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Summary of Operating Results Which Have Been Reflected As Discontinued Operations (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Total (loss) income from discontinued operations $ (10) $ 3 $ 1 $ (1) $ 3 $ 3 $ (7) $ (7) $ (1) $ 575
Baxalta Inc | Discontinued Operations, Held-for-disposition                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Net sales               7 148 2,895
Cost of sales               (5) (139) (1,214)
Marketing and administrative expenses               (1) (20) (547)
Research and development expenses                   (389)
Other income and expense items that are not major                 1 7
Total (loss) income from discontinued operations before income taxes               1 (10) 752
Gain on disposal of discontinued operations               2 19  
Income tax expense                 10 177
Total (loss) income from discontinued operations               $ 3 $ (1) $ 575