Employee Retirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Pension Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Service cost	$ 18	$ 16	$ 36	$ 32
Interest cost	25	26	49	51
Expected return on plan assets	(64)	(60)	(127)	(120)
Amortization of prior service cost (benefit)	1	0	1	1
Amortization of losses	0	0	0	0
Net periodic benefit (income) cost	(20)	(18)	(41)	(36)
Other Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Service cost	0	1	1	2
Interest cost	4	4	7	8
Expected return on plan assets	(1)	(1)	(1)	(1)
Amortization of prior service cost (benefit)	(1)	0	(1)	(1)
Amortization of losses	1	0	1	0
Net periodic benefit (income) cost	3	4	7	8
FPL [Member] | Pension Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Net periodic benefit (income) cost	(13)	(12)	(26)	(23)
FPL [Member] | Other Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Net periodic benefit (income) cost	$ 2	$ 3	$ 5	$ 6