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Commitments And Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2020
Commitments And Contingencies [Abstract] |
Commitments And Contingencies Activity - Personal Injury | Our personal injury liability activity was as follows:
Millions | 2020 | 2019 | 2018
Beginning balance | $ | 265 | $ | 271 | $ | 285
Current year accruals |  | 72 |  | 78 |  | 74
Changes in estimates for prior years |  | (3) |  | (11) |  | (16)
Payments |  | (64) |  | (73) |  | (72)
Ending balance at December 31 | $ | 270 | $ | 265 | $ | 271
Current portion, ending balance at December 31 | $ | 60 | $ | 63 | $ | 72
Commitments And Contingencies Activity - Environmental | Our environmental liability activity was as follows:
Millions | 2020 | 2019 | 2018
Beginning balance | $ | 227 | $ | 223 | $ | 196
Accruals |  | 76 |  | 67 |  | 84
Payments |  | (70) |  | (63) |  | (57)
Ending balance at December 31 | $ | 233 | $ | 227 | $ | 223
Current portion, ending balance at December 31 | $ | 65 | $ | 62 | $ | 59

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