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