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Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Assets        
Foreign government bonds $ 89 $ 89    
Publicly traded equity securities 1,915 1,787    
Derivative assets 377 182    
Liabilities        
Contingent consideration 902 841 $ 829 $ 767
Derivative liabilities 133 525    
Foreign government bonds        
Assets        
Foreign government bonds 2 5    
U.S. government and agency securities        
Assets        
Foreign government bonds 83 84    
Corporate notes and bonds        
Assets        
Foreign government bonds 4 0    
Fair Value, Measurements, Recurring        
Assets        
Investments 435 785    
Other assets 1,569 1,091    
Derivative assets 377 182    
Total assets 2,381 2,058    
Liabilities        
Contingent consideration 902 841    
Derivative liabilities 133 525    
Total liabilities 1,035 1,366    
Fair Value, Measurements, Recurring | Foreign exchange contracts        
Assets        
Derivative assets 230 90    
Liabilities        
Derivative liabilities 132 505    
Fair Value, Measurements, Recurring | Interest rate swaps        
Assets        
Derivative assets 26 55    
Fair Value, Measurements, Recurring | Currency options        
Assets        
Derivative assets 121 37    
Liabilities        
Derivative liabilities 1 20    
Fair Value, Measurements, Recurring | Level 1        
Assets        
Investments 433 780    
Other assets 1,569 1,091    
Derivative assets 0 0    
Total assets 2,002 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 swaps        
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 377 182    
Total assets 379 187    
Liabilities        
Contingent consideration 0 0    
Derivative liabilities 133 525    
Total liabilities 133 525    
Fair Value, Measurements, Recurring | Level 2 | Foreign exchange contracts        
Assets        
Derivative assets 230 90    
Liabilities        
Derivative liabilities 132 505    
Fair Value, Measurements, Recurring | Level 2 | Interest rate swaps        
Assets        
Derivative assets 26 55    
Fair Value, Measurements, Recurring | Level 2 | Currency options        
Assets        
Derivative assets 121 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 902 841    
Derivative liabilities 0 0    
Total liabilities 902 841    
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 swaps        
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        
Foreign government bonds 2 5    
Fair Value, Measurements, Recurring | Foreign government bonds | Level 1        
Assets        
Foreign government bonds 0 0    
Fair Value, Measurements, Recurring | Foreign government bonds | Level 2        
Assets        
Foreign government bonds 2 5    
Fair Value, Measurements, Recurring | Foreign government bonds | Level 3        
Assets        
Foreign government bonds 0 0    
Fair Value, Measurements, Recurring | Publicly traded equity securities        
Assets        
Publicly traded equity securities 433 780    
Other assets 1,482 1,007    
Fair Value, Measurements, Recurring | Publicly traded equity securities | Level 1        
Assets        
Publicly traded equity securities 433 780    
Other assets 1,482 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    
Fair Value, Measurements, Recurring | U.S. government and agency securities        
Assets        
Other assets 83 84    
Fair Value, Measurements, Recurring | U.S. government and agency securities | Level 1        
Assets        
Other assets 83 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 | 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