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Regulatory Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2016
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, | 2016 |  | 2015 |  | Recovery/Refund Period
REGULATORY ASSETS |  |  |
Current regulatory assets: |  |  |  |  |
Brazil tariff recoveries: (1) |  |  |  |  |
Energy purchases/sales | $ | 319 |  |  | $ | 349 |  |  | Annually as part of the tariff adjustment
Transmission costs, regulatory fees and other | 139 |  |  | 212 |  |  | Annually as part of the tariff adjustment
El Salvador tariff recoveries (1) | 54 |  |  | 43 |  |  | Quarterly as part of the tariff adjustment
Other | 34 |  |  | 23 |  |  | Various
Total current regulatory assets | 546 |  |  | 627 |  |  |
Noncurrent regulatory assets: |  |  |  |  |
IPL and DPL defined benefit pension obligations | 316 |  |  | 227 |  |  | Various
DPL and IPL income taxes recoverable from customers | 87 |  |  | 36 |  |  | Various
Brazil tariff recoveries: (1) |  |  |  |  |
Energy purchases/sales | 63 |  |  | 132 |  |  | Annually as part of the tariff adjustment
Transmission costs, regulatory fees and other | 18 |  |  | 124 |  |  | Annually as part of the tariff adjustment
IPL deferred Midwest ISO costs (1) | 114 |  |  | 129 |  |  | 10 years
Other | 143 |  |  | 239 |  |  | Various
Total noncurrent regulatory assets | 741 |  |  | 887 |  |  |
TOTAL REGULATORY ASSETS | $ | 1,287 |  |  | $ | 1,514 |  |  |
REGULATORY LIABILITIES |  |  |  |  |
Current regulatory liabilities: |  |  |  |  |
Brazil efficiency program costs | $ | 36 |  |  | $ | 9 |  |  | Annually as part of the tariff adjustment
Brazil tariff refunds: |  |  |  |  |
Energy purchases/sales | 211 |  |  | 105 |  |  | Annually as part of the tariff adjustment
Transmission costs, regulatory fees and other | 249 |  |  | 235 |  |  | Annually as part of the tariff adjustment
Other | 42 |  |  | 59 |  |  | Various
Total current regulatory liabilities | 538 |  |  | 408 |  |  |
Noncurrent regulatory liabilities: |  |  |  |  |
IPL and DPL asset retirement obligations | 795 |  |  | 759 |  |  | Over life of assets
Brazil special obligations | 362 |  |  | 313 |  |  | To be determined
Brazil efficiency program costs | 24 |  |  | 14 |  |  | Annually as part of the tariff adjustment
Brazil tariff refunds: |  |  |  |  |
Energy purchases/sales | 7 |  |  | 30 |  |  | Annually as part of the tariff adjustment
Transmission costs, regulatory fees and other | 170 |  |  | 86 |  |  | Annually as part of the tariff adjustment
Other | 5 |  |  | 7 |  |  | Various
Total noncurrent regulatory liabilities | 1,363 |  |  | 1,209 |  |  |
TOTAL REGULATORY LIABILITIES | $ | 1,901 |  |  | $ | 1,617 |  |  |
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(1) | Past expenditures on which the Company does not earn 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, 2016 |  | December 31, 2015
| Regulatory Assets |  | Regulatory Liabilities |  | Regulatory Assets |  | Regulatory Liabilities
Brazil SBU | $ | 544 |  |  | $ | 1,059 |  |  | $ | 821 |  |  | $ | 798 |
US SBU | 689 |  |  | 842 |  |  | 650 |  |  | 819 |
MCAC SBU | 54 |  |  | — |  |  | 43 |  |  | — |
Total | $ | 1,287 |  |  | $ | 1,901 |  |  | $ | 1,514 |  |  | $ | 1,617 |

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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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