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Subsidiary Debt - HomeServices (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Par value $ 49,759  
Long-term Debt 49,866 $ 39,353
Subsidiary Debt [Member]    
Debt Instrument [Line Items]    
Par value 36,108  
HomeServices [Member] | Subsidiary Debt [Member]    
Debt Instrument [Line Items]    
Par value $ 186  
HomeServices [Member] | HomeServices [Member] | Subsidiary Debt [Member] | Variable-rate Term Loan - Due 2022 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 1.394% 3.299%
Par value [1] $ 186  
Long-term Debt [1] $ 186 $ 213
[1] Term loan amortizes quarterly and variable-rate resets monthly.