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Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Current Regulatory Assets |  | $ 113 | $ 113
Total Non Current Regulatory Assets |  | $ 587 | 530
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided |  | 6 years |
Total regulatory assets |  | $ 700 | 643
Total Current Regulatory Liabilities |  | $ 48 | 81
Remaining Recovery Period of Regulatory Liabilities |  | 1 year |
Total Non Current Regulatory Liabilities |  | $ 1,058 | 1,090
Total regulatory liabilities |  | 1,106 | 1,171
Overcollection of Costs [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Current Regulatory Liabilities |  | 47 | 80
Deferred Income Tax Charge [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Non Current Regulatory Liabilities |  | 174 | 209
Asset Retirement Obligation Costs |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Non Current Regulatory Liabilities |  | 863 | 863
Other Regulatory Liabilities |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Current Regulatory Liabilities |  | 1 | 1
Total Non Current Regulatory Liabilities |  | 21 | 18
El Salvador Tariff Recoveries |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Current Regulatory Assets |  | 40 | 56
Pension Costs |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Non Current Regulatory Assets | [1] | 244 | 262
Deferred Midwest Independent Service Operator Costs |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Non Current Regulatory Assets |  | 61 | 75
Environmental Restoration Costs [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Non Current Regulatory Assets |  | 81 | 85
Other Regulatory Assets |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Current Regulatory Assets |  | 73 | 57
Total Non Current Regulatory Assets |  | 126 | 108
Petersburg Unit Retirement Costs |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Non Current Regulatory Assets |  | $ 75 | $ 0
[1] | Past expenditures on which the Company earns a rate of return.

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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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