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Note 17 - Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

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

Millions		2023				2022				2021
Beginning balance		$	253			$	243			$	233
Accruals			99				84				69
Payments			(107	)			(74	)			(59	)
Ending balance at December 31		$	245			$	253			$	243
Current portion, ending balance at December 31		$	91			$	67			$	60

Personal Injury [Member]

Notes Tables

Schedule of Loss Contingencies by Contingency [Table Text Block]

Millions		2023				2022				2021
Beginning balance		$	361			$	325			$	270
Current year accruals			112				107				93
Changes in estimates for prior years			89				55				48
Payments			(179	)			(126	)			(86	)
Ending balance at December 31		$	383			$	361			$	325
Current portion, ending balance at December 31		$	113			$	84			$	64

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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