Commitments And Contingencies (Tables)

12 Months Ended

Dec. 31, 2019

Commitments And Contingencies [Abstract]

Commitments And Contingencies Activity - Personal Injury

Our personal injury liability activity was as follows:

Millions	2019		2018		2017
Beginning balance	$	271	$	285	$	290
Current year accruals		78		74		77
Changes in estimates for prior years		(11)		(16)		(7)
Payments		(73)		(72)		(75)
Ending balance at December 31	$	265	$	271	$	285
Current portion, ending balance at December 31	$	63	$	72	$	66

Commitments And Contingencies Activity - Environmental

Our environmental liability activity was as follows:

Millions	2019		2018		2017
Beginning balance	$	223	$	196	$	212
Accruals		67		84		45
Payments		(63)		(57)		(61)
Ending balance at December 31	$	227	$	223	$	196
Current portion, ending balance at December 31	$	62	$	59	$	57