Mortgage Banking Activity - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage banking and title income	$ 68	$ 154	$ 129
Gain on sale of mortgage servicing rights	12	0	0
Mortgage banking and title income
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage banking and title income	4	$ 4	$ 2
Sale of mortgage servicing rights	21
Gain on sale of mortgage servicing rights	$ 12