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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Carrying value of investment $ 295 $ 295   $ 257
Exchange traded equity securities 23 23   19
Mark-to-market gains on other investments   2    
Equity investments without readily determinable market value 16 16   16
Private Equity Investments        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Carrying value of investment 215 215   182
Equity method investment income 15 25    
Commitments for potential future investments 101 101    
Private Insurance and Consulting        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Carrying value of investment $ 80 $ 80   $ 75
Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Revenue target period (in years)   2 years 2 years  
Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Revenue target period (in years)   4 years 4 years