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Derivative Instruments (Credit-Risk-Related Contingent Features) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Fair value of derivative instruments with credit-risk-related contingent features that were in a liability position	$ 1,600	$ 1,100
Total required posted collateral should FPL's and Capital Holdings' credit ratings fall to BBB/Baa2	95	145
Total required posted collateral should FLP's and Capital Holdings' credit ratings fall below investment grade	1,100	1,200
Additional collateral requirements if non-ratings based contract provisions are triggered	195	210
Collateral already posted, aggregate fair value	2	2
Letters of credit posted through the normal course of business that could be applied toward the collateral requirements related to derivative instruments with credit-risk-related contingent features	25	20
FPL [Member]
Derivative [Line Items]
Fair value of derivative instruments with credit-risk-related contingent features that were in a liability position	3	3
Total required posted collateral should FPL's and Capital Holdings' credit ratings fall to BBB/Baa2	0	0
Total required posted collateral should FLP's and Capital Holdings' credit ratings fall below investment grade	0	0
Additional collateral requirements if non-ratings based contract provisions are triggered	85	95
Collateral already posted, aggregate fair value	0	0
Letters of credit posted through the normal course of business that could be applied toward the collateral requirements related to derivative instruments with credit-risk-related contingent features	$ 0	$ 0

X

- Definition

The aggregate fair value of collateral that would be required to be posted for derivative instruments with credit-risk-related contingent features if the applicable corporate credit ratings were downgraded to BBB/Baa2 at the end of the reporting period.

+ References

No definition available.

+ Details

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- Definition

The aggregate fair value of collateral that would be required to be posted for derivative instruments with credit-risk-related contingent features if the applicable corporate credit ratings were downgraded to below investment grade at the end of the reporting period.

+ References

No definition available.

+ Details

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X

- Definition

The aggregate fair value of additional collateral that would be required to be posted for derivative instruments with credit-risk-related contingent features if certain cross-default provisions or certain financial measurement requirements were triggered at the end of the reporting period.

+ References

No definition available.

+ Details

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- Definition

Letters of Credit that are already posted in the normal course of business, at the end of the reporting period, that could be applied toward the collateral requirements for derivative instruments with credit-risk-related contingent features.

+ References

No definition available.

+ Details

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- Definition

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624258-113959

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624258-113959

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