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Basis Of Presentation Equity Method Investments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]          
Equity in earnings of unconsolidated entities $ (53) $ (7) $ (98) $ (15)  
Dividends received from unconsolidated entities     59 2  
Payments to Acquire Equity Method Investments     2 10  
Guaranteed Rate Affinity          
Schedule of Equity Method Investments [Line Items]          
Carrying value of equity method investments 99   99   $ 60
Equity in earnings of unconsolidated entities (51) (5) (95) (12)  
Dividends received from unconsolidated entities     56 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 9   9   $ 9
Equity in earnings of unconsolidated entities $ (2) $ (2) (3) (3)  
Dividends received from unconsolidated entities     $ 3 $ 2