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Summary of Significant Accounting Policies Receivables (Details) $ in Millions | Dec. 31, 2024 USD ($) plant | Dec. 31, 2023 USD ($)
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts Receivable, before Allowance for Credit Loss, Current | $ 100 | $ 104
Income Taxes Receivable, Current | 12 | 27
Other receivables | 21 | 26
Allowance for Doubtful Other Receivables, Current | (1) | (2)
Receivables, net of allowance for doubtful accounts of $1 at December 31, 2024, and $2 at December 31, 2023, respectively | $ 131 | $ 155
Number of Plants Operated | plant | 22 |

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