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Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Assets        
Investments $ 88 $ 89    
Publicly traded equity securities 1,579 1,787    
Derivative assets 333 182    
Liabilities        
Contingent consideration 879 841 $ 798 $ 767
Derivative liabilities 174 525    
Foreign government bonds        
Assets        
Investments 2 5    
Corporate notes and bonds        
Assets        
Investments 4 0    
U.S. government and agency securities        
Assets        
Investments 82 84    
Fair Value, Measurements, Recurring        
Assets        
Investments 411 785    
Other assets 1,256 1,091    
Derivative assets 333 182    
Total assets 2,000 2,058    
Liabilities        
Contingent consideration 879 841    
Derivative liabilities 174 525    
Total liabilities 1,053 1,366    
Fair Value, Measurements, Recurring | Foreign exchange contracts        
Assets        
Derivative assets 203 90    
Liabilities        
Derivative liabilities 173 505    
Fair Value, Measurements, Recurring | Interest rate swap contracts        
Assets        
Derivative assets 36 55    
Fair Value, Measurements, Recurring | Currency options        
Assets        
Derivative assets 94 37    
Liabilities        
Derivative liabilities 1 20    
Fair Value, Measurements, Recurring | Level 1        
Assets        
Investments 409 780    
Other assets 1,256 1,091    
Derivative assets 0 0    
Total assets 1,665 1,871    
Liabilities        
Contingent consideration 0 0    
Derivative liabilities 0 0    
Total liabilities 0 0    
Fair Value, Measurements, Recurring | Level 1 | Foreign exchange contracts        
Assets        
Derivative assets 0 0    
Liabilities        
Derivative liabilities 0 0    
Fair Value, Measurements, Recurring | Level 1 | Interest rate swap contracts        
Assets        
Derivative assets 0 0    
Fair Value, Measurements, Recurring | Level 1 | Currency options        
Assets        
Derivative assets 0 0    
Liabilities        
Derivative liabilities 0 0    
Fair Value, Measurements, Recurring | Level 2        
Assets        
Investments 2 5    
Other assets 0 0    
Derivative assets 333 182    
Total assets 335 187    
Liabilities        
Contingent consideration 0 0    
Derivative liabilities 174 525    
Total liabilities 174 525    
Fair Value, Measurements, Recurring | Level 2 | Foreign exchange contracts        
Assets        
Derivative assets 203 90    
Liabilities        
Derivative liabilities 173 505    
Fair Value, Measurements, Recurring | Level 2 | Interest rate swap contracts        
Assets        
Derivative assets 36 55    
Fair Value, Measurements, Recurring | Level 2 | Currency options        
Assets        
Derivative assets 94 37    
Liabilities        
Derivative liabilities 1 20    
Fair Value, Measurements, Recurring | Level 3        
Assets        
Investments 0 0    
Other assets 0 0    
Derivative assets 0 0    
Total assets 0 0    
Liabilities        
Contingent consideration 879 841    
Derivative liabilities 0 0    
Total liabilities 879 841    
Fair Value, Measurements, Recurring | Level 3 | Foreign exchange contracts        
Assets        
Derivative assets 0 0    
Liabilities        
Derivative liabilities 0 0    
Fair Value, Measurements, Recurring | Level 3 | Interest rate swap contracts        
Assets        
Derivative assets 0 0    
Fair Value, Measurements, Recurring | Level 3 | Currency options        
Assets        
Derivative assets 0 0    
Liabilities        
Derivative liabilities 0 0    
Fair Value, Measurements, Recurring | Foreign government bonds        
Assets        
Investments 2 5    
Fair Value, Measurements, Recurring | Foreign government bonds | Level 1        
Assets        
Investments 0 0    
Fair Value, Measurements, Recurring | Foreign government bonds | Level 2        
Assets        
Investments 2 5    
Fair Value, Measurements, Recurring | Foreign government bonds | Level 3        
Assets        
Investments 0 0    
Fair Value, Measurements, Recurring | Corporate notes and bonds        
Assets        
Other assets 4 0    
Fair Value, Measurements, Recurring | Corporate notes and bonds | Level 1        
Assets        
Other assets 4 0    
Fair Value, Measurements, Recurring | Corporate notes and bonds | Level 2        
Assets        
Other assets 0 0    
Fair Value, Measurements, Recurring | Corporate notes and bonds | Level 3        
Assets        
Other assets 0 0    
Fair Value, Measurements, Recurring | U.S. government and agency securities        
Assets        
Other assets 82 84    
Fair Value, Measurements, Recurring | U.S. government and agency securities | Level 1        
Assets        
Other assets 82 84    
Fair Value, Measurements, Recurring | U.S. government and agency securities | Level 2        
Assets        
Other assets 0 0    
Fair Value, Measurements, Recurring | U.S. government and agency securities | Level 3        
Assets        
Other assets 0 0    
Fair Value, Measurements, Recurring | Publicly traded equity securities        
Assets        
Publicly traded equity securities 409 780    
Other assets 1,170 1,007    
Fair Value, Measurements, Recurring | Publicly traded equity securities | Level 1        
Assets        
Publicly traded equity securities 409 780    
Other assets 1,170 1,007    
Fair Value, Measurements, Recurring | Publicly traded equity securities | Level 2        
Assets        
Publicly traded equity securities 0 0    
Other assets 0 0    
Fair Value, Measurements, Recurring | Publicly traded equity securities | Level 3        
Assets        
Publicly traded equity securities 0 0    
Other assets $ 0 $ 0