Investment Information - Other investments, at fair value (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Schedule Of Other Investments [Line Items]
Other investments, at fair value	$ 3,381	$ 3,136
Other investments
Schedule Of Other Investments [Line Items]
Other investments, at fair value	2,144	1,957
Investment grade fixed income
Schedule Of Other Investments [Line Items]
Other investments, at fair value	1,364	1,225
Private equity
Schedule Of Other Investments [Line Items]
Other investments, at fair value	249	250
Lending
Schedule Of Other Investments [Line Items]
Other investments, at fair value	245	220
Term loan investments
Schedule Of Other Investments [Line Items]
Other investments, at fair value	175	173
Credit related funds
Schedule Of Other Investments [Line Items]
Other investments, at fair value	94	87
Equities
Schedule Of Other Investments [Line Items]
Other investments, at fair value	15	0
Energy
Schedule Of Other Investments [Line Items]
Other investments, at fair value	2	2
Fixed maturities
Schedule Of Other Investments [Line Items]
Other investments, at fair value	1,175	1,110
Short term investments
Schedule Of Other Investments [Line Items]
Other investments, at fair value	57	64
Equity securities
Schedule Of Other Investments [Line Items]
Other investments, at fair value	$ 5	$ 5