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Other Assets Impairments, Restructuring and Other Items - Summary of Restructuring Accruals (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]    
Beginning balance $ (311) $ (153)
Provision (488) (535)
Utilization and other 566 377
Ending balance (233) (311)
Employee Termination [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning balance (294) (144)
Provision (410) (443)
Utilization and other 500 293
Ending balance (204) (294)
Other Exit and Disposal [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning balance (17) (9)
Provision (78) (92)
Utilization and other 66 84
Ending balance $ (29) $ (17)