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

Millions,

for the Six Months Ended June 30,

2021

2020

Beginning balance

$

270 

$

265 

Current year accruals

45 

34 

Changes in estimates for prior years

17 

(4)

Payments

(31)

(36)

Ending balance at June 30

$

301 

$

259 

Current portion, ending balance at June 30

$

62 

$

65 

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

Millions,

for the Six Months Ended June 30,

2021

2020

Beginning balance

$

233 

$

227 

Accruals

43 

28 

Payments

(26)

(27)

Ending balance at June 30

$

250 

$

228 

Current portion, ending balance at June 30

$

63 

$

63