Deposits - Schedule of Deposits (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Amount
Interest-bearing checking and money market accounts	$ 20,780	$ 30,700
Savings accounts	14,282	8,773
Certificates of deposit	27,324	21,554
Non-interest-bearing accounts	13,484	20,499
Total deposits	$ 75,870	$ 81,526
Percent of Total
Interest-bearing checking and money market accounts	27.40%	37.66%
Savings accounts	18.82%	10.76%
Certificates of deposit	36.01%	26.44%
Non-interest-bearing accounts	17.77%	25.14%
Total deposits	100.00%	100.00%
Weighted Average Interest Rate
Interest-bearing checking and money market accounts	2.89%	3.51%
Savings accounts	3.22%	2.67%
Certificates of deposit	4.75%	4.42%
Non-interest-bearing accounts	0.00%	0.00%
Total deposits	3.12%	2.79%