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LONG-TERM DEBT AND CREDIT FACILITIES - PRINCIPAL MATURITIES (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Principal Maturities of Long-Term Debt      
2017 $ 938    
2018 14    
2019 992    
2020 511    
2021 18    
Thereafter 1,551    
Total 4,024    
Changes in long-term debt attributable to fair value hedge 17    
Interest paid, net of capitalization $ 234 $ 227 $ 223