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Other Investments (Tables) | 3 Months Ended
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Mar. 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 Dates |  | Amortized Cost |  | Fair Value
(in millions) |  | March 31, 2013 |  | December 31, 2012 |  | March 31, 2013 |  | December 31, 2012
Stocks | — |  | $ | 990 |  |  | $ | 978 |  |  | $ | 2,468 |  |  | $ | 2,271 |
Municipal bonds | 2051 |  | 509 |  |  | 518 |  |  | 631 |  |  | 644 |
U.S. government and agency securities | 2043 |  | 590 |  |  | 547 |  |  | 646 |  |  | 603 |
Corporate bonds | 2054 |  | 327 |  |  | 324 |  |  | 408 |  |  | 410 |
Short-term investments and receivables/payables | One-year |  | 89 |  |  | 116 |  |  | 93 |  |  | 120 |
Total |  |  | $ | 2,505 |  |  | $ | 2,483 |  |  | $ | 4,246 |  |  | $ | 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 trust:
| Three months ended March 31,
(in millions) | 2013 |  | 2012
Balance at beginning of period | $ | 4,048 |  |  | $ | 3,592 |
Gross realized gains | 5 |  |  | 25 |
Gross realized losses | (1 | ) |  | (4 | )
Unrealized gains, net | 176 |  |  | 184 |
Other-than-temporary impairments | (8 | ) |  | (5 | )
Interest, dividends, contributions and other | 26 |  |  | 61 |
Balance at end of period | $ | 4,246 |  |  | $ | 3,853 |

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- Definition Disclosures pertaining to amortized and fair value of the trust investments. + References No definition available. + Details
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- Definition Disclosures pertaining to changes in the fair value of the trust investments. + References No definition available. + Details
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