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VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for doubtful accounts, deducted from accounts receivable      
Income tax valuation allowance, deducted from deferred tax assets      
Balance at Beginning of Period $ 28 $ 28 $ 21
Charged to Costs and Expenses 83 57 55
Charged to Other Accounts 0 0 0
Deductions (79) (57) (48)
Balance at End of Period 32 28 28
Income tax valuation allowance, deducted from deferred tax assets      
Income tax valuation allowance, deducted from deferred tax assets      
Balance at Beginning of Period 1,863 4,116 3,575
Charged to Costs and Expenses 1,934 (151) 306
Charged to Other Accounts (128) (15) 235
Deductions 125 (2,087) 0
Balance at End of Period $ 3,794 $ 1,863 $ 4,116