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ACCOUNTS RECEIVABLE - NET (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]    
Trade $ 7,750 $ 7,705
Less - Allowance for doubtful accounts (167) (197)
Accounts receivable, Net 7,583 7,508
Accounts Notes And Other Receivables Paragraph Details [Abstract]    
Unbilled contracts receivable $ 1,796 $ 1,543