Investment Information - Other investments, at fair value (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Schedule Of Other Investments [Line Items]
Other investments, at fair value	$ 3,206	$ 2,488
Other investments
Schedule Of Other Investments [Line Items]
Other investments, at fair value	2,189	1,777
Lending
Schedule Of Other Investments [Line Items]
Other investments, at fair value	401	427
Investment grade fixed income
Schedule Of Other Investments [Line Items]
Other investments, at fair value	848	754
Term loan investments
Schedule Of Other Investments [Line Items]
Other investments, at fair value	599	272
Private equity
Schedule Of Other Investments [Line Items]
Other investments, at fair value	208	182
Credit related funds
Schedule Of Other Investments [Line Items]
Other investments, at fair value	114	124
Energy
Schedule Of Other Investments [Line Items]
Other investments, at fair value	19	18
Fixed maturities
Schedule Of Other Investments [Line Items]
Other investments, at fair value	973	683
Short term investments
Schedule Of Other Investments [Line Items]
Other investments, at fair value	37	21
Equity securities
Schedule Of Other Investments [Line Items]
Other investments, at fair value	$ 7	$ 7