Stock-Based Compensation (Details) (2004 Long-Term Incentive Compensation Plan [Member], USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2012 Y	Mar. 31, 2011
2004 Long-Term Incentive Compensation Plan [Member]
Stock Based Compensation (Textual) [Abstract]
Stock options granted during the period	371,000
Weighted-average fair value per option for options granted	$ 18.62
Weighted average exercise price per share for options granted	$ 55.06
Restricted stock and units granted during the period	1,345,000
Weighted-average fair value per stock or unit granted, restricted stock	$ 54.98
Compensation expense, net of reimbursements	$ 18	$ 19
Unrecognized compensation cost of nonvested options and restricted stock, net of estimated forfeitures	$ 113
Weighted-average period of unrecognized compensation cost expected to be recognized	1.89

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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

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-Name Accounting Standards Codification

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-Name Staff Accounting Bulletin (SAB)

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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.

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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.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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

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- Definition

Gross number of share options (or share units) granted during the period.

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No definition available.

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The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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