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Property, Plant and Equipment -Summary of Property, Plant and Equipment owned and Leased assets (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment $ 24,718 $ 27,544
Property, plant and equipment owned [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 22,669 25,515
Property, plant and equipment leased (right-of-use assets) [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment $ 2,049 $ 2,029