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Schedule Of Unallocated Items and Eliminations (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting Information [Line Items]        
Share-based plans     $ (150) $ (151)
Unallocated items, eliminations and other [Member]        
Segment Reporting Information [Line Items]        
Share-based plans $ (24) $ (21) (60) (67)
Deferred compensation (56) (78) (112) (174)
Amortization of previously capitalized interest (19) (22) (67) (68)
Eliminations and other unallocated items (359) (112) (929) (462)
Unallocated items, eliminations and other (458) (233) (1,168) (771)
FAS/CAS service cost adjustment 337 346 1,019 1,049
Unallocated items, eliminations and other [Member] | Pension Plans, Defined Benefit [Member]        
Segment Reporting Information [Line Items]        
FAS/CAS service cost adjustment 260 271 780  
Net periodic benefit cost included in Earnings from operations       811
Unallocated items, eliminations and other [Member] | Other Postretirement Benefit Plan, Defined Benefit [Member]        
Segment Reporting Information [Line Items]        
FAS/CAS service cost adjustment $ 77 $ 75 $ 239 $ 238