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FINANCE COSTS, NET (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
May 02, 2013
Sep. 30, 2008
Disclosure of Detailed Information about Finance Income (Expense) [Line Items]        
Interest $ 511 $ 591    
Amortization of debt issue costs 5 17    
Amortization of discount 1 2    
Accretion 67 50    
Loss on debt extinguishment 127 129    
Finance income (14) (13)    
Total 691 775    
Interest paid, classified as financing activities $ 425 $ 513    
4.1% Notes Due 2023        
Disclosure of Detailed Information about Finance Income (Expense) [Line Items]        
Borrowings, interest rate (as percent) 4.10%      
6.95% Notes Due 2019        
Disclosure of Detailed Information about Finance Income (Expense) [Line Items]        
Borrowings, interest rate (as percent) 6.95%      
2.5 Percent Notes Due 2018        
Disclosure of Detailed Information about Finance Income (Expense) [Line Items]        
Borrowings, interest rate (as percent)   2.50% 2.50%  
4.4 Percent Notes Due 2021        
Disclosure of Detailed Information about Finance Income (Expense) [Line Items]        
Borrowings, interest rate (as percent)   4.40%    
4.95 Percent Notes Due 2020        
Disclosure of Detailed Information about Finance Income (Expense) [Line Items]        
Borrowings, interest rate (as percent)   4.95%    
6.8 Percent Notes Due 2019        
Disclosure of Detailed Information about Finance Income (Expense) [Line Items]        
Borrowings, interest rate (as percent)   6.80%   6.80%
6.95 Percent Notes Due 2020        
Disclosure of Detailed Information about Finance Income (Expense) [Line Items]        
Borrowings, interest rate (as percent)   6.95%    
Interest rate hedges        
Disclosure of Detailed Information about Finance Income (Expense) [Line Items]        
Gain on interest rate hedges $ (6) $ (1)