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Fair Value Disclosures
6 Months Ended
Jun. 30, 2022
Fair Value Disclosures [Abstract]  
Fair Value Disclosures Fair Value Disclosures
The fair value hierarchy prioritizes the inputs to valuation techniques used to measure fair value into three broad levels as follows:
Level 1 – quoted prices in active markets for identical assets or liabilities
Level 2 – quoted prices for similar assets and liabilities in active markets or inputs that are observable
Level 3 – inputs that are unobservable (for example cash flow modeling inputs based on assumptions)
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:
 Fair Value Measurements Using
 Level 1Level 2Level 3
(Millions of dollars)June 30,
2022
December 31,
2021
June 30,
2022
December 31,
2021
June 30,
2022
December 31,
2021
Assets
Derivative assets$— $— $72 $136 $— $— 
Investments and securities*26 42 — — 15 20 
                 Total
$26 $42 $72 $136 15 $20 
Liabilities
Derivative liabilities$— $— $79 $35 $— $— 
* Investments and securities are recorded in prepaid and other current assets and other long-term assets in the company's condensed consolidated balance sheets.

Level 1 investments and securities are marketable securities traded on an exchange. Level 2 investments are based on market prices obtained from independent brokers or determined using quantitative models that use as their basis readily observable market parameters that are actively quoted and can be validated through external sources, including third-party pricing services, brokers and market transactions. Level 3 investments and securities consist of a venture fund. For the valuation, Linde uses the net asset value received as part of the fund's quarterly reporting, which for the most part is not based on quoted prices in active markets. In order to reflect current market conditions, Linde proportionally adjusts these by observable market data (stock exchange prices) or current transaction prices.
Changes in level 3 investments and securities were immaterial.

The fair value of cash and cash equivalents, short-term debt, accounts receivable-net, and accounts payable approximate carrying value because of the short-term maturities of these instruments.
The fair value of long-term debt is estimated based on the quoted market prices for the same or similar issues. Long-term debt is categorized within either Level 1 or Level 2 of the fair value hierarchy depending on the trading volume of the issues and whether or not they are actively quoted in the market as opposed to traded through over-the-counter transactions. At June 30, 2022, the estimated fair value of Linde’s long-term debt portfolio was $11,344 million versus a carrying value of $12,828 million. At December 31, 2021, the estimated fair value of Linde’s long-term debt portfolio was $13,219 million versus a carrying value of $13,044 million. Differences between the carrying value and the fair value are attributable to fluctuations in interest rates subsequent to when the debt was issued and relative to stated coupon rates.