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Schedule Of Unallocated Items and Eliminations (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Share-based plans     $ (493) $ (115)
Research and Development Expense $ (497) $ (625) (996) (1,297)
Corporate Reconciling Items And Eliminations        
Segment Reporting Information [Line Items]        
Share-based plans (14) (25) (142) (43)
Deferred compensation (42) (120) (94) 73
Amortization of previously capitalized interest (22) (27) (44) (50)
Research and Development Expense (43) (62) (85) (116)
Eliminations and other unallocated items (177) (244) (297) (515)
Unallocated items, eliminations and other (298) (478) (662) (651)
FAS/CAS service cost adjustment 268 355 538 702
Corporate Reconciling Items And Eliminations | Pension Plans, Defined Benefit        
Segment Reporting Information [Line Items]        
FAS/CAS service cost adjustment 191 258 384 513
Corporate Reconciling Items And Eliminations | Other Postretirement Benefit Plan, Defined Benefit        
Segment Reporting Information [Line Items]        
FAS/CAS service cost adjustment $ 77 $ 97 $ 154 $ 189