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Derivative Financial Instruments - Carrying Amounts of Derivative Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Carrying Amount    
Derivative [Line Items]    
Derivative asset, carrying amount $ 936 $ 977
Derivatives liabilities, carrying amount 5,231 4,259
Equity options | Derivative Investments    
Derivative [Line Items]    
Derivative asset, notional amount 29,594 27,263
Equity options | Derivative Investments | Carrying Amount    
Derivative [Line Items]    
Derivative asset, carrying amount 773 739
Equity options | Accounts payable and accrued liabilities: | Carrying Amount    
Derivative [Line Items]    
Derivatives liabilities, carrying amount 1 1
Interest rate swaps | Derivative Investments    
Derivative [Line Items]    
Derivative asset, notional amount 2,445 2,705
Interest rate swaps | Derivative Investments | Carrying Amount    
Derivative [Line Items]    
Derivative asset, carrying amount 19 57
Interest rate swaps | Accounts payable and accrued liabilities:    
Derivative [Line Items]    
Derivative liability, notional amount 2,700  
Interest rate swaps | Accounts payable and accrued liabilities: | Carrying Amount    
Derivative [Line Items]    
Derivatives liabilities, carrying amount 10 0
Other derivative investments | Derivative Investments    
Derivative [Line Items]    
Derivative asset, notional amount 157 137
Other derivative investments | Derivative Investments | Carrying Amount    
Derivative [Line Items]    
Derivative asset, carrying amount 3 1
Other embedded derivatives | Other long-term investments | Carrying Amount    
Derivative [Line Items]    
Derivative asset, carrying amount 32 28
Reinsurance related embedded derivatives | Prepaid expenses and other assets: | Carrying Amount    
Derivative [Line Items]    
Derivative asset, carrying amount 109 152
Indexed annuities/IUL embedded derivatives | Contractholder funds: | Carrying Amount    
Derivative [Line Items]    
Derivatives liabilities, carrying amount $ 5,220 $ 4,258