Subsequent Event (Details) - USD ($) $ in Millions		3 Months Ended
	Apr. 27, 2022	Mar. 31, 2022	Mar. 31, 2021
Subsequent Event [Line Items]
Proceeds from sale of loans		$ 95	$ 3,160
Net proceeds from sales of loans held for investment, principal		89	2,970
Net proceeds from sales of loans held for investment, capitalized interest		$ 6	$ 193
Subsequent Event
Subsequent Event [Line Items]
Proceeds from sale of loans	$ 2,000
Net proceeds from sales of loans held for investment, principal	1,900
Net proceeds from sales of loans held for investment, capitalized interest	$ 130