Note 13 - Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2023

Notes Tables

Schedule of Loss Contingencies by Contingency, Environmental [Table Text Block]

Millions, for the Three Months Ended March 31,	2023			2022
Beginning balance	$	253		$	243
Accruals		44			40
Payments		(26	)		(15	)
Ending balance at March 31,	$	271		$	268
Current portion, ending balance at March 31,	$	74		$	64

Personal Injury [Member]

Notes Tables

Schedule of Loss Contingencies by Contingency [Table Text Block]

Millions, for the Three Months Ended March 31,	2023			2022
Beginning balance	$	361		$	325
Current year accruals		27			23
Changes in estimates for prior years		7			6
Payments		(16	)		(22	)
Ending balance at March 31,	$	379		$	332
Current portion, ending balance at March 31,	$	84		$	67