Investment Information - Other investments, at fair value (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Schedule Of Other Investments [Line Items]
Other investments, at fair value	$ 2,068	$ 1,644
Other investments
Schedule Of Other Investments [Line Items]
Other investments, at fair value	1,404	1,043
Other investments | Lending
Schedule Of Other Investments [Line Items]
Other investments, at fair value	460	406
Other investments | Investment grade fixed income
Schedule Of Other Investments [Line Items]
Other investments, at fair value	418	271
Other investments | Term loan investments
Schedule Of Other Investments [Line Items]
Other investments, at fair value	242	164
Other investments | Private equity
Schedule Of Other Investments [Line Items]
Other investments, at fair value	182	123
Other investments | Credit related funds
Schedule Of Other Investments [Line Items]
Other investments, at fair value	84	56
Other investments | Energy
Schedule Of Other Investments [Line Items]
Other investments, at fair value	18	23
Fixed maturities
Schedule Of Other Investments [Line Items]
Other investments, at fair value	644	554
Equity securities
Schedule Of Other Investments [Line Items]
Other investments, at fair value	7	14
Short-term investments
Schedule Of Other Investments [Line Items]
Other investments, at fair value	$ 13	$ 33