Supplemental Balance Sheet Information

INVENTORIES

Total inventories consisted of the following:



(millions)	June 30, 2014		December 31, 2013
Finished goods and work in progress	$	276	$	270
Raw materials	61		62
Total	$	337	$	332

ASSET RETIREMENT OBLIGATIONS

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



	Six months ended June 30,
(millions)	2014			2013
Balance as of January 1	$	132		$	139
Accretion expense	4			4
Changes in estimated cash flows (a)	(10		)	—
Liabilities settled	(2		)	—
Foreign currency translation	(1		)	(2		)
Balance as of June 30	$	123		$	141

(a) Changes in estimated cash flows for the six months ended June 30, 2014 consists of changes in estimates primarily related to reclamation activities for our gypsum quarry and ship loading facility in Windsor, Nova Scotia, Canada, which we permanently closed during the third quarter of 2011, and our mining operation in Little Narrows, Nova Scotia, Canada.

ACCRUED INTEREST

Interest accrued on our debt as of June 30, 2014 and December 31, 2013 was $47 million and $48 million, respectively, and is included in accrued expenses on our consolidated balance sheets.

ASSETS HELD FOR SALE

In June 2014, we sold surplus property for a gain of $12 million which is included in cost of goods sold in our statement of operations. The asset was classified as held for sale in our consolidated balance sheet at December 31, 2013 with a carrying value of approximately zero. Assets held for sale as of June 30, 2014 include approximately $5 million of indefinite-lived intangible assets which are classified as other current assets in our accompanying consolidated balance sheet.