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LONG-TERM DEBT - SCHEDULE OF LONG-TERM DEBT (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]      
Long-term Debt $ 686 $ 803  
Less current portion 115 117  
Long-term debt, net of current portion $ 571 $ 686  
Weighted-average variable-interest rate 5.70% 5.70%  
Weighted-average variable-interest rate 1.80% 1.60%  
Proceeds from issuance of long-term debt $ 0 $ 51 $ 0
Long-term debt payments 116 119 $ 161
Long-term Debt, Fiscal Year Maturity [Abstract]      
2016 115    
2017 121    
2018 151    
2019 114    
2020 116    
Thereafter 69    
Long-term Debt 686 803  
Fixed-rate notes payable due through 2024      
Debt Instrument [Line Items]      
Long-term Debt 520 614  
Long-term Debt, Fiscal Year Maturity [Abstract]      
Long-term Debt 520 614  
Variable-rate notes payable due through 2025      
Debt Instrument [Line Items]      
Long-term Debt 166 189  
Long-term Debt, Fiscal Year Maturity [Abstract]      
Long-term Debt $ 166 $ 189