Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2017
Income Taxes
Assets	$ 83,850,397,000	$ 80,873,509,000
Pre-tax income from foreign operations	0	0	$ 900,000
Valuation allowance changes	$ 0	$ 0	$ 0
Federal statutory tax rate	21.00%	21.00%	21.00%	35.00%
Investing and Servicing Segment | TRS entities
Income Taxes
Assets	$ 3,200,000,000	$ 1,400,000,000