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Fair Value Disclosures (Tables)
12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis
The following table summarizes assets and liabilities measured at fair value on a recurring basis at December 31, 2020 and 2019: 
 Fair Value Measurements Using
(Millions of dollars)Level 1Level 2Level 3
 202020192020201920202019
Assets
Derivative assets$— $— $200 $167 $— $— 
Investments and securities *21 18 — — 47 28 
Total$21 $18 $200 $167 $47 $28 
Liabilities
Derivative liabilities$— $— $81 $99 $— $— 
*Investments and securities are recorded in prepaid and other current assets and other long-term assets in the company's consolidated balance sheets.