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FAIR VALUE MEASUREMENTS - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Assets:    
Total $ 2,024  
Fair Value, Measurements, Recurring    
Assets:    
Total 10,005 $ 10,533
Liabilities:    
Total 767 552
Fair Value, Measurements, Recurring | MYR GmbH    
Liabilities:    
Contingent consideration liability 274 206
Fair Value, Measurements, Recurring | Galapagos    
Liabilities:    
Equity securities subject to contractual sale restrictions 570  
Fair Value, Measurements, Recurring | Assembly Biosciences, Inc    
Liabilities:    
Equity securities subject to contractual sale restrictions 115  
Level 1 | Fair Value, Measurements, Recurring    
Assets:    
Total 8,707 10,405
Liabilities:    
Total 401 343
Level 1 | Fair Value, Measurements, Recurring | MYR GmbH    
Liabilities:    
Contingent consideration liability 0 0
Level 2 | Fair Value, Measurements, Recurring    
Assets:    
Total 1,298 128
Liabilities:    
Total 92 3
Level 2 | Fair Value, Measurements, Recurring | MYR GmbH    
Liabilities:    
Contingent consideration liability 0 0
Level 3 | Fair Value, Measurements, Recurring    
Assets:    
Total 0 0
Liabilities:    
Total 274 206
Level 3 | Fair Value, Measurements, Recurring | MYR GmbH    
Liabilities:    
Contingent consideration liability 274 206
U.S. treasury securities | Fair Value, Measurements, Recurring    
Assets:    
Total 757 0
U.S. treasury securities | Level 1 | Fair Value, Measurements, Recurring    
Assets:    
Total 757 0
U.S. treasury securities | Level 2 | Fair Value, Measurements, Recurring    
Assets:    
Total 0 0
U.S. treasury securities | Level 3 | Fair Value, Measurements, Recurring    
Assets:    
Total 0 0
U.S. government agencies securities | Fair Value, Measurements, Recurring    
Assets:    
Total 5 0
U.S. government agencies securities | Level 1 | Fair Value, Measurements, Recurring    
Assets:    
Total 0 0
U.S. government agencies securities | Level 2 | Fair Value, Measurements, Recurring    
Assets:    
Total 5 0
U.S. government agencies securities | Level 3 | Fair Value, Measurements, Recurring    
Assets:    
Total 0 0
Corporate debt securities | Fair Value, Measurements, Recurring    
Assets:    
Total 963 0
Corporate debt securities | Level 1 | Fair Value, Measurements, Recurring    
Assets:    
Total 0 0
Corporate debt securities | Level 2 | Fair Value, Measurements, Recurring    
Assets:    
Total 963 0
Corporate debt securities | Level 3 | Fair Value, Measurements, Recurring    
Assets:    
Total 0 0
Residential mortgage and asset-backed securities | Fair Value, Measurements, Recurring    
Assets:    
Total 300 0
Residential mortgage and asset-backed securities | Level 1 | Fair Value, Measurements, Recurring    
Assets:    
Total 0 0
Residential mortgage and asset-backed securities | Level 2 | Fair Value, Measurements, Recurring    
Assets:    
Total 300 0
Residential mortgage and asset-backed securities | Level 3 | Fair Value, Measurements, Recurring    
Assets:    
Total 0 0
Money market funds | Fair Value, Measurements, Recurring    
Assets:    
Equity securities 5,745 8,502
Money market funds | Level 1 | Fair Value, Measurements, Recurring    
Assets:    
Equity securities 5,745 8,502
Money market funds | Level 2 | Fair Value, Measurements, Recurring    
Assets:    
Equity securities 0 0
Money market funds | Level 3 | Fair Value, Measurements, Recurring    
Assets:    
Equity securities 0 0
Publicly traded equity securities | Fair Value, Measurements, Recurring    
Assets:    
Equity securities 1,804 1,561
Publicly traded equity securities | Level 1 | Fair Value, Measurements, Recurring    
Assets:    
Equity securities 1,804 1,561
Publicly traded equity securities | Level 2 | Fair Value, Measurements, Recurring    
Assets:    
Equity securities 0 0
Publicly traded equity securities | Level 3 | Fair Value, Measurements, Recurring    
Assets:    
Equity securities 0 0
Deferred compensation plan | Fair Value, Measurements, Recurring    
Assets:    
Equity securities 401 343
Liabilities:    
Deferred compensation plan 401 343
Deferred compensation plan | Level 1 | Fair Value, Measurements, Recurring    
Assets:    
Equity securities 401 343
Liabilities:    
Deferred compensation plan 401 343
Deferred compensation plan | Level 2 | Fair Value, Measurements, Recurring    
Assets:    
Equity securities 0 0
Liabilities:    
Deferred compensation plan 0 0
Deferred compensation plan | Level 3 | Fair Value, Measurements, Recurring    
Assets:    
Equity securities 0 0
Liabilities:    
Deferred compensation plan 0 0
Foreign currency derivative contracts | Fair Value, Measurements, Recurring    
Assets:    
Foreign currency derivative contracts 31 128
Liabilities:    
Foreign currency derivative contracts 92 3
Foreign currency derivative contracts | Level 1 | Fair Value, Measurements, Recurring    
Assets:    
Foreign currency derivative contracts 0 0
Liabilities:    
Foreign currency derivative contracts 0 0
Foreign currency derivative contracts | Level 2 | Fair Value, Measurements, Recurring    
Assets:    
Foreign currency derivative contracts 31 128
Liabilities:    
Foreign currency derivative contracts 92 3
Foreign currency derivative contracts | Level 3 | Fair Value, Measurements, Recurring    
Assets:    
Foreign currency derivative contracts 0 0
Liabilities:    
Foreign currency derivative contracts $ 0 $ 0