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United Kingdom Energy Crisis and Impairment Charges - Impairment Assumptions (Details) $ in Millions	Sep. 30, 2021 USD ($)
Restructuring and Related Activities [Abstract]
Effect of $5 increase on average selling price per ton	$ (87)
Effect of $5 decrease on average selling price per ton	8
Goodwill Impairment, Effect of $5 increase on average selling price per ton	(20)
Goodwill Impairment, Effect of $5 decrease on average selling price per ton	25
Long-lived asset impairment assumptions, Effect of $.50 increase of natural gas cost per MMbtu	7
Long-lived asset impairment assumptions, Effect of $.50 decrease of natural gas cost per MMbtu	(33)
Goodwill impairment assumptions, Effect of $.50 increase of natural gas cost per MMbtu	20
Goodwill impairment assumptions, Effect of $.50 decrease of natural gas cost per MMbtu	(53)
Long-lived asset impairment assumptions, Effect of 50 basis points increase of discount rate	1
Long-lived asset impairment assumptions, Effect of 50 basis points decrease of discount rate	(1)
Goodwill asset impairment assumptions, Effect of 50 basis points increase of discount rate	14
Goodwill asset impairment assumptions, Effect of 50 basis points decrease of discount rate	$ (22)

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