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Financial Instruments, Derivatives and Fair Value Measures - Bases of Measurement (Details) - Recurring - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Fair value, asset and liability measures    
Equity securities $ 403 $ 386
Interest rate swap derivative financial instruments 143 210
Foreign currency forward exchange contracts 141 90
Total Assets 687 686
Fair value of hedged long-term debt 2,982 3,049
Foreign currency forward exchange contracts 218 498
Contingent consideration related to business combinations 67 68
Total Liabilities 3,267 3,615
Quoted Prices in Active Markets    
Fair value, asset and liability measures    
Equity securities 403 386
Total Assets 403 386
Significant Other Observable Inputs    
Fair value, asset and liability measures    
Interest rate swap derivative financial instruments 143 210
Foreign currency forward exchange contracts 141 90
Total Assets 284 300
Fair value of hedged long-term debt 2,982 3,049
Foreign currency forward exchange contracts 218 498
Total Liabilities 3,200 3,547
Significant Unobservable Inputs    
Fair value, asset and liability measures    
Contingent consideration related to business combinations 67 68
Total Liabilities $ 67 $ 68