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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Basic and diluted net earnings per share:        
Net income attributable to Xylem (in usd) $ 113 $ 31 $ 200 $ 69
Shares        
Weighted average common shares outstanding 180,072 179,933 180,162 180,043
Add: Participating securities [1] 34 32 24 29
Weighted average common shares outstanding — Basic 180,106 179,965 180,186 180,072
Plus incremental shares from assumed conversions:        
Weighted average common shares outstanding — Diluted 181,349 180,607 181,411 180,950
Basic earnings per share (usd per share) $ 0.63 $ 0.17 $ 1.11 $ 0.38
Diluted earnings per share (usd per share) $ 0.62 $ 0.17 $ 1.10 $ 0.38
Stock Options        
Plus incremental shares from assumed conversions:        
Dilutive effect of common shares [2] 897 563 845 644
Restricted Stock        
Plus incremental shares from assumed conversions:        
Dilutive effect of common shares [2] 346 79 380 234
[1] Restricted stock unit awards containing rights to non-forfeitable dividends that participate in undistributed earnings with common shareholders 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.