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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Carrying value of investment $ 249   $ 249   $ 215
Gain (loss) on equity securities     (1) $ 9  
Equity investments without readily determinable market value 34   34   42
Private Insurance and Consulting          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Carrying value of investment 59   59   56
Private Equity Investments          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Carrying value of investment 190   190   159
Equity method investment income 3 $ 2 6 $ 19  
Commitments for potential future investments 132   132    
Equity Investments          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Equity securities $ 16   $ 16   17
Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Proceeds from contingent purchase consideration, asset         $ 3
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