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Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Current Regulatory Assets |  | $ 546 | $ 627
Total Non Current Regulatory Assets |  | 741 | 887
TOTAL REGULATORY ASSETS |  | 1,287 | 1,514
Total Current Regulatory Liabilities |  | 538 | 408
Total Non Current Regulatory Liabilities |  | 1,363 | 1,209
TOTAL REGULATORY LIABILITIES |  | 1,901 | 1,617
Efficiency Program Costs |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Current Regulatory Liabilities |  | 36 | 9
Total Non Current Regulatory Liabilities |  | 24 | 14
Brazil Tariff Recoveries Energy Purchases Liability |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Current Regulatory Liabilities |  | 211 | 105
Total Non Current Regulatory Liabilities |  | 7 | 30
Brazil Tariff Recoveries Transmission Costs Regulatory Fees And Other Liability |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Current Regulatory Liabilities |  | 249 | 235
Total Non Current Regulatory Liabilities |  | 170 | 86
Asset Retirement Obligation Costs |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Non Current Regulatory Liabilities |  | 795 | 759
Brazil Special Obligations |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Non Current Regulatory Liabilities |  | 362 | 313
Other Regulatory Liabilities |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Current Regulatory Liabilities |  | 42 | 59
Total Non Current Regulatory Liabilities |  | 5 | 7
Brazil Tariff Recoveries Energy Purchases Asset |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Current Regulatory Assets | [1] | 319 | 349
Total Non Current Regulatory Assets | [1] | 63 | 132
Brazil Tariff Recoveries Transmission Costs Regulatory Fees And Other Asset |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Current Regulatory Assets | [1] | 139 | 212
Total Non Current Regulatory Assets | [1] | 18 | 124
El Salvador Tariff Recoveries |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Current Regulatory Assets | [1] | 54 | 43
Pension Costs |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Non Current Regulatory Assets |  | 316 | 227
Income Taxes Recoverable From Customers |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Non Current Regulatory Assets |  | 87 | 36
Deferred Midwest Independent Service Operator Costs |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Non Current Regulatory Assets | [1] | 114 | 129
Other Regulatory Assets |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Total Current Regulatory Assets |  | 34 | 23
Total Non Current Regulatory Assets |  | 143 | 239
Other current regulatory assets that did not earn a rate of return |  | 34 | 8
Other noncurrent regulatory assets that did not earn a rate of return |  | $ 138 | $ 237
[1] | Past expenditures on which the Company does not earn a rate of return.

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- Definition Remaining balance of current regulatory assets for which no return on investment during recovery is provided. In some cases, a regulator may permit an enterprise to include a cost that would be charged to expense by an unregulated enterprise as an allowable cost over a period of time by amortizing that cost for rate-making purposes, but the regulator does not include the unrecovered amount in the rate base. + References No definition available. + Details
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- Definition Remaining balance of noncurrent regulatory assets for which no return on investment during recovery is provided. In some cases, a regulator may permit an enterprise to include a cost that would be charged to expense by an unregulated enterprise as an allowable cost over a period of time by amortizing that cost for rate-making purposes, but the regulator does not include the unrecovered amount in the rate base + References No definition available. + Details
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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://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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- 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://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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- Definition The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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