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Hedging Activities and Fair Value Measurements, Recurring Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Financial assets [Abstract]
Value before application of CME Rule 814	$ 1,106	$ 728
Impact of CME Rule 814	(318)	(278)
Total commodity derivatives	788	450
Total	788	450
Financial liabilities [Abstract]
Interest rate derivatives		31
Commodity derivatives:
Value before application of CME Rule 814	968	625
Impact of CME Rule 814	(192)	(154)
Total commodity derivatives	776	471
Total	776	502
Net value before application of CME Rule 814 to commodity hedging portfolio	138
Level 1 [Member]
Financial assets [Abstract]
Value before application of CME Rule 814	761	431
Impact of CME Rule 814	(151)	(147)
Total commodity derivatives	610	284
Total	610	284
Financial liabilities [Abstract]
Interest rate derivatives		0
Commodity derivatives:
Value before application of CME Rule 814	603	317
Impact of CME Rule 814	(29)	(22)
Total commodity derivatives	574	295
Total	574	295
Level 2 [Member]
Financial assets [Abstract]
Value before application of CME Rule 814	344	297
Impact of CME Rule 814	(166)	(131)
Total commodity derivatives	178	166
Total	178	166
Financial liabilities [Abstract]
Interest rate derivatives		31
Commodity derivatives:
Value before application of CME Rule 814	351	308
Impact of CME Rule 814	(149)	(132)
Total commodity derivatives	202	176
Total	202	207
Level 3 [Member]
Financial assets [Abstract]
Value before application of CME Rule 814	1	0
Impact of CME Rule 814	(1)	0
Total commodity derivatives	0	0
Total	0	0
Financial liabilities [Abstract]
Interest rate derivatives		0
Commodity derivatives:
Value before application of CME Rule 814	14	0
Impact of CME Rule 814	(14)	0
Total commodity derivatives	0	0
Total	$ 0	$ 0

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