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INVESTMENTS IN JOINT VENTURES AND ASSOCIATES - Italy joint venture - Statement of financial position (Details) - USD ($)
$ in Millions
12 Months Ended
Nov. 05, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of financial position          
Non-current assets   $ 15,113 $ 16,643    
Current assets   3,875 4,550    
Assets held for sale   533      
Total assets   19,521 21,193    
Non-current liabilities   (10,937) (8,593)    
Current liabilities   (4,607) (6,557)    
Liabilities relating to assets held for sale   (50)      
Cash and cash equivalents   1,304 2,942 $ 3,614 $ 6,342
Current financial liabilities   (1,268) (3,046)    
Non-current financial liabilities   (10,362) (8,070)    
Italy Joint Venture          
Statement of financial position          
Non-current assets   17,672 17,469    
Current assets   2,782 2,579    
Assets held for sale   289 53    
Total assets   20,743 20,101    
Non-current liabilities   (13,166) (12,673)    
Current liabilities   (3,729) (3,322)    
Liabilities relating to assets held for sale   (7)      
Total liabilities   (16,902) (15,995)    
Net assets   $ 3,841 $ 4,106    
Ownership interest in joint venture (in percentage) 50.00% 50.00% 50.00%    
Company's share of Italy Joint Venture net assets   $ 1,921 $ 2,053    
Carrying amount   1,921 2,053    
Cash and cash equivalents   743 666    
Current financial liabilities   (59) (186)    
Non-current financial liabilities   (12,406) (12,409)    
Dividends received   $ 0 $ 0