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Subsidiary Debt Subsidiary Debt - HomeServices (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Par value $ 39,634  
Long-term Debt 39,353 $ 36,774
Subsidiary Debt [Member]    
Debt Instrument [Line Items]    
Par value 30,883  
HomeServices [Member] | Variable-rate Term Loan - Due 2022 [Member]    
Debt Instrument [Line Items]    
Par value [1] 213  
HomeServices [Member] | Subsidiary Debt [Member]    
Debt Instrument [Line Items]    
Par value $ 213  
HomeServices [Member] | Subsidiary Debt [Member] | Variable-rate Term Loan - Due 2022 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 3.299% 4.022%
HomeServices [Member] | HomeServices [Member] | Subsidiary Debt [Member] | Variable-rate Term Loan - Due 2022 [Member]    
Debt Instrument [Line Items]    
Long-term Debt [1] $ 213 $ 233
[1] (1)Term loan amortizes quarterly and variable-rate resets monthly.