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Investments (Tables) | 3 Months Ended
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Mar. 31, 2020
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 Dates |  | Amortized Cost |  | Fair Value
(in millions) |  | March 31, 2020 |  | December 31, 2019 |  | March 31, 2020 |  | December 31, 2019
Stocks | — |  | N/A |  |  | N/A |  |  | $ | 1,393 |  |  | $ | 1,765 |
Municipal bonds | 2057 |  | $ | 1,063 |  |  | $ | 822 |  |  | 1,214 |  |  | 970 |
U.S. government and agency securities | 2067 |  | 745 |  |  | 996 |  |  | 928 |  |  | 1,115 |
Corporate bonds | 2068 |  | 575 |  |  | 597 |  |  | 636 |  |  | 679 |
Short-term investments and receivables/payables 1 | One-year |  | 91 |  |  | 32 |  |  | 96 |  |  | 33 |
Total |  |  | $ | 2,474 |  |  | $ | 2,447 |  |  | $ | 4,267 |  |  | $ | 4,562 |
1 | Short-term investments include $56 million and $41 million of repurchase agreements payable by financial institutions which earn interest, are fully secured by U.S. Treasury securities and mature by April 1, 2020 and January 2, 2020 as of March 31, 2020 and December 31, 2019, respectively.
Gains and (Losses) for Equity Securities | The following table summarizes the gains and losses for the trust investments:
| Three months ended March 31,
(in millions) | 2020 |  | 2019
Gross realized gains | $ | 39 |  |  | $ | 23 |
Gross realized loss | 2 |  |  | — |
Net unrealized (losses) gains for equity securities | (376 | ) |  | 168 |

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