Net Interest Income - Components of Interest Revenue and Interest Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest income:
Interest-bearing deposits with banks	$ 2,869	$ 842	$ (15)
Investment securities:
Investment securities available-for-sale	1,744	724	572
Investment securities held-to-maturity	1,262	979	665
Investment securities purchased under money market liquidity facility	0	0	4
Total investment securities	3,006	1,703	1,241
Securities purchased under resale agreements	312	188	27
Loans	1,862	972	638
Other interest-earning assets	1,131	383	17
Total interest income	9,180	4,088	1,908
Interest expense:
Interest-bearing deposits	4,991	967	(263)
Short term borrowings under money market liquidity facility	0	0	4
Securities sold under repurchase agreements	34	14	0
Federal funds purchased	3	0	0
Short-term borrowings	40	26	2
Long-term debt	888	376	219
Other interest-bearing liabilities	465	161	41
Total interest expense	6,421	1,544	3
Net interest income	$ 2,759	$ 2,544	$ 1,905