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Retirement Plans (Details 9) (Pension Plans, Defined Benefit [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Total target asset allocations	100.00%	100.00%
Fair value of plan assets	$ 2,069	$ 2,052	$ 1,989
Equity securities [Member] | U.S. [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Target allocation percentage of assets, equity securities	15.00%	15.00%
Fair value of plan assets	250	331
Equity securities [Member] | Non-U.S. [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Target allocation percentage of assets, equity securities	30.00%	30.00%
Fair value of plan assets	644	704
Fixed Income Funds [Member] | U.S. [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Target allocation percentage of assets, debt securities	30.00%	30.00%
Fair value of plan assets	582	522
Fixed Income Funds [Member] | Non-U.S. [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Target allocation percentage of assets, debt securities	15.00%	15.00%
Fair value of plan assets	406	318
Balanced Funds [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Target allocation percentage of assets, other	5.00%	5.00%
Fair value of plan assets	69	65
Cash and Cash Equivalents [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Target allocation percentage of assets, other	0.00%	0.00%
Fair value of plan assets	12	11
Other Funds [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Target allocation percentage of assets, other	5.00%	5.00%
Fair value of plan assets	106	101
Level 1 [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Fair value of plan assets	906	1,046
Level 1 [Member] | Equity securities [Member] | U.S. [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Fair value of plan assets	250	331
Level 1 [Member] | Equity securities [Member] | Non-U.S. [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Fair value of plan assets	644	704
Level 1 [Member] | Fixed Income Funds [Member] | U.S. [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Fair value of plan assets	0	0
Level 1 [Member] | Fixed Income Funds [Member] | Non-U.S. [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Fair value of plan assets	0	0
Level 1 [Member] | Balanced Funds [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Fair value of plan assets	0	0
Level 1 [Member] | Cash and Cash Equivalents [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Fair value of plan assets	12	11
Level 1 [Member] | Other Funds [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Fair value of plan assets	0	0
Level 2 [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Fair value of plan assets	1,057	905
Level 2 [Member] | Equity securities [Member] | U.S. [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Fair value of plan assets	0	0
Level 2 [Member] | Equity securities [Member] | Non-U.S. [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Fair value of plan assets	0	0
Level 2 [Member] | Fixed Income Funds [Member] | U.S. [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Fair value of plan assets	582	522
Level 2 [Member] | Fixed Income Funds [Member] | Non-U.S. [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Fair value of plan assets	406	318
Level 2 [Member] | Balanced Funds [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Fair value of plan assets	69	65
Level 2 [Member] | Cash and Cash Equivalents [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Fair value of plan assets	0	0
Level 2 [Member] | Other Funds [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Fair value of plan assets	0	0
Level 3 [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Fair value of plan assets	106	101
Level 3 [Member] | Equity securities [Member] | U.S. [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Fair value of plan assets	0	0
Level 3 [Member] | Equity securities [Member] | Non-U.S. [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Fair value of plan assets	0	0
Level 3 [Member] | Fixed Income Funds [Member] | U.S. [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Fair value of plan assets	0	0
Level 3 [Member] | Fixed Income Funds [Member] | Non-U.S. [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Fair value of plan assets	0	0
Level 3 [Member] | Balanced Funds [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Fair value of plan assets	0	0
Level 3 [Member] | Cash and Cash Equivalents [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Fair value of plan assets	0	0
Level 3 [Member] | Other Funds [Member]
Target allocation and categorization of all defined benefit pension plan assets measured at fair value on recurring basis
Fair value of plan assets	$ 106	$ 101	$ 98

X

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Target allocation percentage in equity securities, debt securities, and other 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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- Definition

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 35

-Paragraph 50

-URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930



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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph d(iv)(b)(i)

-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 132R

-Paragraph 5

-Subparagraph 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.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 87

-Paragraph 49

-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 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

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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



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-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

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

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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.

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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.

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