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Investments - Narrative: Equity Method Investments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Net Investment Income [Line Items]            
Equity Securities, FV-NI, Noncurrent   $ 4,250   $ 4,250   $ 815
Equity Securities, FV-NI, Unrealized Gain (Loss)   (49) $ 17 (41) $ (259)  
Fair Value Measured at Net Asset Value Per Share | Limited Partnership            
Net Investment Income [Line Items]            
Alternative investments   238   238   $ 249
Unfunded additional commitments   138   138    
Net gains (losses) from limited partnership investments   $ 14 (62) $ 5 (282)  
Neumora Therapeutics, Inc.            
Net Investment Income [Line Items]            
Ownership percentage 25.90% 23.20%   23.20%   24.90%
Aggregate cost $ 257          
Cash payment 100 $ 30        
Noncash consideration $ 157          
Equity Securities, FV-NI, Noncurrent   499   $ 499   $ 335
Equity Securities, FV-NI, Unrealized Gain (Loss)   $ 153 $ 240 $ 134 $ 152