Summary of Significant Accounting and Reporting Policies (Details) € in Millions, $ in Millions		1 Months Ended		3 Months Ended		9 Months Ended
	Feb. 11, 2020 solar_generation_facility MW	Sep. 30, 2019 MW	Jun. 30, 2019 USD ($) solar_generation_facility wind_generation_facility MW	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 EUR (€)	Sep. 15, 2020 customer	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($)
Subsidiary, Sale of Stock [Line Items]
Restricted Cash and Cash Equivalents				$ 476		$ 476					$ 508
Restricted cash related to margin cash collateral that is netted against derivative instruments				158		158					139
restricted cash related to margin cash collateral that is netted against derivative liabilities				14		14					66
Gain in connection with sale				(11)	$ (2)	279	$ 378
Retained earnings				26,054		26,054					25,199
Impairment of Long-Lived Assets Held-for-use					73		73
Impairment of Long-Lived Assets Held-for-use, Net of Tax					$ 54		54
FPL [Member]
Subsidiary, Sale of Stock [Line Items]
Restricted Cash and Cash Equivalents				114		114					118
Retained earnings				9,562		9,562					9,174
NextEra Energy Resources [Member]
Subsidiary, Sale of Stock [Line Items]
Wind electric generating facility capability (in megawatts) | MW		220
Gulf Power [Member]
Subsidiary, Sale of Stock [Line Items]
Number of customers experienced electrical outlets | customer									285,000
Recoverable storm costs				200
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				368		368					411
Other Current Assets [Member] | FPL [Member]
Subsidiary, Sale of Stock [Line Items]
Restricted cash and cash equivalents, current				73		73					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						270
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 sold | solar_generation_facility	2
Generating capacity (MW) | MW	99.8
Purchase price				$ 121		$ 121		€ 111
Wind plants [Member] | Disposed of by Sale [Member] | NextEra Energy Resources [Member]
Subsidiary, Sale of Stock [Line Items]
Number of generation facilities sold | wind_generation_facility			3
Solar plants [Member] | Disposed of by Sale [Member] | NextEra Energy Resources [Member]
Subsidiary, Sale of Stock [Line Items]
Number of generation facilities sold | solar_generation_facility			3
Solar plants [Member] | Disposed of by Sale [Member] | Noncontrolling Interest [Member] | NextEra Energy Resources [Member]
Subsidiary, Sale of Stock [Line Items]
Number of generation facilities sold | solar_generation_facility			2
Three Wind Generation Facilities And Three Solar Generation Facilities [Member] | Disposed of by Sale [Member]
Subsidiary, Sale of Stock [Line Items]
Gain in connection with sale							341
Disposal Group, Not Discontinued Operation, Gain (Loss) On Disposal, Net Of Tax							$ 259
Disposal Group, Including Discontinued Operation, Stockholders' Equity Attributable to Noncontrolling Interest											$ 118
Three Wind Generation Facilities And Three Solar Generation Facilities [Member] | Disposed of by Sale [Member] | NextEra Energy Resources [Member]
Subsidiary, Sale of Stock [Line Items]
Generating capacity (MW) | MW			611
Purchase price			$ 1,000
Disposal Group, Including Discontinued Operation, Working Capital			$ 12