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Schedule Of Unallocated Items and Eliminations (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting Information [Line Items]        
Share-based plans     $ (160) $ (150)
Research and Development Expense $ (778) $ (826) (2,470) (2,417)
Asset Impairment Charges     (106) (63)
Unallocated items, eliminations and other [Member]        
Segment Reporting Information [Line Items]        
Share-based plans (21) (24) (57) (60)
Deferred compensation (25) (56) (154) (112)
Amortization of previously capitalized interest (23) (19) (68) (67)
Research and Development Expense (97) (50) (270) (69)
Asset Impairment Charges     (250)  
Litigation Settlement, Expense (109) (148)
Eliminations and other unallocated items (356) (322) (819) (737)
Unallocated items, eliminations and other 522 471 1,727 1,193
FAS/CAS service cost adjustment 364 337 1,093 1,019
Unallocated items, eliminations and other [Member] | Pension Plans, Defined Benefit [Member]        
Segment Reporting Information [Line Items]        
FAS/CAS service cost adjustment 274 260 823 780
Unallocated items, eliminations and other [Member] | Other Postretirement Benefit Plan, Defined Benefit [Member]        
Segment Reporting Information [Line Items]        
FAS/CAS service cost adjustment $ 90 $ 77 $ 270 $ 239