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Basis of Presentation, Principles of Consolidation, and Summary of Significant Accounting Policies - Reconciliation of Cash and Cash Equivalents (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025	Jun. 30, 2025	Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents	$ 1,060	$ 1,015	$ 1,057
Restricted cash and restricted cash equivalents (included in segregated cash and investments)	4,397		4,887
Total cash, cash equivalents, restricted cash, and restricted cash equivalents	$ 5,457	$ 5,505	$ 5,944	$ 3,924

Amount of cash and cash equivalent restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

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