Common Shareholders' Equity (Accumulated Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012
Components Of Comprehensive Income And Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	$ (136)			$ (255)
Other comprehensive income (loss) before reclassifications	20			123
Amounts reclassified from AOCI	14			30
Net other comprehensive income (loss)	34		(96)	153		(36)
Ending balance	(102)			(102)
Net Unrealized Gains (Losses) on Cash Flow Hedges
Components Of Comprehensive Income And Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(180)			(266)
Other comprehensive income (loss) before reclassifications	36			101
Amounts reclassified from AOCI	18	[1]		39	[1]
Net other comprehensive income (loss)	54			140
Ending balance	(126)			(126)
Net Unrealized Gains (Losses) on Available for Sale Securities
Components Of Comprehensive Income And Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	130			96
Other comprehensive income (loss) before reclassifications	2			42
Amounts reclassified from AOCI	(4)	[2]		(10)	[2]
Net other comprehensive income (loss)	(2)			32
Ending balance	128			128
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	3			12
Other comprehensive income (loss) before reclassifications	(23)			(32)
Amounts reclassified from AOCI	0			0
Net other comprehensive income (loss)	(23)			(32)
Ending balance	(20)			(20)
Other Comprehensive Income (Loss) Related to Equity Method Investee
Components Of Comprehensive Income And Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(22)			(23)
Other comprehensive income (loss) before reclassifications	5			6
Amounts reclassified from AOCI	0			0
Net other comprehensive income (loss)	5			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.