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Investments (Tables) - Southern California Edison | 9 Months Ended
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Sep. 30, 2016
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) |  | September 30, 2016 |  | December 31, 2015 |  | September 30, 2016 |  | December 31, 2015
Stocks | — |  | $ | 321 |  |  | $ | 304 |  |  | $ | 1,538 |  |  | $ | 1,460 |
Municipal bonds | 2054 |  | 653 |  |  | 691 |  |  | 813 |  |  | 840 |
U.S. government and agency securities | 2055 |  | 1,114 |  |  | 1,070 |  |  | 1,215 |  |  | 1,128 |
Corporate bonds | 2057 |  | 656 |  |  | 708 |  |  | 740 |  |  | 755 |
Short-term investments and receivables/payables1 | One-year |  | 67 |  |  | 144 |  |  | 70 |  |  | 148 |
Total |  |  | $ | 2,811 |  |  | $ | 2,917 |  |  | $ | 4,376 |  |  | $ | 4,331 |
1 | Short-term investments include $81 million of repurchase agreements payable by financial institutions which earn interest, are fully secured by U.S. Treasury securities and matured by January 5, 2016 as of December 31, 2015.
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 September 30, |  | Nine months ended September 30,
(in millions) |  | 2016 |  | 2015 |  | 2016 |  | 2015
Balance at beginning of period |  | $ | 4,344 |  |  | $ | 4,836 |  |  | $ | 4,331 |  |  | $ | 4,799 |
Gross realized gains |  | 18 |  |  | 183 |  |  | 61 |  |  | 215 |
Gross realized losses |  | (1 | ) |  | (10 | ) |  | (5 | ) |  | (15 | )
Unrealized gains (losses), net |  | 32 |  |  | (316 | ) |  | 153 |  |  | (343 | )
Other-than-temporary impairments |  | (2 | ) |  | (10 | ) |  | (10 | ) |  | (22 | )
Interest and dividends |  | 28 |  |  | 28 |  |  | 88 |  |  | 88 |
Contributions |  | — |  |  | — |  |  | — |  |  | 7 |
Income taxes |  | (5 | ) |  | — |  |  | (47 | ) |  | (14 | )
Decommissioning disbursements |  | (38 | ) |  | (319 | ) |  | (192 | ) |  | (319 | )
Administrative expenses and other |  | — |  |  | (4 | ) |  | (3 | ) |  | (8 | )
Balance at end of period |  | $ | 4,376 |  |  | $ | 4,388 |  |  | $ | 4,376 |  |  | $ | 4,388 |

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