Fair Value Measurements (Reconciliation of Changes in the Fair Value of Derivatives) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Realized and unrealized gains (losses): [Abstract]
Realized and unrealized gains (losses) reflected in operating revenues	$ (49)				$ (453)		$ 1
Realized and unrealized gains (losses) reflected in interest expense			11		(41)		11
Unrealized gains (losses) reflected in operating revenues related to derivatives still held at the reporting date	(49)				(219)		32
Unrealized gains (losses) reflected in interest expense related to derivatives still held at the reporting date			11				11
Derivative Financial Instruments, Net [Member]
Reconciliation of changes in the fair value of derivatives measured based on significant unobservable inputs Roll Forward [Abstract]
Fair value of net derivatives based on significant unobservable inputs, beginning balance	460		522		622		566
Realized and unrealized gains (losses): [Abstract]
Included in Earnings	(73)	[1]	13	[1]	(496)	[2]	10	[2]
Included in regulatory assets and liabilities	1		(3)		5		(2)
Purchases	10		21		14		70
Settlements	38		(23)		304		(56)
Issuances	(75)		(30)		(94)		(94)
Transfers in	9	[3]	(114)	[3]	16	[3]	(114)	[3]
Transfers out	(16)	[3]	(2)	[3]	(17)	[3]	4	[3]
Fair value of net derivatives based on significant unobservable inputs, ending balance	354		384		354		384
The amount of gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to derivatives still held at the reporting date	(73)	[4]	12	[4]	(260)	[5]	40	[5]
FPL [Member] | Derivative Financial Instruments, Net [Member]
Reconciliation of changes in the fair value of derivatives measured based on significant unobservable inputs Roll Forward [Abstract]
Fair value of net derivatives based on significant unobservable inputs, beginning balance	3		2		0		2
Realized and unrealized gains (losses): [Abstract]
Included in Earnings	0	[1]	0	[1]	0	[2]	0	[2]
Included in regulatory assets and liabilities	1		(3)		5		(2)
Purchases	0		0		0		0
Settlements	(1)		0		(2)		(1)
Issuances	0		0		0		0
Transfers in	0	[3]	0	[3]	0	[3]	0	[3]
Transfers out	0	[3]	0	[3]	0	[3]	0	[3]
Fair value of net derivatives based on significant unobservable inputs, ending balance	3		(1)		3		(1)
The amount of gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to derivatives still held at the reporting date	$ 0	[4]	$ 0	[4]	$ 0	[5]	$ 0	[5]

[1] For the three months ended June 30, 2014, realized and unrealized losses of approximately $49 million are reflected in the condensed consolidated statements of income in operating revenues and the balance is reflected in interest expense. For the three months ended June 30, 2013, realized and unrealized gains of approximately $11 million are reflected in the condensed consolidated statements of income in interest expense and the balance is reflected in operating revenues.

[2] For the six months ended June 30, 2014, realized and unrealized losses of approximately $453 million are reflected in the condensed consolidated statements of income in operating revenues, $41 million in interest expense and the balance is reflected in fuel, purchased power and interchange. For the six months ended June 30, 2013, realized and unrealized gains (losses) of approximately $11 million are reflected in the condensed consolidated statements of income in interest expense, $1 million in operating revenues and the balance is reflected in fuel, purchased power and interchange.

[3] Transfers into Level 3 were a result of decreased observability of market data and, in 2013, a significant credit valuation adjustment. Transfers from Level 3 to Level 2 were a result of increased observability of market data. NEE's and FPL's policy is to recognize all transfers at the beginning of the reporting period.

[4] For the three months ended June 30, 2014, unrealized losses of approximately $49 million are reflected in the condensed consolidated statements of income in operating revenues and the balance is reflected in interest expense. For the three months ended June 30, 2013, unrealized gains of approximately $11 million are reflected in the condensed consolidated statements of income in interest expense and the balance is reflected in operating revenues.

[5] For the six months ended June 30, 2014, unrealized losses of approximately $219 million are reflected in the condensed consolidated statements of income in operating revenues and the balance is reflected in interest expense. For the six months ended June 30, 2013, unrealized gains (losses) of approximately $32 million are reflected in the condensed consolidated statements of income in operating revenues, $11 million in interest expense and the balance is reflected in fuel, purchased power and interchange.