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Investments and Fair Value Measurements - Fair Value Hierarchy of Assets and Liabilities (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Assets:    
Money market funds (cash equivalents) $ 869 $ 774
Marketable equity securities 7 6
Helix contingent value right 71 68
Deferred compensation plan assets 66 61
Total assets measured at fair value 1,013 909
Liabilities:    
Contingent consideration liabilities 403 387
Deferred compensation plan liability 63 59
Total liabilities measured at fair value 466 446
Level 1    
Assets:    
Money market funds (cash equivalents) 869 774
Marketable equity securities 7 6
Helix contingent value right 0 0
Deferred compensation plan assets 0 0
Total assets measured at fair value 876 780
Liabilities:    
Contingent consideration liabilities 0 0
Deferred compensation plan liability 0 0
Total liabilities measured at fair value 0 0
Level 2    
Assets:    
Money market funds (cash equivalents) 0 0
Marketable equity securities 0 0
Helix contingent value right 0 0
Deferred compensation plan assets 66 61
Total assets measured at fair value 66 61
Liabilities:    
Contingent consideration liabilities 0 0
Deferred compensation plan liability 63 59
Total liabilities measured at fair value 63 59
Level 3    
Assets:    
Money market funds (cash equivalents) 0 0
Marketable equity securities 0 0
Helix contingent value right 71 68
Deferred compensation plan assets 0 0
Total assets measured at fair value 71 68
Liabilities:    
Contingent consideration liabilities 403 387
Deferred compensation plan liability 0 0
Total liabilities measured at fair value $ 403 $ 387