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Summary of Significant Accounting and Reporting Policies (Details) € in Millions, $ in Millions		3 Months Ended
	Feb. 11, 2020 USD ($) solar_generation_facility MW	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Feb. 11, 2020 EUR (€)	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($)
Subsidiary, Sale of Stock [Line Items]
Restricted Cash and Cash Equivalents		$ 499				$ 508
Restricted cash related to margin cash collateral that is netted against derivative instruments		160				139
restricted cash related to margin cash collateral that is netted against derivative liabilities		113				66
Gain in connection with sale		273	$ 26
Retained earnings		24,922				25,199
FPL [Member]
Subsidiary, Sale of Stock [Line Items]
Restricted Cash and Cash Equivalents		132				118
Retained earnings		9,816				9,174
Measurement of Credit Losses on Financial Instruments [Member]
Subsidiary, Sale of Stock [Line Items]
Retained earnings					$ 11
Other Current Assets [Member]
Subsidiary, Sale of Stock [Line Items]
Restricted cash and cash equivalents, current		392				411
Other Current Assets [Member] \| FPL [Member]
Subsidiary, Sale of Stock [Line Items]
Restricted cash and cash equivalents, current		77				54
Two solar generation facilities located in Spain [Member] \| Disposed of by Sale [Member]
Subsidiary, Sale of Stock [Line Items]
Gain in connection with sale		$ 260
Disposal Group, Including Discontinued Operation, Other Assets, Current						440
Disposal Group, Including Discontinued Operation, Other Liabilities, Current						$ 647
Two solar generation facilities located in Spain [Member] \| Disposed of by Sale [Member] \| NextEra Energy Resources [Member]
Subsidiary, Sale of Stock [Line Items]
Number of generation facilities purchased \| solar_generation_facility	2
Generating capacity (MW) \| MW	99.8
Purchase price	$ 128			€ 117