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Earnings Per Share (Calculations for EPS) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Basic and diluted net earnings per share:        
Net income attributable to Xylem (in usd) $ 112 $ 113 $ 194 $ 200
Shares        
Weighted average common shares outstanding 180,123 180,072 180,164 180,162
Add: Participating securities [1] 33 34 29 24
Weighted average common shares outstanding — Basic 180,156 180,106 180,193 180,186
Plus incremental shares from assumed conversions:        
Weighted average common shares outstanding — Diluted 180,650 181,349 180,835 181,411
Basic earnings per share (usd per share) $ 0.62 $ 0.63 $ 1.07 $ 1.11
Diluted earnings per share (usd per share) $ 0.62 $ 0.62 $ 1.07 $ 1.10
Stock Options        
Plus incremental shares from assumed conversions:        
Dilutive effect of common shares [2] 438 897 513 845
Restricted Stock        
Plus incremental shares from assumed conversions:        
Dilutive effect of common shares [2] 56 346 129 380
[1] Restricted stock unit awards 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.
[2] 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 13, "Share-Based Compensation Plans", to the condensed consolidated financial statements for further detail on the performance share units.