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Segment Information (Schedule Of Unallocated Items and Eliminations) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]                      
Share-based plans                 $ (206) $ (193) $ (186)
Deferred compensation                 (238) (75) (59)
Capitalized interest                 (87) (74) (57)
Total 1,515 1,803 1,716 1,528 1,624 1,559 1,542 1,565 6,562 6,290 5,823
Pension [Member]
                     
Segment Reporting Information [Line Items]                      
Pension and Postretirement                 (3,036) (2,407) (1,648)
Postretirement [Member]
                     
Segment Reporting Information [Line Items]                      
Pension and Postretirement                 (353) (543) (692)
Unallocated Items And Eliminations [Member]
                     
Segment Reporting Information [Line Items]                      
Share-based plans                 (95) (81) (83)
Deferred compensation                 (238) (75) (61)
Capitalized interest                 (69) (70) (51)
Eliminations and other                 703 266 276
Operating Income (Loss) Excluding Unallocated Pension and Postretirement Adjustments                 1,105 492 471
Pension and Postretirement                 (1,314) (899) (517)
Total                 (2,419) (1,391) (988)
Unallocated Items And Eliminations [Member] | Pension [Member]
                     
Segment Reporting Information [Line Items]                      
Pension and Postretirement                 (1,374) (787) (269)
Unallocated Items And Eliminations [Member] | Postretirement [Member]
                     
Segment Reporting Information [Line Items]                      
Pension and Postretirement                 $ 60 $ (112) $ (248)