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Schedule Of Unallocated Items and Eliminations (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Segment Reporting Information [Line Items]        
Share-based plans     $ (104) $ (98)
Research and Development Expense $ (826) $ (827) (1,692) (1,591)
Asset Impairment Charges     (70) (44)
Unallocated items, eliminations and other [Member]        
Segment Reporting Information [Line Items]        
Share-based plans (22) (18) (36) (36)
Deferred compensation (27) (27) (129) (56)
Amortization of previously capitalized interest (21) (23) (45) (48)
Research and Development Expense (99) (21) (173) (19)
Asset Impairment Charges     (250)  
Litigation Settlement, Expense (109) (148) (109) (148)
Eliminations and other unallocated items (220) (159) (463) (415)
Unallocated items, eliminations and other 498 396 1,205 722
FAS/CAS service cost adjustment 365 317 729 682
Unallocated items, eliminations and other [Member] | Pension Plans, Defined Benefit [Member]        
Segment Reporting Information [Line Items]        
FAS/CAS service cost adjustment 275 237 549 520
Unallocated items, eliminations and other [Member] | Other Postretirement Benefit Plan, Defined Benefit [Member]        
Segment Reporting Information [Line Items]        
FAS/CAS service cost adjustment $ 90 $ 80 $ 180 $ 162