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FAIR VALUE MEASUREMENTS - Summary of Financial Instruments at Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]        
Cash $ 791 $ 543 $ 494 $ 268
Short-term investments 843 203    
Net derivative contracts 28 (3)    
Level 1 [Member]        
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]        
Cash 791 543    
Short-term investments 843 203    
Net derivative contracts 0 0    
Level 2 [Member]        
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]        
Cash 0 0    
Short-term investments 0 0    
Net derivative contracts 28 (3)    
Level 3 [Member]        
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]        
Cash 0 0    
Short-term investments 0 0    
Net derivative contracts $ 0 $ 0