Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Mortgage and mortgage-related assets	$ 6,764	$ 7,547
Allowance for loan losses and basis in acquired property, net	2,055	1,060
Derivative instruments	1,153	778
Partnership and other equity investments	52	88
Interest-only securities	3,811	3,977
Other, net	295	0
Total deferred tax assets	14,130	13,450
Deferred tax liabilities:
Debt instruments	1,104	377
Other, net	0	358
Total deferred tax liabilities	1,104	735
Valuation allowance	(115)	0
Deferred tax assets, net	$ 12,911	$ 12,715