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Investment Information - Limited partnership interests (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]    
Maximum Exposure to Loss $ 4,026 $ 3,905
Aggregate unfunded commitments 2,900 2,900
Equity method investments    
Schedule of Equity Method Investments [Line Items]    
Maximum Exposure to Loss [1] 3,896 3,774
Aggregate unfunded commitments 2,600 2,600
Fair value option    
Schedule of Equity Method Investments [Line Items]    
Maximum Exposure to Loss [2] 130 131
Aggregate unfunded commitments $ 61 $ 17
[1] Aggregate unfunded commitments were $2.6 billion at March 31, 2023, compared with $2.6 billion at December 31, 2022.
[2] Aggregate unfunded commitments were $61 million at March 31, 2023, compared to $17 million at December 31, 2022.