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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2025
Fair Value Disclosures [Abstract]  
Schedule of Fair Value Hierarchy for Material Financial Instruments and Derivative Assets and Liabilities, Including the Effect of Counterparty Netting
The carrying values and fair values by hierarchy of our financial assets and liabilities, either carried or disclosed at fair value, including any effects of counterparty and collateral netting, were:

 Millions of Dollars
 March 31, 2025
Fair Value HierarchyTotal Fair Value of Gross Assets & LiabilitiesEffect of Counterparty NettingEffect of Collateral NettingDifference in Carrying Value and Fair ValueNet Carrying Value Presented on the Balance Sheet
 Level 1Level 2Level 3
Commodity Derivative Assets
Exchange-cleared instruments$3,141   3,141 (3,126)  15 
Physical forward contracts 85 4 89 (5)  84 
Rabbi trust assets143   143 N/AN/A 143 
Investment in NOVONIX26   26 N/AN/A 26 
$3,310 85 4 3,399 (3,131)  268 
Commodity Derivative Liabilities
Exchange-cleared instruments$3,247   3,247 (3,126)(121)  
Physical forward contracts 72 1 73 (5)  68 
Floating-rate debt 550  550 N/AN/A 550 
Fixed-rate debt, excluding finance leases and software obligations 16,990  16,990 N/AN/A890 17,880 
$3,247 17,612 1 20,860 (3,131)(121)890 18,498 
 Millions of Dollars
 December 31, 2024
Fair Value HierarchyTotal Fair Value of Gross Assets & LiabilitiesEffect of Counterparty NettingEffect of Collateral NettingDifference in Carrying Value and Fair ValueNet Carrying Value Presented on the Balance Sheet
 Level 1Level 2Level 3
Commodity Derivative Assets
Exchange-cleared instruments$2,137 — — 2,137 (2,111)— — 26 
OTC instruments— — — — — 
Physical forward contracts— 70 73 (7)— — 66 
Rabbi trust assets153 — — 153 N/AN/A— 153 
Investment in NOVONIX36 — — 36 N/AN/A— 36 
Foreign currency derivative— 67 — 67 N/AN/A— 67 
$2,326 144 2,473 (2,118)— — 355 
Commodity Derivative Liabilities
Exchange-cleared instruments$2,173 — — 2,173 (2,111)(62)— — 
Physical forward contracts— 45 46 (7)— — 39 
Floating-rate debt— 1,760 — 1,760 N/AN/A— 1,760 
Fixed-rate debt, excluding finance leases and software obligations— 16,913 — 16,913 N/AN/A1,020 17,933 
$2,173 18,718 20,892 (2,118)(62)1,020 19,732