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

Millions,

for the Six Months Ended June 30,

2020

2019

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

Millions,

for the Six Months Ended June 30,

2020

2019

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