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Capitalization - (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended
--- | --- | ---
Apr. 23, 2018 | Mar. 31, 2018 | Mar. 31, 2017
Numerator: |  |  |  |
Net income attributable to NEP – basic |  | $ 73 | $ 12 | [1]
Adjustments for convertible notes and preferred units |  | 16 |  |
Net income attributable to NEP used to compute diluted earnings per unit |  | $ 89 |  |
Denominator: |  |  |  |
Weighted average number of common units outstanding - basic (in shares) |  | 54,300,000 | 54,200,000 | [1]
Convertible notes and preferred units (in shares) |  | 19,700,000.0 |  |
Weighted-average number of common units outstanding – assuming dilution (in shares) |  | 74,000,000 | 54,200,000 | [1]
Earnings per unit attributable to NEP: |  |  |  |
Basic (in shares) |  | $ 1.35 | $ 0.22 | [1]
Assuming dilution (in shares) |  | $ 1.21 | $ 0.22 |
Subsequent Event [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Distribution made to limited partner, distributions declared, per unit (in dollars per share) | $ 0.42 |  |  |
[1] | Prior-period financial information has been retrospectively adjusted as discussed in Note 1.

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