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Restructuring and Asset Impairment Charges (Components of Restructuring Charges and Segment Allocation) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Severance and other charges |  |  | $ 10 | $ 36 | $ 51
Lease related charges |  |  | 0 | 0 | 1
Asset impairment |  |  | 1 | 18 | 0
Other restructuring charges |  |  | 1 | 1 | 2
Reversal of restructuring accruals |  |  | (6) | (1) | (1)
Total restructuring charges |  |  | 6 | 54 | 53
Asset impairment charges |  |  | 1 | 21 | 10
Total restructuring and asset impairment charges |  |  | 7 | 75 | 63
Water Infrastructure |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and asset impairment charges |  |  | 8 | 20 | 20
Applied Water |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and asset impairment charges |  |  | 2 | 4 | 5
Measurement & Control Solutions |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Asset impairment charges | $ 11 | $ 10 |  |  |
Restructuring and asset impairment charges |  |  | $ (3) | $ 51 | $ 38

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