Casualty, Environmental and Other Reserves - Narrative (Details)		9 Months Ended
	Jun. 01, 2021 USD ($)	Sep. 30, 2023 USD ($) claim site	Dec. 31, 2022 USD ($)
All Contingencies Reserves [Line Items]
Total reserves		$ 435,000,000	$ 436,000,000
Casualty
All Contingencies Reserves [Line Items]
Total reserves		194,000,000	194,000,000
Self-insured retention amount, per occurrence	$ 100,000,000	$ 100,000,000
Number of individual claims expected to exceed self insured retention amount | claim		0
Environmental
All Contingencies Reserves [Line Items]
Total reserves		$ 157,000,000	161,000,000
Environmental impaired sites | site		230
Other
All Contingencies Reserves [Line Items]
Total reserves		$ 84,000,000	$ 81,000,000