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Note 17 - Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

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

Millions		2021				2020				2019
Beginning balance		$	233			$	227			$	223
Accruals			69				76				67
Payments			(59	)			(70	)			(63	)
Ending balance at December 31		$	243			$	233			$	227
Current portion, ending balance at December 31		$	60			$	65			$	62

Personal Injury [Member]

Notes Tables

Schedule of Loss Contingencies by Contingency [Table Text Block]

Millions		2021				2020				2019
Beginning balance		$	270			$	265			$	271
Current year accruals			93				72				78
Changes in estimates for prior years			48				(3	)			(11	)
Payments			(86	)			(64	)			(73	)
Ending balance at December 31		$	325			$	270			$	265
Current portion, ending balance at December 31		$	64			$	60			$	63

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