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Revenues (Narrative) (Details) - USD ($) $ in Millions		12 Months Ended
Revenues (Narrative) (Details) - USD ($) $ in Millions	Jan. 01, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Retained earnings		$ 291	$ 156
Revenue recognized	$ 6	62
Deferred revenue		101	101	$ 101
Impact of adopting ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Retained earnings			$ 156
Net reduction to retained earnings	$ 16
Impact of adopting ASC 606 [Member] \| Scenario, Adjustment [Member]
Disaggregation of Revenue [Line Items]
Retained earnings		3
European Pest Control [Member]
Disaggregation of Revenue [Line Items]
Deferred revenue		$ 15