Shareholders' Equity (Details Textuals) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2011
Shareholders' Equity (Textuals)
Aggregate value of common stock repurchased under accelerated share repurchase agreement			$ 300
Share of Class A common stock received			6
Amount pending for final settlement	41		41
Additional Stock Purchase Weighted Average Price	$ 42.64		$ 42.64
Additional shares repurchased			1
Repurchased shares of our Class A common stock	6	4	10	9
Weighted average price for repurchase of stock	$ 34.98	$ 31.88	$ 36.84	$ 30.65
Percentage increase in cash dividend			12.50%
Dividends per share	$ 0.09	$ 0.08	$ 0.18	$ 0.16	$ 0.36
Dividends paid	$ 48	$ 40	$ 97	$ 80
The maximum number of shares of our Class A common stock that may be repurchased every year			Equal to the total number of shares issued pursuant to our equity awards in the previous year and the current year

Additional shares repurchased.

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- Definition

Additional Stock Purchase Weighted Average Price.

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- Definition

Aggregate Value of common stock repurchased under accelerated share repurchase agreement.

+ Details

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- Definition

Amount Pending For Final Settlement.

+ Details

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- Definition

The maximum number of shares of our Class A common stock that may be repurchased every year.

+ Details

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- Definition

Percentage increase in cash dividend.

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- Definition

Shareholders Equity.

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- Definition

Shares repurchased during period under accelerated share repurchase agreement.

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- Definition

Weighted average price for repurchase of stock.

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- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

+ Details

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- Definition

The cash outflow from the distribution of an entity's earnings in the form of dividends to common shareholders.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 20
-Subparagraph a

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Chapter 1
-Section B
-Paragraph 11A

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