Retirement Plans (Details 8) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Expected future minimum benefit payments
2012	$ 1
2013	1
2014	1
2015	1
2016	1
2017 - 2021	4
Expected future benefit payments, Total	9
Pension Benefits [Member]
Expected future minimum benefit payments
2012	68
2013	70
2014	72
2015	73
2016	75
2017 - 2021	399
Expected future benefit payments, Total	757
Other Retirement Benefit Payments, Gross [Member]
Expected future minimum benefit payments
2012	15
2013	16
2014	16
2015	17
2016	17
2017 - 2021	86
Expected future benefit payments, Total	167
Other Postretirement Benefits [Member]
Expected future minimum benefit payments
2012	14
2013	15
2014	15
2015	16
2016	16
2017 - 2021	82
Expected future benefit payments, Total	$ 158

Defined benefit plan expected future benefit payments.

No definition available.

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- Definition

Prescription drug subsidy receipts.

+ References

No definition available.

+ Details

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- Definition

The amount of the aggregate benefits expected to be paid in the five fiscal years thereafter (the aggregate amount of benefits expected to be paid in years 6 through 10 after the 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 f

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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- Definition

The amount of the benefits expected to be paid in Year 5.

+ References

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- Definition

The amount of the benefits expected to be paid in Year 4.

+ References

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- Definition

The amount of the benefits expected to be paid in Year 1.

+ References

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- Definition

The amount of the benefits expected to be paid in Year 3.

+ References

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- Definition

The amount of the benefits expected to be paid in Year 2.

+ References

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- Definition

Aggregate amount for the next five fiscal years following the first five fiscal years (that is the aggregate of fiscal years six through ten) following the balance sheet date of the prescription drug subsidy receipts expected to be received.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 60

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph f

-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 FASB Staff Position (FSP)

-Number FAS106-2

-Paragraph 22

-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 Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (f)

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- Definition

Amount of the prescription drug subsidy receipts expected to be received in Year 5 after the balance sheet date.

+ References

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- Definition

Amount of the prescription drug subsidy receipts expected to be received in Year 4 after the balance sheet date.

+ References

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- Definition

Amount of the prescription drug subsidy receipts expected to be received in Year 1 after the balance sheet date.

+ References

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- Definition

Amount of the prescription drug subsidy receipts expected to be received in Year 3 after the balance sheet date.

+ References

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- Definition

Amount of the prescription drug subsidy receipts expected to be received in Year 2 after the balance sheet date.

+ References

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