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Summary of Significant Accounting Policies Receivables (Details) $ in Millions | Dec. 31, 2020 USD ($) plant | Dec. 31, 2019 USD ($)
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts Receivable, before Allowance for Credit Loss, Current | $ 161 | $ 111
Income Taxes Receivable, Current | 2 | 35
Other Receivables, Gross, Current | 23 | 19
Allowance for Doubtful Other Receivables, Current | (2) | (1)
Receivables, net of allowance for doubtful accounts of $2 million and $1 million at December 31, 2020, and 2019, respectively | $ 184 | $ 164
Number of Plants Operated | plant | 25 |

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