Mortgage Loans Held for Sale - Mortgage Loans Held for Sale (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans held for sale – UPB	$ 1,670	$ 4,257
Mark-to-market adjustment(1)	(89)	124
Total mortgage loans held for sale	1,581	4,381
Mortgage Loans Held for Sale, Nonaccrual Basis Unpaid Principal Balance	108	104
Fair Value, Mortgage Loans Held for Sale non-accrual status	93	94
Ginnie mae repurchased loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage Loans Held for Sale, Nonaccrual Basis Unpaid Principal Balance	$ 97	$ 94