Severance Rollforward (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Restructuring Reserve [Roll Forward]
Balance, beginning of period	$ 135
Provision/adjustments	52
Cash reductions	(123)
Balance, end of period	64
Duke Energy Carolinas [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period	12
Provision/adjustments	6
Cash reductions	(13)
Balance, end of period	5
Progress Energy [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period	43
Provision/adjustments	49
Cash reductions	(48)
Balance, end of period	44
Duke Energy Progress [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period	23
Provision/adjustments	8
Cash reductions	(20)
Balance, end of period	11
Duke Energy Florida [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of period	6
Provision/adjustments	31
Cash reductions	(13)
Balance, end of period	$ 24