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Insurance (Future Policy Benefits Information by Product) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 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 $ 32,286 $ 36,373          
Future policy benefits 32,286   $ 31,497 $ 39,990      
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 2,895 3,216 2,871 3,325     $ 3,448
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance 3,165 3,190 3,212 3,051     2,994
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Model Refinements     0 122 $ 122 $ 0  
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     0 (1) 137 70  
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (9) 77 119 153  
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change     3,203 3,249 3,429 3,217  
Liability for Future Policy Benefit, Expected Net Premium, Issuance 24 20 93 113      
Liability for Future Policy Benefit, Expected Net Premium, Interest Income 28 28 116 111      
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected (90) (107) (426) (390)      
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax (270) 26 (341) 274      
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change 5,359 5,996 5,279 6,426     6,852
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance 5,860 5,910 5,922 5,820     5,862
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Model Refinements 0 135 135 0      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     0 0 157 70  
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (9) 85 155 153  
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     5,913 6,040 6,267 6,085  
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance 24 22 101 128      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 54 56 222 222      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (131) (208) (668) (615)      
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (501) 86 (643) 606      
Liability for Future Policy Benefit, before Reinsurance 2,464 2,780 2,408 3,101      
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 43 61 45 64      
Future policy benefits $ 2,421 $ 2,719 2,363 3,037      
Liability for Future Policy Benefit, Weighted-Average Duration 8 years 4 months 24 days 8 years 4 months 24 days          
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 3.96% 3.98%          
Liability for Future Policy Benefit, Gross Premium Income $ 153 $ 171          
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 6,618 6,954          
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance 4,905 5,138          
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 8,099 8,195          
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 3,604 3,953 3,512 4,333     4,691
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance 3,891 3,843 3,897 3,865     3,938
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 56 (41)  
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (31) (9) (22) (6)  
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     3,866 3,856 3,899 3,891  
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance 78 43 224 198      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 36 37 146 150      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (89) (93) (372) (374)      
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (287) 110 (385) 468      
Liability for Future Policy Benefit, before Reinsurance 3,604 3,953 3,512 4,333      
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 26 25 24 27      
Future policy benefits $ 3,578 $ 3,928 3,488 4,306      
Liability for Future Policy Benefit, Weighted-Average Duration 8 years 4 months 24 days 8 years 6 months          
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 3.87% 3.95%          
Liability for Future Policy Benefit, Gross Premium Income $ 102 $ 45          
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 5,375 5,479          
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 6,928 8,889 6,793 10,171     11,301
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance 7,313 8,069 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     (31) (22) (23) (16)  
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     7,379 8,143 $ 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 80 87 327 359      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (146) (161) (624) (668)      
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (385) 820 (617) 2,006      
Liability for Future Policy Benefit, before Reinsurance 6,928 8,889 6,793 10,171      
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 69 82 68 93      
Future policy benefits $ 6,859 $ 8,807 $ 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 4.46% 4.45%          
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 $ 14,224 $ 17,046