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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.

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