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Fair Value Measurements, Nonrecurring (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Mar. 31, 2025 | Dec. 31, 2024
Assets |  |  |  |  |  |  |  |
Long-lived assets, carrying value | [1] | $ 1,249,000,000 |  | $ 1,249,000,000 |  |  |  |
Loss recognized |  | 0 | $ 0 | 1,131,000,000 | [2] | $ 0 |  |
Benicia Refinery [Member] |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Long-lived assets, fair value |  |  |  |  |  |  | $ 722,000,000 |
Long-lived assets, carrying value | [1] | 441,000,000 |  | 441,000,000 |  |  |  |
Loss recognized | [2] |  |  | 901,000,000 |  |  |  |
Wilmington Refinery [Member] |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Long-lived assets, fair value |  |  |  |  |  |  | 847,000,000 |
Long-lived assets, carrying value | [1] | 808,000,000 |  | 808,000,000 |  |  |  |
Loss recognized | [2] |  |  | 230,000,000 |  |  |  |
Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Long-lived assets, fair value |  |  |  |  |  |  | 1,569,000,000 |
Nonrecurring Fair Value Measurements (Textual) |  |  |  |  |  |  |  |
Assets measured at fair value |  | 0 |  | 0 |  |  |  | $ 0
Liabilities measured at fair value |  | $ 0 |  | $ 0 |  |  |  | $ 0
Fair Value, Nonrecurring [Member] | Benicia Refinery [Member] |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Long-lived assets, fair value |  |  |  |  |  |  | 722,000,000 |
Fair Value, Nonrecurring [Member] | Wilmington Refinery [Member] |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Long-lived assets, fair value |  |  |  |  |  |  | 847,000,000 |
Fair Value, Nonrecurring [Member] | Level 1 [Member] |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Long-lived assets, fair value |  |  |  |  |  |  | 0 |
Fair Value, Nonrecurring [Member] | Level 1 [Member] | Benicia Refinery [Member] |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Long-lived assets, fair value |  |  |  |  |  |  | 0 |
Fair Value, Nonrecurring [Member] | Level 1 [Member] | Wilmington Refinery [Member] |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Long-lived assets, fair value |  |  |  |  |  |  | 0 |
Fair Value, Nonrecurring [Member] | Level 2 [Member] |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Long-lived assets, fair value |  |  |  |  |  |  | 0 |
Fair Value, Nonrecurring [Member] | Level 2 [Member] | Benicia Refinery [Member] |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Long-lived assets, fair value |  |  |  |  |  |  | 0 |
Fair Value, Nonrecurring [Member] | Level 2 [Member] | Wilmington Refinery [Member] |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Long-lived assets, fair value |  |  |  |  |  |  | 0 |
Fair Value, Nonrecurring [Member] | Level 3 [Member] |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Long-lived assets, fair value |  |  |  |  |  |  | 1,569,000,000 |
Fair Value, Nonrecurring [Member] | Level 3 [Member] | Benicia Refinery [Member] |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Long-lived assets, fair value |  |  |  |  |  |  | 722,000,000 |
Fair Value, Nonrecurring [Member] | Level 3 [Member] | Wilmington Refinery [Member] |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Long-lived assets, fair value |  |  |  |  |  |  | $ 847,000,000 |
[1] | The carrying values of the Benicia and Wilmington refineries as of September 30, 2025 are lower than the fair values as of March 31, 2025 primarily due to the recognition of depreciation and amortization expense.
[2] | The asset impairment loss was recognized in our Refining segment in March 2025.

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