Investments - Fixed maturity securities available-for-sale (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Equity Method Investments, Joint Ventures, Investments, Debt And Equity Securities [Abstract]
Available for sale debt securities	$ 3,521	$ 4,405
Securities collateral pledged to us	$ 3,521	$ 4,405

The carrying value as of the balance sheet date of the assets received as collateral against securities loaned to other broker-dealers. Borrowers of securities generally are required to provide collateral to the lenders of securities, commonly cash but sometimes other securities or standby letters of credit, with a value slightly higher than that of the securities borrowed. In instances where the entity is permitted to sell or re-pledge these securities, the entity reports the fair value of the collateral received and the related obligation to return the collateral as a liability.

No definition available.

Name:	us-gaap_SecuritiesReceivedAsCollateral
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant