Segment Information - Schedule of Reportable Operating Segments, Consolidated Revenue and Segment Operating Income (Details) $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Revenue
Total revenue	$ 17,181	$ 15,698	$ 13,376
Expenses
Compensation and benefits	8,985	8,283	6,902
Information technology	568	539	534
Premises	337	325	294
Other expenses	2,947	2,716	1,861
Total operating expenses	12,837	11,863	9,591
Operating income	$ 4,344	$ 3,835	$ 3,785
Operating margin	0.253	0.244	0.283
Interest income	$ 19	$ 67	$ 31
Interest expense	(815)	(788)	(484)
Other income (expense)	1,211	348	(163)
Income before income taxes	4,759	3,462	3,169
Corporate/Eliminations
Revenue
Total revenue	(16)	(28)	(12)
Expenses
Compensation and benefits	93	127	99
Information technology	10	3	1
Premises	5	0	2
Other expenses	378	442	144
Total operating expenses	486	572	246
Operating income	(502)	(600)	(258)
Risk Capital
Expenses
Investment income	262	307	270
Risk Capital | Operating Segments
Revenue
Total revenue	11,290	10,517	9,524
Expenses
Compensation and benefits	5,832	5,417	4,800
Information technology	372	368	385
Premises	216	215	204
Other expenses	1,434	1,225	1,189
Total operating expenses	7,854	7,225	6,578
Operating income	$ 3,436	$ 3,292	$ 2,946
Operating margin	0.304	0.313	0.309
Human Capital
Expenses
Investment income	$ 9	$ 8	$ 4
Human Capital | Operating Segments
Revenue
Total revenue	5,907	5,209	3,864
Expenses
Compensation and benefits	3,060	2,739	2,003
Information technology	186	168	148
Premises	116	110	88
Other expenses	1,135	1,049	528
Total operating expenses	4,497	4,066	2,767
Operating income	$ 1,410	$ 1,143	$ 1,097
Operating margin	0.239	0.219	0.284