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Related Party Transactions (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Related Party Transactions [Line Items]        
Royalty expense $ 0 $ 1,000,000 $ 0 $ 1,000,000
Directly Charged Corporate Expenses [Member]        
Related Party Transactions [Line Items]        
Corporate expenses   7,000,000   14,000,000
Allocated Corporate Expenses [Member]        
Related Party Transactions [Line Items]        
Corporate expenses   11,000,000   35,000,000
Health Insurance Coverage Premiums [Member]        
Related Party Transactions [Line Items]        
Insurance expense   0   6,000,000
Risk Management Insurance Policies [Member]        
Related Party Transactions [Line Items]        
Insurance expense   1,000,000   $ 2,000,000
ServiceMaster [Member]        
Related Party Transactions [Line Items]        
Royalty fee as a percent of customer revenues       0.175%
Royalty expense   $ 1,000,000   $ 1,000,000