Deposits - Weighted Average Interest Rates for Each Type of Deposit (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Deposits:
Interest-bearing checking and money market accounts	$ 22,511	$ 13,209
Savings accounts	11,645	8,892
Certificates of deposit	12,510	8,424
Non-interest-bearing accounts	12,055	4,534
Total deposits	$ 58,721	$ 35,059
Percent of Total
Interest-bearing checking and money market accounts	38.34%	37.68%
Savings accounts	19.83%	25.36%
Certificates of deposit	21.30%	24.03%
Non-interest-bearing accounts	20.53%	12.93%
Total deposits	100.00%	100.00%
Weighted Average Interest Rate
Interest-bearing checking and money market accounts, weighted average interest rate	2.66%	0.20%
Savings accounts, weighted average interest rate	1.30%	0.35%
Certificates of deposit, weighted average interest rate	2.04%	0.52%
Total deposits, weighted average interest rate	1.71%	0.29%