Asset Retirement Obligations (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Asset retirement obligation, roll forward analysis [Roll Forward]
Beginning balance	$ 1,986	$ 1,850
Liabilities incurred	51	30
Accretion expense	116	108
Liabilities settled	(22)	(1)
Revision in estimated cash flows - net	338	(1)
Ending balance	2,469	1,986
Restricted funds included in special use funds [Abstract]
Restricted funds	5,064	5,091
NEER [Member]
Asset retirement obligation, roll forward analysis [Roll Forward]
Beginning balance	631	565
Liabilities incurred	46	29
Accretion expense	43	38
Liabilities settled	(2)	(1)
Revision in estimated cash flows - net	(71)	0
Ending balance	647	631
Restricted funds included in special use funds [Abstract]
Restricted funds	1,634	1,642
FPL [Member]
Asset retirement obligation, roll forward analysis [Roll Forward]
Beginning balance	1,355	1,285
Liabilities incurred	5	1
Accretion expense	73	70
Liabilities settled	(20)	0
Revision in estimated cash flows - net	409	(1)
Ending balance	1,822	1,355
Restricted funds included in special use funds [Abstract]
Restricted funds	$ 3,430	$ 3,449

No definition available.

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- Definition

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Asset Retirement Obligation
-URI http://asc.fasb.org/extlink&oid=6505190

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- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848

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- Definition

Carrying amount of an asset that is legally restricted for purposes of settling an asset retirement obligation.

+ References

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- Definition

Amount of asset retirement obligations incurred during the period.

+ References

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- Definition

Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

+ References

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- Definition

Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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