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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2025
Fair Value Disclosures [Abstract]  
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis
The fair value hierarchy for assets and liabilities measured at fair value at September 30, 2025, and December 31, 2024, is as follows:
Assets and Liabilities Measured at Fair Value on a Recurring Basis
At September 30,
2025
At December 31,
2024
(Millions of dollars)
 TotalLevel 1Level 2Level 3TotalLevel 1Level 2Level 3
Derivatives - not designated$178 $136 $42 $ $137 $127 $10 $— 
Derivatives - designated7 7   — — — — 
   Total Assets at Fair Value $185 $143 $42 $ $137 $127 $10 $— 
Derivatives - not designated158 127 31  136 47 89 — 
Derivatives - designated    17 17 — — 
   Total Liabilities at Fair Value$158 $127 $31 $ $153 $64 $89 $—