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Investments (Tables) | 12 Months Ended
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Dec. 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 Date |  | Amortized Cost |  | Fair Value
|  | December 31,
(in millions) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Stocks | — |  | N/A |  | N/A |  | $ | 1,908 |  |  | $ | 1,765 |
Municipal bonds | 2057 |  | 1,013 |  |  | 822 |  |  | 1,218 |  |  | 970 |
U.S. government and agency securities | 2067 |  | 740 |  |  | 996 |  |  | 864 |  |  | 1,115 |
Corporate bonds | 2070 |  | 460 |  |  | 597 |  |  | 550 |  |  | 679 |
Short-term investments and receivables/payables 1 | One-year |  | 281 |  |  | 32 |  |  | 293 |  |  | 33 |
Total |  |  | $ | 2,494 |  |  | $ | 2,447 |  |  | $ | 4,833 |  |  | $ | 4,562 |
1 Short-term investments include $138 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 January 4, 2021 and January 2, 2020 as of December 31, 2020 and 2019, respectively.
Gains and (Losses) for Equity Securities | The following table summarizes the gains and losses for the trust investments:
| December 31,
(in millions) | 2020 | 2019 | 2018
Gross realized gains | $ | 255 |  | $ | 87 |  | $ | 134 |
Gross realized losses | (6) |  | (2) |  | (27) |
Net unrealized gains (losses) for equity securities | 176 |  | 343 |  | (233) |
Net Unrealized Gains and Losses for Equity Securities | The following table summarizes the gains and losses for the trust investments:
| December 31,
(in millions) | 2020 | 2019 | 2018
Gross realized gains | $ | 255 |  | $ | 87 |  | $ | 134 |
Gross realized losses | (6) |  | (2) |  | (27) |
Net unrealized gains (losses) for equity securities | 176 |  | 343 |  | (233) |

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