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Basis of Preparation and Accounting Policies (Details) - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended
Jan. 01, 2019
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Application of new accounting standards        
Right-of-use assets   $ 702    
Current tax liabilities   1,141 $ 1,273 $ 1,164
Trade and other payables   12,637 10,913 12,841
Retained earnings   3,265 5,879 5,683
Net decrease in cash and cash equivalents in the period   643 (379)  
Net cash (outflow)/inflows from financing activities   941 (481)  
Net cash inflow/(outflow) from operating activities   491 (75)  
Going concern        
Financial resources   9,500    
Cash balances   5,400    
Undrawn committed bank facilities   4,100    
Interest-bearing loans and borrowings   $ 1,629 $ 4,215 $ 1,754
Par value per ordinary share   $ 0.25 $ 0.25  
Proceeds from issue of share capital   $ 3,495 $ 16  
Years 3 and 4        
Going concern        
Undrawn committed bank facilities   3,400    
Years 2 and 3        
Going concern        
Undrawn committed bank facilities   500    
Years 1 and 2        
Going concern        
Undrawn committed bank facilities   200    
Due within one year        
Going concern        
Undrawn committed bank facilities   $ 1,800    
IFRS 16        
Application of new accounting standards        
Right-of-use assets $ 722      
Lease liabilities $ 720      
Interest rate on lease liabilities 3.00%      
Retained earnings $ 0      
Net decrease in cash and cash equivalents in the period 0      
Net cash (outflow)/inflows from financing activities (84)      
Net cash inflow/(outflow) from operating activities 84      
IFRIC 23        
Application of new accounting standards        
Current tax liabilities (51)      
Trade and other payables (3)      
Retained earnings $ 54