Net Interest Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Interest income:
Interest-bearing deposits with banks	$ 641	$ 9
Investment securities:
Investment securities available-for-sale	347	154
Investment securities held-to-maturity	321	171
Total investment securities	668	325
Securities purchased under resale agreements	76	10
Loans	397	172
Other interest-earning assets	245	5
Total interest income	2,027	521
Interest expense:
Interest-bearing deposits	953	(63)
Securities sold under repurchase agreements	9	0
Federal funds purchased	1	0
Short-term borrowings	11	0
Long-term debt	184	65
Other interest-bearing liabilities	103	10
Interest expense	1,261	12
Net interest income	$ 766	$ 509