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Identifiable Intangible Assets and Goodwill - Goodwill (Detail) $ in Millions | 9 Months Ended
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Sep. 30, 2018 USD ($)
Goodwill [Roll Forward] |  |
Balance, December 31, 2017 | $ 55,952 | [1]
Other | (338) | [2]
Balance, September 30, 2018 | 55,614 | [1]
IH [Member] |  |
Goodwill [Roll Forward] |  |
Balance, December 31, 2017 | 31,141 |
Other | (178) | [2]
Balance, September 30, 2018 | 30,964 |
EH [Member] |  |
Goodwill [Roll Forward] |  |
Balance, December 31, 2017 | 24,811 |
Other | (160) | [2]
Balance, September 30, 2018 | $ 24,651 |
[1] | Amounts may not add due to rounding.
[2] | Primarily reflects the impact of foreign exchange, as well as the contribution of the allogeneic CAR T developmental program assets and operations to Allogene that constituted a business for accounting purposes (see Note 2B).

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition Amount of increase (decrease), classified as other, of an asset representing the future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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