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ACCOUNTS RECEIVABLE - NET (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]    
Trade $ 6,874 $ 7,029
Less - Allowance for doubtful accounts (199) (202)
Accounts receivable, Net 6,675 6,827
Accounts Notes And Other Receivables Paragraph Details [Abstract]    
Unbilled contracts receivable $ 1,750 $ 1,589