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.