Segment Information - Schedule of Reportable Operating Segments, Consolidated Revenue and Segment Operating Income (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Revenue
Total revenue	$ 15,698	$ 13,376	$ 12,479
Expenses
Compensation and benefits	8,283	6,902	6,477
Information technology	539	534	509
Premises	325	294	289
Other expenses	2,716	1,861	1,535
Total operating expenses	11,863	9,591	8,810
Operating income	$ 3,835	$ 3,785	$ 3,669
Operating margin	0.244	0.283	0.294
Interest income	$ 67	$ 31	$ 18
Interest expense	(788)	(484)	(406)
Other income (expense)	348	(163)	(125)
Income before income taxes	3,462	3,169	3,156
Corporate/Eliminations
Revenue
Total revenue	(28)	(12)	(17)
Expenses
Compensation and benefits	127	99	89
Information technology	3	1	2
Premises	0	2	6
Other expenses	442	144	73
Total operating expenses	572	246	170
Operating income	(600)	(258)	(187)
Risk Capital
Expenses
Investment income	307	270	76
Risk Capital | Operating Segments
Revenue
Total revenue	10,517	9,524	8,905
Expenses
Compensation and benefits	5,417	4,800	4,532
Information technology	368	385	361
Premises	215	204	195
Other expenses	1,225	1,189	922
Total operating expenses	7,225	6,578	6,010
Operating income	$ 3,292	$ 2,946	$ 2,895
Operating margin	0.313	0.309	0.325
Human Capital
Expenses
Investment income	$ 8	$ 4	$ 1
Human Capital | Operating Segments
Revenue
Total revenue	5,209	3,864	3,591
Expenses
Compensation and benefits	2,739	2,003	1,856
Information technology	168	148	146
Premises	110	88	88
Other expenses	1,049	528	540
Total operating expenses	4,066	2,767	2,630
Operating income	$ 1,143	$ 1,097	$ 961
Operating margin	0.219	0.284	0.268