XML 43 R30.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Investments (Tables) - Southern California Edison | 3 Months Ended
--- | ---
Mar. 31, 2017
Investment [Line Items] |
Amortized Cost and Fair Value of the Trust Investments | The following table sets forth amortized cost and fair value of the trust investments (see Note 4 for a discussion of fair value of the trust investments):
| Longest Maturity Dates |  | Amortized Cost |  | Fair Value
(in millions) |  | March 31, 2017 |  | December 31, 2016 |  | March 31, 2017 |  | December 31, 2016
Stocks | — |  | $ | 291 |  |  | $ | 319 |  |  | $ | 1,537 |  |  | $ | 1,547 |
Municipal bonds | 2054 |  | 645 |  |  | 659 |  |  | 753 |  |  | 766 |
U.S. government and agency securities | 2055 |  | 1,308 |  |  | 1,131 |  |  | 1,380 |  |  | 1,191 |
Corporate bonds | 2057 |  | 552 |  |  | 600 |  |  | 608 |  |  | 659 |
Short-term investments and receivables/payables 1 | One-year |  | 71 |  |  | 75 |  |  | 74 |  |  | 79 |
Total |  |  | $ | 2,867 |  |  | $ | 2,784 |  |  | $ | 4,352 |  |  | $ | 4,242 |
1 | Short-term investments include $36 million and $114 million of repurchase agreements payable by financial institutions which earn interest, are fully secured by U.S. Treasury securities and mature by April 3, 2017 and J anuary 4, 2017 as of March 31, 2017 and December 31, 2016, respectively.
Summary of Changes in the Fair Value of Trust | The following table sets forth a summary of changes in the fair value of the trust:
|  | Three months ended March 31,
(in millions) |  | 2017 |  | 2016
Balance at beginning of period |  | $ | 4,242 |  |  | $ | 4,331 |
Gross realized gains |  | 99 |  |  | 17 |
Gross realized losses |  | (16 | ) |  | (3 | )
Unrealized gains, net of losses |  | 27 |  |  | 59 |
Other-than-temporary impairments |  | (1 | ) |  | (7 | )
Interest and dividends |  | 28 |  |  | 29 |
Income taxes |  | — |  |  | (18 | )
Decommissioning disbursements |  | (26 | ) |  | (116 | )
Administrative expenses and other |  | (1 | ) |  | (2 | )
Balance at end of period |  | $ | 4,352 |  |  | $ | 4,290 |

X
- Definition Summary of Changes in Fair Value of the Trust [Table Text Block] + References No definition available. + Details
Name: | eix_SummaryOfChangesInFairValueOfTheTrustTableTextBlock
Namespace Prefix: | eix_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | invest_InvestmentLineItems
Namespace Prefix: | invest_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=eix_SouthernCaliforniaEdisonCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |