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Summary of Significant Accounting Policies Receivables (Details) $ in Millions | Dec. 31, 2023 USD ($) plant | Dec. 31, 2022 USD ($)
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts Receivable, before Allowance for Credit Loss, Current | $ 104 | $ 106
Income Taxes Receivable, Current | 27 | 4
Other receivables | 26 | 19
Allowance for Doubtful Other Receivables, Current | (2) | (1)
Receivables, net of allowance for doubtful accounts of $2 million at December 31, 2023, and $1 million at December 31, 2022, respectively | $ 155 | $ 127
Number of Plants Operated | plant | 23 |

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