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NEP (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Investment [Line Items] |  |  |  |  |
Investment in equity method investees | $ 7,202 |  | $ 7,202 |  | $ 6,748
Deconsolidation, revaluation of retained investment, gain (loss), amount, before tax |  |  | 3,900 |  |
Deconsolidation, revaluation of retained investment, gain (loss), amount, after tax |  |  | 3,000 |  |
Guarantor obligations, current carrying value | 763 |  | 763 |  |
Debt instrument, fair value disclosure | 35 |  | 35 |  |
NextEra Energy Partners [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Investment in equity method investees | 4,400 |  | 4,400 |  |
Cash Sweep And Credit Support Agreement [Member] | NEER [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Fee income | 24 | $ 24 | 48 | $ 48 |
Due from related parties, current | 59 |  | 59 |  | 45
Due from related parties, noncurrent | 57 |  | 57 |  | 34
Cash Sweep And Credit Support Agreement [Member] | NEER [Member] | NextEra Energy Partners [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Due to related parties | $ 737 |  | $ 737 |  | $ 66

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