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(Information By Industry Segment, Capital Spending) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Capital Spending $ 1,141 $ 931 $ 480
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Capital Spending 1,105 905 465
Operating Segments [Member] | Industrial Packaging      
Segment Reporting Information [Line Items]      
Capital Spending 928 762 382
Operating Segments [Member] | Global Cellulose Fibers      
Segment Reporting Information [Line Items]      
Capital Spending 177 143 83
Corporate and other      
Segment Reporting Information [Line Items]      
Capital Spending $ 36 $ 26 $ 15