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

+ References

No definition available.

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

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No definition available.

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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

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

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-Subparagraph g(1)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

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

+ References

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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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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.

+ References

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

Number of share instruments newly issued under a share-based compensation plan.

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

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-Name Accounting Standards Codification

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Stock Compensation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 RSUs	Jun. 30, 2012 Omnibus Incentive Plan 2012 Maximum	Mar. 31, 2012 Omnibus Incentive Plan 2008
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Number of shares of common stock that may be issued or delivered						5.0	1.9
Stock options and SARs exercised, number of shares			0.5
Stock options and SARs forfeited, number of shares			0.1
Cash received from exercise of stock option			$ 1
Cash paid to settle SARs and RSUs			1
Shares Issued					0.2
Stock compensation expense	3	5	10	8
Total unrecognized compensation cost related to the nonvested portions of all stock based awards granted and expected to vest	$ 24		$ 24
Weighted-average period in which the total unrecognized compensation cost is expected to be recognized	1 year 10 months 24 days