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Other Investments (Tables) | 12 Months Ended
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Dec. 31, 2013
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) |  |  | 2013 |  | 2012 |  | 2013 |  | 2012
Stocks | — |  | $ | 656 |  |  | $ | 978 |  |  | $ | 2,208 |  |  | $ | 2,271 |
Municipal bonds | 2051 |  | 675 |  |  | 518 |  |  | 756 |  |  | 644 |
U.S. government and agency securities | 2044 |  | 902 |  |  | 547 |  |  | 947 |  |  | 603 |
Corporate bonds | 2054 |  | 208 |  |  | 324 |  |  | 241 |  |  | 410 |
Short-term investments and receivables/payables | One-year |  | 329 |  |  | 116 |  |  | 342 |  |  | 120 |
Total |  |  | $ | 2,770 |  |  | $ | 2,483 |  |  | $ | 4,494 |  |  | $ | 4,048 |
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) | 2013 |  | 2012 |  | 2011
Balance at beginning of period | $ | 4,048 |  |  | $ | 3,592 |  |  | $ | 3,480 |
Gross realized gains | 300 |  |  | 73 |  |  | 108 |
Gross realized losses | (32 | ) |  | (5 | ) |  | (17 | )
Unrealized gains (losses), net | 160 |  |  | 276 |  |  | (7 | )
Other-than-temporary impairments | (47 | ) |  | (36 | ) |  | (47 | )
Interest, dividends, contributions and other | 65 |  |  | 148 |  |  | 75 |
Balance at end of period | $ | 4,494 |  |  | $ | 4,048 |  |  | $ | 3,592 |

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