Grant of Stock Options, Stock Appreciation Rights (SARs), Restricted Stock Units (RSUs), and Performance Share Units (PSUs) (Detail) (USD $) In Millions, except Per Share data	6 Months Ended
Jun. 30, 2011
Stock options - Granted	0.6
Stock options - Per Share Exercise Price	$ 17.52
Stock options - Weighted-average Grant Date Fair Value	$ 9.82
SARs
Other than options - Granted	0.1
Other than options - Per Share Exercise Price	$ 17.80
Other than options - Weighted-average Grant Date Fair Value	$ 10.00
RSUs
Other than options - Granted	0.9
Other than options - Weighted-average Grant Date Fair Value	$ 17.31
PSUs
Other than options - Granted	0.2
Other than options - Weighted-average Grant Date Fair Value	$ 17.80

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

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- Definition

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

+ Details

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- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(2)(c)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph c(1)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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- Definition

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

+ References

+ Details

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- Definition

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.

+ References

+ Details

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- Definition

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

+ References

+ Details

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