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Schedule Of Unallocated Items and Eliminations (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Segment Reporting Information [Line Items]    
Share-based plans $ (47) $ (45)
Research and Development Expense (866) (764)
Asset Impairment Charges (34) (20)
Unallocated items, eliminations and other [Member]    
Segment Reporting Information [Line Items]    
Share-based plans (14) (18)
Deferred compensation (102) (29)
Amortization of previously capitalized interest (24) (25)
Research and Development Expense (74) 2
Asset Impairment Charges (250)  
Eliminations and other unallocated items (243) (256)
Unallocated items, eliminations and other (707) (326)
FAS/CAS service cost adjustment 364 365
Unallocated items, eliminations and other [Member] | Pension Plans, Defined Benefit [Member]    
Segment Reporting Information [Line Items]    
FAS/CAS service cost adjustment 274 283
Unallocated items, eliminations and other [Member] | Other Postretirement Benefit Plan, Defined Benefit [Member]    
Segment Reporting Information [Line Items]    
FAS/CAS service cost adjustment $ 90 $ 82