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Other Investments (Tables) | 12 Months Ended
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Dec. 31, 2014
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:
| Longest Maturity Date |  | Amortized Cost |  | Fair Value
|  | December 31,
(in millions) |  | 2014 |  | 2013 |  | 2014 |  | 2013
Stocks | — |  | $ | 524 |  |  | $ | 656 |  |  | $ | 2,031 |  |  | $ | 2,208 |
Municipal bonds | 2054 |  | 681 |  |  | 675 |  |  | 822 |  |  | 756 |
U.S. government and agency securities | 2045 |  | 777 |  |  | 902 |  |  | 836 |  |  | 947 |
Corporate bonds | 2057 |  | 346 |  |  | 208 |  |  | 395 |  |  | 241 |
Short-term investments and receivables/payables | One-year |  | 692 |  |  | 329 |  |  | 715 |  |  | 342 |
Total |  |  | $ | 3,020 |  |  | $ | 2,770 |  |  | $ | 4,799 |  |  | $ | 4,494 |
Summary of Changes in the Fair Value of Trust | The following table sets forth a summary of changes in the fair value of the trusts:
| Years ended December 31,
(in millions) | 2014 |  | 2013 |  | 2012
Balance at beginning of period | $ | 4,494 |  |  | $ | 4,048 |  |  | $ | 3,592 |
Gross realized gains | 197 |  |  | 300 |  |  | 73 |
Gross realized losses | (5 | ) |  | (32 | ) |  | (5 | )
Unrealized gains, net | 75 |  |  | 160 |  |  | 276 |
Other-than-temporary impairments | (14 | ) |  | (47 | ) |  | (36 | )
Interest, dividends and other | 118 |  |  | 113 |  |  | 113 |
Contributions | 5 |  |  | 22 |  |  | 23 |
Income taxes | (62 | ) |  | (66 | ) |  | 17 |
Decommissioning costs | (4 | ) |  | — |  |  | — |
Administrative expenses and other | (5 | ) |  | (4 | ) |  | (5 | )
Balance at end of period | $ | 4,799 |  |  | $ | 4,494 |  |  | $ | 4,048 |

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