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Other Investments (Tables) | 3 Months Ended
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Mar. 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 Dates |  | Amortized Cost |  | Fair Value
(in millions) |  | March 31, 2014 |  | December 31, 2013 |  | March 31, 2014 |  | December 31, 2013
Stocks | — |  | $ | 668 |  |  | $ | 656 |  |  | $ | 2,234 |  |  | $ | 2,208 |
Municipal bonds | 2051 |  | 725 |  |  | 675 |  |  | 838 |  |  | 756 |
U.S. government and agency securities | 2044 |  | 812 |  |  | 902 |  |  | 864 |  |  | 947 |
Corporate bonds | 2054 |  | 253 |  |  | 208 |  |  | 296 |  |  | 241 |
Short-term investments and receivables/payables | One-year |  | 342 |  |  | 329 |  |  | 355 |  |  | 342 |
Total |  |  | $ | 2,800 |  |  | $ | 2,770 |  |  | $ | 4,587 |  |  | $ | 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 trust:
|  | Three months ended March 31,
(in millions) |  | 2014 |  | 2013
Balance at beginning of period |  | $ | 4,494 |  |  | $ | 4,048 |
Gross realized gains |  | 10 |  |  | 5 |
Gross realized losses |  | — |  |  | (1 | )
Unrealized gains, net |  | 62 |  |  | 176 |
Other-than-temporary impairments |  | (3 | ) |  | (8 | )
Interest, dividends, contributions and other |  | 24 |  |  | 26 |
Balance at end of period |  | $ | 4,587 |  |  | $ | 4,246 |

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