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Investment Information - Limited partnership interests (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]    
Maximum Exposure to Loss $ 4,200 $ 3,905
Aggregate unfunded commitments 2,800 2,900
Equity method investments    
Schedule of Equity Method Investments [Line Items]    
Maximum Exposure to Loss [1] 4,073 3,774
Aggregate unfunded commitments 2,500 2,600
Fair value option    
Schedule of Equity Method Investments [Line Items]    
Maximum Exposure to Loss [2] 127 131
Aggregate unfunded commitments $ 66 $ 17
[1] Aggregate unfunded commitments were $2.5 billion at June 30, 2023, compared with $2.6 billion at December 31, 2022.
[2] Aggregate unfunded commitments were $66 million at June 30, 2023, compared to $17 million at December 31, 2022.