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Other Impairments, Restructuring and Other Items - Summary of Restructuring Charges (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 88 $ 72 $ 442 $ 300
Employee Termination [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 62 54 380 226
Other [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 26 18 62 72
Cost of Sales [Member]        
Restructuring Cost and Reserve [Line Items]        
Other Restructuring charges 8 3 23 5
Selling and Marketing Expenses [Member]        
Restructuring Cost and Reserve [Line Items]        
Other Restructuring charges   $ 3   $ 3
Other Items [Member]        
Restructuring Cost and Reserve [Line Items]        
Other Restructuring charges $ 16   $ 54