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Regulatory Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2017
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, | 2017 |  | 2016 |  | Recovery/Refund Period
REGULATORY ASSETS |  |  |
Current regulatory assets: |  |  |  |  |
El Salvador tariff recoveries | $ | 59 |  |  | $ | 54 |  |  | Quarterly as part of the tariff adjustment
Other | 60 |  |  | 34 |  |  | Various
Total current regulatory assets | 119 |  |  | 88 |  |  |
Noncurrent regulatory assets: |  |  |  |  |
IPL and DPL defined benefit pension obligations (1) | 298 |  |  | 316 |  |  | Various
IPL and DPL income taxes recoverable from customers (1) | — |  |  | 87 |  |  | Various
IPL deferred Midwest ISO costs | 102 |  |  | 114 |  |  | 9 years
IPL environmental costs | 48 |  |  | 41 |  |  | Various
Other | 94 |  |  | 97 |  |  | Various
Total noncurrent regulatory assets | 542 |  |  | 655 |  |  |
TOTAL REGULATORY ASSETS | $ | 661 |  |  | $ | 743 |  |  |
REGULATORY LIABILITIES |  |  |  |  |
Current regulatory liabilities: |  |  |  |  |
DPL efficiency program costs | $ | 10 |  |  | $ | 14 |  |  | Annually as part of the tariff adjustment
Other | 7 |  |  | 27 |  |  | Various
Total current regulatory liabilities | 17 |  |  | 41 |  |  |
Noncurrent regulatory liabilities: |  |  |  |  |
IPL and DPL asset retirement obligations | 830 |  |  | 795 |  |  | Over life of assets
IPL and DPL deferred income taxes | 243 |  |  | 2 |  |  | Various
Other | 6 |  |  | 5 |  |  | Various
Total noncurrent regulatory liabilities | 1,079 |  |  | 802 |  |  |
TOTAL REGULATORY LIABILITIES | $ | 1,096 |  |  | $ | 843 |  |  |
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(1) | Past expenditures on which the Company earns a rate of return.
Schedule of Regulatory Assets by Region | The following table summarizes regulatory assets and liabilities by reportable segment in millions as of the periods indicated:
| December 31, 2017 |  | December 31, 2016
| Regulatory Assets |  | Regulatory Liabilities |  | Regulatory Assets |  | Regulatory Liabilities
US SBU | $ | 602 |  |  | $ | 1,095 |  |  | $ | 689 |  |  | $ | 842 |
MCAC SBU | 59 |  |  | — |  |  | 54 |  |  | — |
Brazil SBU | — |  |  | 1 |  |  | — |  |  | 1 |
Total | $ | 661 |  |  | $ | 1,096 |  |  | $ | 743 |  |  | $ | 843 |

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- Definition Tabular disclosure of assets that are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44264-110382 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 715 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501251&loc=d3e52485-110419 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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