Hedging Activities and Fair Value Measurements - Schedule of Recurring Fair Value Measurements (Details) - Fair Value, Recurring - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Commodity derivatives:
Impact of CME Rule 814	$ (353)	$ (223)
Total commodity derivatives	719	575
Total	719	575
Commodity derivatives:
Impact of CME Rule 814	(356)	(221)
Total commodity derivatives	647	495
Total	647	495
Commodity Derivative Before CME Rule 814
Commodity derivatives:
Total commodity derivatives	1,072	798
Commodity derivatives:
Total commodity derivatives	1,003	716
Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1)
Commodity derivatives:
Impact of CME Rule 814	(147)	(56)
Total commodity derivatives	417	299
Total	417	299
Commodity derivatives:
Impact of CME Rule 814	(73)	(43)
Total commodity derivatives	376	248
Total	376	248
Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) | Commodity Derivative Before CME Rule 814
Commodity derivatives:
Total commodity derivatives	564	355
Commodity derivatives:
Total commodity derivatives	449	291
Significant Other Observable Inputs (Level 2)
Commodity derivatives:
Impact of CME Rule 814	(206)	(167)
Total commodity derivatives	301	276
Total	301	276
Commodity derivatives:
Impact of CME Rule 814	(283)	(157)
Total commodity derivatives	270	247
Total	270	247
Significant Other Observable Inputs (Level 2) | Commodity Derivative Before CME Rule 814
Commodity derivatives:
Total commodity derivatives	507	443
Commodity derivatives:
Total commodity derivatives	553	404
Significant Unobservable Inputs (Level 3)
Commodity derivatives:
Impact of CME Rule 814	0	0
Total commodity derivatives	1	0
Total	1	0
Commodity derivatives:
Impact of CME Rule 814	0	(21)
Total commodity derivatives	1	0
Total	1	0
Significant Unobservable Inputs (Level 3) | Commodity Derivative Before CME Rule 814
Commodity derivatives:
Total commodity derivatives	1	0
Commodity derivatives:
Total commodity derivatives	$ 1	$ 21