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Commitments And Contingencies (Commitments And Contingencies Activity) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Liability Activity [Abstract]    
Current portion, ending balance at June 30 $ 182  
Environmental [Abstract]    
Beginning balance. 227 $ 223
Accruals 28 32
Payments (27) (35)
Ending balance at June 30. 228 220
Current portion, ending balance at June 30. 63 63
Personal Injury [Member]    
Liability Activity [Abstract]    
Beginning balance 265 271
Current year accruals 34 36
Changes in estimates for prior years (4) (11)
Payments (36) (31)
Ending balance at June 30 259 265
Current portion, ending balance at June 30 $ 65 $ 63