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Fair Value Measurements - Fair Value Measurement (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Assets
Derivative assets, net	$ 22	$ 22
Liabilities
Securities sold, not yet purchased	896	1,373
Derivative liabilities, net	912	756
Recurring measurement
Assets
Investments	2,042	2,275
Derivative assets, net	22	22
Assets	2,064	2,297
Liabilities
Securities sold, not yet purchased	896	1,373
Derivative liabilities, net	912	756
RFS obligations	438	323
Liabilities	2,246	2,452
Recurring measurement | Level 1
Assets
Investments	2,001	2,203
Assets	2,001	2,203
Liabilities
Securities sold, not yet purchased	896	1,153
Derivative liabilities, net		6
Liabilities	896	1,159
Recurring measurement | Level 2
Assets
Investments		31
Derivative assets, net	22	22
Assets	22	53
Liabilities
Securities sold, not yet purchased		220
Derivative liabilities, net	912	750
RFS obligations	438	323
Liabilities	1,350	1,293
Recurring measurement | Level 3
Assets
Investments	41	41
Assets	41	$ 41
Fair value, nonrecurring | Level 3
Liabilities
Estimated fair value	$ 46

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