Summary of Significant Accounting and Reporting Policies (Goodwill and Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill:
Goodwill	$ 149	$ 151
Other intangible assets:
Total	203	198
Less accumulated amortization	(112)	(102)
Total other intangible assets subject to amortization - net	91	96
Intangible assets, amortization [Abstract]
NextEra Energy Resources' amortization expense	13	14	14
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	12
Finite-Lived Intangible Assets, Amortization Expense, Year Two	10
Finite-Lived Intangible Assets, Amortization Expense, Year Three	6
Finite-Lived Intangible Assets, Amortization Expense, Year Four	6
Finite-Lived Intangible Assets, Amortization Expense, Year Five	5
Other intangible assets not subject to amortization, primarily land easements	143	143
Purchased power agreements
Other intangible assets:
Weighted average useful lives (years)	20 years
Total	70	72
Customer lists
Other intangible assets:
Weighted average useful lives (years)	5 years
Total	35	39
Other, primarily transmission and development rights, permits and licenses
Other intangible assets:
Weighted average useful lives (years)	24 years
Total	98	87
Merchant reporting unit
Goodwill:
Goodwill	72	72
Wind reporting unit
Goodwill:
Goodwill	49	51
Fiber-optic telecommunications reporting unit
Goodwill:
Goodwill	$ 28	$ 28