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REVENUES - Financial Statement Impact of Adopting Revenue from Contracts with Customers (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Balance Sheet    
Accounts receivable and other $ 36 $ 42
Contract assets 7  
ASU 2014-09 | Pro-forma using Legacy U.S. GAAP    
Balance Sheet    
Accounts receivable and other $ 43