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Investments (Tables) | 12 Months Ended
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Dec. 31, 2016
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) |  | 2016 |  | 2015 |  | 2016 |  | 2015
Stocks | — |  | $ | 319 |  |  | $ | 304 |  |  | $ | 1,547 |  |  | $ | 1,460 |
Municipal bonds | 2054 |  | 659 |  |  | 691 |  |  | 766 |  |  | 840 |
U.S. government and agency securities | 2055 |  | 1,131 |  |  | 1,070 |  |  | 1,191 |  |  | 1,128 |
Corporate bonds | 2057 |  | 600 |  |  | 708 |  |  | 659 |  |  | 755 |
Short-term investments and receivables/payables 1 | One-year |  | 75 |  |  | 144 |  |  | 79 |  |  | 148 |
Total |  |  | $ | 2,784 |  |  | $ | 2,917 |  |  | $ | 4,242 |  |  | $ | 4,331 |
1 | Short-term investments include $114 million and $81 million of repurchase agreements payable by financial institutions which earn interest, are fully secured by U.S. Treasury securities and mature by January 4, 2017 and January 5, 2016 as of December 31, 2016 and 2015, 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:
| Years ended December 31,
(in millions) | 2016 |  | 2015 |  | 2014
Balance at beginning of period | $ | 4,331 |  |  | $ | 4,799 |  |  | $ | 4,494 |
Gross realized gains | 92 |  |  | 326 |  |  | 197 |
Gross realized losses | (19 | ) |  | (26 | ) |  | (5 | )
Unrealized gains (losses) | 44 |  |  | (364 | ) |  | 75 |
Other-than-temporary impairments | (36 | ) |  | (29 | ) |  | (14 | )
Interest, dividends and other | 116 |  |  | 115 |  |  | 118 |
Contributions | — |  |  | 54 |  |  | 5 |
Income taxes | (58 | ) |  | (64 | ) |  | (62 | )
Decommissioning disbursements | (224 | ) |  | (471 | ) |  | (4 | )
Administrative expenses and other | (4 | ) |  | (9 | ) |  | (5 | )
Balance at end of period | $ | 4,242 |  |  | $ | 4,331 |  |  | $ | 4,799 |

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