Casualty, Environmental and Other Reserves - Narrative (Details)			3 Months Ended
	Jun. 01, 2021 USD ($)	May 31, 2021 USD ($)	Mar. 31, 2022 USD ($) claim site	Dec. 31, 2021 USD ($)
All Contingencies Reserves [Line Items]
Total reserves			$ 385,000,000	$ 368,000,000
Casualty
All Contingencies Reserves [Line Items]
Total reserves			181,000,000	180,000,000
Self-insured retention amount, per occurrence	$ 100,000,000	$ 75,000,000	$ 100,000,000
Number of individual claims expected to exceed self insured retention amount | claim			0
Environmental
All Contingencies Reserves [Line Items]
Total reserves			$ 128,000,000	108,000,000
Environmental impaired sites | site			220
Other
All Contingencies Reserves [Line Items]
Total reserves			$ 76,000,000	$ 80,000,000