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Investment in Cenovus Energy - Narrative (Details) - Cenovus Energy Inc - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]      
Number of shares of common stock outstanding (in shares)     91
Investment owned, percent of issued and outstanding     4.50%
Common stock, outstanding value     $ 1,100
Share price (in dollars per share)     $ 12.28
Common Stock      
Debt and Equity Securities, FV-NI [Line Items]      
Equity securities, shares sold (in shares) 91    
Proceeds received from sale of equity securities   $ 1,400