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Postretirement Benefit Plans (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Employee Benefit Plan (Textual) [Abstract]
Remeasurement of projected benefit obligations and plan assets resulted in an improvement to the funded status	$ 41
Defined benefit plan accumulated other comprehensive income unrecognized actuarial loss before tax	9
Net postretirement liability	296
U.S. Pension Plans [Member]
Employee Benefit Plans (Additional Textual) [Abstract]
Contributions made to pension plans	32
Discretionary contribution made to pension plans	$ 15
Mandatory contribution made to pension plans	17

X

- Definition

Defined benefit plan accumulated other comprehensive income unrecognized actuarial loss before tax.

+ References

No definition available.

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X

- Definition

Defined benefit plan discretionary contributions by employer.

+ References

No definition available.

+ Details

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X

- Definition

Defined benefit plan, mandatory contributions by employer.

+ References

No definition available.

+ Details

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X

- Details

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- Details

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X

- Definition

Increase (decrease) in pension plan funding status

+ References

No definition available.

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X

- Definition

The increase in the fair value of plan assets from contributions made by the employer.

+ References

Reference 1: 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)(3)

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

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X

- Definition

This represents the entire liability recognized in the balance sheet that is associated with the defined benefit plans.

+ References

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

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-Name Accounting Standards Codification

-Topic 715

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 6

-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 3

-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

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-Publisher FASB

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-Paragraph 5

-Subparagraph 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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