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United Kingdom Energy Crisis and Impairment Charges - Impairment Assumptions (Details) $ in Millions | Sep. 30, 2021 USD ($)
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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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