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Investment Information - Limited partnership interests (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]    
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount $ 4,680 $ 3,904
Aggregate commitments 3,600 2,900
Equity method investments    
Schedule of Equity Method Investments [Line Items]    
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount [1] 4,566 3,774
Aggregate commitments 3,400 2,600
Fair value option    
Schedule of Equity Method Investments [Line Items]    
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount [2] 114 130
Aggregate commitments $ 32 $ 17
[1] Aggregate unfunded commitments were $3.4 billion at December 31, 2023, consistent with $2.6 billion at December 31, 2022.
[2] Aggregate unfunded commitments were $32 million at December 31, 2023, compared to $17 million at December 31, 2022.