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Regulatory Assets and Liabilities Regulatory Assets and Liabilities - by Reportable Segment (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets | $ 661 | $ 743
Regulatory Liabilities | 1,096 | 843
Brazil SBU |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets | 0 | 0
Regulatory Liabilities | 1 | 1
US SBU |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets | 602 | 689
Regulatory Liabilities | 1,095 | 842
MCAC SBU |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets | 59 | 54
Regulatory Liabilities | $ 0 | $ 0

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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 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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