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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Fair Value Measurements) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
percentage
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Business Combination, Contingent Consideration, Liability $ 106 $ 0  
Equity Securities, FV-NI 2,195 479  
Available-for-sale Securities, Amortized Cost Basis 3,807 3,660  
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 8 0  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (1) (37)  
Available-for-sale securities, Fair value 3,814 3,623  
Total securities 6,009 4,102  
Investments, Fair Value Disclosure 6,009 4,102  
Equity Securities without Readily Determinable Fair Value, Amount 781 206  
Equity Securities, FV-NI, Gain (Loss) 170 (530)  
Equity Securities, FV-NI, Realized Gain (Loss) 14 7  
Equity Securities, FV-NI, Unrealized Gain (Loss) 156 (537)  
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability 523 0 $ 0
Business Combination, Consideration Transferred, Liabilities Incurred 106    
Fair Value Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Business Combination, Contingent Consideration, Liability 0 0  
Cash Equivalents, Fair Value 0 0  
Total derivatives at fair value, assets 0 0  
Total derivatives at fair value, liabilities 0 0  
Fair Value Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Business Combination, Contingent Consideration, Liability 0 0  
Cash Equivalents, Fair Value 10,448 6,173  
Total derivatives at fair value, assets 140 44  
Total derivatives at fair value, liabilities (40) (31)  
Fair Value Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash Equivalents, Fair Value 0    
Total derivatives at fair value, assets 0    
Total derivatives at fair value, liabilities 0    
Portion at Other than Fair Value Measurement [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity Method Investments 429 114  
Marketable debt securities - current [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, Fair Value Disclosure 3,047 1,848  
Other Current Assets [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, Fair Value Disclosure 0 125  
Marketable debt securities - non-current [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, Fair Value Disclosure 767 1,775  
Other Assets [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, Fair Value Disclosure 2,195 354  
Other Assets [Member] | Fair Value Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity Securities, FV-NI 2,020 88  
Other Assets [Member] | Fair Value Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity Securities, FV-NI 175 391  
Other Assets [Member] | Fair Value Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity Securities, FV-NI 0    
Certificates of Deposit [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale 1,227 971  
Debt Securities, Available-for-sale, Amortized Cost 1,227 971  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 0  
Certificates of Deposit [Member] | Fair Value Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale 0 0  
Certificates of Deposit [Member] | Fair Value Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale 1,227 971  
Certificates of Deposit [Member] | Fair Value Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale 0    
Commercial Paper [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale 1,093 273  
Debt Securities, Available-for-sale, Amortized Cost 1,093 273  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 0  
Commercial Paper [Member] | Fair Value Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale 0 0  
Commercial Paper [Member] | Fair Value Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale 1,093 273  
Commercial Paper [Member] | Fair Value Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale 0    
Corporate Debt Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale 1,494 2,379  
Debt Securities, Available-for-sale, Amortized Cost 1,487 2,416  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 8 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (1) (37)  
Corporate Debt Securities [Member] | Fair Value Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale 0 0  
Corporate Debt Securities [Member] | Fair Value Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale 1,494 2,379  
Corporate Debt Securities [Member] | Fair Value Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale 0    
Contingent Value Rights [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Business Combination, Contingent Consideration, Liability 2,275 0  
Contingent Value Rights [Member] | Fair Value Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Business Combination, Contingent Consideration, Liability 2,275 0  
Contingent Value Rights [Member] | Fair Value Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Business Combination, Contingent Consideration, Liability 0 $ 0  
Contingent Value Rights [Member] | Fair Value Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Business Combination, Contingent Consideration, Liability 0    
Other Acquisition Related Contingent Consideration and Success Payments [Member] | Fair Value Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Business Combination, Contingent Consideration, Liability $ 106    
Minimum [Member] | Measurement Input, Discount Rate [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Instrument, Measurement Input | percentage 0.022    
Minimum [Member] | Probability of payment [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Instrument, Measurement Input | percentage 0    
Maximum [Member] | Measurement Input, Discount Rate [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Instrument, Measurement Input | percentage 0.032    
Maximum [Member] | Probability of payment [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Instrument, Measurement Input | percentage 0.68    
Weighted Average [Member] | Measurement Input, Discount Rate [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Instrument, Measurement Input | percentage 0.026    
Weighted Average [Member] | Probability of payment [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Instrument, Measurement Input | percentage 0.041