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Schedule Of Unallocated Items and Eliminations (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Segment Reporting Information [Line Items]    
Share-based plans $ (55) $ (47)
Research and Development Expense (672) (866)
Asset Impairment Charges (26) (34)
Unallocated items, eliminations and other    
Segment Reporting Information [Line Items]    
Share-based plans (18) (14)
Deferred compensation 193 (102)
Amortization of previously capitalized interest (23) (24)
Research and Development Expense (54) (78)
Asset Impairment Charges   (250)
Eliminations and other unallocated items (271) (244)
Unallocated items, eliminations and other (173) (712)
FAS/CAS service cost adjustment 347 364
Unallocated items, eliminations and other | Pension Plans, Defined Benefit    
Segment Reporting Information [Line Items]    
FAS/CAS service cost adjustment 255 274
Unallocated items, eliminations and other | Other Postretirement Benefit Plan, Defined Benefit    
Segment Reporting Information [Line Items]    
FAS/CAS service cost adjustment $ 92 $ 90