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Regulatory Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2020
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, | 2020 |  | 2019 |  | Recovery/Refund Period
Regulatory assets |  |  |
Current regulatory assets: |  |  |  |  |
El Salvador energy pass through costs recovery | $ | 40 |  |  | $ | 56 |  |  | Quarterly
Other | 73 |  |  | 57 |  |  | 1 year
Total current regulatory assets | 113 |  |  | 113 |  |  |
Noncurrent regulatory assets: |  |  |  |  |
IPL and DPL defined benefit pension obligations (1) | 244 |  |  | 262 |  |  | Various
IPL environmental costs | 81 |  |  | 85 |  |  | Various
IPL Petersburg Unit 1 retirement costs | 75 |  |  | — |  |  | Over life of assets
IPL deferred Midwest ISO costs | 61 |  |  | 75 |  |  | 6 years
Other | 126 |  |  | 108 |  |  | Various
Total noncurrent regulatory assets | 587 |  |  | 530 |  |  |
Total regulatory assets | $ | 700 |  |  | $ | 643 |  |  |
Regulatory liabilities |  |  |  |  |
Current regulatory liabilities: |  |  |  |  |
Overcollection of costs to be passed back to customers | $ | 47 |  |  | $ | 80 |  |  | 1 year
Other | 1 |  |  | 1 |  |  | Various
Total current regulatory liabilities | 48 |  |  | 81 |  |  |
Noncurrent regulatory liabilities: |  |  |  |  |
IPL and DPL accrued costs of removal and AROs | 863 |  |  | 863 |  |  | Over life of assets
IPL and DPL income taxes payable to customers through rates | 174 |  |  | 209 |  |  | Various
Other | 21 |  |  | 18 |  |  | Various
Total noncurrent regulatory liabilities | 1,058 |  |  | 1,090 |  |  |
Total regulatory liabilities | $ | 1,106 |  |  | $ | 1,171 |  |  |
_____________________________ (1)Past expenditures on which the Company earns a rate of return.

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