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Commitments And Contingencies (Tables)
 9 Months Ended
Sep. 30, 2021
Commitments And Contingencies [Abstract]  
Commitments And Contingencies Activity Our personal injury liability activity was as follows:

Millions,

for the Nine Months Ended September 30,

2021

2020 

Beginning balance

$

270 

$

265 

Current year accruals

69 

52 

Changes in estimates for prior years

19 

(4)

Payments

(55)

(47)

Ending balance at September 30

$

303 

$

266 

Current portion, ending balance at September 30

$

62 

$

62 
Commitments And Contingencies Activity. Our environmental liability activity was as follows:

Millions,

for the Nine Months Ended September 30,

2021

2020 

Beginning balance

$

233 

$

227 

Accruals

56 

55 

Payments

(41)

(47)

Ending balance at September 30

$

248 

$

235 

Current portion, ending balance at September 30

$

60 

$

65