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Investments in Partnerships and Joint Ventures (Tables) | 12 Months Ended
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Dec. 31, 2017
Investments in Partnerships and Joint Ventures [Abstract] |
Summarized combined information for principal operating entities | Summarized combined information for these principal entities is as follows:
| 2017 |  | 2016
| (millions)
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 share of underlying equity in the principal entities | $ | 2,024 |  |  | $ | 1,423 |
Difference between investment carrying amount and underlying equity in net assets(a) | 105 |  |  | 65 |
NEER's investment carrying amount for the principal entities | $ | 2,129 |  |  | $ | 1,488 |
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(a) | Substantially all of the difference between the investment carrying amount and the underlying equity in net assets is being amortized over a 25-year period.

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- Definition Investments in Partnerships and Joint Ventures [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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