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LONG-TERM DEBT AND CREDIT FACILITIES - FAIR VALUE (DETAILS) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Debt Disclosures    
Long-term debt, including current portion, Carrying Value $ 3,803 $ 3,263
Long-term debt, including current portion, Fair Value 3,940 3,468
Level 2    
Debt Disclosures    
Long-term debt, including current portion, Fair Value 3,887 3,273
Level 3    
Debt Disclosures    
Long-term debt, including current portion, Fair Value $ 53 $ 195