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VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income tax valuation allowance, deducted from deferred tax assets      
Balance at Beginning of Period $ 10    
Balance at End of Period   $ 10  
Allowance for doubtful accounts, deducted from accounts receivable      
Income tax valuation allowance, deducted from deferred tax assets      
Balance at Beginning of Period 29 21 $ 21
Charged to Costs and Expenses 56 47 62
Charged to Other Accounts 0 0 0
Deductions (57) (39) (62)
Balance at End of Period 28 29 21
Income tax valuation allowance, deducted from deferred tax assets      
Income tax valuation allowance, deducted from deferred tax assets      
Balance at Beginning of Period 4,116 3,575 265
Charged to Costs and Expenses (151) 306 3,039
Charged to Other Accounts (15) 235 271
Deductions (2,087) 0 0
Balance at End of Period 1,863 4,116 3,575
Income tax valuation allowance, deducted from deferred tax assets | Discontinued Operations      
Income tax valuation allowance, deducted from deferred tax assets      
Balance at Beginning of Period $ 2,087 2,194  
Balance at End of Period   $ 2,087 $ 2,194