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SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION
 3 Months Ended
Mar. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION
Temporary Investments
Temporary investments with an original maturity of three months or less and money market funds with greater than three-month maturities but with the right to redeem without notice are treated as cash equivalents and are stated at cost. Temporary investments totaled $101 million and $78 million as of March 31, 2022 and December 31, 2021, respectively.

Accounts and Notes Receivable
Accounts and notes receivable, net, by classification were:
In millions
March 31, 2022December 31, 2021
Accounts and notes receivable:
Trade
$451 $472 
Notes and other
32 18 
Total
$483 $490 
The allowance for expected credit losses was $25 million and $20 million at March 31, 2022 and December 31, 2021, respectively. Based on the Company’s accounting estimates and the facts and circumstances available as of the reporting date, we believe our allowance for expected credit losses is adequate.

Inventories
In millions
March 31, 2022December 31, 2021
Raw materials
$55 $49 
Finished paper and pulp products
215 189 
Operating supplies
97 95 
Other
9 9 
Total$376 $342 
Plants, Properties and Equipment, Net
Accumulated depreciation was $3.6 billion and $3.8 billion at March 31, 2022 and December 31, 2021, respectively. Depreciation expense was $34 million and $35 million for the three months ended March 31, 2022 and 2021, respectively.

Non-cash additions to plants, property and equipment included within accounts payable were $6 million each at March 31, 2022 and December 31, 2021.

Interest

Interest payments of $25 million were made during the three months ended March 31, 2022. There were no interest payments made during the three months ended March 31, 2021.

Amounts related to interest were as follows:

Three Months Ended
March 31,
In millions
20222021
Interest expense$18 $— 
Interest income(2)— 

ASSET RETIREMENT OBLIGATIONS

At both March 31, 2022 and December 31, 2021, we had recorded liabilities of $27 million related to asset retirement obligations. These amounts are included in “Other liabilities.”