Equity (Narrative) (Details) - USD ($)		1 Months Ended	6 Months Ended
	Jun. 28, 2017	Nov. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Class of Stock [Line Items]
Forward sale agreement, number of shares		12,000,000
Forward sale price (in dollars per share)		$ 124.00
Share price (in dollars per share)			$ 140.13
Common Stock [Member]
Class of Stock [Line Items]
Issuance of common stock (in shares)			1,000,000	0
Forward Counterparty [Member] | Common Stock [Member]
Class of Stock [Line Items]
Settlement of shares	6,000,000
Issuance of common stock (in shares)	744,599
Forward Counterparties, Other [Member] | Common Stock [Member]
Class of Stock [Line Items]
Settlement of shares			820,000
Series A Preferred Units [Member] | NextEra Energy Partners, LP [Member]
Class of Stock [Line Items]
Preferred unit purchase agreement, amount to be issued and sold			$ 550,000,000