Common Shareholders' Equity (Accumulated Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Components Of Comprehensive Income And Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	$ (102)			$ (255)
Other comprehensive income (loss) before reclassifications	18			141
Amounts reclassified from AOCI	2			32
Net other comprehensive income (loss)	20		(29)	173		(65)
Ending balance	(82)			(82)
Net Unrealized Gains (Losses) on Cash Flow Hedges
Components Of Comprehensive Income And Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(126)			(266)
Other comprehensive income (loss) before reclassifications	(18)			83
Amounts reclassified from AOCI	9	[1]		48	[1]
Net other comprehensive income (loss)	(9)			131
Ending balance	(135)			(135)
Net Unrealized Gains (Losses) on Available for Sale Securities
Components Of Comprehensive Income And Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	128			96
Other comprehensive income (loss) before reclassifications	30			72
Amounts reclassified from AOCI	(7)	[2]		(17)	[2]
Net other comprehensive income (loss)	23			55
Ending balance	151			151
Defined Benefit Pension and Other Benefits Plans
Components Of Comprehensive Income And Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(67)			(74)
Other comprehensive income (loss) before reclassifications	0			6
Amounts reclassified from AOCI	0			1
Net other comprehensive income (loss)	0			7
Ending balance	(67)			(67)
Net Unrealized Gains (Losses) on Foreign Currency Translation
Components Of Comprehensive Income And Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(20)			12
Other comprehensive income (loss) before reclassifications	6			(26)
Amounts reclassified from AOCI	0			0
Net other comprehensive income (loss)	6			(26)
Ending balance	(14)			(14)
Other Comprehensive Income (Loss) Related to Equity Method Investee
Components Of Comprehensive Income And Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(17)			(23)
Other comprehensive income (loss) before reclassifications	0			6
Amounts reclassified from AOCI	0			0
Net other comprehensive income (loss)	0			6
Ending balance	$ (17)			$ (17)

[1] Reclassified to interest expense in NEE's condensed consolidated statements of income.

[2] Reclassified to gains on disposal of assets - net in NEE's condensed consolidated statements of income.