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Insurance (Future Policy Benefits Information by Product) (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2022
Jan. 01, 2021
Dec. 31, 2020
Liability for Future Policy Benefit, by Product Segment [Line Items]              
Liability for Future Policy Benefit, before Reinsurance $ 29,924 $ 31,580          
Future policy benefits 29,924   $ 31,146 $ 39,830      
Term and Whole Life Insurance              
Liability for Future Policy Benefit, by Product Segment [Line Items]              
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change 2,764 2,799 2,804 3,212     $ 3,274
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance 3,192 3,171 3,146 2,964     2,868
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Model Refinements     0 121 $ 121 $ 0  
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     206 160 159 100  
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (36) 88 114 158  
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change     3,316 3,333 3,358 3,126  
Liability for Future Policy Benefit, Expected Net Premium, Issuance 71 71 93 112      
Liability for Future Policy Benefit, Expected Net Premium, Interest Income 80 85 112 107      
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected (275) (318) (417) (381)      
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax (428) (372) (342) 248      
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change 5,071 5,145 5,172 6,253     6,606
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance 5,935 5,857 5,816 5,682     5,678
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Model Refinements 0 134 134 0      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     296 181 179 100  
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (39) 117 150 158  
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     6,073 6,114 6,145 5,936  
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance 74 78 101 128      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 157 163 216 214      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (369) (498) (646) (596)      
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (864) (712) (644) 571      
Liability for Future Policy Benefit, before Reinsurance 2,307 2,346 2,368 3,041      
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 26 33 32 42      
Future policy benefits $ 2,281 $ 2,313 2,336 2,999      
Liability for Future Policy Benefit, Weighted-Average Duration 8 years 10 months 24 days 8 years 7 months 6 days          
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 3.92% 3.95%          
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.87% 5.46%          
Liability for Future Policy Benefit, Gross Premium Income $ 439 $ 473          
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 6,079 6,641          
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance 4,598 4,948          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 8,194 8,093          
Income Annuities              
Liability for Future Policy Benefit, by Product Segment [Line Items]              
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change 0 0 0 0     0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance 0 0 0 0     0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Model Refinements     0 0 0 0  
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     0 0 0 0  
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     0 0 0 0  
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change     0 0 0 0  
Liability for Future Policy Benefit, Expected Net Premium, Issuance 0 0 0 0      
Liability for Future Policy Benefit, Expected Net Premium, Interest Income 0 0 0 0      
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected 0 0 0 0      
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax 0 0 0 0      
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change 3,449 3,393 3,469 4,283     4,636
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance 3,957 3,803 3,848 3,817     3,889
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Model Refinements 0 0 0 0      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     0 0 55 (40)  
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     18 (23) (21) (6)  
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     3,866 3,794 3,851 3,843  
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance 277 165 220 193      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 106 107 144 149      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (292) (263) (367) (368)      
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (508) (410) (379) 466      
Liability for Future Policy Benefit, before Reinsurance 3,449 3,393 3,469 4,283      
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 30 24 25 28      
Future policy benefits $ 3,419 $ 3,369 3,444 4,255      
Liability for Future Policy Benefit, Weighted-Average Duration 8 years 3 months 18 days 8 years 4 months 24 days          
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 3.96% 3.91%          
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.87% 5.45%          
Liability for Future Policy Benefit, Gross Premium Income $ 339 $ 186          
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 0 0          
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance 0 0          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 5,570 5,365          
Structured Settlement and Pension Risk Transfer Annuities              
Liability for Future Policy Benefit, by Product Segment [Line Items]              
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change 0 0 0 0     0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance 0 0 0 0     0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Model Refinements     0 0 0 0  
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     0 0 0 0  
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     0 0 0 0  
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change     0 0 0 0  
Liability for Future Policy Benefit, Expected Net Premium, Issuance 0 0 0 0      
Liability for Future Policy Benefit, Expected Net Premium, Interest Income 0 0 0 0      
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected 0 0 0 0      
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax 0 0 0 0      
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change 6,192 7,049 6,793 10,171     11,301
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance 7,148 7,908 7,410 8,165     $ 8,531
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Model Refinements 0 0 (278) 0      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     0 0 (157) (41)  
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (49) (39) (23) (16)  
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     7,361 8,126 $ 7,707 $ 8,474  
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance 0 0 0 0      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 236 259 327 359      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (449) (477) (624) (668)      
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (956) (859) (617) 2,006      
Liability for Future Policy Benefit, before Reinsurance 6,192 7,049 6,793 10,171      
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 0 69 68 93      
Future policy benefits $ 6,192 $ 6,980 $ 6,725 $ 10,078      
Liability for Future Policy Benefit, Weighted-Average Duration 11 years 7 months 6 days 12 years 8 months 12 days          
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 4.45% 4.44%          
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.91% 5.46%          
Liability for Future Policy Benefit, Gross Premium Income $ 0 $ 0          
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 0 0          
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance 0 0          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance $ 13,909 $ 16,721