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Acquisition (Details)
$ in Millions
1 Months Ended 12 Months Ended
Jan. 02, 2020
Jan. 31, 2023
USD ($)
Dec. 31, 2024
USD ($)
business
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Business Acquisition          
Number of businesses acquired | business     3    
Purchase of noncontrolling interest     $ 0 $ 173 $ 0
2024 Business Combinations          
Business Acquisition          
Total cash consideration, net of cash acquired     514    
Business combination, recognized identifiable assets acquired and liabilities assumed, goodwill     351    
Business combination, recognized Identifiable assets acquired and liabilities assumed, equipment     153    
2024 Business Combinations | Customer relationships          
Business Acquisition          
Business combination, recognized identifiable assets acquired and liabilities assumed, goodwill     $ 83    
Virtus Acquisition          
Business Acquisition          
Percentage of equity interests acquired 70.00%        
Call option exercise period 2 years        
Put option exercise period 3 years        
Virtus Acquisition | Virtus Partners          
Business Acquisition          
Percentage of equity interests acquired   100.00%      
Noncontrolling interest, ownership percentage by noncontrolling owners 30.00%        
Purchase of noncontrolling interest   $ 173