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Summary of Significant Accounting Policies (Cash) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012
Cash and Cash Equivalents Items [Line Items] |  |  |
Maximum maturity period of cash equivalent investments (in months) | 3 months |  |
Money market funds | $ 58 | $ 107 | $ 107
Cash reclassified to accounts payable | 165 |  | 247
Southern California Edison |  |  |
Cash and Cash Equivalents Items [Line Items] |  |  |
Money market funds | 5 |  | 5
Cash reclassified to accounts payable | $ 165 |  | $ 242

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- Definition This element represents the amount of cash which is reclassified as accounts payable under the cash management program. + References No definition available. + Details
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- Definition This element represents the maximum maturity period of the investments considered as cash equivalents. + References No definition available. + Details
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- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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- Details
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