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Other Impairments, Restructuring and Other Items - Summary of Restructuring Charges (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 107 $ 98 $ 354 $ 228
Employee Termination [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 90 79 318 174
Other [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 17 $ 19 $ 36 $ 54