Investments - Asset and Liability Information for Consolidated VIEs (Details) - USD ($) $ in Millions	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Summary of Investment Holdings [Line Items]
Debt securities, trading	$ 72		$ 68
Equity securities	212		394
Other invested assets	2,673		2,466
Other assets	554		1,294
Total assets	337,776		330,255
Securities lending payable	15		19
Total liabilities	327,492		319,921
Equity	10,284	$ 10,356	10,334	$ 9,423	$ 9,467	$ 9,378
Related Party
Summary of Investment Holdings [Line Items]
Notes issued by consolidated VIEs, at fair value under fair value option	2,041		1,988
Nonrelated Party
Summary of Investment Holdings [Line Items]
Notes issued by consolidated VIEs, at fair value under fair value option	3,068		2,277
Variable Interest Entity, Primary Beneficiary
Summary of Investment Holdings [Line Items]
Debt securities, at fair value under fair value option	2,409		2,037
Debt securities, trading	72		68
Equity securities	6		7
Other invested assets	505		396
Cash and cash equivalents	112		93
Other assets	59		49
Total assets	3,163		2,650
Other liabilities	428		98
Securities lending payable	1		2
Total liabilities	2,470		2,088
Equity	200		164
Variable Interest Entity, Primary Beneficiary | Related Party
Summary of Investment Holdings [Line Items]
Notes issued by consolidated VIEs, at fair value under fair value option	2,041		1,988
Variable Interest Entity, Primary Beneficiary | Nonrelated Party
Summary of Investment Holdings [Line Items]
Notes issued by consolidated VIEs, at fair value under fair value option	$ 2,469		$ 2,086