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Regulatory Matters | 3 Months Ended
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Mar. 31, 2013
Regulated Operations [Abstract] |
Regulatory Matters | Regulatory Matters and Accounting for Regulatory Activities Regulatory Assets and Liabilities Regulatory assets and liabilities represent probable future revenues or expenses associated with certain charges and credits that will be recovered from or refunded to customers through the ratemaking process. We included the amounts of our regulatory assets and liabilities within “Other current assets,” “Deferred charges and other assets,” “Accrued other current liabilities,” and “Other long-term liabilities and deferred credits” respectively, in our accompanying consolidated balance sheets. The recovery period for these regulatory assets is approximately one year to forty-three years. The following table summarizes our regulatory asset and liability balances (in millions):
| March 31, 2013 |  | December 31, 2012
Current regulatory assets | $ | 73 |  |  | $ | 62 |
Non-current regulatory assets | 393 |  |  | 402 |
Total Regulatory Assets | $ | 466 |  |  | $ | 464 |
Current regulatory liabilities | $ | 7 |  |  | $ | 7 |
Non-current regulatory liabilities | 104 |  |  | 113 |
Total Regulatory Liabilities | $ | 111 |  |  | $ | 120 |
More information about our regulatory matters can be found in Note 17 “Regulatory Matters” to our consolidated financial statements that were included in our 2012 Form 10-K.

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- Definition The entire disclosure for public utilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 71 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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