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Supplemental Balance Sheet Information (Tables)
 9 Months Ended
Sep. 30, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Inventories
Total inventories consisted of the following:
(millions)
September 30, 2013
 
December 31, 2012
Finished goods and work in progress
$
266

 
$
245

Raw materials
61

 
59

Total
$
327

 
$
304
Asset Retirement Obligations
Changes in the liability for asset retirement obligations consisted of the following:
 
 
 
 
 
Nine months ended September 30,
(millions)
2013
 
2012
Balance as of January 1
$
139

 
$
114

Accretion expense
5

 
5

Liabilities incurred
2

 
—

Changes in estimated cash flows
(11
)
 
(1
)
Liabilities settled
(1
)
 
(1
)
Foreign currency translation
(2
)
 
1

Balance as of September 30
$
132

 
$
118