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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Carrying value of investment $ 275   $ 266
Equity securities 19   16
Equity investments without readily determinable market value 21   20
Private Insurance and Consulting      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Carrying value of investment 74   63
Private Equity Investments      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Carrying value of investment 201   203
Commitments for potential future investments 120    
Fair Value, Measurements, Recurring      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Equity securities 8   5
Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Proceeds from contingent purchase consideration, asset 1    
Equity securities $ 0   $ 0
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