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DISPOSAL GROUPS CLASSIFIED AS HELD-FOR-SALE - Assets and Liabilities Held-for-sale (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Assets and liabilities classified as held for sale    
Assets held-for-sale $ 2,027 $ 533
Liabilities held-for-sale 47 50
Italy Joint Venture    
Assets and liabilities classified as held for sale    
Assets held-for-sale 1,564  
Deodar    
Assets and liabilities classified as held for sale    
Assets held-for-sale 462 509
Liabilities held-for-sale 47 35
Laos    
Assets and liabilities classified as held for sale    
Assets held-for-sale   22
Liabilities held-for-sale   15
Other individual assets    
Assets and liabilities classified as held for sale    
Assets held-for-sale $ 1 $ 2