Postretirement Plans (Schedule Of Estimated Future Benefit Payments) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
2012	$ 2,829
2013	2,979
2014	3,140
2015	3,313
2016	3,448
2017-2021	19,501
Other Postretirement Benefits Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
2012	477
2013	498
2014	522
2015	546
2016	575
2017-2021	3,225
Other Postretirement Benefits Plans [Member] \| Gross Benefits Paid [Member]
Defined Benefit Plan Disclosure [Line Items]
Gross benefits paid, 2012	498
Gross benefits paid, 2013	520
Gross benefits paid, 2014	545
Gross benefits paid, 2015	570
Gross benefits paid, 2016	599
Gross benefits paid, 2017-2021	3,351
Other Postretirement Benefits Plans [Member] \| Medicare Part D Subsidy [Member]
Defined Benefit Plan Disclosure [Line Items]
Medicare Part D subsidy, 2012	(21)
Medicare Part D subsidy, 2013	(22)
Medicare Part D subsidy, 2014	(23)
Medicare Part D subsidy, 2015	(24)
Medicare Part D subsidy, 2016	(24)
Medicare Part D subsidy, 2017-2021	$ (126)

Defined Benefit Plan Expected Future Gross Benefit Payments In Year Five

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Defined Benefit Plan Expected Future Gross Benefit Payments In Year Four

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- Definition

Defined Benefit Plan Expected Future Gross Benefit Payments In Year One

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- Definition

Defined Benefit Plan Expected Future Gross Benefit Payments In Year Thereafter

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No definition available.

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- Definition

Defined Benefit Plan Expected Future Gross Benefit Payments In Year Three

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No definition available.

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- Definition

Defined Benefit Plan Expected Future Gross Benefit Payments In Year Two

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No definition available.

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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)

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

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- Definition

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

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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.

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- Definition

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

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- Definition

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

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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)

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

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- Definition

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

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

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

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

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