Summary of Significant Accounting and Reporting Policies (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	[1]	Jun. 30, 2018	Jun. 30, 2017		Dec. 31, 2017
Subsidiary, Sale of Stock [Line Items]
Restricted cash and cash equivalents, current	$ 258			$ 258			$ 269
Restricted cash related to margin cash collateral that is netted against derivative instruments	53			53
Net income (loss) attributable to noncontrolling interest	(94)	$ 11		(691)	$ 19	[1]
FPL [Member]
Subsidiary, Sale of Stock [Line Items]
Restricted cash and cash equivalents, current	74			74			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	245			245			247
Other Current Assets [Member] | FPL [Member]
Subsidiary, Sale of Stock [Line Items]
Restricted cash and cash equivalents, current	61			61			$ 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
Net income (loss) attributable to noncontrolling interest				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, after tax				(34)
Cumulative effect on retained earnings, before tax				56
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, after tax				52
Cumulative effect on retained earnings, before tax				69
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)			(77)
Additional paid in capital, after tax	59			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			842
Additional paid in capital, after tax	$ (652)			$ (652)

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