Investments - Summary of Maximum Loss Exposure (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
Assets	$ 236,700	$ 235,149
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	68,846	58,948
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets	55,415	53,243
Variable Interest Entity, Not Primary Beneficiary [Member] | Investment funds
Variable Interest Entity [Line Items]
Assets	11,885	1,297
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	19,330	1,647
Variable Interest Entity, Not Primary Beneficiary, Consolidated Entity Exclude Affiliated | Investment funds
Variable Interest Entity [Line Items]
Assets	29	1,178
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	323	1,792
Variable Interest Entity, Not Primary Beneficiary, Consolidated Entity Exclude Affiliated | Debt Securities [Member]
Variable Interest Entity [Line Items]
Assets	32,801	31,769
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	37,775	31,622
Variable Interest Entity, Not Primary Beneficiary, Affiliated Entity | Investment funds
Variable Interest Entity [Line Items]
Assets	1,272	7,391
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	1,272	10,922
Variable Interest Entity, Not Primary Beneficiary, Affiliated Entity | Debt Securities [Member]
Variable Interest Entity [Line Items]
Assets	9,088	11,324
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	9,806	12,681
Variable Interest Entity, Not Primary Beneficiary, Affiliated Entity | Equity securities
Variable Interest Entity [Line Items]
Assets	340	284
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	$ 340	$ 284