Sales of Receivables and Servicing Rights - Additional Information (Details) - USD ($) $ in Billions	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Transfers and Servicing [Abstract]
Servicing of residential mortgage loans for other investors	$ 102.7	$ 89.2
Weighted-average coupon of the MSR portfolio (as a percent)	3.53%	3.45%