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Schedule Of Unallocated Items and Eliminations (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Segment Reporting Information [Line Items]    
Share-based plans $ (52) $ (58)
Earnings from operations 1,542 1,528
Pension Plans, Defined Benefit [Member]
   
Segment Reporting Information [Line Items]    
Pension and Postretirement Expense (1,035) (791)
Other Postretirement Benefit Plans, Defined Benefit [Member]
   
Segment Reporting Information [Line Items]    
Pension and Postretirement Expense (71) (91)
Unallocated Items And Eliminations [Member]
   
Segment Reporting Information [Line Items]    
Share-based plans (24) (31)
Deferred compensation 7 (56)
Capitalized interest (18) (17)
Eliminations and other (132) (66)
Sub-total (167) (170)
Pension and Postretirement Expense (553) (339)
Earnings from operations (720) (509)
Unallocated Items And Eliminations [Member] | Pension Plans, Defined Benefit [Member]
   
Segment Reporting Information [Line Items]    
Pension and Postretirement Expense (576) (358)
Unallocated Items And Eliminations [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
   
Segment Reporting Information [Line Items]    
Pension and Postretirement Expense $ 23 $ 19