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Commitments And Contingencies (Tables)

12 Months Ended

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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Tabular disclosure of the evnironmental loss contingencies that were reported in the period or disclosed as of the balance sheet date.

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Tabular disclosure of the loss contingencies that were reported in the period or disclosed as of the balance sheet date.

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