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Variable Interest Entities (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Variable Interest Entity [Line Items]    
Long-term senior note issued in exchange for corporate bond available for sale security $ 275  
Surplus notes 0  
Maximum exposure to loss related to unconsolidated VIE's 0  
Other investments 6,272 $ 4,757
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Other investments $ 5,100 $ 4,000