QUARTERLY INFORMATION (UNAUDITED) Quarterly Information (Unaudited) (Notes)	12 Months Ended
	Dec. 31, 2012
Quarterly Financial Data [Abstract]
Quarterly Financial Information [Text Block]	QUARTERLY INFORMATION (UNAUDITED) During the fourth quarter of 2012, the Corporation recorded a cumulative out-of-period adjustment relating to sales from the Corporation to Dow. The adjustment decreased "Total Net Sales" and "Income (Loss) Before Income Taxes" by $2 million, and "Net Income (Loss) Attributable to Union Carbide Corporation" by $1 million in the fourth quarter of 2012. Had the amounts pertaining to the first, second and third quarters of 2012 been reflected in those periods, "Total Net Sales" and "Income (Loss) Before Income Taxes" would have increased (decreased) by $(47) million, $34 million, and $(7) million, respectively, resulting in an increase (decrease) to "Net Income (Loss) Attributable to Union Carbide Corporation" of $(31) million, $22 million and $(5) million, respectively. "Total Net Sales" for 2012 included $43 million that related to prior years. Management believes the correcting adjustment was not material to the Corporation's full year results for 2012 or to the previously reported financial information for any prior fiscal year or interim period.

The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished.

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