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SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION
 6 Months Ended
Jun. 30, 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 $64 million at both June 30, 2022 and December 31, 2021, respectively.

Accounts and Notes Receivable
Accounts and notes receivable, net, by classification were:
In millions
June 30, 2022December 31, 2021
Accounts and notes receivable:
Trade
$447 $391 
Notes and other
22 11 
Total
$469 $402 
The allowance for expected credit losses was $22 million and $19 million at June 30, 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
June 30, 2022December 31, 2021
Raw materials
$35 $37 
Finished paper and pulp products
191 164 
Operating supplies
72 69 
Other
6 9 
Total$304 $279 
Plants, Properties and Equipment, Net
Accumulated depreciation was $3.6 billion and $3.5 billion at June 30, 2022 and December 31, 2021, respectively. Depreciation expense was $32 million and $31 million for the three months and $62 million and $62 million for the six months ended June 30, 2022 and 2021, respectively.

Non-cash additions to plants, property and equipment included within accounts payable were $6 million each at June 30, 2022 and December 31, 2021.

Interest

Interest payments of $34 million and $1 million were made during the six months ended June 30, 2022 and June 30, 2021, respectively.
Amounts related to interest were as follows:

Three Months Ended
June 30,		Six Months Ended
June 30,
In millions
2022202120222021
Interest expense$20 $1 $39 $1 
Interest income(2)(30)(4)(30)
Capitalized interest cost(1)— (1)— 
Total$17 $(29)$34 $(29)

ASSET RETIREMENT OBLIGATIONS

At both June 30, 2022 and December 31, 2021, we had recorded liabilities of $26 million related to asset retirement obligations. These amounts are included in “Other liabilities.”