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Investment Information - Limited partnership interests (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]    
Maximum Exposure to Loss $ 4,951 $ 4,680
Aggregate unfunded commitments 3,700 3,600
Equity method investments    
Schedule of Equity Method Investments [Line Items]    
Maximum Exposure to Loss [1] 4,842 4,566
Aggregate unfunded commitments 3,500 3,400
Fair value option    
Schedule of Equity Method Investments [Line Items]    
Maximum Exposure to Loss [2] 109 114
Aggregate unfunded commitments $ 29 $ 32
[1] Aggregate unfunded commitments were $3.5 billion at March 31, 2024, compared with $3.4 billion at December 31, 2023.
[2] Aggregate unfunded commitments were $29 million at March 31, 2024, compared to $32 million at December 31, 2023