Net Interest Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Interest income:
Interest-bearing deposits with banks	$ 696	$ 70	$ 1,338	$ 79
Investment securities:
Investment securities available-for-sale	408	122	755	276
Investment securities held-to-maturity	320	230	640	401
Total investment securities	728	352	1,395	677
Securities purchased under resale agreements	81	38	157	48
Loans	442	199	839	371
Other interest-earning assets	285	45	530	50
Total interest income	2,232	704	4,259	1,225
Interest expense:
Interest-bearing deposits	1,193	23	2,147	(40)
Securities sold under repurchase agreements	13	3	22	3
Short-term borrowings	20	1	32	1
Long-term debt	209	72	393	137
Other interest-bearing liabilities	106	21	208	31
Interest expense	1,541	120	2,802	132
Net interest income	$ 691	$ 584	$ 1,457	$ 1,093