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SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION
9 Months Ended
Sep. 30, 2021
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 $7 million and $36 million as of September 30, 2021 and December 31, 2020, respectively.

Accounts and Notes Receivable
Accounts and notes receivable, net, by classification were:
In millions
September 30, 2021December 31, 2020
Accounts and notes receivable:
Trade
$401 $379 
Notes
1 
Other
20 19 
Total
$422 $400 
The allowance for expected credit losses was $25 million and $30 million at September 30, 2021 and December 31, 2020, 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
September 30, 2021December 31, 2020
Raw materials
$44 $50 
Finished paper and pulp products
189 171 
Operating supplies
97 102 
Other
14 19 
$344 $342 
Plants, Properties and Equipment, Net
Accumulated depreciation was $3.8 billion each at September 30, 2021 and December 31, 2020.

Non-cash additions to plants, property and equipment included within accounts payable were $11 million each at September 30, 2021 and December 31, 2020.