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Investments (Tables) | 9 Months Ended
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Sep. 30, 2019
Investment [Line Items] |
Gains and (Losses) for Equity Securities | The following table summarizes the gains and (losses) for the trust investments:
| Three months ended September 30, |  | Nine months ended September 30,
(in millions) | 2019 |  | 2018 |  | 2019 |  | 2018
Gross realized gains | $ | 19 |  |  | $ | 28 |  |  | $ | 64 |  |  | $ | 115 |
Gross realized loss | (1 | ) |  | (7 | ) |  | (1 | ) |  | (17 | )
Net unrealized gains for equity securities | 3 |  |  | 72 |  |  | 209 |  |  | 4 |
Southern California Edison |
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, 2019 |  | December 31, 2018 |  | September 30, 2019 |  | December 31, 2018
Stocks | — |  | * |  |  | * |  |  | $ | 1,619 |  |  | $ | 1,381 |
Municipal bonds | 2057 |  | $ | 692 |  |  | $ | 665 |  |  | 847 |  |  | 767 |
U.S. government and agency securities | 2067 |  | 1,113 |  |  | 1,193 |  |  | 1,272 |  |  | 1,288 |
Corporate bonds | 2068 |  | 640 |  |  | 573 |  |  | 721 |  |  | 611 |
Short-term investments and receivables/payables 1 | One-year |  | 19 |  |  | 70 |  |  | 20 |  |  | 73 |
Total |  |  | $ | 2,464 |  |  | $ | 2,501 |  |  | $ | 4,479 |  |  | $ | 4,120 |
* | Equity investments are measured at fair value.
1 | Short-term investments include $36 million and $71 million of repurchase agreements payable by financial institutions which earn interest, are fully secured by U.S. Treasury securities and mature by October 1, 2019 and January 2, 2019 as of September 30, 2019 and December 31, 2018, respectively.

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