Note 15 - Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

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

Millions, for the Six Months Ended June 30,	2022			2021
Beginning balance	$	243		$	233
Accruals		52			43
Payments		(29	)		(26	)
Ending balance at June 30,	$	266		$	250
Current portion, ending balance at June 30,	$	64		$	63

Personal Injury [Member]

Notes Tables

Schedule of Loss Contingencies by Contingency [Table Text Block]

Millions, for the Six Months Ended June 30,	2022			2021
Beginning balance	$	325		$	270
Current year accruals		51			45
Changes in estimates for prior years		36			17
Payments		(65	)		(31	)
Ending balance at June 30,	$	347		$	301
Current portion, ending balance at June 30,	$	70		$	62