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Fair Value Measurements - Fair Value Measurement (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Assets
Derivative assets, net	$ 3	$ 22
Liabilities
Securities sold, not yet purchased	1,434	1,373
Derivative liabilities, net	989	756
Recurring measurement
Assets
Investments	1,934	2,275
Derivative assets, net	3	22
Assets	1,937	2,297
Liabilities
Securities sold, not yet purchased	1,434	1,373
Derivative liabilities, net	989	756
RFS obligations	93	323
Liabilities	2,516	2,452
Recurring measurement | Level 1
Assets
Investments	1,893	2,203
Assets	1,893	2,203
Liabilities
Securities sold, not yet purchased	1,434	1,153
Derivative liabilities, net		6
Liabilities	1,434	1,159
Recurring measurement | Level 2
Assets
Investments		31
Derivative assets, net	3	22
Assets	3	53
Liabilities
Securities sold, not yet purchased		220
Derivative liabilities, net	989	750
RFS obligations	93	323
Liabilities	1,082	1,293
Recurring measurement | Level 3
Assets
Investments	41	41
Assets	$ 41	$ 41

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