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Accounting Changes and Error Corrections (Market Risk Benefits) (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk $ 216 $ 259        
Insurance, Other | Americas [Member] | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Market Risk Benefit, Attributed Fee Collected 19 7        
Market Risk Benefit, Benefit Payment 1 1        
Market Risk Benefit, Increase (Decrease) from Future Expected Policyholder Behavior Assumption 16 19        
Market Risk Benefit, Increase (Decrease) from Interest Rate Change (54) (40)        
Market Risk Benefit, Increase (Decrease) from Equity Market Change (25) 17        
Market Risk Benefit, Increase (Decrease) from Volatility (5) 4        
Market Risk Benefit, Increase (Decrease) from Other Assumption (11) 1        
Market Risk Benefit, Increase (Decrease) from Actual Policyholder Behavior Different from Expected 12 (1)        
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk 216 259        
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, before Tax (9) (24)        
Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change 216 259 $ 247 $ 262    
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change 225 283 263 254    
Market Risk Benefit, Interest Expense 9 21        
Market Risk Benefit, Reinsurance Recoverable, after Allowance $ 0 $ 0        
Accounting Standards Update 2018-12 | Insurance, Other | Americas [Member] | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Market Risk Benefit, Attributed Fee Collected     28 12    
Market Risk Benefit, Benefit Payment     (9) (14)    
Market Risk Benefit, Increase (Decrease) from Future Expected Policyholder Behavior Assumption     18 25    
Market Risk Benefit, Increase (Decrease) from Interest Rate Change     (175) (51)    
Market Risk Benefit, Increase (Decrease) from Equity Market Change     48 (49)    
Market Risk Benefit, Increase (Decrease) from Volatility     19 (2)    
Market Risk Benefit, Increase (Decrease) from Other Assumption     7 5    
Market Risk Benefit, Increase (Decrease) from Actual Policyholder Behavior Different from Expected     19 14    
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk     247 262    
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, before Tax     (16) 8    
Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change     247 262 $ 266 $ 266
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change     263 254 266 311
Market Risk Benefit, Interest Expense     54 3    
Market Risk Benefit, Reinsurance Recoverable, after Allowance     $ 0 $ 0 $ 0  
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance | Insurance, Other | Americas [Member] | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change           0
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment | Insurance, Other | Americas [Member] | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change           $ 266