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SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION
 6 Months Ended
Jun. 30, 2023
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 $84 million and $80 million at June 30, 2023 and December 31, 2022, respectively.

Accounts and Notes Receivable
Accounts and notes receivable, net, by classification were:
In millions
June 30, 2023December 31, 2022
Accounts and notes receivable:
Trade
$416 $430 
Notes and other
24 20 
Total
$440 $450 
The allowance for expected credit losses was $25 million and $20 million at June 30, 2023 and December 31, 2022, 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, 2023December 31, 2022
Raw materials
$77 $40 
Finished paper and pulp products
293 226 
Operating supplies
104 78 
Other
12 20 
Total$486 $364 
Plants, Properties and Equipment, Net
Accumulated depreciation was $3.7 billion and $3.6 billion at June 30, 2023 and December 31, 2022, respectively. Depreciation expense was $28 million and $27 million for the three months and $58 million and $52 million for the six months ended June 30, 2023 and 2022, respectively.

Non-cash additions to plants, property and equipment included within accounts payable were $9 million and $36 million each at June 30, 2023 and December 31, 2022.

Interest

Interest payments of $37 million and $34 million were made during the six months ended June 30, 2023 and 2022, respectively.

Amounts related to interest were as follows:

Three Months Ended
June 30,		Six Months Ended
June 30,
In millions
2023202220232022
Interest expense (a)
$15 $20 $34 $39 
Interest income (b)
(2)(2)(13)(4)
Capitalized interest cost(1)(1)(2)(1)
Total$12 $17 $19 $34 
(a)    Interest expense for the six months ended June 30, 2023 includes $5 million of debt extinguishment cost related to the tender offer for our 7.00% 2029 Senior Notes.
(b) Interest income for the six months ended June 30, 2023 includes $9 million of interest income related to tax settlements.

ASSET RETIREMENT OBLIGATIONS

At both June 30, 2023 and December 31, 2022, we had recorded liabilities of $26 million related to asset retirement obligations. These amounts are included in “Other liabilities.”