Derivative Instruments and Hedging Activities - Schedule of Balance Sheet Locations And Related Fair Values Of Outstanding Derivative Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Derivative [Line Items]
Net Assets Recognized in Balance Sheet	$ 6	$ 19
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Prepayments and other	Prepayments and other
Net Liabilities Recognized in Balance Sheet	$ 6	$ 2
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Accrued Liabilities, Current	Accrued Liabilities, Current
Derivatives designated as cash flow hedging instruments:
Derivative [Line Items]
Gross Assets	$ 2
Gross Liabilities Offset in Balance Sheet	0
Net Assets Recognized in Balance Sheet	2
Gross Liabilities	1
Gross Assets Offset in Balance Sheet	0
Net Liabilities Recognized in Balance Sheet	1
Derivatives designated as cash flow hedging instruments: | WTI crude oil price swaps | Long
Derivative [Line Items]
Gross Assets	0
Gross Liabilities Offset in Balance Sheet	0
Net Assets Recognized in Balance Sheet	0
Gross Liabilities	1
Gross Assets Offset in Balance Sheet	0
Net Liabilities Recognized in Balance Sheet	1
Derivatives designated as cash flow hedging instruments: | Sub-octane gasoline price swaps | Short
Derivative [Line Items]
Gross Assets	2
Gross Liabilities Offset in Balance Sheet	0
Net Assets Recognized in Balance Sheet	2
Gross Liabilities	0
Gross Assets Offset in Balance Sheet	0
Net Liabilities Recognized in Balance Sheet	0
Derivatives not designated as cash flow hedging instruments:
Derivative [Line Items]
Gross Assets	4	$ 19
Gross Liabilities Offset in Balance Sheet	0	0
Net Assets Recognized in Balance Sheet	4	19
Gross Liabilities	5	2
Gross Assets Offset in Balance Sheet	0	0
Net Liabilities Recognized in Balance Sheet	5	2
Derivatives not designated as cash flow hedging instruments: | NYMEX futures contracts
Derivative [Line Items]
Gross Assets		0
Gross Liabilities Offset in Balance Sheet		0
Net Assets Recognized in Balance Sheet		0
Gross Liabilities		1
Gross Assets Offset in Balance Sheet		0
Net Liabilities Recognized in Balance Sheet		1
Derivatives not designated as cash flow hedging instruments: | Commodity forward contracts | Long
Derivative [Line Items]
Gross Assets	1	1
Gross Liabilities Offset in Balance Sheet	0	0
Net Assets Recognized in Balance Sheet	1	1
Gross Liabilities	1	1
Gross Assets Offset in Balance Sheet	0	0
Net Liabilities Recognized in Balance Sheet	1	1
Derivatives not designated as cash flow hedging instruments: | Foreign currency forward contracts
Derivative [Line Items]
Gross Assets	3	18
Gross Liabilities Offset in Balance Sheet	0	0
Net Assets Recognized in Balance Sheet	3	18
Gross Liabilities	4	0
Gross Assets Offset in Balance Sheet	0	0
Net Liabilities Recognized in Balance Sheet	$ 4	$ 0