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Summary of Significant Accounting Policies Receivables (Details) $ in Millions | Dec. 31, 2021 USD ($) plant | Dec. 31, 2020 USD ($)
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts Receivable, before Allowance for Credit Loss, Current | $ 172 | $ 161
Income Taxes Receivable, Current | 1 | 2
Other Receivables, Gross, Current | 20 | 23
Allowance for Doubtful Other Receivables, Current | (2) | (2)
Receivables, net of allowance for doubtful accounts of $2 million at December 31, 2021, and 2020, respectively | $ 191 | $ 184
Number of Plants Operated | plant | 25 |

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