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FINANCIAL ASSETS AND LIABILITIES - Offsetting financial assets and liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Other financial liabilities (non-current)    
Net financial liabilities    
Gross amounts recognized $ 10,362 $ 8,070
Net amounts presented in the statement of financial position 10,362 8,070
Net Amount 10,362 8,070
Other financial liabilities (current)    
Net financial liabilities    
Gross amounts recognized 1,268 3,047
Gross amounts set off in the statement of financial position   (1)
Net amounts presented in the statement of financial position 1,268 3,046
Net Amount 1,268 3,046
Trade and other payables    
Net financial liabilities    
Gross amounts recognized 1,595 1,843
Gross amounts set off in the statement of financial position (72) (99)
Net amounts presented in the statement of financial position 1,523 1,744
Net Amount 1,523 1,744
Other financial assets (non-current)    
Net financial assets    
Gross amounts recognized 34 306
Net amounts presented in the consolidated statement of financial position 34 306
Net Amount 34 306
Other financial assets (current)    
Net financial assets    
Gross amounts recognized 1,130 190
Net amounts presented in the consolidated statement of financial position 1,130 190
Net Amount 1,130 190
Trade and other receivables    
Net financial assets    
Gross amounts recognized 817 783
Gross amounts set off in the consolidated statement of financial position (72) (98)
Net amounts presented in the consolidated statement of financial position 745 685
Net Amount $ 745 $ 685