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NEP Deconsolidation (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Jul. 31, 2018 | Dec. 31, 2017
Investment [Line Items] |  |  |  |
Investment in equity method investees | $ 6,493,000,000 | $ 6,493,000,000 |  | $ 2,321,000,000
Deconsolidation, revaluation of retained investment, gain (loss), amount, before tax |  | 3,900,000,000 |  |
Deconsolidation, revaluation of retained investment, gain (loss), amount, after tax |  | 3,000,000,000 |  |
Plant, property, and equipment, decrease from deconsolidation |  | 7,800,000,000 |  |
Long-term debt, decrease from deconsolidation |  | 4,800,000,000 |  |
Noncontrolling interest, decrease from deconsolidation |  | 2,700,000,000 |  |
Fee income | 18,000,000 | 66,000,000 |  |
Due from related parties, current | 38,000,000 | 38,000,000 |  |
Due from related parties, noncurrent | 21,000,000 | 21,000,000 |  |
Guarantor obligations, current carrying value | 635,000,000 | 635,000,000 |  |
Debt instrument, fair value disclosure | 32,000,000 | 32,000,000 |  |
NextEra Energy Partners [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Investment in equity method investees | $ 4,400,000,000 | $ 4,400,000,000 |  |
Equity method investment, ownership percentage | 2.50% | 2.50% |  |
Equity method investment, difference between carrying amount and underlying equity | $ 3,300,000,000 | $ 3,300,000,000 |  |
NextEra Energy Partners [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Due to related parties | 807,000,000 | $ 807,000,000 |  |
NEP OpCo [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Limited liability company or limited partnership, members or limited partners, ownership interest |  | 64.40% |  |
NextEra Energy Partners [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Issuances of common units | $ 82,000,000 |  |  |
At-the-market equity issuance program |  |  | $ 150,000,000 |

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