Derivatives and Risk Management Activities - Offsetting Asset and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Derivative Assets
Effect of Collateral Netting	$ 3	$ 22
Derivative Liabilities
Effect of Collateral Netting	3	22
Commodity derivatives
Derivative Assets
Effect of Collateral Netting	3	22
Derivative Liabilities
Gross Position - Assets	31	22
Gross Position - Liabilities	(22)	(25)
Effect of Collateral Netting	3	22
Net Carrying Value Presented on the Balance Sheet, Total	12	19
Other current assets | Commodity derivatives
Derivative Assets
Gross Position - Assets	27	25
Gross Position - Liabilities	(16)	(24)
Effect of Collateral Netting	3	22
Net Carrying Value Presented on the Balance Sheet	14	23
Derivative Liabilities
Effect of Collateral Netting	3	22
Other long-term assets, net | Commodity derivatives
Derivative Assets
Gross Position - Assets	1
Gross Position - Liabilities	0
Effect of Collateral Netting	0
Net Carrying Value Presented on the Balance Sheet	1	0
Derivative Liabilities
Effect of Collateral Netting	0
Other current liabilities | Commodity derivatives
Derivative Assets
Effect of Collateral Netting	0
Derivative Liabilities
Gross Position - Assets		(5)
Gross Position - Liabilities		5
Effect of Collateral Netting	0
Net Carrying Value Presented on the Balance Sheet	0	0
Other long-term liabilities and deferred credits | Commodity derivatives
Derivative Assets
Effect of Collateral Netting	0	0
Derivative Liabilities
Gross Position - Assets	3	2
Gross Position - Liabilities	(6)	(6)
Effect of Collateral Netting	0	0
Net Carrying Value Presented on the Balance Sheet	$ (3)	$ (4)