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Regulatory Matters (Tables)
9 Months Ended
Sep. 30, 2013
Regulated Operations [Abstract]  
Regulatory assets and liabilities
The following table summarizes our regulatory asset and liability balances (in millions):
 
September 30, 2013
 
December 31, 2012
Current regulatory assets
$
8

 
$
6

Non-current regulatory assets(1)
12

 
14

Total Regulatory Assets
$
20

 
$
20

 
 
 
 
Current regulatory liabilities
$
3

 
$
9

Non-current regulatory liabilities(2)
10

 
10

Total Regulatory Liabilities
$
13

 
$
19

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(1) Included in "Deferred charges and other assets" on our accompanying Consolidated Balance Sheets.
(2) Included in "Other long-term liabilities and deferred credits" on our accompanying Consolidated Balance Sheets.