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Future Policy Benefits -Summary Balances and Changes in the Present Value of Expected Net Premiums and Present Value (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Future policy benefits $ 5,371 $ 5,021 $ 4,918  
Less: Reinsurance recoverable       $ 1,115
Traditional Life        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Balance, beginning of year 797 1,020 1,152  
Beginning balance of original discount rate 974 1,045 1,131  
Effect of actual variances from expected experience   3 33 25
Balance adjusted for variances from expectation   977 1,078 1,156
Interest accrual 5 20 22  
Benefits payments 30 124 133  
Ending Balance at original discount rate 952 974 1,045  
Effect of changes in discount rate assumptions 158 177 25  
Balance, end of year 794 797 1,020  
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Balance, beginning of year 2,151 2,772 3,105  
Beginning balance of original discount rate 2,665 2,806 2,995  
Effect of actual variances from expected experience   (7) 13 (14)
Balance adjusted for variances from expectation   2,658 2,819 2,981
Interest accrual 14 59 62  
Benefits payments (48) (213) (237)  
Ending Balance at original discount rate 2,624 2,665 2,806  
Effect of changes in discount rate assumptions 448 514 34  
Balance, end of year 2,176 2,151 2,772  
Future policy benefits 1,382 1,354 1,752  
Less: Reinsurance recoverable 510 515 670 793
Liability for Future Policy Benefit, after Reinsurance, Total $ 872 $ 839 $ 1,082  
Weighted-average duration of liability for future policyholder benefits (years) 7 years 6 months 10 days 7 years 6 months 29 days 8 years 6 months 14 days  
Immediate Annuities        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Balance, beginning of year   $ 1,954 $ 2,153  
Beginning balance of original discount rate   1,935 2,040  
Effect of actual variances from expected experience       (47)
Balance adjusted for variances from expectation       1,993
Issuances     18  
Interest accrual     60  
Benefits payments     (136)  
Ending Balance at original discount rate     1,935  
Balance, end of year     1,954  
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Balance, beginning of year $ 1,429 1,954    
Beginning balance of original discount rate 1,858 1,935    
Effect of changes in cash flow assumptions   0 0  
Effect of actual variances from expected experience   (7) (26)  
Balance adjusted for variances from expectation   1,851 1,909  
Issuances 5 26    
Interest accrual 16 60    
Benefits payments (31) (137)    
Ending Balance at original discount rate 1,841 1,858 1,935  
Effect of changes in discount rate assumptions (389) 429 (19)  
Balance, end of year 1,452 1,429 1,954  
Future policy benefits 1,452 1,429 1,954  
Less: Reinsurance recoverable 204 218 293 322
Liability for Future Policy Benefit, after Reinsurance, Total $ 1,248 $ 1,211 $ 1,661  
Weighted-average duration of liability for future policyholder benefits (years) 12 years 2 months 4 days 11 years 9 months 3 days 13 years 7 months 9 days  
PRT        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Balance, beginning of year   $ 1,148 $ 0  
Beginning balance of original discount rate   1,151 0  
Effect of actual variances from expected experience       0
Balance adjusted for variances from expectation       $ 0
Issuances     1,155  
Interest accrual     2  
Benefits payments     (6)  
Ending Balance at original discount rate     1,151  
Balance, end of year     1,148  
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Balance, beginning of year $ 2,165 1,148    
Beginning balance of original discount rate 2,475 1,151    
Effect of changes in cash flow assumptions   (1) (20)  
Effect of actual variances from expected experience   (3) 2  
Balance adjusted for variances from expectation   2,471 1,133  
Issuances 268 1,418    
Interest accrual 23 50    
Benefits payments (55) (126)    
Ending Balance at original discount rate 2,707 2,475 1,151  
Effect of changes in discount rate assumptions (251) 310 3  
Balance, end of year 2,456 2,165 1,148  
Future policy benefits 2,456 2,165 1,148  
Less: Reinsurance recoverable 0 0 0  
Liability for Future Policy Benefit, after Reinsurance, Total $ 2,456 $ 2,165 $ 1,148  
Weighted-average duration of liability for future policyholder benefits (years) 8 years 25 days 8 years 1 month 2 days 8 years 9 months