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Schedule Of Unallocated Items and Eliminations (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Segment Reporting Information [Line Items]        
Share-based plans     $ (97) $ (94)
Earnings/(loss) from operations $ (419) $ 1,683 1,369 3,702
Pension Plans, Defined Benefit [Member]        
Segment Reporting Information [Line Items]        
Pension and Postretirement Expense (463) (523) (1,092) (1,308)
Other Postretirement Benefit Plan, Defined Benefit [Member]        
Segment Reporting Information [Line Items]        
Pension and Postretirement Expense (62) (69) (150) (161)
Unallocated items, eliminations and other [Member]        
Segment Reporting Information [Line Items]        
Share-based plans (18) (16) (41) (37)
Deferred compensation (21) 10 (5) (48)
Amortization of previously capitalized interest (18) (20) (48) (49)
Total Other and Eliminations (69) (24) (198) (164)
Sub-total (126) (50) (292) (298)
Pension and Postretirement Expense 69 (30) 163 (143)
Earnings/(loss) from operations (57) (80) (129) (441)
Unallocated items, eliminations and other [Member] | Pension Plans, Defined Benefit [Member]        
Segment Reporting Information [Line Items]        
Pension and Postretirement Expense 34 (57) 79 (209)
Unallocated items, eliminations and other [Member] | Other Postretirement Benefit Plan, Defined Benefit [Member]        
Segment Reporting Information [Line Items]        
Pension and Postretirement Expense $ 35 $ 27 $ 84 $ 66