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Equity Method Investments (Details) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 01, 2022 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Payments to acquire business |  |  |  | $ 74 |  | $ 0
Book value of equity method investment |  |  |  | 25 | [1] | 0
Net gain on disposal of assets |  | $ 39 | $ 0 | $ 21 |  | $ 3
Watson Cogeneration Company |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Remaining ownership interest purchased | 0.49 |  |  |  |  |
Payments to acquire business | $ 59 |  |  |  |  |
Fair value of assets contributed | 62 |  |  |  |  |
Book value of equity method investment | $ 25 |  |  |  |  |
Ownership percentage | 51.00% |  |  |  |  |
Net gain on disposal of assets | $ 37 |  |  |  |  |
[1] | Represents the book value of MPC’s equity method investment in Watson Cogeneration Company at June 1, 2022 prior to MPC buying out the remaining interest in Watson Cogeneration Company. See Note 14 for additional information.

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