Fair Value Measurements - Fair Value Measurement (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Assets
Derivative assets, net	$ 7	$ 22
Liabilities
Securities sold, not yet purchased	1,382	1,373
Derivative liabilities, net	595	756
Recurring measurement
Assets
Investments	2,149	2,275
Derivative assets, net	7	22
Assets	2,156	2,297
Liabilities
Securities sold, not yet purchased	1,382	1,373
Derivative liabilities, net	595	756
Other liabilities	72	323
Liabilities	2,049	2,452
Recurring measurement | Level 1
Assets
Investments	2,108	2,203
Assets	2,108	2,203
Liabilities
Securities sold, not yet purchased	1,382	1,153
Derivative liabilities, net		6
Liabilities	1,382	1,159
Recurring measurement | Level 2
Assets
Investments		31
Derivative assets, net	7	22
Assets	7	53
Liabilities
Securities sold, not yet purchased		220
Derivative liabilities, net	595	750
Other liabilities	72	323
Liabilities	667	1,293
Recurring measurement | Level 3
Assets
Investments	41	41
Assets	$ 41	$ 41