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Investments (Tables) | 12 Months Ended
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Dec. 31, 2018
Regulated Entity, Other Assets, Noncurrent [Abstract] |
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 Date |  | Amortized Cost |  | Fair Value
|  | December 31,
(in millions) |  | 2018 |  | 2017 |  | 2018 |  | 2017
Stocks | — |  | * |  |  | $ | 236 |  |  | $ | 1,381 |  |  | $ | 1,596 |
Municipal bonds | 2057 |  | 665 |  |  | 643 |  |  | 767 |  |  | 768 |
U.S. government and agency securities | 2067 |  | 1,193 |  |  | 1,235 |  |  | 1,288 |  |  | 1,319 |
Corporate bonds | 2050 |  | 573 |  |  | 579 |  |  | 611 |  |  | 643 |
Short-term investments and receivables/payables 1 | One-year |  | 70 |  |  | 110 |  |  | 73 |  |  | 114 |
Total |  |  | $ | 2,501 |  |  | $ | 2,803 |  |  | $ | 4,120 |  |  | $ | 4,440 |
* Effective January 1, 2018, SCE adopted an accounting standards update related to the classification and measurement of financial instruments in which equity investments are measured at fair value. See Note 1 for further information.
1 | Short-term investments include $71 million and $29 million of repurchase agreements payable by financial institutions which earn interest, are fully secured by U.S. Treasury securities and mature by January 2, 2019 and January 2, 2018 as of December 31, 2018 and 2017, respectively.
Gains and (Losses) for Equity Securities | The following table summarizes the gains and (losses) for the trust investments:
| December 31,
(in millions) | 2018 | 2017 | 2016
Gross realized gains | $ | 134 |  | $ | 244 |  | $ | 92 |
Gross realized losses | (27 | ) | (23 | ) | (19 | )
Net unrealized (losses) gains for equity securities | (233 | ) | 142 |  | 75 |
Net Unrealized Gains and Losses for Equity Securities | The following table summarizes the gains and (losses) for the trust investments:
| December 31,
(in millions) | 2018 | 2017 | 2016
Gross realized gains | $ | 134 |  | $ | 244 |  | $ | 92 |
Gross realized losses | (27 | ) | (23 | ) | (19 | )
Net unrealized (losses) gains for equity securities | (233 | ) | 142 |  | 75 |

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