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Supplemental Balance Sheet Information (Tables)
 6 Months Ended
Jun. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
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.