Description of Business and Basis of Presentation	9 Months Ended
Jun. 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 Description of Business Viacom Inc. including its consolidated subsidiaries (“Viacom” or the “Company”) is a leading global entertainment content company, engaging audiences on television, motion picture, Internet and mobile platforms through many of the world's best known entertainment brands. Viacom operates through two reporting segments: Media Networks, which includes MTV Networks (“MTVN”) and BET Networks (“BETN”); and Filmed Entertainment. The Media Networks segment provides entertainment content for consumers in key demographics attractive to advertisers, content distributors and retailers. The Filmed Entertainment segment produces, finances and distributes motion pictures and other entertainment content under the Paramount Pictures, Paramount Vantage, MTV Films and Nickelodeon Movies brands. It also acquires films for distribution and has distribution relationships with third parties. Basis of Presentation Unaudited Interim Financial Statements The accompanying unaudited consolidated quarterly financial statements have been prepared on a basis consistent with generally accepted accounting principles in the United States (“GAAP”) for interim financial information and pursuant to the rules of the Securities and Exchange Commission (“SEC”). In the opinion of management, the accompanying unaudited financial statements reflect all adjustments, consisting of only normal and recurring adjustments, necessary for a fair presentation of the results of operations, financial position and cash flows for the periods presented. The results of operations for the periods presented are not necessarily indicative of the results expected for the fiscal year ending September 30, 2011 (“fiscal year 2011”) or any future period. These statements should be read in conjunction with the Company's Form 10-K for the nine month transition period ended September 30, 2010, as filed with the SEC on November 12, 2010 (the “2010 Form 10-K”). Use of Estimates Preparing financial statements in conformity with GAAP requires management to make estimates, judgments and assumptions that affect the reported amounts of assets and liabilities as of the dates presented and the reported amounts of revenues and expenses during the reporting periods presented. Significant estimates inherent in the preparation of the accompanying Consolidated Financial Statements include estimates of film ultimate revenues, product returns, allowances for doubtful accounts, potential outcome of uncertain tax positions, fair value of acquired assets and liabilities, fair value of equity-based compensation and pension benefit assumptions. Estimates are based on past experience and other considerations reasonable under the circumstances. Actual results may differ from these estimates. Reclassification Certain amounts have been reclassified to conform to the fiscal year 2011 presentation.

Description of Business and Basis of Presentation

9 Months Ended

Jun. 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

Description of Business

Viacom Inc. including its consolidated subsidiaries (“Viacom” or the “Company”) is a leading global entertainment content company, engaging audiences on television, motion picture, Internet and mobile platforms through many of the world's best known entertainment brands. Viacom operates through two reporting segments: Media Networks, which includes MTV Networks (“MTVN”) and BET Networks (“BETN”); and Filmed Entertainment. The Media Networks segment provides entertainment content for consumers in key demographics attractive to advertisers, content distributors and retailers. The Filmed Entertainment segment produces, finances and distributes motion pictures and other entertainment content under the Paramount Pictures, Paramount Vantage, MTV Films and Nickelodeon Movies brands. It also acquires films for distribution and has distribution relationships with third parties.

Basis of Presentation

Unaudited Interim Financial Statements

The accompanying unaudited consolidated quarterly financial statements have been prepared on a basis consistent with generally accepted accounting principles in the United States (“GAAP”) for interim financial information and pursuant to the rules of the Securities and Exchange Commission (“SEC”). In the opinion of management, the accompanying unaudited financial statements reflect all adjustments, consisting of only normal and recurring adjustments, necessary for a fair presentation of the results of operations, financial position and cash flows for the periods presented. The results of operations for the periods presented are not necessarily indicative of the results expected for the fiscal year ending September 30, 2011 (“fiscal year 2011”) or any future period. These statements should be read in conjunction with the Company's Form 10-K for the nine month transition period ended September 30, 2010, as filed with the SEC on November 12, 2010 (the “2010 Form 10-K”).

Use of Estimates

Preparing financial statements in conformity with GAAP requires management to make estimates, judgments and assumptions that affect the reported amounts of assets and liabilities as of the dates presented and the reported amounts of revenues and expenses during the reporting periods presented. Significant estimates inherent in the preparation of the accompanying Consolidated Financial Statements include estimates of film ultimate revenues, product returns, allowances for doubtful accounts, potential outcome of uncertain tax positions, fair value of acquired assets and liabilities, fair value of equity-based compensation and pension benefit assumptions. Estimates are based on past experience and other considerations reasonable under the circumstances. Actual results may differ from these estimates.

Reclassification

Certain amounts have been reclassified to conform to the fiscal year 2011 presentation.

- Definition

Description containing the entire organization, consolidation and basis of presentation of financial statements disclosure. May be provided in more than one note to the financial statements, as long as users are provided with an understanding of (1) the significant judgments and assumptions made by an enterprise in determining whether it must consolidate a VIE and/or disclose information about its involvement with a VIE, (2) the nature of restrictions on a consolidated VIE's assets reported by an enterprise in its statement of financial position, including the carrying amounts of such assets, (3) the nature of, and changes in, the risks associated with an enterprise's involvement with the VIE, and (4) how an enterprise's involvement with the VIE affects the enterprise's financial position, financial performance, and cash flows. Describes procedure if disclosures are provided in more than one note to the financial statements.

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