Related Parties (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
National Amusements Inc. [Member]
Related Party Transaction [Line Items]
NAI ownership of CBS Corp. Class A Common Stock (percentage)	79.70%
NAI ownership of CBS Corp. Class A and Class B Common Stock on a combined basis (percentage)	6.90%
Viacom Inc. [Member]
Related Party Transaction [Line Items]
Revenues from transactions with related party	$ 37	$ 56
Expenses from transactions with related party	5	7
Receivables from Viacom Inc., current	73		84
Other assets (Receivables, noncurrent) from Viacom Inc.	102		115
Total amounts due from Viacom Inc.	175		199
Domestic and International Television Joint Ventures [Member]
Related Party Transaction [Line Items]
Revenues from transactions with related party	$ 37	$ 32

For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle).

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- Definition

Aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due after one year (or one business cycle).

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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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