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NEP (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
NEP (Details) - USD ($) $ in Millions	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Investment [Line Items]
Investment in equity method investees	$ 7,180		$ 7,180		$ 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	751		751
Debt instrument, fair value disclosure	34		34
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	27	$ 18	75	$ 66
Due from related parties, current	58		58		45
Due from related parties, noncurrent	68		68		34
Cash Sweep And Credit Support Agreement [Member] \| NEER [Member] \| NextEra Energy Partners [Member]
Investment [Line Items]
Due to related parties	$ 525		$ 525		$ 66