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Contingencies, Commitments and Guarantees (Contingencies, Commitments and Guarantees - Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Settlement for reinsurance-related matter   $ 269 $ 359 $ 223
Cumulative maximum indemnities and guarantees contractual limitation   98    
Liabilities for indemnities, guarantees and commitments   1 1  
Non-litigation loss        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Settlement for reinsurance-related matter $ 140      
Minimum        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Indemnities and guarantees contractual limitation range   6    
Minimum | Non-litigation loss        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Loss contingency, range of possible loss, portion not accrued   0    
Maximum        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Loss contingency, range of possible loss, portion not accrued   10    
Indemnities and guarantees contractual limitation range   92    
Maximum | Non-litigation loss        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Loss contingency, range of possible loss, portion not accrued   125    
Mortgage Loan Commitments        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Fair value disclosure, off-balance sheet risks, face amount, liability   374 247  
Commitments to Fund Partnership Investments and Private Corporate Bond Investments        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Fair value disclosure, off-balance sheet risks, face amount, liability   $ 1,400 $ 1,900