Earnings (Losses) per Share (Details) (USD $) In Millions, except Per Share data	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Reconciliation of basic earnings per share to diluted earnings per share for income from continuing operations
Weighted average basic shares outstanding	190	183	189	182
Basic earnings (loss) per share	$ 0.88	$ (0.03)	$ 1.83	$ 0.57
Effect of dilutive securities:
Employee stock options and restricted stock awards, shares	5		6	7
Earnings (losses) from continuing operations	$ 165	$ (5)	$ 344	$ 104
Weighted average diluted shares outstanding	195	183	195	189
Diluted earnings (losses) per share	$ 0.85	$ (0.03)	$ 1.77	$ 0.55
Earnings (Losses) Per Share (Textual) [Abstract]
Antidilutive securities excluded from computation of earnings per share, amount	3	20	1	5

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

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This element represents the income or loss from continuing operations attributable to the parent which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests, if any.

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The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.

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

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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