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Note 17 - Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

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

Millions		2022				2021				2020
Beginning balance		$	243			$	233			$	227
Accruals			84				69				76
Payments			(74	)			(59	)			(70	)
Ending balance at December 31		$	253			$	243			$	233
Current portion, ending balance at December 31		$	67			$	60			$	65

Personal Injury [Member]

Notes Tables

Schedule of Loss Contingencies by Contingency [Table Text Block]

Millions		2022				2021				2020
Beginning balance		$	325			$	270			$	265
Current year accruals			107				93				72
Changes in estimates for prior years			55				48				(3	)
Payments			(126	)			(86	)			(64	)
Ending balance at December 31		$	361			$	325			$	270
Current portion, ending balance at December 31		$	84			$	64			$	60

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