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FINANCIAL ASSETS (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Current:    
Foreign currency forward contracts $ 10 $ 132
Loans and receivables 43 73
Marketable securities 85 3
Other 54 33
Total current 192 241
Non-current:    
Cross currency interest rate swaps 243 589
Loans and receivables 210 172
Foreign currency forward contracts 226 78
Other 51 61
Total non-current $ 730 $ 900