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FAIR VALUE MEASUREMENTS (Notes)
6 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
Fair Value Disclosures [Text Block] FAIR VALUE MEASUREMENTS
A summary of the Company's recurring and nonrecurring fair value measurements can be found in Note 23 to the Consolidated Financial Statements included in the 2020 10-K.

Fair Value Measurements on a Recurring Basis
The following table summarizes the bases used to measure certain assets and liabilities at fair value on a recurring basis:

Basis of Fair Value Measurements on a Recurring BasisJun 30, 2021Dec 31, 2020
Quoted Prices in Active Markets for Identical Items
(Level 1)
Significant Other Observable Inputs
(Level 2)
Significant Unobservable Inputs
(Level 3)
TotalQuoted Prices in Active Markets for Identical Items
(Level 1)
Significant Other Observable Inputs
(Level 2)
Total
In millions
Assets at fair value:
Cash equivalents:
Held-to-maturity securities 1
$— $644 $— $644 $— $980 $980 
Money market funds— 728 — 728 — 484 484 
Marketable securities 2
— 105 — 105 — 45 45 
Equity securities 3
32 — — 32 40 — 40 
Debt securities: 3
Government debt 4
— 594 — 594 — 698 698 
Corporate bonds30 999 — 1,029 28 908 936 
Derivatives relating to: 5
Interest rates— 178 — 178 — 44 44 
Foreign currency— 58 — 58 — 113 113 
Commodities12 499 — 511 173 181 
Total assets at fair value$74 $3,805 $— $3,879 $76 $3,445 $3,521 
Liabilities at fair value:    
Long-term debt including debt due within one year 6
$— $18,682 $— $18,682 $— $20,604 $20,604 
Guarantee liability 7
— — 230 230 — — — 
Derivatives relating to: 5
Interest rates— 364 — 364 — 185 185 
Foreign currency— 105 — 105 — 128 128 
Commodities27 441 — 468 201 208 
Total liabilities at fair value$27 $19,592 $230 $19,849 $$21,118 $21,125 
1.The Company's held-to-maturity securities primarily included treasury bills and time deposits.
2.The Company’s investments in marketable securities are included in “Other current assets” in the consolidated balance sheets.
3.The Company’s investments in debt securities, which are primarily available-for-sale, and equity securities are included in “Other investments” in the consolidated balance sheets.
4.U.S. Treasury obligations, U.S. agency obligations, U.S. agency mortgage-backed securities and other municipalities’ obligations.
5.See Note 18 for the classification of derivatives in the consolidated balance sheets.
6.See Note 18 for information on fair value measurements of long-term debt.
7.Estimated liability for TDCC's guarantee of Sadara's debt which is included in "Other noncurrent obligations" in the consolidated balance sheets. See Note 12 for additional information.

For equity securities calculated at net asset value per share (or its equivalent), the Company had $119 million in private market securities and $19 million in real estate at June 30, 2021 ($111 million in private market securities and $19 million in real estate at December 31, 2020). There are no redemption restrictions and the unfunded commitments on these investments were $63 million at June 30, 2021 ($63 million at December 31, 2020).

For liabilities classified as Level 3 measurements, the fair value is based on significant unobservable inputs including assumptions where there is little, if any, market activity. The fair value of the Company’s accrued liability related to the guarantee of Sadara’s debt is in proportion to the Company’s 35 percent ownership interest in Sadara. The estimated fair value of the guarantee was calculated using a "with" and "without" method. The fair value of the debt was calculated "with" the guarantee less the fair value of the debt "without" the guarantee. The "with" and "without" values were calculated using a discounted cash flow method based on contractual cash flows as well as projected prepayments made on the debt by Sadara. See Note 12 for further information on guarantees classified as Level 3 measurements.