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Income Taxes - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
US Treasury Securities
Operating Loss Carryforwards [Line Items]
Debt securities	$ 1,000	$ 921

X

- Definition

Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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