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FINANCIAL ASSETS (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Current    
Marketable securities $ 256 $ 265
Restricted cash 170 376
Derivative contracts 108 223
Loans and notes receivable 31 22
Total current 565 886
Non-current    
Marketable securities 0 1
Restricted cash 198 32
Derivative contracts 27 20
Loans and notes receivable 122 150
Other financial assets 287 280
Total non-current $ 634 $ 483