Casualty, Environmental and Other Reserves - Narrative (Details)		6 Months Ended
	Jun. 01, 2021 USD ($)	Jun. 30, 2021 USD ($) site claim	Dec. 31, 2020 USD ($)
All Contingencies Reserves [Line Items]
Total reserves		$ 312,000,000	$ 314,000,000
Casualty
All Contingencies Reserves [Line Items]
Total reserves		191,000,000	196,000,000
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		$ 77,000,000	76,000,000
Environmental impaired sites | site		210
Other
All Contingencies Reserves [Line Items]
Total reserves		$ 44,000,000	$ 42,000,000