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Acquisitions (Virtus Acquisition Narrative) (Details) - USD ($)
$ in Millions
Jan. 02, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition        
Goodwill   $ 53,268 $ 52,242 $ 13,545
Virtus Partners        
Business Acquisition        
Noncontrolling interest, ownership percentage by noncontrolling owners 30.00%      
Virtus Partners        
Business Acquisition        
Percentage of equity interests acquired (percent) 70.00%      
Cash consideration $ 404      
Fair value of redeemable noncontrolling interest 173      
Goodwill $ 253      
Call option exercise period (in years) 2 years      
Put option exercise period (in years) 3 years      
Virtus Partners | Customer relationships and other        
Business Acquisition        
Intangible assets $ 254      
Virtus Partners | Software        
Business Acquisition        
Intangible assets $ 51