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Identifiable Intangible Assets and Goodwill - Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Roll Forward] |  |  |  |  |
Beginning balance |  | $ 55,952 | [1] | $ 54,449 |
Additions | [2] |  |  | 664 |
Other |  | (2,541) | [3] | 840 | [4]
Ending balance | [1] | 53,411 |  | 55,952 |
Innovative Health Segment [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Beginning balance |  | 31,141 |  | 30,134 |
Additions | [2] |  |  | 572 |
Other |  | (2,264) | [3] | 435 | [4]
Ending balance |  | 28,877 |  | 31,141 |
Essential Health Segment [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Beginning balance |  | 24,811 |  | 24,315 |
Additions | [2] |  |  | 92 |
Other |  | (277) | [3] | 404 | [4]
Ending balance |  | 24,534 |  | 24,811 |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Consumer Healthcare [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill |  | $ 1,972 |  | $ 0 |
[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 (see Note 2A).
[3] | Primarily reflects the impact of the reclassification of $2.0 billion to Assets held for sale during the fourth quarter of 2018 (see Note 2C), foreign exchange and the contribution of the allogeneic CAR T developmental program assets and operations to Allogene that constituted a business for accounting purposes (see Note 2B).
[4] | 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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