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Derivative Instruments - Notional Amounts and Fair Value of Derivatives (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Notional Amount $ 48,337 $ 4,084
Derivative asset, subject to master netting arrangement, after offset 1,341 227
Derivative liability, subject to master netting arrangement, after offset 0 0
Derivative assets 1,346 227
Derivative liabilities 1,165 $ 873
Derivative Liability, Statement of Financial Position [Extensible Enumeration]   Other liabilities
Foreign exchange forwards    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative asset, subject to master netting arrangement, after offset 43 $ 0
Derivative liability, subject to master netting arrangement, after offset 0 0
Equity-indexed options    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative asset, subject to master netting arrangement, after offset 1,298 227
Derivative liability, subject to master netting arrangement, after offset 0 0
Indexed annuity and variable annuity product    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Notional Amount 0 0
Derivative asset, subject to master netting arrangement, after offset 0 0
Derivative liability, subject to master netting arrangement, after offset 1,123 873
Funds withheld and Modco arrangements    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Notional Amount 0 0
Derivative asset, subject to master netting arrangement, after offset 0 0
Derivative liability, subject to master netting arrangement, after offset 37 0
Designated as Hedging Instrument | Foreign exchange forwards    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Notional Amount 897 0
Derivative asset, subject to master netting arrangement, after offset 20 0
Derivative liability, subject to master netting arrangement, after offset 0 0
Not Designated as Hedging Instrument | Foreign exchange forwards    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Notional Amount 1,066 0
Derivative asset, subject to master netting arrangement, after offset 23 0
Derivative liability, subject to master netting arrangement, after offset 0 0
Not Designated as Hedging Instrument | Equity-indexed options    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Notional Amount 46,374 4,084
Derivative asset, subject to master netting arrangement, after offset 1,303 227
Derivative liability, subject to master netting arrangement, after offset $ 5 $ 0