Summary of Significant Accounting and Reporting Policies - Additional Information (Details) € in Millions, $ in Millions				1 Months Ended	3 Months Ended			9 Months Ended
		Oct. 25, 2021 USD ($) facility MW	Feb. 29, 2020 EUR (€) MW	Feb. 29, 2020 EUR (€) solar_generation_facility	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)		Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)		Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) MW		Sep. 29, 2020 USD ($)	Jun. 30, 2020 USD ($)		Dec. 31, 2019 USD ($)
Accounting Policies [Line Items]
Restricted Cash and Cash Equivalents					$ 312			$ 312					$ 441
Restricted cash related to margin cash collateral that is netted against derivative instruments					761			761					183
restricted cash related to margin cash collateral that is netted against derivative liabilities					410			410					136
Gain in connection with sale					13	$ (11)		20	$ 279
Customer deposits					482			482					474
Bad debt expense, including credit losses								143	79
Noncurrent accounts receivable allowances					127			127
Retained Earnings					44,647	42,062		44,647	42,062		$ 45,114		44,929			$ 41,574		$ 41,360
Gulf Power Segment
Accounting Policies [Line Items]
Regulatory Assets, Coal Generating Assets, Remaining Net Book Value												$ 462
Hurricane Sally | Gulf Power Segment
Accounting Policies [Line Items]
Recoverable storm costs					186
FPL [Member]
Accounting Policies [Line Items]
Restricted Cash and Cash Equivalents					68			68					135
Customer deposits					475			475					468	[1]
Retained Earnings					33,079	29,120	[2]	33,079	29,120	[2]	31,488		$ 29,228	[1]		29,882	[2]	25,797	[2]
Subsidiary of NextEra Energy Resources
Accounting Policies [Line Items]
Solar Generating Capacity | MW													100
Solar Plus Storage Facility Capacity | MW													30
Customer deposits													$ 155
Subsidiary of NextEra Energy Resources | Subsequent Event | United States, Geographically Dispersed
Accounting Policies [Line Items]
Generating capacity (MW) | MW		122
Number of solar generation facilities | facility		4
Subsidiary of NextEra Energy Resources | Solar-Plus-Storage Facility
Accounting Policies [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners													100.00%
Retained Earnings [Member]
Accounting Policies [Line Items]
Retained Earnings					25,464	26,054		25,464	26,054		25,773		$ 25,363			25,511		25,199
Retained Earnings [Member] | Adoption of accounting standards update [Member]
Accounting Policies [Line Items]
Retained Earnings	[3]																	(11)
Retained Earnings [Member] | FPL [Member]
Accounting Policies [Line Items]
Retained Earnings					11,770	$ 9,512	[2]	11,770	9,512	[2]	$ 10,843		9,619	[2]		$ 10,424	[2]	$ 8,939	[2]
Other Current Assets [Member]
Accounting Policies [Line Items]
Restricted cash and cash equivalents, current					312			312					374
Other Current Assets [Member] | FPL [Member]
Accounting Policies [Line Items]
Restricted cash and cash equivalents, current					68			68					$ 93
Two solar generation facilities located in Spain | Disposed of by Sale [Member]
Accounting Policies [Line Items]
Gain in connection with sale									270
Gain (after tax) in connection with sale									$ 270
Two solar generation facilities located in Spain | Disposed of by Sale [Member] | NextEra Energy Resources [Member]
Accounting Policies [Line Items]
Number of generation facilities sold | solar_generation_facility				2
Generating capacity (MW) | MW			99.8
Purchase price			€ 111	€ 111											$ 121
Three wind facilities and one solar facility | Disposed of by Sale [Member]
Accounting Policies [Line Items]
Disposal Group, Including Discontinued Operation, Other Assets, Current					546			546
Disposal Group, Including Discontinued Operation, Other Liabilities, Current					$ 20			$ 20
Three wind facilities and one solar facility | Disposed of by Sale [Member] | Subsidiary of NextEra Energy Resources | Subsequent Event | United States, Midwest and West Regions
Accounting Policies [Line Items]
Generating capacity (MW) | MW		467
Number of wind generation facilities | facility		3
Number of solar generation facilities | facility		1
Three wind facilities and one solar facility | Disposed of by Sale [Member] | Subsidiary of NextEra Energy Resources | NEP | Subsequent Event | United States, Midwest and West Regions
Accounting Policies [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		100.00%
Assumption Of Noncontrolling Interest		$ 122
Four solar facilities and multiple generation solar facilities | Disposed of by Sale [Member] | Subsidiary of NextEra Energy Resources | NEP | Subsequent Event | United States, Geographically Dispersed
Accounting Policies [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		33.30%
Other Noncontrolling Interests		$ 124
Three wind generation facilities and one solar facility and four solar facilities and multiple distributed generation solar facilities | Disposed of by Sale [Member] | NextEra Energy Resources [Member] | Subsequent Event
Accounting Policies [Line Items]
Purchase price		563
Disposal Group, Including Discontinued Operation, Working Capital		$ 26
Seven wind facilities, six solar facilities and storage capacity | Disposed of by Sale [Member] | Subsidiary of NextEra Energy Resources | NEP | Subsequent Event | United States, Geographically Dispersed
Accounting Policies [Line Items]
Generating capacity (MW) | MW		1,260
Purchase price		$ 849
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		50.00%
Solar Plus Storage Facility Capacity | MW		58
Number of wind generation facilities | facility		7
Number of solar generation facilities | facility		6
Assumption Of Noncontrolling Interest		$ 866

[1] Amounts have been retrospectively adjusted to reflect the merger of FPL and Gulf Power Company, see Note 5 – Merger of FPL and Gulf Power Company.

[2] Amounts have been retrospectively adjusted to reflect the merger of FPL and Gulf Power Company, see Note 5 – Merger of FPL and Gulf Power Company.

[3] See Note 11 – Measurement of Credit Losses on Financial Instruments.