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SUPPLEMENTAL FINANCIAL STATEMENT INFORMATION (Tables)
 3 Months Ended
Mar. 31, 2025
Disclosure Text Block Supplement [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Accounts and Notes Receivable, Net

In millionsMarch 31, 2025December 31, 2024
Trade (less allowances of $66 and $30, respectively)
$3,959 $2,703 
Other606 263 
Total$4,565 $2,966 
Inventories [Table Text Block]
Inventories

In millionsMarch 31, 2025December 31, 2024
Raw materials$481 $188 
Finished pulp, paper and packaging1,250 934 
Operating supplies753 623 
Other106 39 
Total$2,590 $1,784 

The last-in, first-out inventory method is used to value most of International Paper's U.S. inventories. Approximately 58% of total raw materials and finished products inventories were valued using this method. The last-in, first-out inventory reserve was $341 million and $336 million at March 31, 2025 and December 31, 2024, respectively.
Interest Income and Interest Expense Disclosure [Table Text Block]
Amounts related to interest were as follows: 
 Three Months Ended
March 31,
In millions20252024
Interest expense$133 $109 
Interest income52 63 
Capitalized interest costs5 2