Summary of Significant Accounting and Reporting Policies (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017		Dec. 31, 2017
Subsidiary, Sale of Stock [Line Items]
Restricted cash and cash equivalents, current	$ 358			$ 269
Restricted cash related to margin cash collateral that is netted against derivative instruments	2
LESS NET INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(597)	$ 8	[1]
FPL [Member]
Subsidiary, Sale of Stock [Line Items]
Restricted cash and cash equivalents, current	116			141
FPL FiberNet [Member] | Indirect Wholly-Owned Subsidiary [Member]
Subsidiary, Sale of Stock [Line Items]
Proceeds from sale of ownership interest in subsidiary		1,100
Retirement of debt		370
Gain on sale of ownership interest in subsidiary		1,100
Gain on sale of ownership interest in subsidiary after-tax		$ 685
Other Current Assets [Member]
Subsidiary, Sale of Stock [Line Items]
Restricted cash and cash equivalents, current	345			247
Other Current Assets [Member] | FPL [Member]
Subsidiary, Sale of Stock [Line Items]
Restricted cash and cash equivalents, current	103			$ 128
Accounting Standards Update 2017-05 - Sales of Differential Membership Interests [Member]
Subsidiary, Sale of Stock [Line Items]
Income (loss) attributable to noncontrolling interest, before tax	497
LESS NET INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTERESTS	373
Retained Earnings [Member] | Accounting Standards Update 2017-05 - Sales of Differential Membership Interests [Member]
Subsidiary, Sale of Stock [Line Items]
Cumulative effect on retained earnings, before tax	56
Cumulative effect on retained earnings, after tax	(34)
Retained Earnings [Member] | Accounting Standards Update 2017-05 - NEER Sale of Assets to NEP [Member] | NextEra Energy Resources [Member]
Subsidiary, Sale of Stock [Line Items]
Cumulative effect on retained earnings, before tax	69
Cumulative effect on retained earnings, after tax	52
Additional Paid-in Capital [Member] | Accounting Standards Update 2017-05 - Sales of Differential Membership Interests [Member]
Subsidiary, Sale of Stock [Line Items]
Additional paid in capital	(77)
Additional paid in capital, after tax	59
Additional Paid-in Capital [Member] | Accounting Standards Update 2017-05 - NEER Sale of Assets to NEP [Member] | NextEra Energy Resources [Member]
Subsidiary, Sale of Stock [Line Items]
Additional paid in capital	842
Additional paid in capital, after tax	$ (652)

[1] Prior period amounts have been retrospectively adjusted as discussed in Note 3 - Amendments to Presentation of Retirement Benefits.