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Earnings Per Share
 9 Months Ended
Sep. 30, 2025
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
The following is a reconciliation of the shares used in calculating basic and diluted net earnings per share:
Three Months EndedNine Months Ended
 September 30,September 30,
2025202420252024
Net income attributable to Xylem (in millions)$227 $217 $622 $564 
Shares (in thousands):
Weighted average common shares outstanding243,436 242,911 243,297 242,425 
Add: Participating securities (a)18 21 22 28 
Weighted average common shares outstanding — Basic243,454 242,932 243,319 242,453 
Plus incremental shares from assumed conversions: (b)
Dilutive effect of stock options358 419 341 574 
Dilutive effect of restricted stock units and performance share units279 399 250 410 
Weighted average common shares outstanding — Diluted244,091 243,750 243,910 243,437 
Basic earnings per share$0.93 $0.89 $2.56 $2.33 
Diluted earnings per share$0.93 $0.89 $2.55 $2.32 
(a)Restricted stock units containing rights to non-forfeitable dividends that participate in undistributed earnings with common stockholders are considered participating securities for purposes of computing earnings per share.
(b)Incremental shares from stock options, restricted stock units and performance share units are computed by the treasury stock method. The weighted average shares listed below were not included in the computation of diluted earnings per share because to do so would have been anti-dilutive for the periods presented or were otherwise excluded under the treasury stock method. The treasury stock method calculates dilution assuming the exercise of all in-the-money options and vesting of restricted stock units and performance share units, reduced by the repurchase of shares with the proceeds from the assumed exercises and unrecognized compensation expense for outstanding awards. Performance share units will be included in the treasury stock calculation of diluted earnings per share upon achievement of underlying performance or market conditions at the end of the reporting period. See Note 15, "Share-Based Compensation Plans," to the condensed consolidated financial statements for further detail on the performance share units.
Three Months EndedNine Months Ended
 September 30,September 30,
(in thousands)2025202420252024
Stock options903 766 925 1,000 
Restricted stock units339 391 373 424 
Performance share units97 199 170 284