XML 321 R143.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Property, plant and equipment Property, plant and equipment - Summary of owned and leased assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, plant and equipment [abstract]        
Property, Plant and Equipment, Owned $ 56,307   $ 56,330  
Property, plant and equipment – owned 56,307   56,361 $ 62,093
Right of use assets – leased 1,065 $ 1,022 0  
Finance leases under IAS 17 0   31  
Net book value $ 57,372      
Net book value     $ 56,361