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Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 4,000	$ 3,900
NEER Segment
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation	810
Unrecognized Revenue	180
FPL [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,000	$ 2,900
Unbilled revenues	466		$ 454
Revenue, remaining performance obligation	$ 420
Revenue Benchmark [Member] | FPL [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	90.00%

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Unrecognized Revenue

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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, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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