Retirement, Other Postretirement Benefits, and Defined Contribution Plans (Details 2)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Domestic [Member]
Actual Asset Allocation
Equity Securities, Target	39.00%
International [Member]
Actual Asset Allocation
Equity Securities, Target	26.00%
Pension Asset Allocation [Member]
Actual Asset Allocation
Fixed Income Securities, Target	35.00%
Other, Target	0.00%
Fixed Income Securities, Range Minimum	31.00%
Fixed Income Securities, Range Maximum	41.00%
Other, Range Minimum	0.00%
Other, Range Maximum	10.00%
Fixed Income Securities	37.00%	35.00%
Other	1.00%	1.00%
Pension Asset Allocation [Member] \| Domestic [Member]
Actual Asset Allocation
Equity Securities, Target	45.00%
Equity Securities, Range Minimum	34.00%
Equity Securities, Range Maximum	53.00%
Equity Securities	44.00%	44.00%
Pension Asset Allocation [Member] \| International [Member]
Actual Asset Allocation
Equity Securities, Target	20.00%
Equity Securities, Range Minimum	16.00%
Equity Securities, Range Maximum	24.00%
Equity Securities	18.00%	20.00%

The percentage of the fair value of debt securities to the fair value of total plan assets held as of the measurement date.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 715

-SubTopic 20

-Section 50

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-Publisher FASB

-Name Accounting Standards Codification

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The percentage of the fair value of investments other than debt securities, equity securities, and real estate to the fair value of total plan assets held as of the measurement date.

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Target allocation percentage of investments in debt securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 5

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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.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Section 50

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-Paragraph 5

-Subparagraph 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.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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