Common Shareholders' Equity (Accumulated Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Components Of Comprehensive Income And Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	$ 56		$ (255)
Other comprehensive income (loss) before reclassifications	(20)		103
Amounts reclassified from AOCI	(15)		16
Net other comprehensive income (loss)	(35)		119
Ending balance	21		(136)
Net Unrealized Gains (Losses) on Available for Sale Securities
Components Of Comprehensive Income And Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	197		96
Other comprehensive income (loss) before reclassifications	13		40
Amounts reclassified from AOCI	(25)	[1]	(6)	[1]
Net other comprehensive income (loss)	(12)		34
Ending balance	185		130
Net Unrealized Gains (Losses) on Cash Flow Hedges
Components Of Comprehensive Income And Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(115)		(266)
Other comprehensive income (loss) before reclassifications	(18)		65
Amounts reclassified from AOCI	9	[2]	21	[2]
Net other comprehensive income (loss)	(9)		86
Ending balance	(124)		(180)
Defined Benefit Pension and Other Benefits Plans
Components Of Comprehensive Income And Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	23		(74)
Other comprehensive income (loss) before reclassifications	4		6
Amounts reclassified from AOCI	1		1
Net other comprehensive income (loss)	5		7
Ending balance	28		(67)
Net Unrealized Gains (Losses) on Foreign Currency Translation
Components Of Comprehensive Income And Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(33)		12
Other comprehensive income (loss) before reclassifications	(17)		(9)
Amounts reclassified from AOCI	0		0
Net other comprehensive income (loss)	(17)		(9)
Ending balance	(50)		3
Other Comprehensive Income (Loss) Related to Equity Method Investee
Components Of Comprehensive Income And Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(16)		(23)
Other comprehensive income (loss) before reclassifications	(2)		1
Amounts reclassified from AOCI	0		0
Net other comprehensive income (loss)	(2)		1
Ending balance	$ (18)		$ (22)

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

[2] Reclassified to interest expense and other - net in NEE's condensed consolidated statements of income. See Note 2 - Income Statement Impact of Derivative Instruments.