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Property, Plant and Equipment - Summary of Property, Plant and Equipment Leased (right- of- use assets) (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items]      
Right-of-use assets, net carrying amount $ 2,049   $ 2,029
Right-of-use assets, depreciation for the period (244) $ (250)  
Land and buildings [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Right-of-use assets, net carrying amount 1,765   1,723
Right-of-use assets, depreciation for the period (169) (173)  
Machinery, equipment and other [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Right-of-use assets, net carrying amount 284   $ 306
Right-of-use assets, depreciation for the period $ (75) $ (77)