Variable Interest Entities - Nonconsolidated VIEs (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Variable Interest Entity [Line Items]
Fair Value	$ 3,311	$ 3,299
Unfunded Commitments	842	903
Maximum Exposure to Loss	4,153	4,202
Equity investments
Variable Interest Entity [Line Items]
Fair Value	113	120
Unfunded Commitments	9	0
Maximum Exposure to Loss	122	120
Other investments
Variable Interest Entity [Line Items]
Fair Value	3,198	3,179
Unfunded Commitments	833	903
Maximum Exposure to Loss	4,031	4,082
Hedge funds
Variable Interest Entity [Line Items]
Fair Value	386	410
Unfunded Commitments	0	0
Maximum Exposure to Loss	386	410
Fixed income funds
Variable Interest Entity [Line Items]
Fair Value	370	365
Unfunded Commitments	34	34
Maximum Exposure to Loss	404	399
Private equity funds
Variable Interest Entity [Line Items]
Fair Value	1,450	1,442
Unfunded Commitments	463	501
Maximum Exposure to Loss	1,913	1,943
CLO equity funds
Variable Interest Entity [Line Items]
Fair Value	124	162
Unfunded Commitments	0	0
Maximum Exposure to Loss	124	162
Private credit funds
Variable Interest Entity [Line Items]
Fair Value	696	638
Unfunded Commitments	206	231
Maximum Exposure to Loss	902	869
Real estate funds
Variable Interest Entity [Line Items]
Fair Value	172	162
Unfunded Commitments	130	137
Maximum Exposure to Loss	302	299
Publicly traded \| Equity investments
Variable Interest Entity [Line Items]
Fair Value	56	59
Unfunded Commitments	0	0
Maximum Exposure to Loss	56	59
Privately held \| Equity investments
Variable Interest Entity [Line Items]
Fair Value	57	61
Unfunded Commitments	9	0
Maximum Exposure to Loss	$ 66	$ 61