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REGULATORY ASSETS, LIABILITIES, AND BALANCING ACCOUNTS (Tables) | 3 Months Ended
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Mar. 31, 2018
Regulated Operations [Abstract] |
Long-Term Regulatory Assets | Long-term regulatory assets are comprised of the following:
| Asset Balance at
(in millions) | March 31, 2018 |  | December 31, 2017
Pension benefits | $ | 1,915 |  |  | $ | 1,954 |
Environmental compliance costs | 749 |  |  | 837 |
Utility retained generation | 308 |  |  | 319 |
Price risk management | 68 |  |  | 65 |
Unamortized loss, net of gain, on reacquired debt | 88 |  |  | 79 |
Catastrophic event memorandum account | 314 |  |  | 274 |
Other | 282 |  |  | 265 |
Total long-term regulatory assets | $ | 3,724 |  |  | $ | 3,793 |
Long-Term Regulatory Liabilities | Long-term regulatory liabilities are comprised of the following:
| Liability Balance at
(in millions) | March 31, 2018 |  | December 31, 2017
Cost of removal obligations | $ | 5,674 |  |  | $ | 5,547 |
Deferred income taxes | 873 |  |  | 1,021 |
Recoveries in excess of AROs | 533 |  |  | 624 |
Public purpose programs | 591 |  |  | 590 |
Other | 915 |  |  | 897 |
Total long-term regulatory liabilities | $ | 8,586 |  |  | $ | 8,679 |
Regulatory Balancing Accounts Receivable | Current regulatory balancing accounts receivable and payable are comprised of the following:
| Receivable Balance at
(in millions) | March 31, 2018 |  | December 31, 2017
Electric distribution | $ | 176 |  |  | $ | — |
Electric transmission | 125 |  |  | 139 |
Utility generation | 203 |  |  | — |
Gas distribution and transmission | 269 |  |  | 486 |
Energy procurement | 1 |  |  | 71 |
Public purpose programs | 115 |  |  | 103 |
Other | 478 |  |  | 423 |
Total regulatory balancing accounts receivable | $ | 1,367 |  |  | $ | 1,222 |
Regulatory Balancing Accounts Payable |
| Payable Balance at
(in millions) | March 31, 2018 |  | December 31, 2017
Electric distribution | $ | — |  |  | $ | 72 |
Electric transmission | 108 |  |  | 120 |
Utility generation | — |  |  | 14 |
Energy procurement | 265 |  |  | 149 |
Public purpose programs | 491 |  |  | 452 |
Other | 400 |  |  | 313 |
Total regulatory balancing accounts payable | $ | 1,264 |  |  | $ | 1,120 |

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