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Investments (Tables) - Southern California Edison | 6 Months Ended
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Jun. 30, 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) |  | June 30, 2017 |  | December 31, 2016 |  | June 30, 2017 |  | December 31, 2016
Stocks | — |  | $ | 304 |  |  | $ | 319 |  |  | $ | 1,611 |  |  | $ | 1,547 |
Municipal bonds | 2054 |  | 617 |  |  | 659 |  |  | 737 |  |  | 766 |
U.S. government and agency securities | 2067 |  | 1,209 |  |  | 1,131 |  |  | 1,288 |  |  | 1,191 |
Corporate bonds | 2057 |  | 523 |  |  | 600 |  |  | 584 |  |  | 659 |
Short-term investments and receivables/payables 1 | One-year |  | 156 |  |  | 75 |  |  | 161 |  |  | 79 |
Total |  |  | $ | 2,809 |  |  | $ | 2,784 |  |  | $ | 4,381 |  |  | $ | 4,242 |
1 | Short-term investments include $32 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 July 3, 2017 and J anuary 4, 2017 as of June 30, 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 June 30, |  | Six months ended June 30,
(in millions) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Balance at beginning of period |  | $ | 4,352 |  |  | $ | 4,290 |  |  | $ | 4,242 |  |  | $ | 4,331 |
Gross realized gains |  | 13 |  |  | 22 |  |  | 112 |  |  | 75 |
Gross realized losses |  | — |  |  | (1 | ) |  | (16 | ) |  | (4 | )
Unrealized gains, net of losses |  | 87 |  |  | 72 |  |  | 114 |  |  | 113 |
Other-than-temporary impairments |  | (3 | ) |  | (8 | ) |  | (4 | ) |  | (33 | )
Interest and dividends |  | 31 |  |  | 32 |  |  | 59 |  |  | 60 |
Income taxes |  | (26 | ) |  | (24 | ) |  | (26 | ) |  | (42 | )
Decommissioning disbursements |  | (73 | ) |  | (38 | ) |  | (99 | ) |  | (154 | )
Administrative expenses and other |  | — |  |  | (1 | ) |  | (1 | ) |  | (2 | )
Balance at end of period |  | $ | 4,381 |  |  | $ | 4,344 |  |  | $ | 4,381 |  |  | $ | 4,344 |

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