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FAIR VALUE MEASUREMENTS (Tables)
12 Months Ended
Dec. 31, 2023
Fair Value Disclosures [Abstract]  
Recurring Fair Value Measurements The following tables set forth our recurring fair value measurements as of the dates indicated:
 December 31, 2023
 Level 1Level 2Level 3Total - GrossNetting (a)Total - Net
 
(Millions of dollars)
Derivative assets      
 Commodity contracts$109 $68 $ $177 $(125)$52 
Total derivative assets$109 $68 $ $177 $(125)$52 
Derivative liabilities
 Commodity contracts$(40)$(44)$ $(84)$84 $ 
Total derivative liabilities$(40)$(44)$ $(84)$84 $ 
(a) - Derivative assets and liabilities are presented in our Consolidated Balance Sheet on a net basis. We net derivative assets and liabilities when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us. At December 31, 2023, we posted no cash and held cash of $41 million with various counterparties, which offsets our derivative net asset position under master netting arrangements as shown in the table above.
 December 31, 2022
 Level 1Level 2Level 3Total - GrossNetting (a)Total - Net
 
(Millions of dollars)
Derivative assets      
Commodity contracts$15 $152 $— $167 $(125)$42 
  Interest-rate contracts— 11 — 11 — 11 
Total derivative assets$15 $163 $— $178 $(125)$53 
Derivative liabilities
Commodity contracts$(38)$(87)$— $(125)$125 $— 
Total derivative liabilities$(38)$(87)$— $(125)$125 $— 
(a) - Derivative assets and liabilities are presented in our Consolidated Balance Sheet on a net basis. We net derivative assets and liabilities when a legally enforceable master-netting arrangement exists between the counterparty to a derivative contract and us. At December 31, 2022, we held no cash and posted $9 million of cash with various counterparties, which is included in other current assets in our Consolidated Balance Sheet.
Reconciliation of Level 3 Fair Value Measurements
The following table sets forth a reconciliation of our Level 3 fair value measurements for the periods indicated:

 Years Ended
December 31,
Derivative Assets (Liabilities)20232022
 
(Millions of dollars)
Net liabilities at beginning of period$ $(114)
Total changes in fair value:
Settlements included in net income (a) 100 
Transfers out of Level 3 derivatives (49)
New Level 3 derivatives included in other comprehensive income (b) 56 
Unrealized change included in other comprehensive income (b) 
Net liabilities at end of period$ $ 
(a) - Included in commodity sales revenues/cost of sales and fuel in our Consolidated Statements of Income.
(b) - Included in change in fair value of derivatives in our Consolidated Statements of Comprehensive Income.