Summary of Significant Accounting and Reporting Policies (Goodwill and Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill:
Goodwill	$ 147	$ 149
Other intangible assets not subject to amortization, primarily land easements	143	143
Other intangible assets:
Total	487	203
Less accumulated amortization	(125)	(112)
Total other intangible assets subject to amortization - net	362	91
Intangible assets, amortization [Abstract]
NextEra Energy Resources' amortization expense	15	13	14
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	14
Finite-Lived Intangible Assets, Amortization Expense, Year Two	24
Finite-Lived Intangible Assets, Amortization Expense, Year Three	20
Finite-Lived Intangible Assets, Amortization Expense, Year Four	19
Finite-Lived Intangible Assets, Amortization Expense, Year Five	17
Purchased power agreements
Other intangible assets:
Weighted average useful lives (years)	22 years
Total	348	70
Customer lists
Other intangible assets:
Weighted average useful lives (years)	5 years
Total	34	35
Other, primarily transmission and development rights, permits and licenses
Other intangible assets:
Weighted average useful lives (years)	24 years
Total	105	98
Merchant reporting unit
Goodwill:
Goodwill	72	72
Wind reporting unit
Goodwill:
Goodwill	47	49
Fiber-optic telecommunications reporting unit
Goodwill:
Goodwill	$ 28	$ 28