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Identifiable Intangible Assets and Goodwill - Goodwill (Detail) $ in Millions | 9 Months Ended
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Oct. 01, 2017 USD ($)
Goodwill [Roll Forward] |  |
Balance, December 31, 2016 | $ 54,449 | [1]
Additions | 664 | [2]
Other | 966 | [3]
Balance, October 1, 2017 | 56,078 | [1]
IH [Member] |  |
Goodwill [Roll Forward] |  |
Balance, December 31, 2016 | 30,134 |
Additions | 572 | [2]
Other | 491 | [3]
Balance, October 1, 2017 | 31,197 |
EH [Member] |  |
Goodwill [Roll Forward] |  |
Balance, December 31, 2016 | 24,315 |
Additions | 92 | [2]
Other | 475 | [3]
Balance, October 1, 2017 | $ 24,882 |
[1] | Amounts may not add due to rounding.
[2] | IH additions primarily represent measurement period adjustments related to our Medivation acquisition, and EH additions relate to our acquisition of AstraZeneca’s small molecule anti-infectives business, which are subject to change until we complete the valuation of assets acquired and liabilities assumed (see Note 2A).
[3] | Primarily reflects the impact of foreign exchange and an adjustment of our estimate of goodwill associated with the HIS net assets sold.

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