Note 14 - Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2024

Notes Tables

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

Millions, for the Three Months Ended March 31,	2024			2023
Beginning balance	$	245		$	253
Accruals		28			44
Payments		(19	)		(26	)
Ending balance at March 31,	$	254		$	271
Current portion, ending balance at March 31,	$	92		$	74

Personal Injury [Member]

Notes Tables

Schedule of Loss Contingencies by Contingency [Table Text Block]

Millions, for the Three Months Ended March 31,	2024			2023
Beginning balance	$	383		$	361
Current year accruals		29			27
Changes in estimates for prior years		(4	)		7
Payments		(32	)		(16	)
Ending balance at March 31,	$	376		$	379
Current portion, ending balance at March 31,	$	112		$	84