For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of the cumulative effect on retained earnings net of related income tax effect.

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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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Revenue Recognition (Details) - USD ($) $ in Millions		3 Months Ended	9 Months Ended
Revenue Recognition (Details) - USD ($) $ in Millions	Jan. 01, 2018	Sep. 30, 2018	Sep. 30, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers		$ 4,100	$ 10,900
FPL [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers		3,400	8,900
NextEra Energy Resources [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, remaining performance obligation		$ 650	$ 650
Sales Revenue, Net [Member] \| FPL [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Concentration risk, percentage			90.00%
Retained Earnings [Member] \| Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net reduction to retained earnings	$ 25