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NEP (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Schedule of Investments [Line Items] |  |  |  |  |
Investment in equity method investees | $ 7,144 |  | $ 7,144 |  | $ 7,453
Guarantor obligations, current carrying value | 647 |  | 647 |  |
Debt instrument, fair value disclosure | 31 |  | 31 |  |
Cash Sweep And Credit Support Agreement [Member] | NEER [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Fee income | 31 | $ 27 | 88 | $ 75 |
Due from related parties, current | 61 |  | 61 |  | 53
Due from related parties, noncurrent | 33 |  | 33 |  | 33
Cash Sweep And Credit Support Agreement [Member] | NEER [Member] | NextEra Energy Partners [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Due to related parties | $ 82 |  | $ 82 |  | $ 12

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