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Restructuring Charges (Estimated Restructuring Costs) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
2021 Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total expected costs | $ 5 |  |
Restructuring costs incurred during period | 1 | $ 1 |
Total expected costs remaining | 3 |  |
2020 Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total expected costs |  |  | $ 68
Restructuring costs incurred during period | 2 | 4 | 53
Total expected costs remaining |  |  | 9
Operating Segments | Water Infrastructure | 2021 Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total expected costs | 5 |  |
Restructuring costs incurred during period | 1 | 1 |
Total expected costs remaining | 3 |  |
Operating Segments | Water Infrastructure | 2020 Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total expected costs |  |  | 25
Restructuring costs incurred during period | 2 | 2 | 19
Total expected costs remaining |  |  | 2
Operating Segments | Applied Water | 2021 Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total expected costs | 0 |  |
Restructuring costs incurred during period | 0 | 0 |
Total expected costs remaining | 0 |  |
Operating Segments | Applied Water | 2020 Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total expected costs |  |  | 8
Restructuring costs incurred during period | 0 | 1 | 4
Total expected costs remaining |  |  | 3
Operating Segments | Measurement & Control Solutions | 2021 Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total expected costs | 0 |  |
Restructuring costs incurred during period | 0 | 0 |
Total expected costs remaining | 0 |  |
Operating Segments | Measurement & Control Solutions | 2020 Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total expected costs |  |  | 33
Restructuring costs incurred during period | 0 | 1 | 30
Total expected costs remaining |  |  | 2
Corporate | 2021 Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total expected costs | 0 |  |
Restructuring costs incurred during period | 0 | 0 |
Total expected costs remaining | 0 |  |
Corporate | 2020 Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total expected costs |  |  | 2
Restructuring costs incurred during period | $ 0 | $ 0 | 0
Total expected costs remaining |  |  | $ 2

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- Definition Amount expected to be recognized in earnings for the specified restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(1)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(d)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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