Asset Retirement Obligations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Asset retirement obligation, roll forward analysis [Roll Forward]
Beginning balance	$ 1,850us-gaap_AssetRetirementObligation	$ 1,715us-gaap_AssetRetirementObligation
Liabilities incurred	30	25
Accretion expense	108	99
Liabilities settled	(1)	(3)
Revision in estimated cash flows - net	(1)	14
Ending balance	1,986us-gaap_AssetRetirementObligation	1,850us-gaap_AssetRetirementObligation
Restricted funds included in special use funds [Abstract]
Restricted funds	5,091	4,706
NEER [Member]
Asset retirement obligation, roll forward analysis [Roll Forward]
Beginning balance	565	509
Liabilities incurred	29	24
Accretion expense	38	35
Liabilities settled	(1)	(2)
Revision in estimated cash flows - net	0	(1)
Ending balance	631	565
Restricted funds included in special use funds [Abstract]
Restricted funds	1,642	1,507
FPL [Member]
Asset retirement obligation, roll forward analysis [Roll Forward]
Beginning balance	1,285	1,206
Liabilities incurred	1	1
Accretion expense	70	64
Liabilities settled	0	(1)
Revision in estimated cash flows - net	(1)	15
Ending balance	1,355	1,285
Restricted funds included in special use funds [Abstract]
Restricted funds	$ 3,449	$ 3,199

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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 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848

Reference 2: 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

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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

+ Details

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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

+ Details

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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

+ Details

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