Fair Value Measurements - Fair Value Measurement (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Assets
Derivative contracts, at fair value (asset)	$ 64	$ 805
Liabilities
Securities sold, not yet purchased, at fair value	3,473	6,495
Derivative contracts, at fair value (liability)	979	691
Recurring measurement
Assets
Investments	2,901	6,722
Derivative contracts, at fair value (asset)	64	805
Assets, Fair Value Disclosure	2,965	7,527
Liabilities
Securities sold, not yet purchased, at fair value	3,473	6,495
Derivative contracts, at fair value (liability)	979	691
Other liabilities	329	692
Financial and Nonfinancial Liabilities, Fair Value Disclosure	4,781	7,878
Recurring measurement | Level 1
Assets
Investments	2,730	5,538
Assets, Fair Value Disclosure	2,730	5,538
Liabilities
Securities sold, not yet purchased, at fair value	3,288	6,326
Financial and Nonfinancial Liabilities, Fair Value Disclosure	3,288	6,326
Recurring measurement | Level 2
Assets
Investments	129	1,142
Derivative contracts, at fair value (asset)	64	805
Assets, Fair Value Disclosure	193	1,947
Liabilities
Securities sold, not yet purchased, at fair value	185	169
Derivative contracts, at fair value (liability)	979	691
Other liabilities	329	692
Financial and Nonfinancial Liabilities, Fair Value Disclosure	1,493	1,552
Recurring measurement | Level 3
Assets
Investments	42	42
Assets, Fair Value Disclosure	42	$ 42
Fair value, nonrecurring | Level 3
Liabilities
Estimated fair value	46
Fair value of related party note receivable	$ 11