Consolidated Statements of Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Net trade sales	$ 23	$ 26
Net sales to related companies	1,523	1,632
Total Net Sales	1,546	1,658
Cost of sales	1,227	1,525
Research and development expenses	5	6
Selling, general and administrative expenses	2	2
Equity in earnings of nonconsolidated affiliates	1	0
Sundry income (expense) - net	(14)	(9)
Interest income	2	3
Interest expense and amortization of debt discount	8	7
Income Before Income Taxes	293	112
Provision for income taxes	98	37
Net Income Attributable to Union Carbide Corporation	195	75
Depreciation	39	44
Capital Expenditures	$ 50	$ 25