Debt - Narrative (Details) $ in Millions	1 Months Ended		6 Months Ended
	Jul. 24, 2019 USD ($) revolving_credit_facility	Apr. 30, 2019 USD ($)	Jun. 30, 2019 USD ($) financing	Jun. 30, 2018 USD ($)	[1]
Debt Instrument [Line Items]
Issuances of long-term debt			$ 7,554	$ 2,875
Number of financings with waivers | financing			2
Total principal outstanding			$ 164
Debt classified as current			$ 184
Number of financings remaining in default | financing			1
NextEra Energy Capital Holdings, Inc. [Member]
Debt Instrument [Line Items]
Repayments of short-term term loan agreements		$ 4,500
Subsequent Event [Member] | NextEra Energy Capital Holdings, Inc. [Member]
Debt Instrument [Line Items]
Borrowings from revolving credit facilities	$ 700
Number of revolving credit facilities | revolving_credit_facility	4

[1] Amounts have been retrospectively adjusted for an accounting standards update related to leases.