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Impact of New Accounting Standard (Market Risk Benefits) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
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, Increase (Decrease) from Equity Market Change $ 10 $ (10) $ 58    
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk 249 247      
Insurance, Other [Member] | 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 249 247 262    
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change 253 263 254    
Market Risk Benefit, Interest Expense 14 54      
Market Risk Benefit, Attributed Fee Collected 25 28      
Market Risk Benefit, Benefit Payment (1) (9)      
Market Risk Benefit, Increase (Decrease) from Future Expected Policyholder Behavior Assumption 16 18      
Market Risk Benefit, Increase (Decrease) from Interest Rate Change (5) (175)      
Market Risk Benefit, Increase (Decrease) from Equity Market Change (52) 48      
Market Risk Benefit, Increase (Decrease) from Volatility (6) 19      
Market Risk Benefit, Increase (Decrease) from Other Assumption (15) 7      
Market Risk Benefit, Increase (Decrease) from Actual Policyholder Behavior Different from Expected 14 19      
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, before Tax (4) (16)      
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk 249 247      
Market Risk Benefit, Reinsurance Recoverable, after Allowance $ 0 $ 0      
Insurance, Other [Member] | Americas [Member] | Accounting Standards Update 2018-12 | 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     262 $ 266 $ 266
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change     254 266 311
Market Risk Benefit, Interest Expense     3    
Market Risk Benefit, Attributed Fee Collected     12    
Market Risk Benefit, Benefit Payment     (14)    
Market Risk Benefit, Increase (Decrease) from Future Expected Policyholder Behavior Assumption     25    
Market Risk Benefit, Increase (Decrease) from Interest Rate Change     (51)    
Market Risk Benefit, Increase (Decrease) from Equity Market Change     (49)    
Market Risk Benefit, Increase (Decrease) from Volatility     (2)    
Market Risk Benefit, Increase (Decrease) from Other Assumption     5    
Market Risk Benefit, Increase (Decrease) from Actual Policyholder Behavior Different from Expected     14    
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, before Tax     8    
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk     262    
Market Risk Benefit, Reinsurance Recoverable, after Allowance     $ 0 $ 0  
Cumulative Effect, Period of Adoption, Adjusted Balance | Insurance, Other [Member] | Americas [Member] | Accounting Standards Update 2018-12 | 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
Cumulative Effect, Period of Adoption, Adjustment | Insurance, Other [Member] | Americas [Member] | Accounting Standards Update 2018-12 | 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