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Other Investments (Tables) | 6 Months Ended
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Jun. 30, 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:
|  |  | Amortized Cost |  | Fair Value
(in millions) | Longest Maturity Dates |  | June 30, 2012 |  | December 31, 2011 |  | June 30, 2012 |  | December 31, 2011
Stocks | — |  | $ | 953 |  |  | $ | 865 |  |  | $ | 2,090 |  |  | $ | 1,899 |
Municipal bonds | 2051 |  | 583 |  |  | 625 |  |  | 714 |  |  | 756 |
U.S. government and agency securities | 2041 |  | 489 |  |  | 516 |  |  | 549 |  |  | 580 |
Corporate bonds | 2054 |  | 310 |  |  | 259 |  |  | 382 |  |  | 317 |
Short-term investments and receivables/payables | One-year |  | 71 |  |  | 38 |  |  | 75 |  |  | 40 |
Total |  |  | $ | 2,406 |  |  | $ | 2,303 |  |  | $ | 3,810 |  |  | $ | 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:
| Three months ended June 30, |  | Six months ended June 30,
(in millions) | 2012 |  | 2011 |  | 2012 |  | 2011
Balance at beginning of period | $ | 3,853 |  |  | $ | 3,619 |  |  | $ | 3,592 |  |  | $ | 3,480 |
Gross realized gains | 15 |  |  | 12 |  |  | 40 |  |  | 35 |
Gross realized losses | (1 | ) |  | — |  |  | (5 | ) |  | — |
Unrealized gains (losses) – net | (67 | ) |  | 4 |  |  | 116 |  |  | 106 |
Other-than-temporary impairments | (19 | ) |  | (4 | ) |  | (23 | ) |  | (13 | )
Interest, dividends, contributions and other | 29 |  |  | 26 |  |  | 90 |  |  | 49 |
Balance at end of period | $ | 3,810 |  |  | $ | 3,657 |  |  | $ | 3,810 |  |  | $ | 3,657 |

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