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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
shares in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Mar. 31, 2019
Jun. 27, 2017
Significant Accounting Policies [Line Items]          
Maturity period of investments description three months or less        
Minimum derivative financial instrument's term (months) 2 months        
Maximum derivative financial instrument's term (months) 24 months        
Additional inventory reserve charges $ 49,000,000 $ 114,000,000 $ 606,000,000    
Inventory reserves total $ 644,000,000 $ 800,000,000      
Percentage of inventory reserve 17.70% 21.00%      
Depreciation expense related to property, plant and equipment $ 349,000,000 $ 359,000,000 370,000,000    
Accumulated depreciation 2,687,000,000 2,559,000,000      
Accumulated depreciation for capital leases 30,000,000        
Impairment of long-lived assets 21,000,000 10,000,000 54,000,000    
Cash payment for acquisition 280,000,000 86,000,000 230,000,000    
Net foreign currency transaction gains (losses) (52,000,000) (3,000,000) $ (10,000,000)    
Net revenue recognized from performance obligations satisfied in previous periods 65,000,000        
Remaining performance obligations 1,813,000,000        
Net allowances for doubtful accounts $ 161,000,000 $ 187,000,000      
Anti-dilutive stock options outstanding 20 12 14    
Five Year Unsecured Revolving Credit Facility [Member]          
Significant Accounting Policies [Line Items]          
Credit facility, borrowing capacity         $ 3,000,000,000
Scenario, Forecast [Member] | Five Year Unsecured Revolving Credit Facility [Member]          
Significant Accounting Policies [Line Items]          
Credit facility, borrowing capacity       $ 3,000,000,000  
Scenario, Forecast [Member] | Minimum [Member]          
Significant Accounting Policies [Line Items]          
Lease assets       500,000,000  
Lease liabilities       500,000,000  
Scenario, Forecast [Member] | Maximum [Member]          
Significant Accounting Policies [Line Items]          
Lease assets       650,000,000  
Lease liabilities       $ 650,000,000