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Commitments And Contingencies (Tables) | 6 Months Ended
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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

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