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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Assets and Liabilities Measured at Fair Value on a Recurring Basis
The fair value hierarchy for assets and liabilities measured at fair value on a recurring basis at September 30, 2021, and December 31, 2020, is as follows:
Assets and Liabilities Measured at Fair Value on a Recurring Basis
(Millions of dollars)
 At September 30, 2021At December 31, 2020
 TotalLevel 1Level 2Level 3TotalLevel 1Level 2Level 3
Marketable Securities$34 $34 $ $ $31 $31 $— $— 
Derivatives - not designated494 494   74 37 37 — 
Total Assets at Fair Value
$528 $528 $ $ $105 $68 $37 $— 
Derivatives - not designated281 144 137  173 58 115 — 
Derivatives - designated4 4       
Total Liabilities at Fair Value
$285 $148 $137 $ $173 $58 $115 $— 
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
The fair value hierarchy for assets and liabilities measured at fair value on a nonrecurring basis at September 30, 2021, is as follows:
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
(Millions of dollars)
 At September 30, 2021
Before - Tax Loss
 Three Months EndedNine Months Ended
TotalLevel 1Level 2Level 3
Properties, plant and equipment, net (held and used)$— $— $— $— $— $— 
Properties, plant and equipment, net (held for sale)— — — — — — 
Investments and advances16 — — 16 26 
Total Assets at Fair Value
$16 $ $ $16 $5 $26