Condensed Consolidated Statements Of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Net Income	$ 634		$ 299
Other Comprehensive Income(Loss), Net of Tax
Foreign currency translation adjustments	4		44
Pension and OPEB related adjustments	3	[1]	4	[1]
Net unrealized gain (loss) on cash flow hedges	10	[2]	13	[2]
Reclassification into earnings from cash flow hedges			(1)	[3]
Unrealized gain (loss) on investments in available for sale securities			1	[4]
Reclassification into earnings from available for sale securities			(1)	[4]
Other Comprehensive Income (Loss), Net of Tax	17		60
Comprehensive Income	651		359
Less: Comprehensive Income Attributable to Noncontrolling Interests			4
Comprehensive Income Attributable to Duke Energy Corporation	651		355
Duke Energy Carolinas [Member]
Net Income	244		266
Progress Energy [Member]
Net Income	154		152
Other Comprehensive Income(Loss), Net of Tax
Reclassification into earnings from pension and OPEB adjustments	1	[5]	1	[5]
Net unrealized gain (loss) on cash flow hedges	1	[6]	2	[6]
Reclassification into earnings from cash flow hedges	0		2	[7]
Other Comprehensive Income (Loss), Net of Tax	2		5
Comprehensive Income	156		157
Duke Energy Progress [Member]
Net Income	110		52
Other Comprehensive Income(Loss), Net of Tax
Net unrealized gain (loss) on cash flow hedges	0	[7]	3	[7]
Reclassification into earnings from cash flow hedges	0	[8]	2	[8]
Other Comprehensive Income (Loss), Net of Tax	0		5
Comprehensive Income	110		57
Duke Energy Florida [Member]
Net Income	110		128
Other Comprehensive Income(Loss), Net of Tax
Net unrealized gain (loss) on cash flow hedges	0		1	[4]
Other Comprehensive Income (Loss), Net of Tax			1
Comprehensive Income Attributable to Duke Energy Corporation	110		129
Duke Energy Ohio [Member]
Net Income	(21)		74
Other Comprehensive Income(Loss), Net of Tax
Pension and OPEB related adjustments	1	[5]	1	[5]
Other Comprehensive Income (Loss), Net of Tax	1		1
Comprehensive Income Attributable to Duke Energy Corporation	(20)		75
Duke Energy Indiana [Member]
Net Income	90		(167)
Other Comprehensive Income(Loss), Net of Tax
Reclassification into earnings from cash flow hedges	0	[9]	(1)	[9]
Other Comprehensive Income (Loss), Net of Tax			(1)
Comprehensive Income Attributable to Duke Energy Corporation	$ 90		$ (168)

[1] Net of $1 million tax expense in 2013 and $2 million tax expense in 2012.

[2] Net of $4 million tax expense in 2013 and $5 million tax expense in 2012.

[3] Net of $1 million tax expense in 2013 and insignificant tax expense in 2012.

[4] Net of insignificant tax expense in 2012.

[5] Net of insignificant tax expense in 2013 and 2012.

[6] Net of insignificant tax expense in 2013 and $2 million tax expense in 2012.

[7] Net of $2 million tax expense in 2012.

[8] Net of $1 million tax expense in 2012.

[9] Net of $1 million tax benefit in 2013 and insignificant tax benefit in 2012.