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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Line Items]        
Valuation allowance   $ 483 $ 150  
U.S Statutory tax rate, percent   35.00%    
Deferred tax benefit due to reduced U.S tax rate and other effects of tax act   $ 283    
U.S. income tax rate on accumulated foreign subsidiary earnings on cash and other current assets   15.50%    
U.S. income tax rate on accumulated foreign subsidiary earnings on remaining earnings   8.00%    
Tax cuts and jobs act of 2017, incomplete accounting, provisional income tax expense   $ 529    
Provisional adjustment to valuation allowance on foreign tax credit due to 2017 Tax Act   $ 339    
Foreign unremitted earnings     9,300  
Estimated federal and state income tax amounts net of applicable credits on foreign unremitted earnings     2,600  
Percentage of dividend exemption on foreign earnings   100.00%    
Net interest and penalties   $ 3 6 $ 3
Unrecognized interest and penalties expense   15 11  
Unrecognized tax benefits that, if recognized, would impact effective tax rate   108    
Gross unrecognized tax benefit liability   107 74  
Net indemnification receivables   48 28 93
Decrease in gross unrecognized tax benefits     75  
Expected reduction in gross unrecognized tax benefits   20    
Baxalta Inc        
Income Taxes [Line Items]        
Decrease in gross unrecognized tax benefits     37  
Internal Revenue Service (IRS)        
Income Taxes [Line Items]        
Payment made for partially settlement on U.S. federal income tax audit for the period 2008-2013     $ 303  
Discontinued Operations        
Income Taxes [Line Items]        
Decrease in gross unrecognized tax benefits       $ 10
Scenario Forecast        
Income Taxes [Line Items]        
U.S Statutory tax rate, percent 21.00%      
Earliest Tax Year | Internal Revenue Service (IRS)        
Income Taxes [Line Items]        
Income tax period under audit     2008  
Earliest Tax Year | Federal Ministry of Finance, Germany        
Income Taxes [Line Items]        
Income tax period under audit     2008  
Earliest Tax Year | Ministry of Economic Affairs and Finance, Italy        
Income Taxes [Line Items]        
Income tax period under audit     2010  
Latest Tax Year | Internal Revenue Service (IRS)        
Income Taxes [Line Items]        
Income tax period under audit     2013  
Latest Tax Year | Federal Ministry of Finance, Germany        
Income Taxes [Line Items]        
Income tax period under audit     2011  
Latest Tax Year | Ministry of Economic Affairs and Finance, Italy        
Income Taxes [Line Items]        
Income tax period under audit     2012  
Domestic Tax Authority        
Income Taxes [Line Items]        
Operating loss carryforwards   413    
Foreign tax credit carryforwards   $ 348    
Domestic Tax Authority | Earliest Tax Year        
Income Taxes [Line Items]        
Operating loss carryforwards, expiration dates   2018    
Tax credit carryforwards, expiration dates   2018    
Domestic Tax Authority | Latest Tax Year        
Income Taxes [Line Items]        
Operating loss carryforwards, expiration dates   2037    
Tax credit carryforwards, expiration dates   2037    
Foreign Tax Authority        
Income Taxes [Line Items]        
Operating loss carryforwards   $ 1,600    
Foreign tax credit carryforwards   59    
Foreign Tax Authority | Tax Year 2018        
Income Taxes [Line Items]        
Operating loss carryforwards   $ 3    
Operating loss carryforwards, expiration dates   2018    
Foreign Tax Authority | Tax Year 2019        
Income Taxes [Line Items]        
Operating loss carryforwards   $ 2    
Operating loss carryforwards, expiration dates   2019    
Foreign Tax Authority | Tax Year 2020        
Income Taxes [Line Items]        
Operating loss carryforwards   $ 37    
Operating loss carryforwards, expiration dates   2020    
Foreign Tax Authority | Tax Year 2022        
Income Taxes [Line Items]        
Operating loss carryforwards   $ 4    
Operating loss carryforwards, expiration dates   2022    
Foreign Tax Authority | Tax Year 2021        
Income Taxes [Line Items]        
Operating loss carryforwards   $ 47    
Operating loss carryforwards, expiration dates   2021    
Foreign Tax Authority | Tax Year After 2022        
Income Taxes [Line Items]        
Operating loss carryforwards   $ 440    
Operating loss carryforwards, expiration dates   after 2022    
Foreign Tax Authority | Tax Year No Expiration        
Income Taxes [Line Items]        
Operating loss carryforwards   $ 1,100    
Operating loss carryforwards, expiration dates   No expiration date