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Financial Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2017
Financial instruments fair value gains        
Fair value movements on equity investments $ 38 $ 156    
Reconciliation of changes in contingent liabilities in business combination        
Contingent liabilities recognised in business combination at beginning of period   5,534 $ 5,457  
Settlements   (151) (260)  
Revaluations   38 (71)  
Discount unwind   208 205  
Contingent liabilities recognised in business combination 5,629 5,534 $ 5,457 $ 5,331
Diabetes Alliance        
Reconciliation of changes in contingent liabilities in business combination        
Contingent liabilities recognised in business combination at beginning of period   4,477    
Settlements   (151)    
Discount unwind   168    
Contingent liabilities recognised in business combination 4,494 4,477    
Other        
Reconciliation of changes in contingent liabilities in business combination        
Contingent liabilities recognised in business combination at beginning of period   1,057    
Revaluations   38    
Discount unwind   40    
Contingent liabilities recognised in business combination 1,135 1,057    
Interest-Bearing Loans and Borrowings        
Financial instruments fair value gains        
Total carrying value 19,667      
Fair value 20,346      
Other Investments        
Financial instruments fair value gains        
Fair value 1,866      
Loans        
Financial instruments fair value gains        
Fair value 1,287      
Derivatives        
Financial instruments fair value gains        
Fair value $ 465      
Level 3        
Financial instruments fair value gains        
Fair value movements on equity investments   $ 71