Earnings per Share (Details) (USD $) In Millions, except Share data	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Reconciliation of basic earnings per share to diluted earnings per share for income from continuing operations
Basic earnings from continuing operations	$ 150	$ 79	$ 179	$ 109
Basic earnings from continuing operations, shares	189,000,000	182,000,000	188,000,000	182,000,000
Income from continuing operations	$ 0.79	$ 0.44	$ 0.95	$ 0.60
Effect of dilutive securities:
Employee stock options and restricted stock awards, shares	6,000,000	7,000,000	7,000,000	6,000,000
Employee options and restricted stock awards, per share	$ (0.02)	$ (0.02)	$ (0.03)	$ (0.02)
Diluted earnings from continuing operations	$ 150	$ 79	$ 179	$ 109
Diluted earnings from continuing operations, shares	195,000,000	189,000,000	195,000,000	188,000,000
Diluted earnings from continuing operations, per share	$ 0.77	$ 0.42	$ 0.92	$ 0.58
Earnings per Share (Textuals) (Abstract)
Antidilutive securities excluded from computation of earnings per share, amount	1,103,000	5,111,000	875,000	5,185,000

Earnings Losses per Share Textuals Abstract.

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Employee options and restricted stock awards per share.

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Net Income (Loss) From Continuing Operations Available To Common Shareholders, Diluted.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 13, 14

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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This element represents the income or loss from continuing operations attributable to the reporting entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items and cumulative effects of changes in accounting principles, but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 29

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-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
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-Name Accounting Research Bulletin (ARB)
-Number 51
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The amount of income (loss) from continuing operations per each share of common stock outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 21
-Article 9

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-Name Statement of Financial Accounting Standard (FAS)
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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-Paragraph 20
-Article 5

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-Name Regulation S-X (SX)
-Number 210
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-Paragraph 18
-Article 7

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The amount of income (loss) from continuing operations available to each share of common stock outstanding during the reporting period and each share that would have been outstanding assuming the issuance of common shares for all dilutive potential common shares outstanding during the reporting period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 21
-Article 9

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
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-Publisher FASB
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-Number 210
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-Paragraph 20
-Article 5

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 18
-Article 7

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Aggregate awards of share options and nonvested shares to be issued to an employee under a share-based compensation arrangement are considered options for purposes of computing diluted earnings per share. Such share-based awards shall be considered to be outstanding as of the grant date for purposes of computing diluted earnings per share even though their exercise may be contingent upon vesting. Those share-based awards are included in the diluted Earnings Per Share (EPS) computation even if the employee may not receive (or be able to sell) the stock until some future date. Accordingly, all shares to be issued shall be included in computing diluted EPS if the effect is dilutive. The dilutive effect of share-based compensation arrangements shall be computed using the treasury stock method. If the equity share options or other equity instruments are outstanding for only part of a period, the shares issuable shall be weighted to reflect the portion of the period during which the equity instruments were outstanding.

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
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The average number of shares issued and outstanding that are used in calculating diluted EPS, determined based on the timing of issuance of shares in the period.

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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Number of [basic] shares, after adjustment for contingently issuable shares and other shares not deemed outstanding, determined by relating the portion of time within a reporting period that common shares have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171

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