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Commitments And Contingencies (Tables)
 3 Months Ended
Mar. 31, 2020
Commitments And Contingencies [Abstract]  
Commitments And Contingencies Activity Our personal injury liability activity was as follows:

Millions,

for the Three Months Ended March 31,

2020

2019

Beginning balance

$

265 

$

271 

Current year accruals

18 

18 

Changes in estimates for prior years

2 

(2)

Payments

(15)

(21)

Ending balance at March 31

$

270 

$

266 

Current portion, ending balance at March 31

$

62 

$

67 
Commitments And Contingencies Activity. Our environmental liability activity was as follows:

Millions,

for the Three Months Ended March 31,

2020

2019

Beginning balance

$

227 

$

223 

Accruals

15 

10 

Payments

(16)

(17)

Ending balance at March 31

$

226 

$

216 

Current portion, ending balance at March 31

$

64 

$

63