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Schedule Of Unallocated Items and Eliminations (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Information [Line Items]        
Share-based plans     $ (98) $ (97)
Earnings/(loss) from operations $ 2,535 $ (419) 4,559 1,369
Pension Plans, Defined Benefit [Member]        
Segment Reporting Information [Line Items]        
Pension and Postretirement Expense (100) (463) (434) (1,092)
Other Postretirement Benefit Plan, Defined Benefit [Member]        
Segment Reporting Information [Line Items]        
Pension and Postretirement Expense (58) (62) (143) (150)
Unallocated items, eliminations and other [Member]        
Segment Reporting Information [Line Items]        
Share-based plans (25) (18) (46) (41)
Deferred compensation (46) (21) (96) (5)
Amortization of previously capitalized interest (20) (18) (51) (48)
Eliminations and other unallocated items (179) (69) (359) (198)
Sub-total (270) (126) (552) (292)
Pension and Postretirement Expense 323 69 638 163
Earnings/(loss) from operations 53 (57) 86 (129)
Unallocated items, eliminations and other [Member] | Pension Plans, Defined Benefit [Member]        
Segment Reporting Information [Line Items]        
Pension and Postretirement Expense 278 34 533 79
Unallocated items, eliminations and other [Member] | Other Postretirement Benefit Plan, Defined Benefit [Member]        
Segment Reporting Information [Line Items]        
Pension and Postretirement Expense $ 45 $ 35 $ 105 $ 84