Supplemental Balance Sheet Information

3 Months Ended

Mar. 31, 2012

Supplemental Balance Sheet Information [Abstract]

Supplemental Balance Sheet Information

13.     Supplemental Balance Sheet Information

INVENTORIES

Total inventories consisted of the following:

(millions)	As of March 31, 2012		As of December 31, 2011
Finished goods and work in progress		$    253		$    239
Raw materials		60		66
Total		$    313		$    305

ASSET RETIREMENT OBLIGATIONS

Changes in the liability for asset retirement obligations consisted of the following:

		$000,000,000,00		$000,000,000,00
	Three Months               ended March 31,
(millions)	2012		2011
Balance as of January 1		$    114		$    103
Accretion expense		2		2
Liabilities incurred/adjusted		(1)		-
Liabilities settled		-		-
Balance as of March 31		$    115		$    105

As of December 31, 2011, we had $6 million of net property, plant and equipment included in other current assets on the condensed consolidated balance sheet classified as “assets held for sale.” These assets are primarily owned by United States Gypsum Company. There were no amounts classified as assets held for sale as of March 31, 2012.