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Investment Information - Limited partnership interests (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]    
Limited partnership interests $ 6,453 $ 6,028
Aggregate commitments 3,700 4,400
Equity method investments    
Schedule of Equity Method Investments [Line Items]    
Limited partnership interests [1] 6,453 5,980
Aggregate commitments 3,600 4,300
Fair value option    
Schedule of Equity Method Investments [Line Items]    
Limited partnership interests [2] 0 48
Aggregate commitments $ 65 $ 21
[1] Aggregate unfunded commitments were $3.6 billion at December 31, 2025, compared to $4.3 billion at December 31, 2024.
[2] Aggregate unfunded commitments were $65 million at December 31, 2025, compared to $21 million at December 31, 2024.