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Investment in Cenovus Energy - Schedule of Gains and Losses Recorded in Other Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Debt and Equity Securities, FV-NI [Line Items]        
Total Net gain on equity securities     $ 251 $ 726
Cenovus Energy Inc        
Debt and Equity Securities, FV-NI [Line Items]        
Total Net gain on equity securities $ 0 $ 418 251 726
Less: Net gain on equity securities sold during the period 0 31 251 60
Unrealized gain on equity securities still held at the reporting date $ 0 $ 387 $ 0 $ 666