Compensation Related Costs Share Based Payments Disclosure [Line Items]

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- Definition

Employee Service Share Based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized,Vested and Expected to Vest Period for Recognition

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- Definition

The number of shares under stock awards and stock options that were exercised during the reporting period.

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- Definition

The number of shares under stock awards and stock options that were forfeited during the reporting period.

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- Definition

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

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- Definition

Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements.

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- Definition

Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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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.

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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.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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- Definition

The number of shares newly issued during the reporting period under the plan.

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Stock Compensation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011 Month Entity	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Stock options and SARs exercised, number of shares			2.0
Stock options and SARs forfeited, number of shares			0.4
Cash received from the exercise of stock options			$ 11
Cash paid to settle SARs, RSUs and PSUs			4
Stock compensation expense	1	5	9	11
Total unrecognized compensation cost related to the nonvested portions of all stock based awards granted and expected to vest	$ 20		$ 20
Weighted-average period in which the total unrecognized compensation cost is expected to be recognized	23
PSUs
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Shares issued			0.2
RSUs
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Shares issued			0.3
Minimum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Period in which the total unrecognized compensation cost is expected to be recognized	1
Maximum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Period in which the total unrecognized compensation cost is expected to be recognized	35
Options
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Dividend yield			0.00%
SARs
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Dividend yield			0.00%