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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Income Taxes [Line Items] |  |
Effective income tax rate | (1.70%) | 9.50%
Effective income tax rate excluding discrete items | 22.00% |
Decrease in gross unrecognized tax benefits | $ 85 |
Baxalta Inc |  |
Income Taxes [Line Items] |  |
Decrease in gross unrecognized tax benefits | 34 |
Internal Revenue Service (IRS) |  |
Income Taxes [Line Items] |  |
Payment made for partially settlement on US Federal income tax audit for the period 2008-2013 | $ 303 |
Internal Revenue Service (IRS) | Earliest Tax Year |  |
Income Taxes [Line Items] |  |
Income tax period under audit | 2008 |
Internal Revenue Service (IRS) | Latest Tax Year |  |
Income Taxes [Line Items] |  |
Income tax period under audit | 2013 |
Federal Ministry of Finance, Germany | Earliest Tax Year |  |
Income Taxes [Line Items] |  |
Income tax period under audit | 2008 |
Federal Ministry of Finance, Germany | Latest Tax Year |  |
Income Taxes [Line Items] |  |
Income tax period under audit | 2011 |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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- Definition Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28446-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28511-109314 + Details
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