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Restructuring Charges (Tables)
 9 Months Ended
Sep. 30, 2013
Restructuring and Related Activities [Abstract]  
Restructuring charges
We recorded the following restructuring and long-lived asset impairment charges during the three and nine months ended September 30, 2013 and 2012:
 
Three months ended September 30,
 
Nine months ended September 30,
 
 
(millions)
2013
 
2012
 
2013
 
2012
Severance
$
—

 
$
2

 
$
3

 
$
3

Lease obligations
(1
)
 
—

 
(1
)
 
(1
)
Long-lived asset impairment
—

 
—

 
—

 
1

Other exit costs
1

 
1

 
1

 
2

Total
$
—

 
$
3

 
$
3

 
$
5
Restructuring reserves
The restructuring reserve is summarized as follows:
 
Balance
as of
12/31/12
 
2013 Activity
 
Balance
as of 9/30/13
(millions)
 
Charges
 
Cash Payments
 
Severance
$
5

 
$
3

 
$
(7
)
 
$
1

Lease obligations
15

 
(1
)
 
(3
)
 
11

Other exit costs
—

 
1

 
(1
)
 
—

Total
$
20

 
$
3

 
$
(11
)
 
$
12