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Contingencies, Commitments and Guarantees (Contingencies, Commitments and Guarantees - Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]            
Settlement for reinsurance-related matter $ 64 $ 70   $ 187 $ 332  
Cumulative maximum indemnities and guarantees contractual limitation 98     98    
Liabilities for indemnities, guarantees and commitments 1     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     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     0    
Maximum            
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]            
Loss contingency, range of possible loss, portion not accrued 10     10    
Indemnities and guarantees contractual limitation range 92     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     125    
Mortgage Loan Commitments            
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]            
Fair value disclosure, off-balance sheet risks, face amount, liability 294     294   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     $ 1,400   $ 1,900