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Investments in Partnerships and Joint Ventures (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Equity method investment, financial statement, reported amounts [Abstract] |  |  |
Ownership interest in partnerships and joint ventures | $ 2,321 | $ 1,767 |
NextEra Energy Resources' ownership interest, low range (in hundredths) | 31.00% |  |
NextEra Energy Resources' ownership interest, high range (in hundredths) | 50.00% |  |
Equity method investment, summarized financial information [Abstract] |  |  |
Net income | $ 358 | 264 |
Total assets | 6,001 | 4,502 |
Total liabilities | 1,217 | 1,364 |
Partners'/members' equity | 4,784 | 3,138 |
NEER's investment carrying amount for the principal entities | 2,321 | 1,767 | $ 1,063
NEER [Member] |  |  |
Equity method investment, summarized financial information [Abstract] |  |  |
NEER's share of underlying equity in the principal entities | 2,024 | 1,423 |
Difference between investment carrying amount and underlying equity in net assets | 105 | 65 |
NEER's investment carrying amount for the principal entities | $ 2,129 | $ 1,488 |

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- Definition Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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