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NET CHANGE IN OPERATING ASSETS AND LIABILITIES (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net change in operating assets and liabilities      
(Increase) decrease in trade accounts receivable $ (33) $ (562) $ (41)
(Increase) decrease in inventories (286) (447) 182
(Increase) decrease in prepaid expenses and other assets (29) (350) (148)
Increase (decrease) in accounts payable and accrued expenses (556) 63 656
Increase (decrease) in accrued taxes 770 (132) (266)
Increase (decrease) in other liabilities (946) (465) (13)
Net change in operating assets and liabilities $ (1,080) $ (1,893) $ 370