Summary of Significant Accounting Policies Receivables (Details) $ in Millions	Dec. 31, 2020 USD ($) plant	Dec. 31, 2019 USD ($)
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

Number of Plants Operated

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

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Amount, after allowance, of receivables classified as other, due within one year or the operating cycle, if longer.

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The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.

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