v3.26.1
Equity - Summary of Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance $ 10,980 $ 11,491 $ 10,822 $ 10,647 $ 11,491 $ 10,647
Net income attributable to Xylem 263 193 226 169 456 395
Other comprehensive (loss) income, net of tax (72) (11) 115 98    
Divestiture of non-controlling interest (7)          
Other activity     1      
Dividends declared (101) (105) (98) (98)    
Distribution to minority shareholders   (1) (2)      
Net income attributable to non-controlling interests 1   (2) (1)    
Repurchase of common stock (655) (586)        
Stock incentive plan activity 15 (1) 15 5    
Ending balance $ 10,424 $ 10,980 $ 11,081 $ 10,822 10,424 11,081
Dividends declared (in dollars per share) $ 0.43 $ 0.43 $ 0.40 $ 0.40    
Common Stock            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance $ 3 $ 3 $ 3 $ 3 3 3
Ending balance 3 3 3 3 3 3
Capital in Excess of Par Value            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance 8,772 8,759 8,705 8,687 8,759 8,687
Stock incentive plan activity 15 13 15 18    
Ending balance 8,787 8,772 8,720 8,705 8,787 8,720
Retained Earnings            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance 3,794 3,706 3,211 3,140 3,706 3,140
Net income attributable to Xylem 263 193 226 169    
Dividends declared (101) (105) (98) (98)    
Ending balance 3,956 3,794 3,339 3,211 3,956 3,339
Accumulated Other Comprehensive (Loss) Income            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance (229) (220) (337) (435) (220) (435)
Other comprehensive (loss) income, net of tax (73) (9) 115 98    
Ending balance (302) (229) (222) (337) (302) (222)
Treasury Stock            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance (1,368) (768) (766) (753) (768) (753)
Repurchase of common stock (655) (586)        
Stock incentive plan activity   (14) 0 (13)    
Ending balance (2,023) (1,368) (766) (766) (2,023) (766)
Non-Controlling Interest            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance 8 11 6 5 11 5
Other comprehensive (loss) income, net of tax 1 (2)        
Divestiture of non-controlling interest (7)          
Other activity     1      
Distribution to minority shareholders   (1) (2)      
Net income attributable to non-controlling interests 1   (2) (1)    
Ending balance $ 3 $ 8 $ 7 $ 6 $ 3 $ 7