Description of the designated measurement period for determining level of achievement of performance targets.

No definition available.

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- Definition

Payout on stock-based compensation award presented as a percentage of target award

+ References

No definition available.

+ Details

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- Definition

Reflects the timing, in number of years, as to when the share-based award expires as specified in the award agreement.

+ References

No definition available.

+ Details

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- Definition

The number of outstanding awards of stock option equivalents.

+ References

No definition available.

+ Details

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Namespace Prefix:	cbs_
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Balance Type:	na
Period Type:	instant

- Details

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- Details

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- Details

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph h

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

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- Definition

The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

+ References

+ Details

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- Definition

Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph i

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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-Topic 230

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-Number 95

-Paragraph 18

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-Publisher FASB

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-Paragraph 19

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+ Details

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- Definition

Description of the estimated period of time over which an employee is required to provide service in exchange for the equity-based payment award, which often is the vesting period. This period may be explicit or implicit based on the terms of the award, and may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph a

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-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

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- Definition

The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

+ References

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-Paragraph A240

-Subparagraph c(2)

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Stockholders' Equity (Other Information) (Details) (USD $) Share data in Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock Options And Equivalents [Abstract]
Stock Option Equivalents Outstanding	2
Stock Option Exercises Information [Abstract]
Cash received from stock option exercises	$ 72,000,000	$ 7,000,000	$ 0
Tax benefit of stock option exercises	45,000,000	5,000,000	0
Intrinsic value	117,000,000	13,000,000	0
Employee Stock Option [Member]
Stock-based compensation by award type [Line Items]
Service period over which grants vest	three-to four-year service period
Stock option term until expiration	eight to ten years
Unrecognized Stock Based Compensation [Abstract]
Unrecognized future expense of stock-based compensation awards	68,000,000
Weighted average future expense period of unrecognized stock-based compensation expense (years)	2.5
Restricted Stock Units [Member]
Stock-based compensation by award type [Line Items]
Service period over which grants vest	one-to four-year service period
Unrecognized Stock Based Compensation [Abstract]
Unrecognized future expense of stock-based compensation awards	$ 152,000,000
Weighted average future expense period of unrecognized stock-based compensation expense (years)	2.3
Performance share units [Member]
Stock-based compensation by award type [Line Items]
Service period over which grants vest	three-to four-year service period
Measurement period	3Y
Performance share units [Member] \| Maximum [Member]
Stock-based compensation by award type [Line Items]
Payout on stock-based compensation award (percent)	300.00%
Performance share units [Member] \| Minimum [Member]
Stock-based compensation by award type [Line Items]
Payout on stock-based compensation award (percent)	0.00%