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Related-Party Transactions (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Related Party Transaction [Line Items] |  |  |
Investments in unconsolidated affiliates | $ 124 | $ 129 |
Equity in earnings of unconsolidated affiliates | 5 | 4 | $ 4
Sales Revenue From Wholesale Fuel Sales To Affiliates | 42 | 52 | 25
Bulk Fuel Purchases From Affiliates | $ 1,661 | $ 2,188 | $ 1,705

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