Summary of Significant Accounting and Reporting Policies (Details) $ in Millions	1 Months Ended		3 Months Ended			9 Months Ended
	Sep. 30, 2019 USD ($) MW	Jun. 30, 2019 USD ($) wind_generation_facility solar_generation_facility MW	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	[1]	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	[1]	Dec. 31, 2018 USD ($)
Subsidiary, Sale of Stock [Line Items]
Restricted Cash and Cash Equivalents	$ 427		$ 427			$ 427			$ 4,615
Restricted cash related to margin cash collateral that is netted against derivative instruments	55		55			55			184
Gain in connection with sale			(2)	$ 6		378	$ 48
FPL [Member]
Subsidiary, Sale of Stock [Line Items]
Storm Restoration Costs	274		274			274
Storm restoration costs in excess of storm and property insurance reserve	166		166			166
Restricted Cash and Cash Equivalents	$ 151		151			151			142
NextEra Energy Resources [Member]
Subsidiary, Sale of Stock [Line Items]
Wind electric generating facility capability (in megawatts) | MW	220
Other Current Liabilities [Member]
Subsidiary, Sale of Stock [Line Items]
Accrued Storm Restoration Costs	$ 240		240			240
Other Current Liabilities [Member] | FPL [Member]
Subsidiary, Sale of Stock [Line Items]
Accrued Storm Restoration Costs	240		240			240
Other Current Assets [Member]
Subsidiary, Sale of Stock [Line Items]
Restricted cash and cash equivalents, current	338		338			338			89
Other Current Assets [Member] | FPL [Member]
Subsidiary, Sale of Stock [Line Items]
Restricted cash and cash equivalents, current	62		62			62			$ 81
Taxes other than income taxes and other - net [Member] | NextEra Energy Resources [Member]
Subsidiary, Sale of Stock [Line Items]
Write-off of capitalized development costs			73			73
Write-off of capitalized development costs, net			54			54
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
Gain in connection with sale, after tax						259
Noncontrolling interest	118		118			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		$ 1,020
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
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 purchased | solar_generation_facility		2

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