Asset Retirement Obligations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Asset retirement obligation, roll forward analysis [Roll Forward]
Beginning balance	$ 1,715	$ 1,611
Liabilities incurred	25	20
Accretion expense	99	94
Liabilities settled	(3)	(8)
Revision in estimated cash flows - net	14	(2)
Ending balance	1,850	1,715
Restricted funds included in special use funds [Abstract]
Restricted funds	4,706	4,117
NEER [Member]
Asset retirement obligation, roll forward analysis [Roll Forward]
Beginning balance	509	467
Liabilities incurred	24	11
Accretion expense	35	32
Liabilities settled	(2)	0
Revision in estimated cash flows - net	(1)	(1)
Ending balance	565	509
Restricted funds included in special use funds [Abstract]
Restricted funds	1,507	1,272
FPL [Member]
Asset retirement obligation, roll forward analysis [Roll Forward]
Beginning balance	1,206	1,144
Liabilities incurred	1	9
Accretion expense	64	62
Liabilities settled	(1)	(8)
Revision in estimated cash flows - net	15	(1)
Ending balance	1,285	1,206
Restricted funds included in special use funds [Abstract]
Restricted funds	$ 3,199	$ 2,845

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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

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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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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Amount of asset retirement obligations incurred during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

Noncurrent portion of 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 Statement of Financial Accounting Standard (FAS)

-Number 143

-Paragraph 3, 10, 22

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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