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Other Investments (Tables) | 12 Months Ended
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Dec. 31, 2012
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 |  | Amortized Cost |  | Fair Value
|  | December 31,
(in millions) | Dates |  | 2012 |  | 2011 |  | 2012 |  | 2011
Stocks | — |  | $ | 978 |  |  | $ | 865 |  |  | $ | 2,271 |  |  | $ | 1,899 |
Municipal bonds | 2054 |  | 518 |  |  | 625 |  |  | 644 |  |  | 756 |
U.S. government and agency securities | 2043 |  | 547 |  |  | 516 |  |  | 603 |  |  | 580 |
Corporate bonds | 2054 |  | 324 |  |  | 259 |  |  | 410 |  |  | 317 |
Short-term investments and receivables/payables | One-year |  | 116 |  |  | 38 |  |  | 120 |  |  | 40 |
Total |  |  | $ | 2,483 |  |  | $ | 2,303 |  |  | $ | 4,048 |  |  | $ | 3,592 |
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) | 2012 |  | 2011 |  | 2010
Balance at beginning of period | $ | 3,592 |  |  | $ | 3,480 |  |  | $ | 3,140 |
Gross realized gains | 73 |  |  | 108 |  |  | 125 |
Gross realized losses | (5 | ) |  | (17 | ) |  | (4 | )
Unrealized gains (losses), net | 276 |  |  | (7 | ) |  | 148 |
Other-than-temporary impairments | (36 | ) |  | (47 | ) |  | (27 | )
Interest, dividends, contributions and other | 148 |  |  | 75 |  |  | 98 |
Balance at end of period | $ | 4,048 |  |  | $ | 3,592 |  |  | $ | 3,480 |

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