Investments - Summary of Maximum Loss Exposure (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Assets	$ 269,763	$ 243,931
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	87,007	74,432
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets	73,307	61,578
Variable Interest Entity, Not Primary Beneficiary [Member] | Investment funds
Variable Interest Entity [Line Items]
Assets	15,090	12,480
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	21,270	20,278
Variable Interest Entity, Not Primary Beneficiary, Consolidated Entity Exclude Affiliated | Investment funds
Variable Interest Entity [Line Items]
Assets	124	79
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	593	340
Variable Interest Entity, Not Primary Beneficiary, Consolidated Entity Exclude Affiliated | AFS securities
Variable Interest Entity [Line Items]
Assets	42,685	37,454
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	46,101	40,992
Variable Interest Entity, Not Primary Beneficiary, Affiliated Entity | Investment funds
Variable Interest Entity [Line Items]
Assets	1,604	1,569
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	2,325	2,253
Variable Interest Entity, Not Primary Beneficiary, Affiliated Entity | AFS securities
Variable Interest Entity [Line Items]
Assets	13,500	9,717
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	16,414	10,290
Variable Interest Entity, Not Primary Beneficiary, Affiliated Entity | Equity securities
Variable Interest Entity [Line Items]
Assets	304	279
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	$ 304	$ 279