SEPARATION OF BAXALTA INCORPORATED - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended	6 Months Ended	12 Months Ended
	Jul. 01, 2015	Mar. 31, 2019	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of common stock retained				100.00%
Cash flows from operations - discontinued operations		$ (6)	$ (6)	$ (6)	$ 0	$ (16)
Transition Services Agreement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Reduction in marketing and administrative expense					9	56
Baxalta Inc
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash flows from operations - discontinued operations				$ (6)	$ 0	$ (16)
Spinoff
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of outstanding common stock distributed	80.50%
Percentage of common stock retained	19.50%
Common stock, outstanding (in shares)	131,902,719
Number Of Shares Issued In Spin Off For Each Share Owned In Former Parent	1
Percentage of ownership for equity method investment	19.50%