Other Income & Expenses (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Component Of Other Income Expense Nonoperating [Line Items]
Interest income	$ 26	$ 50	$ 53
Foreign exchange gains (losses)	(18)	(5)	2
Equity component of AFUDC	157	300	260
Deferred returns	39	24	10
Other income (expense)	58	28	51
Other income and expenses, net	262	397	376
Duke Energy Carolinas [Member]
Component Of Other Income Expense Nonoperating [Line Items]
Interest income	1	11	10
Equity component of AFUDC	91	154	168
Deferred returns	32	24	10
Other income (expense)	(4)	(4)	(2)
Other income and expenses, net	120	185	186
Progress Energy [Member]
Component Of Other Income Expense Nonoperating [Line Items]
Interest income	7	2	2
Contingent value obligations mark-to-market loss			(59)
Equity component of AFUDC	50	106	103
Deferred returns	7
Other income (expense)	30	22	6
Other income and expenses, net	94	130	52
Duke Energy Progress [Member]
Component Of Other Income Expense Nonoperating [Line Items]
Interest income	1	1	1
Equity component of AFUDC	42	69	71
Deferred returns	7
Other income (expense)	7	9	8
Other income and expenses, net	57	79	80
Duke Energy Florida [Member]
Component Of Other Income Expense Nonoperating [Line Items]
Interest income	3	1	1
Equity component of AFUDC	8	37	32
Other income (expense)	19	1	(3)
Other income and expenses, net	30	39	30
Duke Energy Ohio [Member]
Component Of Other Income Expense Nonoperating [Line Items]
Interest income	6	10	14
Equity component of AFUDC	1	6	5
Other income (expense)	(3)	(3)	0
Other income and expenses, net	4	13	19
Duke Energy Indiana [Member]
Component Of Other Income Expense Nonoperating [Line Items]
Interest income	6	7	14
Equity component of AFUDC	15	84	88
Other income (expense)	(3)	(1)	(5)
Other income and expenses, net	$ 18	$ 90	$ 97