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Schedule Of Unallocated Items and Eliminations (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Segment Reporting Information [Line Items]        
Share-based plans     $ (101) $ (107)
Earnings from operations 1,787 1,716 3,329 3,244
Pension Plans, Defined Benefit [Member]
       
Segment Reporting Information [Line Items]        
Pension and Postretirement Expense (693) (753) (1,728) (1,544)
Other Postretirement Benefit Plans, Defined Benefit [Member]
       
Segment Reporting Information [Line Items]        
Pension and Postretirement Expense (72) (88) (143) (179)
Unallocated Items And Eliminations [Member]
       
Segment Reporting Information [Line Items]        
Share-based plans (20) (22) (44) (53)
Deferred compensation (26) (46) (19) (102)
Capitalized interest (18) (17) (36) (34)
Eliminations and other (62) (92) (194) (158)
Sub-total (126) (177) (293) (347)
Pension and Postretirement Expense (204) (312) (757) (651)
Earnings from operations (330) (489) (1,050) (998)
Unallocated Items And Eliminations [Member] | Pension Plans, Defined Benefit [Member]
       
Segment Reporting Information [Line Items]        
Pension and Postretirement Expense (228) (331) (804) (689)
Unallocated Items And Eliminations [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
       
Segment Reporting Information [Line Items]        
Pension and Postretirement Expense $ 24 $ 19 $ 47 $ 38