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Summary of Significant Accounting Policies Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Schedule of Equity Method Investments [Line Items]
Income (Loss) from Equity Method Investments	$ (131)	$ (18)	$ 4
Dividends received from unconsolidated entities	101	3	3
Payments to Acquire Equity Method Investments	$ 5	12	15
Guaranteed Rate Affinity
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Unowned Percentage	50.10%
Equity Method Investment, Ownership Percentage	49.90%
Equity Method Investments	$ 90	60
Income (Loss) from Equity Method Investments	(126)	(15)	8
Dividends received from unconsolidated entities	96	0	0
Payments to Acquire Equity Method Investments		2	4
PHH Home Loans
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage				49.90%
Other Equity Method Investments
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	10	9
Income (Loss) from Equity Method Investments	(5)	(3)	(4)
Dividends received from unconsolidated entities	$ 5	$ 5	$ 5

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