Investment Securities - Continuous Unrealized Loss Position (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Available-for-sale securities
Less than 12 months, Fair value	$ 20,904	$ 16,538
Less than 12 months, Gross unrealized losses	846	65
12 months or more, Fair value	8,519	1,336
12 months or more, Gross unrealized losses	746	42
Total fair value	29,423	17,874
Total gross unrealized losses	1,592	107
Total mortgage-backed securities
Available-for-sale securities
Less than 12 months, Fair value	5,166	2,993
Less than 12 months, Gross unrealized losses	170	7
12 months or more, Fair value	1,143	394
12 months or more, Gross unrealized losses	123	13
Total fair value	6,309	3,387
Total gross unrealized losses	293	20
U.S. GSEs and government agencies
Available-for-sale securities
Total fair value	9,600	2,200
Residential: U.S.
Available-for-sale securities
Less than 12 months, Fair value	1,187	303
Less than 12 months, Gross unrealized losses	71	1
12 months or more, Fair value	260	45
12 months or more, Gross unrealized losses	40	1
Total fair value	1,447	348
Total gross unrealized losses	111	2
Residential: Non-U.S.
Available-for-sale securities
Less than 12 months, Fair value	2,848	133
Less than 12 months, Gross unrealized losses	25	1
12 months or more, Fair value	70	0
12 months or more, Gross unrealized losses	2	0
Total fair value	2,918	133
Total gross unrealized losses	27	1
Commercial
Available-for-sale securities
Less than 12 months, Fair value	1,131	2,557
Less than 12 months, Gross unrealized losses	74	5
12 months or more, Fair value	813	349
12 months or more, Gross unrealized losses	81	12
Total fair value	1,944	2,906
Total gross unrealized losses	155	17
Obligations of U.S. states and municipalities
Available-for-sale securities
Less than 12 months, Fair value	3,051	120
Less than 12 months, Gross unrealized losses	241	2
12 months or more, Fair value	364	0
12 months or more, Gross unrealized losses	162	0
Total fair value	3,415	120
Total gross unrealized losses	403	2
Non-U.S. government debt securities
Available-for-sale securities
Less than 12 months, Fair value	6,941	5,060
Less than 12 months, Gross unrealized losses	321	37
12 months or more, Fair value	3,848	510
12 months or more, Gross unrealized losses	357	9
Total fair value	10,789	5,570
Total gross unrealized losses	678	46
Corporate debt securities
Available-for-sale securities
Less than 12 months, Fair value	150	166
Less than 12 months, Gross unrealized losses	2	1
12 months or more, Fair value	207	46
12 months or more, Gross unrealized losses	22	18
Total fair value	357	212
Total gross unrealized losses	24	19
Asset-backed securities: Collateralized loan obligations
Available-for-sale securities
Less than 12 months, Fair value	3,010	8,110
Less than 12 months, Gross unrealized losses	61	18
12 months or more, Fair value	2,701	208
12 months or more, Gross unrealized losses	64	0
Total fair value	5,711	8,318
Total gross unrealized losses	125	18
Asset-backed securities: Other
Available-for-sale securities
Less than 12 months, Fair value	2,586	89
Less than 12 months, Gross unrealized losses	51	0
12 months or more, Fair value	256	178
12 months or more, Gross unrealized losses	18	2
Total fair value	2,842	267
Total gross unrealized losses	$ 69	$ 2