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SHORT-TERM DEBT AND CREDIT FACILITIES (DETAILS) - USD ($)
$ in Millions
Nov. 20, 2014
Nov. 17, 2011
Dec. 31, 2015
Dec. 31, 2014
Lines of Credit:        
Short-term borrowings weighted-average interest rate (as a percent)     4.92% 4.33%
Short-term Debt     $ 648 $ 594
Secured        
Lines of Credit:        
Short-term Debt     $ 25 $ 25
Secured | Minimum        
Lines of Credit:        
Short-term line of credit percentage rate     2.33% 2.33%
Secured | Maximum        
Lines of Credit:        
Short-term line of credit percentage rate     9.75% 9.75%
Unsecured, fixed interest rate        
Lines of Credit:        
Short-term Debt     $ 76 $ 90
Unsecured, fixed interest rate | Minimum        
Lines of Credit:        
Short-term line of credit percentage rate     13.38% 13.38%
Unsecured, fixed interest rate | Maximum        
Lines of Credit:        
Short-term line of credit percentage rate     18.50% 18.50%
Unsecured, variable interest rate        
Lines of Credit:        
Short-term Debt     $ 547 $ 479
Unsecured, variable interest rate | Minimum        
Lines of Credit:        
Short-term line of credit percentage rate, variable     1.17% 1.17%
Unsecured, variable interest rate | Maximum        
Lines of Credit:        
Short-term line of credit percentage rate, variable     32.00% 32.00%
Unsecured Local Borrowings in High Interest Rate Jurisdictions        
Lines of Credit:        
Short-term borrowings weighted-average interest rate (as a percent)     16.06% 11.95%
Short-term Debt     $ 130 $ 155
2014 Liquidity facility        
Lines of Credit:        
Credit facility, borrowings outstanding     0 0
Maximum borrowing capacity $ 600      
Term of credit agreement 5 years      
2011 Liquidity facility        
Lines of Credit:        
Maximum borrowing capacity   $ 600    
Term of credit agreement   5 years    
Commercial paper program        
Lines of Credit:        
Commercial paper, borrowing outstanding     0 0
Bilateral short-term credit line        
Lines of Credit:        
Short-term Debt     0 $ 50
Local bank lines of credit        
Lines of Credit:        
Short-term Debt     $ 626