Employer matching contribution to plan.

No definition available.

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- Definition

Maximum contribution by employer as percentage of participants contribution.

+ References

No definition available.

+ Details

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- Definition

Percentage of employee contribution first threshold of pay.

+ References

No definition available.

+ Details

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- Definition

Percentage of employee contribution second threshold of pay.

+ References

No definition available.

+ Details

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- Definition

Percentage of employer contribution for first threshold of employee contribution.

+ References

No definition available.

+ Details

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- Definition

Percentage of employer contribution for second threshold of employee contribution.

+ References

No definition available.

+ Details

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- Details

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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

-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

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph g

-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 1

-Subparagraph (g)

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

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Retirement Plans (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Retirement Plans (Textual) [Abstract]
Employer matching contribution to plan	A matching contribution of 100% of the first 3% of pay contributed and 50% of the next 2% of pay contributed by employees
Percentage of employer contribution for first threshold of employee contribution	100.00%
Percentage of employee contribution first threshold of pay	3.00%
Percentage of employer contribution for second threshold of employee contribution	50.00%
Percentage of employee contribution second threshold of pay	2.00%
Pension Benefits [Member]
Retirement Plans (Textual) [Abstract]
Expected contributions to plan	$ 31
Contributions to plan	28	19
Other Postretirement Benefits [Member]
Retirement Plans (Textual) [Abstract]
Expected contributions to plan	15
Contributions to plan	16	15
Profit Sharing Plan [Member]
Retirement Plans (Textual) [Abstract]
Maximum Contribution by employer as a percentage of Participants Contribution to Profit Sharing Plan	15.00%
Contributions to plan	11	10	9
Savings Plan [Member]
Retirement Plans (Textual) [Abstract]
Contributions to plan	$ 5	$ 5	$ 4