Long-Term Incentive Employee Compensation (Details 2) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011
Share based compensation, summary of stock options
Stock Options Outstanding, Number	8.0
Stock Options Outstanding, Weighted-Average Contractual Remaining Life (In Years)	3.0
Stock Options Outstanding, Weighted-Average Exercise Price	$ 16.70
Stock Options Outstanding, Aggregate Intrinsic Value	$ 25
Stock options exercisable, Number	6.3
Stock Options Exercisable, Weighted-Average Contractual Remaining Life (In Years)	1.6
Stock options exercisable, Weighted Average Exercise Price	$ 16.03
Stock Options Exercisable, Aggregate Intrinsic Value	23
$5 - $10 [Member]
Share based compensation, summary of stock options
Share-based Compensation, Exercise Price Range, Lower Range Limit	$ 5
Share-based Compensation, Exercise Price Range, Upper Range Limit	$ 10
Stock Options Outstanding, Number	0.2
Stock Options Outstanding, Weighted-Average Exercise Price	$ 9.46
Stock Options Outstanding, Aggregate Intrinsic Value	2
Stock options exercisable, Number	0.2
Stock options exercisable, Weighted Average Exercise Price	$ 9.46
Stock Options Exercisable, Aggregate Intrinsic Value	2
$10 - $15 [Member]
Share based compensation, summary of stock options
Share-based Compensation, Exercise Price Range, Lower Range Limit	$ 10
Share-based Compensation, Exercise Price Range, Upper Range Limit	$ 15
Stock Options Outstanding, Number	2.9
Stock Options Outstanding, Weighted-Average Contractual Remaining Life (In Years)	2.2
Stock Options Outstanding, Weighted-Average Exercise Price	$ 12.98
Stock Options Outstanding, Aggregate Intrinsic Value	18
Stock options exercisable, Number	2.6
Stock Options Exercisable, Weighted-Average Contractual Remaining Life (In Years)	1.9
Stock options exercisable, Weighted Average Exercise Price	$ 13.04
Stock Options Exercisable, Aggregate Intrinsic Value	16
$15 - $20 [Member]
Share based compensation, summary of stock options
Share-based Compensation, Exercise Price Range, Lower Range Limit	$ 15
Share-based Compensation, Exercise Price Range, Upper Range Limit	$ 20
Stock Options Outstanding, Number	3.3
Stock Options Outstanding, Weighted-Average Contractual Remaining Life (In Years)	1.9
Stock Options Outstanding, Weighted-Average Exercise Price	$ 18.21
Stock Options Outstanding, Aggregate Intrinsic Value	5
Stock options exercisable, Number	3.0
Stock Options Exercisable, Weighted-Average Contractual Remaining Life (In Years)	1.2
Stock options exercisable, Weighted Average Exercise Price	$ 18.02
Stock Options Exercisable, Aggregate Intrinsic Value	5
$20 - $26 [Member]
Share based compensation, summary of stock options
Share-based Compensation, Exercise Price Range, Lower Range Limit	$ 20
Share-based Compensation, Exercise Price Range, Upper Range Limit	$ 26
Stock Options Outstanding, Number	1.6
Stock Options Outstanding, Weighted-Average Contractual Remaining Life (In Years)	7.2
Stock Options Outstanding, Weighted-Average Exercise Price	$ 21.19
Stock Options Outstanding, Aggregate Intrinsic Value	0
Stock options exercisable, Number	0.5
Stock Options Exercisable, Weighted-Average Contractual Remaining Life (In Years)	2.2
Stock options exercisable, Weighted Average Exercise Price	$ 22.04
Stock Options Exercisable, Aggregate Intrinsic Value	$ 0

Share based compensation arrangements by share based payment award options exercisable intrinsic value.

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- Definition

Share based compensation arrangements by share based payment award options exercisable weighted average remaining contractual term.

+ References

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Share based compensation arrangements by share based payment award options outstanding weighted average remaining contractual term.

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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(1)(c), d(2)

-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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-Name Accounting Standards Codification

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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 vested portions of options outstanding and currently exercisable under the stock option 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(1)(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.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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- Definition

The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph d(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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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-Paragraph 2

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- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(a)

-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 Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(b)

-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

The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option 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(1)(a)

-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 Accounting Standards Codification

-Topic 718

-SubTopic 10

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-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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-Publisher FASB

-Name Accounting Standards Codification

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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