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ACCOUNTS, NOTES AND OTHER RECEIVABLES (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Accounts Receivable, Net Current [Abstract]    
Trade $ 7,217 $ 6,940
Other 609 737
Accounts receivable, Gross 7,826 7,677
Less - Allowance for doubtful accounts (241) (248)
Accounts receivable, Net 7,585 7,429
Accounts Notes, And Other Receivables Paragraph Details [Abstract]    
Unbilled contract receivable $ 1,580 $ 1,495