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Investment in Cenovus Energy - Narrative (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Debt and Equity Securities, FV-NI [Line Items]      
Gain on investment in Cenovus Energy   $ 0 $ 251
Cenovus Energy Inc      
Debt and Equity Securities, FV-NI [Line Items]      
Gain on investment in Cenovus Energy $ 251    
Common Stock | Cenovus Energy Inc      
Debt and Equity Securities, FV-NI [Line Items]      
Equity securities, shares sold (in shares) 91    
Proceeds received from sale of equity securities $ 1,400