Derivative Instruments (Income Statement Disclosure) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Gains on disposal of businesses/assets	$ 14	$ 273
Not Designated as Hedging Instrument [Member]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	217	(385)
Not Designated as Hedging Instrument [Member] \| Commodity Contract [Member] \| Gains (losses) included in operating revenues [Member]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(488)	625
Not Designated as Hedging Instrument [Member] \| Foreign Exchange Contract [Member] \| Gain Loss Included In Interest Expense Member
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(40)	(79)
Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member] \| Gain Loss Included In Interest Expense Member
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	747	(905)
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Not Designated as Hedging Instrument [Member] \| Foreign Exchange Contract [Member] \| Gain Loss Included In Interest Expense Member
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Interest Expense	(1)	(1)
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member] \| Gain Loss Included In Interest Expense Member
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Interest Expense	(1)	(25)
Gains on disposal of businesses/assets		(23)
FPL [Member]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Gains (losses) on commodity contracts, recorded as regulatory assets and or liabilities on the balance sheet due to regulatory treatment	$ (7)	$ (3)

Pursuant to regulatory accounting treatment, net gain (loss) recorded by FPL that is included in regulatory assets and or liabilities for the period from the net change in fair value of derivative instrument not designated as hedging instrument.

No definition available.

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- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4CC
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-Subparagraph (e)
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- Definition

Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228

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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

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-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
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