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Hedging Activities and Fair Value Measurements, Recurring Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Financial assets [Abstract]
Value before application of CME Rule 814	$ 824	$ 728
Impact of CME Rule 814	(261)	(278)
Total commodity derivatives	563	450
Total	563	450
Financial liabilities [Abstract]
Interest rate derivatives		31
Commodity derivatives:
Value before application of CME Rule 814	797	625
Impact of CME Rule 814	(267)	(154)
Total commodity derivatives	530	471
Total	530	502
Net value before application of CME Rule 814 to commodity hedging portfolio	27
Level 1 [Member]
Financial assets [Abstract]
Value before application of CME Rule 814	329	431
Impact of CME Rule 814	(38)	(147)
Total commodity derivatives	291	284
Total	291	284
Financial liabilities [Abstract]
Interest rate derivatives		0
Commodity derivatives:
Value before application of CME Rule 814	378	317
Impact of CME Rule 814	(87)	(22)
Total commodity derivatives	291	295
Total	291	295
Level 2 [Member]
Financial assets [Abstract]
Value before application of CME Rule 814	494	297
Impact of CME Rule 814	(222)	(131)
Total commodity derivatives	272	166
Total	272	166
Financial liabilities [Abstract]
Interest rate derivatives		31
Commodity derivatives:
Value before application of CME Rule 814	419	308
Impact of CME Rule 814	(180)	(132)
Total commodity derivatives	239	176
Total	239	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	0	0
Impact of CME Rule 814	0	0
Total commodity derivatives	0	0
Total	$ 0	$ 0

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