Other Assets - Narrative (Details) - USD ($)	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jan. 01, 2020	Dec. 31, 2019	Feb. 01, 2019
Other Assets [Line Items]
Loans subject to repurchase right from Ginnie Mae	$ 1,171,000,000			$ 560,000,000
Goodwill	120,000,000			120,000,000
Impairment expense		$ 0
REO loans with government guarantee	6,000,000			11,000,000
Payment Deferral | Financial Asset, Equal to or Greater than 90 Days Past Due
Other Assets [Line Items]
Loans subject to repurchase right from Ginnie Mae	818,000,000
Trade accounts receivable
Other Assets [Line Items]
Allowance for credit losses	4,000,000
Cumulative effect, period of adoption, adjustment | Other assets
Other Assets [Line Items]
Allowance for credit losses			$ (2,000,000)
Corporate and other
Other Assets [Line Items]
Impairment expense	$ 4,000,000
Pacific union
Other Assets [Line Items]
Goodwill				40,000,000	$ 40,000,000
Intangible assets				$ 13,000,000