Related Parties (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
National Amusements Inc. [Member]
Related Party Transaction [Line Items]
NAI ownership of CBS Corp. Class A Common Stock (percentage)	79.00%
NAI ownership of CBS Corp. Class A and Class B Common Stock on a combined basis (percentage)	6.00%
Viacom Inc. [Member]
Related Party Transaction [Line Items]
Revenues from transactions with related party	$ 255,000,000	$ 262,000,000	$ 243,000,000
Expenses from transactions with related party	23,000,000	27,000,000	23,000,000
Receivables, related parties	102,000,000	104,000,000
Other assets (Receivables, noncurrent)	198,000,000	252,000,000
Total amounts due from related parties	300,000,000	356,000,000
Accounts payable, related parties	3,000,000	5,000,000
Program rights obligations due to related parties	2,000,000	4,000,000
Other liabilities (Program rights, noncurrent)	0	1,000,000
Total amounts due to related parties	5,000,000	10,000,000
Equity Method Investee [Member]
Related Party Transaction [Line Items]
Revenues from transactions with related party	$ 133,000,000	$ 145,000,000	$ 132,000,000