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Supplemental Disclosures to the Balance Sheets and Statements of Cash Flows - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Deferred financing costs, non-current, net of amortization $ 11 $ 16
Greenhouse gas liability $ 33 $ 15