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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]        
Beginning balance     $ (311)  
Provision $ (107) $ (98) (354) $ (228)
Utilization and other     335  
Ending balance (330)   (330)  
Employee Termination [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning balance     (294)  
Provision (90) (79) (318) (174)
Utilization and other     310  
Ending balance (302)   (302)  
Other [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning balance     (17)  
Provision (17) $ (19) (36) $ (54)
Utilization and other     25  
Ending balance $ (28)   $ (28)