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Schedule Of Unallocated Items and Eliminations (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Segment Reporting Information [Line Items]        
Share-based plans     $ (156) $ (148)
Earnings from operations 1,803 1,559 5,047 4,666
Pension Plans, Defined Benefit [Member]
       
Segment Reporting Information [Line Items]        
Pension and Other Postretirement Benefit Expense (775) (583) (2,319) (1,831)
Other Postretirement Benefit Plans [Member]
       
Segment Reporting Information [Line Items]        
Pension and Other Postretirement Benefit Expense (90) (132) (269) (414)
Unallocated Items And Eliminations [Member]
       
Segment Reporting Information [Line Items]        
Share-based plans (21) (23) (74) (64)
Deferred compensation (63) (15) (165) (49)
Capitalized interest (18) (16) (52) (53)
Eliminations and other (124) (87) (282) (126)
Operating Income (Loss) Before Pension Adjustments (226) (141) (573) (292)
Pension and Other Postretirement Benefit Expense (340) (234) (991) (687)
Earnings from operations (566) (375) (1,564) (979)
Unallocated Items And Eliminations [Member] | Pension Plans, Defined Benefit [Member]
       
Segment Reporting Information [Line Items]        
Pension and Other Postretirement Benefit Expense (356) (204) (1,045) (608)
Unallocated Items And Eliminations [Member] | Other Postretirement Benefit Plans [Member]
       
Segment Reporting Information [Line Items]        
Pension and Other Postretirement Benefit Expense $ 16 $ (30) $ 54 $ (79)