Schedule Of Unallocated Items and Eliminations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Share-based plans	$ (58)	$ (50)
Earnings from operations	1,528	1,565
Pension Plans, Defined Benefit [Member]
Segment Reporting Information [Line Items]
Pension and Other Postretirement Benefit Expense	(791)	(655)
Other Postretirement Benefit Plans, Defined Benefit [Member]
Segment Reporting Information [Line Items]
Pension and Other Postretirement Benefit Expense	(91)	(149)
Unallocated Items And Eliminations [Member]
Segment Reporting Information [Line Items]
Share-based plans	(31)	(22)
Deferred compensation	(56)	(36)
Capitalized interest	(17)	(21)
Eliminations and other	(66)	75
Operating Income (Loss) Before Pension Adjustments	170	4
Pension and Other Postretirement Benefit Expense	(339)	(208)
Earnings from operations	(509)	(212)
Unallocated Items And Eliminations [Member] \| Pension Plans, Defined Benefit [Member]
Segment Reporting Information [Line Items]
Pension and Other Postretirement Benefit Expense	(358)	(189)
Unallocated Items And Eliminations [Member] \| Other Postretirement Benefit Plans, Defined Benefit [Member]
Segment Reporting Information [Line Items]
Pension and Other Postretirement Benefit Expense	$ 19	$ (19)

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References+ Details

The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph h

-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 Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5, 11

-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 Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.4)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

+ Details