Investments - Summary of Maximum Loss Exposure (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Variable Interest Entity [Line Items]
Assets	$ 332,627	$ 300,579
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	106,692	92,042
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets	90,940	79,636
Variable Interest Entity, Not Primary Beneficiary [Member] | Investment funds
Variable Interest Entity [Line Items]
Assets	17,726	15,927
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	24,270	22,240
Variable Interest Entity, Not Primary Beneficiary, Consolidated Entity Exclude Affiliated | Investment funds
Variable Interest Entity [Line Items]
Assets	107	109
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	864	876
Variable Interest Entity, Not Primary Beneficiary, Consolidated Entity Exclude Affiliated | Fixed maturity securities
Variable Interest Entity [Line Items]
Assets	54,831	48,155
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	59,155	50,623
Variable Interest Entity, Not Primary Beneficiary, Affiliated Entity | Investment funds
Variable Interest Entity [Line Items]
Assets	1,619	1,632
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	2,653	2,377
Variable Interest Entity, Not Primary Beneficiary, Affiliated Entity | Fixed maturity securities
Variable Interest Entity [Line Items]
Assets	16,343	13,495
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	19,436	15,608
Variable Interest Entity, Not Primary Beneficiary, Affiliated Entity | Equity securities
Variable Interest Entity [Line Items]
Assets	314	318
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	$ 314	$ 318