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LONG-TERM DEBT AND CREDIT FACILITIES - PRINCIPAL MATURITIES (DETAILS) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Principal Maturities of Long-Term Debt      
2016 $ 869    
2017 937    
2018 461    
2019 1,000    
2020 511    
Thereafter 24    
Total 3,802    
Interest paid, net of capitalization 227 $ 223 $ 330
Interest rate | Long-term debt      
Principal Maturities of Long-Term Debt      
Unamortized net gains of terminated agreement 4    
Unamortized net losses of open agreement $ 3