Net Interest Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Interest income:
Interest-bearing deposits with banks	$ 202	$ 0	$ 281	$ (13)
Investment securities:
Investment securities available-for-sale	176	150	452	435
Investment securities held-to-maturity	271	158	672	501
Investment securities purchased under money market liquidity facility	0	0	0	4
Total investment securities	447	308	1,124	940
Securities purchased under resale agreements	57	6	105	19
Loans	256	168	627	466
Other interest-earning assets	139	5	189	13
Total interest income	1,101	487	2,326	1,425
Interest expense:
Interest-bearing deposits	300	(62)	260	(196)
Short-term borrowings under money market liquidity facility	0	0	0	4
Securities sold under repurchase agreements	2	0	5	0
Other short-term borrowings	0	0	1	1
Long-term debt	97	51	234	165
Other interest-bearing liabilities	42	11	73	30
Interest expense	441	0	573	4
Net interest income	$ 660	$ 487	$ 1,753	$ 1,421