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Impact of New Accounting Standard (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Future policy benefits $ 41,231 $ 35,689    
Deferred policy acquisition costs 4,617 4,128    
Market Risk Benefit, Net Amount at Risk $ 258 247    
Accounting Standards Update 2018-12        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Future policy benefits   35,689 $ 47,449  
Deferred policy acquisition costs   4,128 3,860  
Market Risk Benefit, Net Amount at Risk   247 262  
Revision of Prior Period, Change in Accounting Principle, Adjustment | Accounting Standards Update 2018-12        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Future policy benefits   469 11,667  
Deferred policy acquisition costs   154 170  
Market Risk Benefit, Net Amount at Risk   $ 247 $ 262  
Revision of Prior Period, Accounting Standards Update, Adjustment | Accounting Standards Update 2018-12 | Retained Earnings Member        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Future policy benefits       $ (1,746)
Deferred policy acquisition costs       0
Market Risk Benefit, Net Amount at Risk       (72)
Revision of Prior Period, Accounting Standards Update, Adjustment | Accounting Standards Update 2018-12 | Accumulated Other Comprehensive Income Member        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Future policy benefits       (8,593)
Deferred policy acquisition costs       114
Market Risk Benefit, Net Amount at Risk       45
Life Insurance Product Line [Member] | Revision of Prior Period, Change in Accounting Principle, Adjustment | Accounting Standards Update 2018-12 | Other Segments | Retained Earnings Member        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Future policy benefits       1,462
Insurance, Other [Member] | Revision of Prior Period, Change in Accounting Principle, Adjustment | Accounting Standards Update 2018-12 | Other Segments | Retained Earnings Member        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Future policy benefits       $ 284