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Investments (Tables) | 12 Months Ended
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Dec. 31, 2017
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 (see Note 4 for a discussion of fair value of the trust investments):
| Longest Maturity Date |  | Amortized Cost |  | Fair Value
|  | December 31,
(in millions) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Stocks | — |  | $ | 236 |  |  | $ | 319 |  |  | $ | 1,596 |  |  | $ | 1,547 |
Municipal bonds | 2054 |  | 643 |  |  | 659 |  |  | 768 |  |  | 766 |
U.S. government and agency securities | 2067 |  | 1,235 |  |  | 1,131 |  |  | 1,319 |  |  | 1,191 |
Corporate bonds | 2057 |  | 579 |  |  | 600 |  |  | 643 |  |  | 659 |
Short-term investments and receivables/payables 1 | One-year |  | 110 |  |  | 75 |  |  | 114 |  |  | 79 |
Total |  |  | $ | 2,803 |  |  | $ | 2,784 |  |  | $ | 4,440 |  |  | $ | 4,242 |
1 | Short-term investments include $29 million and $114 million of repurchase agreements payable by financial institutions which earn interest, are fully secured by U.S. Treasury securities and mature by January 2, 2018 and January 4, 2017 as of December 31, 2017 and 2016, respectively.

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