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Investment in Securities - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Available For Sale Securities [Line Items] |  |  |  |
Company average share price | $ 25.62 | $ 20.92 | $ 25.62 |
Net gain on sale |  | $ 67 | $ 1,083 | $ 720
Mylan [Member] |  |  |  |
Available For Sale Securities [Line Items] |  |  |  |
Company average share price | $ 40.2 | $ 11 | $ 40.2 |
Net gain (loss) mylan |  | $ 2 |  |
Net gain on sale | $ 36 | $ 10 |  |
Sale of shares | 17 |  |  |
Cash consideration | $ 702 |  |  |

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- Definition Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684 + Details
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