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Segment and Revenue Information (Schedule Of Unallocated Items and Eliminations) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Share-based plans $ (202) $ (202) $ (190)
Deferred compensation (19) (240) (46)
Amortization of previously capitalized interest (81) (110) (170)
Unallocated Items And Eliminations [Member]      
Segment Reporting Information [Line Items]      
Share-based plans (76) (77) (66)
Deferred compensation (19) (240) (46)
Amortization of previously capitalized interest (92) (96) (106)
Eliminations and other unallocated items (1,227) (686) (489)
Operating Loss Excluding Unallocated Pension and Postretirement Adjustments (1,414) (1,099) (707)
FAS/CAS Service Cost Adjustment 1,327 1,438 1,357
Unallocated Items And Eliminations [Member] | Pension [Member]      
Segment Reporting Information [Line Items]      
FAS/CAS Service Cost Adjustment 1,005 1,127 1,029
Unallocated Items And Eliminations [Member] | Postretirement [Member]      
Segment Reporting Information [Line Items]      
FAS/CAS Service Cost Adjustment $ 322 $ 311 $ 328