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Business and Basis of Presentation (Transition of Adjustment Rollforward of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Jan. 01, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Beginning balance [1]   $ (3,806)    
Ending balance   (6,504) [2] $ (3,806) [1]  
Accumulated Other Comprehensive Income (Loss)        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Beginning balance $ 30,738 (3,806) (9,493) $ 30,738
Ending balance (11,658) (6,504) (3,806) (9,493)
As Previously Reported        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Beginning balance   (19,827)    
Ending balance     (19,827)  
As Previously Reported | Accumulated Other Comprehensive Income (Loss)        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Beginning balance 30,738     $ 30,738
Effect of Change        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Beginning balance   $ 16,021    
Ending balance     $ 16,021  
Effect of Change | Accumulated Other Comprehensive Income (Loss)        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Unwinding amounts related to unrealized investment gains and losses 5,534      
Reclassification of MRB NPR to AOCI 1,588      
Interest rate remeasurement of future policy benefits (62,711)      
Change in operating joint ventures (12)      
Total Pre-Tax Adjustments (55,601)      
Tax impacts $ 13,205      
[1] Prior period amounts adjusted for the implementation of ASU 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.
[2] See Note 24 for additional information regarding related party transactions.