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Other Impairments, Restructuring and Other Items - Components of and Changes in Company's Restructuring Accruals (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]    
Beginning balance $ (311)  
Provision (247) $ (130)
Utilization and other 136  
Ending balance (422)  
Employee Termination [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning balance (294)  
Provision (228) (95)
Utilization and other 129  
Ending balance (393)  
Other [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning balance (17)  
Provision (19) $ (35)
Utilization and other 7  
Ending balance $ (29)