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Basis Of Presentation Equity Method Investments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]          
Equity in earnings of unconsolidated entities $ (36) $ (7) $ (45) $ (8)  
Dividends received from unconsolidated entities     22 1  
Payments to Acquire Equity Method Investments     2 10  
Guaranteed Rate Affinity          
Schedule of Equity Method Investments [Line Items]          
Carrying value of equity method investments 84   84   $ 60
Equity in earnings of unconsolidated entities (35) (6) (44) (7)  
Dividends received from unconsolidated entities     20 0  
Payments to Acquire Equity Method Investments       2  
Other Equity Method Investments          
Schedule of Equity Method Investments [Line Items]          
Carrying value of equity method investments 8   8   $ 9
Equity in earnings of unconsolidated entities $ (1) $ (1) (1) (1)  
Dividends received from unconsolidated entities     $ 2 $ 1