Price Risk Management Activities, Hedging Instruments by Consolidated Balance Sheet Location (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Derivatives Designated as Hedging Instruments [Member] | Commodity Contracts [Member] | Balance Sheet Location [Axis]: us-gaap:ReceivablesNetCurrent
Fair Values of Derivative Instruments
Derivative asset, subject to netting	$ 15	$ 31
Derivative liability, subject to netting	203	7
Derivatives Not Designated as Hedging Instruments [Member]
Fair Values of Derivative Instruments
Derivative asset, total	2,611	460
Derivative liability, total	2,918	452
Derivatives Not Designated as Hedging Instruments [Member] | Commodity Contracts [Member] | Balance Sheet Location [Axis]: us-gaap:ReceivablesNetCurrent
Fair Values of Derivative Instruments
Derivative asset, subject to netting	2,587	459
Derivative liability, subject to netting	2,913	446
Derivatives Not Designated as Hedging Instruments [Member] | Physical Purchase Contracts [Member] | Balance Sheet Location [Axis]: us-gaap:InventoryNet
Fair Values of Derivative Instruments
Derivative contracts, not subject to netting	11	1
Derivative liability, not subject to netting	5	4
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Currency Contracts [Member] | Balance Sheet Location [Axis]: us-gaap:AccruedLiabilitiesCurrent
Fair Values of Derivative Instruments
Derivative contracts, not subject to netting	0	0
Derivative liability, not subject to netting	0	2
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Currency Contracts [Member] | Balance Sheet Location [Axis]: us-gaap:ReceivablesNetCurrent
Fair Values of Derivative Instruments
Derivative contracts, not subject to netting	13	0
Derivative liability, not subject to netting	$ 0	$ 0