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Impact of New Accounting Standards - Additional Information (Detail) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jul. 01, 2019
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Disclosure of initial application of standards or interpretations [line items]        
Increase in lease liabilities   $ 2,578   $ 715 [1]
Lease interest recorded in net finance costs   48 $ 23 $ 47
Depreciation right of use assets   357    
Principal repayments on lease liabilities   401    
Interest repayments on lease liabilities   48    
Construction in progress [member]        
Disclosure of initial application of standards or interpretations [line items]        
Capitalised depreciation right of use assets   19    
Property, plant and equipment [member]        
Disclosure of initial application of standards or interpretations [line items]        
Right-of-use assets   2,188    
Property, plant and equipment [member] | Land and buildings [member]        
Disclosure of initial application of standards or interpretations [line items]        
Right-of-use assets   735    
Property, plant and equipment [member] | Property, plant and equipment [member]        
Disclosure of initial application of standards or interpretations [line items]        
Right-of-use assets   1,453    
Property, plant and equipment [member] | Freight Contracts [Member]        
Disclosure of initial application of standards or interpretations [line items]        
Right-of-use assets   $ 328    
Increase (decrease) due to application of IFRS 16 [member]        
Disclosure of initial application of standards or interpretations [line items]        
Increase in lease liabilities $ 2,300      
Right-of-use assets 2,200      
Adjustments for net increase decrease in net asset. $ 100      
Weighted average incremental borrowing rate 2.10%      
[1] Relates to existing finance leases at 1 July 2019.