related events. The RD&A business also produces and provides economic research and credit data and analytical tools such as quantitative credit risk scores. Within its ERS business (formerly referred to as RMS), MA provides both economic and regulatory capital risk management software solutions as well as other credit risk management services. Within its professional services business it provides training, financial credentialing and certification services, credit portfolio management solutions, as well as outsourced research and analytical services to institutional investors.

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 2011 annual report on Form 10-K filed with the SEC on February 27, 2012. 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.