Debt (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
NextEra Energy Capital Holdings and NextEra Energy Resources subsidiary [Member] | Canadian revolving credit agreements [Member]
Debt Instrument [Line Items]
Interest Rate Terms	Variable	[1]
Increase of additional borrowings on existing and new debt instruments	$ 75
NextEra Energy Capital Holdings and NextEra Energy Resources subsidiary [Member] | Eurodollar denominated revolving loan [Member]
Debt Instrument [Line Items]
Interest Rate Terms	Variable	[1]
Increase of additional borrowings on existing and new debt instruments	5
NextEra Energy Resources Subsidiaries [Member] | Eurodollar denominated senior secured limited recourse loan due 2030 [Member]
Debt Instrument [Line Items]
Interest Rate Terms	Variable	[1],[2]
Increase of additional borrowings on existing and new debt instruments	15	[3]
Lone Star [Member] | Senior secured limited-recourse loan [Member]
Debt Instrument [Line Items]
Interest Rate Terms	Variable	[1]
Increase of additional borrowings on existing and new debt instruments	77
Capital Holdings [Member] | Junior subordinated debentures sold in January 2013 [Member]
Debt Instrument [Line Items]
Interest Rate (as a percent)	5.00%
Principal Amount	$ 450

[1] Variable rate is based on an underlying index plus a margin.

[2] Interest rate swap agreements have been entered into with respect to these issuances. See Note 2.

[3] See Note 10 - Commitments for discussion of a default on the senior secured limited-recourse loan.