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Summary of Significant Accounting Policies (New Accounting Guidance) (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Debt issuance costs | $ 79 |  |
Southern California Edison |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Debt issuance costs | 73 |  |
Accounting Standards Update 2015-03 | Other long-term assets |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Debt issuance costs |  |  | $ (81)
Accounting Standards Update 2015-03 | Long-term debt |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Debt issuance costs |  |  | 81
Accounting Standards Update 2015-03 | Southern California Edison | Other long-term assets |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Debt issuance costs |  |  | (77)
Accounting Standards Update 2015-03 | Southern California Edison | Long-term debt |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Debt issuance costs |  |  | $ 77
Accounting for Share-Based Payments | Pro forma |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Income tax benefit | 18 |  |
Accounting for Share-Based Payments | Southern California Edison | Pro forma |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Income tax benefit | $ 13 |  |
Early adoption | Retained Earnings | Accounting for Share-Based Payments | Forecast |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Increase in beginning retained earnings |  | $ 42 |
Early adoption | Retained Earnings | Accounting for Share-Based Payments | Southern California Edison | Forecast |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Increase in beginning retained earnings |  | $ 6 |

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