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Commitments And Contingencies (Tables)
 9 Months Ended
Sep. 30, 2020
Commitments And Contingencies [Abstract]  
Commitments And Contingencies Activity Our personal injury liability activity was as follows:

Millions,

for the Nine Months Ended September 30,

2020 

2019 

Beginning balance

$

265 

$

271 

Current year accruals

52 

59 

Changes in estimates for prior years

(4)

(17)

Payments

(47)

(41)

Ending balance at September 30

$

266 

$

272 

Current portion, ending balance at September 30

$

62 

$

61 
Commitments And Contingencies Activity. Our environmental liability activity was as follows:

Millions,

for the Nine Months Ended September 30,

2020 

2019 

Beginning balance

$

227 

$

223 

Accruals

55 

52 

Payments

(47)

(49)

Ending balance at September 30

$

235 

$

226 

Current portion, ending balance at September 30

$

65 

$

62