Summary of Significant Accounting and Reporting Policies (Details) $ in Millions	1 Months Ended	3 Months Ended			6 Months Ended
	Jun. 30, 2019 USD ($) solar_generation_facility wind_generation_facility MW	Jun. 30, 2019 USD ($) MW	Jun. 30, 2018 USD ($)	[1]	Jun. 30, 2019 USD ($) MW	Jun. 30, 2018 USD ($)	[1]	Dec. 31, 2018 USD ($)
Subsidiary, Sale of Stock [Line Items]
Restricted Cash and Cash Equivalents	$ 684	$ 684			$ 684			$ 4,615
Restricted cash related to margin cash collateral that is netted against derivative instruments	(220)	(220)			(220)			184
Gain in connection with sale		354	$ 28		380	$ 42
FPL [Member]
Subsidiary, Sale of Stock [Line Items]
Restricted Cash and Cash Equivalents	167	167			167			142
Other Current Assets [Member]
Subsidiary, Sale of Stock [Line Items]
Restricted cash and cash equivalents, current	595	595			595			89
Other Current Assets [Member] | FPL [Member]
Subsidiary, Sale of Stock [Line Items]
Restricted cash and cash equivalents, current	$ 77	77			77			$ 81
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		351			351
Gain in connection with sale, after tax		$ 266			$ 266
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	611			611
Purchase price	$ 1,020	$ 1,020			$ 1,020
Working capital	$ 12	$ 12			$ 12
Wind plants [Member] | Disposed of by Sale [Member] | NextEra Energy Resources [Member]
Subsidiary, Sale of Stock [Line Items]
Number of generation facilities purchased | 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 purchased | solar_generation_facility	3

[1] Amounts have been retrospectively adjusted for an accounting standards update related to leases.