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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:      
Net operating loss carryforwards $ 587 $ 184  
Stock-based compensation 113 113  
Reserves and accruals not currently deductible 444 423  
Excess of tax basis over book basis of intangible assets 1,177 1,232  
Upfront and milestone payments 1,144 988  
Research and other credit carryforwards 219 247  
Equity investments 116 0  
Liability related to future royalties 247 0  
Other, net 311 168  
Total deferred tax assets before valuation allowance 4,358 3,355  
Valuation allowance (398) (217) $ (331)
Total deferred tax assets 3,960 3,138  
Deferred tax liabilities:      
Property, plant and equipment (202) (88)  
Excess of book basis over tax basis of intangible assets (6,168) (1,401)  
Other (202) (93)  
Total deferred tax liabilities (6,572) (1,582)  
Net deferred tax assets (liabilities) $ (2,612)    
Net deferred tax assets (liabilities)   $ 1,556