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Schedule Of Unallocated Items and Eliminations (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Segment Reporting Information [Line Items]    
Share-based plans $ (203) $ (321)
Research and Development Expense (633) (499)
Corporate Reconciling Items And Eliminations    
Segment Reporting Information [Line Items]    
Share-based plans (83) (128)
Deferred compensation 42 (52)
Amortization of previously capitalized interest (23) (22)
Research and Development Expense (52) (42)
Eliminations and other unallocated items (144) (120)
Unallocated items, eliminations and other (260) (364)
FAS/CAS service cost adjustment 283 270
Corporate Reconciling Items And Eliminations | Pension Plans, Defined Benefit    
Segment Reporting Information [Line Items]    
FAS/CAS service cost adjustment 208 193
Corporate Reconciling Items And Eliminations | Other Postretirement Benefit Plan, Defined Benefit    
Segment Reporting Information [Line Items]    
FAS/CAS service cost adjustment $ 75 $ 77