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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]        
Beginning balance     $ (311)  
Provision $ (88) $ (72) (442) $ (300)
Utilization and other     469  
Ending balance (284)   (284)  
Employee Termination [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning balance     (294)  
Provision (62) (54) (380) (226)
Utilization and other     418  
Ending balance (256)   (256)  
Other [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning balance     (17)  
Provision (26) $ (18) (62) $ (72)
Utilization and other     51  
Ending balance $ (28)   $ (28)