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Changes in LFPBs, ASU 2018-12 Transition (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Jan. 01, 2022
Dec. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
Liability for Future Policy Benefit, Activity [Line Items]              
Accumulated other comprehensive income (loss) $ (5,288) $ (6,106) $ (2,541)   $ 47    
Future policy benefits 32,286 31,497     39,990    
Previously Reported              
Liability for Future Policy Benefit, Activity [Line Items]              
Accumulated other comprehensive income (loss)   (5,424)     4,172    
Future policy benefits   41,569     43,807    
Accounting Standards Update 2018-12 | Revision of Prior Period, Accounting Standards Update, Adjustment              
Liability for Future Policy Benefit, Activity [Line Items]              
Accumulated other comprehensive income (loss)   (682)     (4,125)    
Future policy benefits   (10,072)     (3,817)    
Term and Whole Life Insurance              
Liability for Future Policy Benefit, Activity [Line Items]              
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 8,099   8,195        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change   0   $ 157 0 $ 70  
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change 5,359 5,279 5,996   6,426   $ 6,852
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 43 45 61   64    
Future policy benefits $ 2,421 $ 2,363 $ 2,719   $ 3,037    
Term and Whole Life Insurance | Accounting Standards Update 2018-12              
Liability for Future Policy Benefit, Activity [Line Items]              
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance           3,404  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance           85  
Future policy benefits           3,319  
Term and Whole Life Insurance | Accounting Standards Update 2018-12 | Previously Reported              
Liability for Future Policy Benefit, Activity [Line Items]              
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance             2,854
Term and Whole Life Insurance | Accounting Standards Update 2018-12 | Revision of Prior Period, Accounting Standards Update, Adjustment              
Liability for Future Policy Benefit, Activity [Line Items]              
Accumulated other comprehensive income (loss)           0  
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change           14  
Deferred Profit Liabilities           0  
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change           536  
Income Annuity [Domain] | Accounting Standards Update 2018-12              
Liability for Future Policy Benefit, Activity [Line Items]              
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance           4,867  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance           29  
Future policy benefits           4,838  
Income Annuity [Domain] | Accounting Standards Update 2018-12 | Previously Reported              
Liability for Future Policy Benefit, Activity [Line Items]              
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance             4,311
Income Annuity [Domain] | Accounting Standards Update 2018-12 | Revision of Prior Period, Accounting Standards Update, Adjustment              
Liability for Future Policy Benefit, Activity [Line Items]              
Accumulated other comprehensive income (loss)           (203)  
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change           (171)  
Deferred Profit Liabilities           176  
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change           754  
Structured Settlement and Pension Risk Transfer Annuities [Domain] | Accounting Standards Update 2018-12              
Liability for Future Policy Benefit, Activity [Line Items]              
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance           11,518  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance           102  
Future policy benefits           11,416  
Structured Settlement and Pension Risk Transfer Annuities [Domain] | Accounting Standards Update 2018-12 | Previously Reported              
Liability for Future Policy Benefit, Activity [Line Items]              
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance             $ 10,115
Structured Settlement and Pension Risk Transfer Annuities [Domain] | Accounting Standards Update 2018-12 | Revision of Prior Period, Accounting Standards Update, Adjustment              
Liability for Future Policy Benefit, Activity [Line Items]              
Accumulated other comprehensive income (loss)           (1,784)  
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change           200  
Deferred Profit Liabilities           217  
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change           $ 2,770