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Summary of Significant Accounting Policies Receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable, before Allowance for Credit Loss, Current $ 111 $ 88
Income Taxes Receivable, Current 35 16
Other Receivables, Gross, Current 19 25
Allowance for Doubtful Other Receivables, Current (1) (1)
Receivables, net of allowance for doubtful accounts of $1 million at December 31, 2019 and 2018 $ 164 $ 128