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Regulatory Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2018
Regulated Operations [Abstract] |
Regulatory Assets and Liabilities | The Company has recorded regulatory assets and liabilities (in millions) that it expects to pass through to its customers in accordance with, and subject to, regulatory provisions as follows:
December 31, | 2018 |  | 2017 |  | Recovery/Refund Period
REGULATORY ASSETS |  |  |
Current regulatory assets: |  |  |  |  |
El Salvador energy pass through costs recovery | $ | 87 |  |  | $ | 59 |  |  | Quarterly
Other | 69 |  |  | 60 |  |  | Various
Total current regulatory assets | 156 |  |  | 119 |  |  |
Noncurrent regulatory assets: |  |  |  |  |
IPL and DPL defined benefit pension obligations (1) | 283 |  |  | 298 |  |  | Various
IPL deferred Midwest ISO costs | 88 |  |  | 102 |  |  | 8 years
IPL environmental costs | 89 |  |  | 48 |  |  | Various
Other | 87 |  |  | 94 |  |  | Various
Total noncurrent regulatory assets | 547 |  |  | 542 |  |  |
TOTAL REGULATORY ASSETS | $ | 703 |  |  | $ | 661 |  |  |
REGULATORY LIABILITIES |  |  |  |  |
Current regulatory liabilities: |  |  |  |  |
Overcollection of costs to be passed back to customers | $ | 83 |  |  | $ | 14 |  |  | 1 year
Other | 3 |  |  | 3 |  |  | Various
Total current regulatory liabilities | 86 |  |  | 17 |  |  |
Noncurrent regulatory liabilities: |  |  |  |  |
IPL and DPL accrued costs of removal and ARO's | 847 |  |  | 830 |  |  | Over life of assets
IPL and DPL income taxes payable to customers through rates | 246 |  |  | 243 |  |  | Various
Other | 53 |  |  | 6 |  |  | Various
Total noncurrent regulatory liabilities | 1,146 |  |  | 1,079 |  |  |
TOTAL REGULATORY LIABILITIES | $ | 1,232 |  |  | $ | 1,096 |  |  |
_____________________________ (1) Past expenditures on which the Company earns a rate of return.

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