v3.10.0.1
DEBT (Details) - USD ($)
Oct. 11, 2018
Sep. 10, 2018
May 01, 2018
Sep. 30, 2018
Dec. 31, 2017
Debt          
Debt instrument unused and available borrowing capacity amount       $ 4,072,000,000  
Maximum borrowing capacity       5,515,000,000  
Carrying Value          
Debt          
Long-term debt, including current portion       5,243,000,000 $ 4,175,000,000
Fair value | Level 2          
Debt          
Long-term debt, including current portion       5,306,000,000 $ 4,337,000,000
Senior Notes | Unsecured Senior Notes due 2024          
Debt          
Aggregate principal amount   $ 600,000,000      
Interest rate   4.35%      
Net proceeds from issuance of debt   $ 594,000,000      
Senior Notes | Senior Notes due 2019          
Debt          
Aggregate principal amount   $ 600,000,000      
Interest rate   8.50%      
Aggregate principal amount redeemed   $ 283,000,000      
Loss on extinguishment of debt   $ 12,000,000      
Senior Notes | Senior Notes due 2019 | Subsequent Event [Member]          
Debt          
Aggregate principal amount redeemed $ 317,000,000        
Loss on extinguishment of debt $ 12,000,000        
Commercial paper program          
Debt          
Commercial paper, outstanding issuances       598,000,000  
Liquidity facility          
Debt          
Credit facility, borrowings outstanding       0  
Revolving credit facility          
Debt          
Credit facility, borrowings outstanding       $ 0  
Current borrowing capacity     $ 700,000,000    
Term     5 years    
Additional borrowing capacity     $ 100,000,000