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Insurance (Market Risk Benefit) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
Variable Annuities            
Market Risk Benefit [Line Items]            
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk $ 10,286 $ 13,342 $ 9,974 $ 15,698   $ 18,388
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change 8,534 10,183 8,230 11,611   $ 14,934
Market Risk Benefit, Decrement (28) 34 16 (68)    
Market Risk Benefit, Increase (Decrease) from Future Expected Policyholder Behavior Assumption 0 0 210 41    
Market Risk Benefit, Increase (Decrease) from Actual Policyholder Behavior Different from Expected 122 0 (48) (86)    
Market Risk Benefit, Increase (Decrease) from Interest Rate Change 880 (2,860) (8,394) (1,829)    
Market Risk Benefit, Increase (Decrease) from Equity Market Change (1,002) 1,183 3,807 (2,578)    
Market Risk Benefit, Issuance (3) (11) (47) (96)    
Market Risk Benefit, Effect of changes in risk margin 9 (50) (152) (128)    
Market Risk Benefit, Aging of the Block and Other 326 276 1,227 1,421    
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, before Tax 1,752 3,159 1,744 4,087    
Market Risk Benefit, Reinsurance Recoverable, after Allowance 71 93 71 118 $ 169  
Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change $ 10,215 $ 13,249 $ 9,903 $ 15,580 $ 18,219  
Market Risk Benefit, Weighted-Average Attained Age of Contract holder 72 years 1 month 6 days 71 years 6 months 71 years 9 months 18 days 71 years 1 month 6 days    
Index-linked Annuities            
Market Risk Benefit [Line Items]            
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk $ 4 $ 4 $ 3 $ 5