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STOCKHOLDERS' EQUITY Part 1 (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2023
Stockholders' Equity Note [Abstract]                
Dividends, Per Share $ 0.83 $ 0.81 $ 2.49 $ 2.43        
Stockholders' Equity Attributable to Parent $ 5,771   $ 5,771   $ 5,779      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 5,843 $ 5,728 5,843 $ 5,728 5,852 $ 5,906 $ 5,699 $ 5,530
Net earnings attributable to Eastman 47 180 369 575        
Net earnings attributable to noncontrolling interest 0 1 1 2        
Net earnings including noncontrolling interest 47 181 370 577        
Cash dividends declared (95) (94) (287) (285)        
Other Comprehensive Income (Loss) 22 24 (17) 41 5      
Share-based Compensation Expense 13 14 38 49        
Stock Option Exercises   4 2 26        
Other 0 0 (12) (9)        
Share Repurchases (50) (100) (100) (200)        
Distributions to Noncontrolling Interest     (3) (1)        
Noncontrolling interest 72 74 72 74 73 71 72 72
Common Stock [Member]                
Stockholders' Equity Attributable to Parent 2 2 2 2 2 2 2 2
Net earnings attributable to Eastman 0 0 0 0        
Cash dividends declared 0 0 0 0        
Other Comprehensive Income (Loss) 0 0 0 0        
Share-based Compensation Expense 0 0 0 0        
Stock Option Exercises   0 0 0        
Other 0 0 0 0        
Share Repurchases 0 0 0 0        
Distributions to Noncontrolling Interest     0 0        
Additional Paid-in Capital [Member]                
Stockholders' Equity Attributable to Parent 2,491 2,435 2,491 2,435 2,463 2,478 2,417 2,368
Net earnings attributable to Eastman 0 0 0 0        
Cash dividends declared 0 0 0 0        
Other Comprehensive Income (Loss) 0 0 0 0        
Share-based Compensation Expense 13 14 38 49        
Stock Option Exercises   4 2 26        
Other 0 0 (12) (8)        
Share Repurchases 0 0 0 0        
Distributions to Noncontrolling Interest     0 0        
Retained Earnings [Member]                
Stockholders' Equity Attributable to Parent 10,095 9,780 10,095 9,780 10,013 10,143 9,694 9,490
Net earnings attributable to Eastman 47 180 369 575        
Cash dividends declared (95) (94) (287) (285)        
Other Comprehensive Income (Loss) 0 0 0 0        
Share-based Compensation Expense 0 0 0 0        
Stock Option Exercises   0 0 0        
Other 0 0 0 0        
Share Repurchases 0 0 0 0        
Distributions to Noncontrolling Interest     0 0        
Accumulated Other Comprehensive Income (Loss) [Member]                
Stockholders' Equity Attributable to Parent (331) (278) (331) (278) (314) (353) (302) (319)
Net earnings attributable to Eastman 0 0 0 0        
Cash dividends declared 0 0 0 0        
Other Comprehensive Income (Loss) 22 24 (17) 41        
Share-based Compensation Expense 0 0 0 0        
Stock Option Exercises   0 0 0        
Other 0 0 0 0        
Share Repurchases 0 0 0 0        
Distributions to Noncontrolling Interest     0 0        
Treasury Stock, Common                
Stockholders' Equity Attributable to Parent (6,486) (6,285) (6,486) (6,285) (6,385) (6,435) (6,184) (6,083)
Net earnings attributable to Eastman 0 0 0 0        
Cash dividends declared 0 0 0 0        
Other Comprehensive Income (Loss) 0 0 0 0        
Share-based Compensation Expense 0 0 0 0        
Stock Option Exercises   0 0 0        
Other (1) (1) (1) (2)        
Share Repurchases (50) (100) (100) (200)        
Distributions to Noncontrolling Interest     0 0        
Parent [Member]                
Stockholders' Equity Attributable to Parent 5,771 5,654 5,771 5,654 $ 5,779 $ 5,835 $ 5,627 $ 5,458
Net earnings attributable to Eastman 47 180 369 575        
Cash dividends declared (95) (94) (287) (285)        
Other Comprehensive Income (Loss) 22 24 (17) 41        
Share-based Compensation Expense 13 14 38 49        
Stock Option Exercises   4 2 26        
Other (1) (1) (13) (10)        
Share Repurchases (50) (100) (100) (200)        
Distributions to Noncontrolling Interest     0 0        
Noncontrolling Interest [Member]                
Net earnings attributable to noncontrolling interest 0 1 1 2        
Cash dividends declared 0 0 0 0        
Other Comprehensive Income (Loss) 0 0 0 0        
Share-based Compensation Expense 0 0 0 0        
Stock Option Exercises   0 0 0        
Other 1 1 1 1        
Share Repurchases $ 0 $ 0 0 0        
Distributions to Noncontrolling Interest     $ (3) $ (1)