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Schedule Of Unallocated Items and Eliminations (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting Information [Line Items]    
Share-based plans $ (45) $ (50)
Unallocated items, eliminations and other [Member]    
Segment Reporting Information [Line Items]    
Share-based plans (18) (21)
Deferred compensation (29) (50)
Amortization of previously capitalized interest (25) (24)
Eliminations and other unallocated items (239) (126)
Unallocated items, eliminations and other (311) (221)
FAS/CAS Service Cost Adjustment 365 346
Unallocated items, eliminations and other [Member] | Pension Plans, Defined Benefit [Member]    
Segment Reporting Information [Line Items]    
FAS/CAS Service Cost Adjustment 283 262
Unallocated items, eliminations and other [Member] | Other Postretirement Benefit Plan, Defined Benefit [Member]    
Segment Reporting Information [Line Items]    
FAS/CAS Service Cost Adjustment $ (82) $ 84