Retirement, Other Postretirement Benefits, and Defined Contribution Plans (Details 3)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Domestic [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Equity Securities, Target	39.00%
International [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Equity Securities, Target	26.00%
Postretirement Asset Allocation [Member] \| Taxable [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Fixed Income Securities, Target	65.00%
Fixed Income Securities, Range Minimum	60.00%
Fixed Income Securities, Range Maximum	70.00%
Other, Target	0.00%
Other, Range Minimum	0.00%
Other, Range Maximum	5.00%
Fixed Income Securities	64.00%	60.00%
Other	1.00%	1.00%
Postretirement Asset Allocation [Member] \| Taxable [Member] \| Domestic [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Equity Securities, Target	35.00%
Equity Securities, Range Minimum	30.00%
Equity Securities, Range Maximum	40.00%
Equity Securities	35.00%	39.00%
Postretirement Asset Allocation [Member] \| Taxable [Member] \| International [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Equity Securities, Target	0.00%
Equity Securities, Range Minimum	0.00%
Equity Securities, Range Maximum	0.00%
Equity Securities	0.00%	0.00%
Postretirement Asset Allocation [Member] \| Non - Taxable [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Fixed Income Securities, Target	45.00%
Fixed Income Securities, Range Minimum	40.00%
Fixed Income Securities, Range Maximum	50.00%
Other, Target	0.00%
Other, Range Minimum	0.00%
Other, Range Maximum	5.00%
Fixed Income Securities	46.00%	43.00%
Other	0.00%	0.00%
Postretirement Asset Allocation [Member] \| Non - Taxable [Member] \| Domestic [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Equity Securities, Target	38.00%
Equity Securities, Range Minimum	33.00%
Equity Securities, Range Maximum	43.00%
Equity Securities	39.00%	39.00%
Postretirement Asset Allocation [Member] \| Non - Taxable [Member] \| International [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Equity Securities, Target	17.00%
Equity Securities, Range Minimum	12.00%
Equity Securities, Range Maximum	22.00%
Equity Securities	15.00%	18.00%

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

+ References

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

-Paragraph 5

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e2446-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

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- Definition

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

+ References

+ Details

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- Definition

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.

+ References

+ Details

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- Definition

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.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(i)

-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e2446-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(i)

-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

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- Definition

Target allocation maximum 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.

+ References

No definition available.

+ Details

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- Definition

Target allocation minimum 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.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(i)

-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e2446-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(i)

-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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

+ References

No definition available.

+ Details

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- Definition

Target allocation percentage in other than debt securities, equity securities, and real estate to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

+ References

No definition available.

+ Details

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- Definition

Target allocation maximum percentage in other than debt securities, equity securities, and real estate to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

+ References

No definition available.

+ Details

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- Definition

Target allocation minimum percentage in other than debt securities, equity securities, and real estate to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

+ References

No definition available.

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