v3.10.0.1
Other (Income)/Deductions - Net - Footnotes - Additional Information About Impaired Intangible Assets (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Total [1] $ 910,000,000    
Impairment 3,103,000,000 $ 337,000,000 $ 869,000,000
Developed Technology Rights [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Intangible assets––Developed technology rights [1],[2] 665,000,000    
Impairment 2,647,000,000 [2] $ 20,000,000  
Licensing Agreements And Other [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Intangible assets––Developed technology rights [1],[2] 150,000,000    
Impairment [2] 242,000,000    
Level 1 [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Total [1] 0    
Level 1 [Member] | Developed Technology Rights [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Intangible assets––Developed technology rights [1],[2] 0    
Level 1 [Member] | Licensing Agreements And Other [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Intangible assets––Developed technology rights [1],[2] 0    
Level 2 [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Total [1] 0    
Level 2 [Member] | Developed Technology Rights [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Intangible assets––Developed technology rights [1],[2] 0    
Level 2 [Member] | Licensing Agreements And Other [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Intangible assets––Developed technology rights [1],[2] 0    
Level 3 [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Total [1] 910,000,000    
Level 3 [Member] | Developed Technology Rights [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Intangible assets––Developed technology rights [1],[2] 665,000,000    
Level 3 [Member] | Licensing Agreements And Other [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Intangible assets––Developed technology rights [1],[2] 150,000,000    
In Process Research and Development [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Intangible assets––IPR&D [1],[2] 95,000,000    
Impairment [2] 214,000,000    
In Process Research and Development [Member] | Level 1 [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Intangible assets––IPR&D [1],[2] 0    
In Process Research and Development [Member] | Level 2 [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Intangible assets––IPR&D [1],[2] 0    
In Process Research and Development [Member] | Level 3 [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Intangible assets––IPR&D [1],[2] $ 95,000,000    
[1] The fair value amount is presented as of the date of impairment, as these assets are not measured at fair value on a recurring basis. See also Note 1E.
[2] Reflects intangible assets written down to fair value in 2018. Fair value was determined using the income approach, specifically the multi-period excess earnings method, also known as the discounted cash flow method. We started with a forecast of all the expected net cash flows associated with the asset and then applied an asset-specific discount rate to arrive at a net present value amount. Some of the more significant estimates and assumptions inherent in this approach include: the amount and timing of the projected net cash flows, which includes the expected impact of competitive, legal and/or regulatory forces on the product; the discount rate, which seeks to reflect the various risks inherent in the projected cash flows; and the tax rate, which seeks to incorporate the geographic diversity of the projected cash flows.