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FAIR VALUE MEASUREMENTS - Assets Measured on Non-Recurring Basis (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of fair value measurement of assets [line items]    
Total assets $ 25,308 $ 25,264
Impairment reversals 254  
Other assets | Non-recurring fair value measurement    
Disclosure of fair value measurement of assets [line items]    
Total assets 45  
Impairment loss 30  
Other assets | Non-recurring fair value measurement | Quoted prices in active markets for identical assets (Level 1)    
Disclosure of fair value measurement of assets [line items]    
Total assets 0  
Other assets | Non-recurring fair value measurement | Significant other observable inputs (Level 2)    
Disclosure of fair value measurement of assets [line items]    
Total assets 0  
Other assets | Non-recurring fair value measurement | Significant unobservable inputs (Level 3)    
Disclosure of fair value measurement of assets [line items]    
Total assets 45  
Property, plant and equipment | Non-recurring fair value measurement    
Disclosure of fair value measurement of assets [line items]    
Total assets 6,105  
Property, plant and equipment | Non-recurring fair value measurement | Quoted prices in active markets for identical assets (Level 1)    
Disclosure of fair value measurement of assets [line items]    
Total assets 0  
Property, plant and equipment | Non-recurring fair value measurement | Significant other observable inputs (Level 2)    
Disclosure of fair value measurement of assets [line items]    
Total assets 0  
Property, plant and equipment | Non-recurring fair value measurement | Significant unobservable inputs (Level 3)    
Disclosure of fair value measurement of assets [line items]    
Total assets 6,105  
Intangible assets | Non-recurring fair value measurement    
Disclosure of fair value measurement of assets [line items]    
Total assets 34  
Impairment loss 12  
Intangible assets | Non-recurring fair value measurement | Quoted prices in active markets for identical assets (Level 1)    
Disclosure of fair value measurement of assets [line items]    
Total assets 0  
Intangible assets | Non-recurring fair value measurement | Significant other observable inputs (Level 2)    
Disclosure of fair value measurement of assets [line items]    
Total assets 0  
Intangible assets | Non-recurring fair value measurement | Significant unobservable inputs (Level 3)    
Disclosure of fair value measurement of assets [line items]    
Total assets $ 34