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Commitments And Contingencies (Tables) | 9 Months Ended
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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

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