Condensed Consolidated Statements Of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Operating Revenues
Regulated electric	$ 4,889		$ 2,501
Non-regulated electric, natural gas, and other	824		958
Regulated natural gas	185		171
Total operating revenues	5,898		3,630
Operating Expenses
Fuel used in electric generation and purchased power - regulated	1,703		777
Fuel used in electric generation and purchased power - non-regulated	454		448
Cost of natural gas and coal sold	104		102
Operation, maintenance and other	1,421		746
Depreciation and amortization	660		479
Property and other taxes	343		184
Impairment charges	0		402
Total operating expenses	4,685		3,138
Gains (Losses) on Sales of Other Assets and Other, net	2		3
Operating Income	1,215		495
Other Income and Expenses
Equity in earnings of unconsolidated affiliates	36		45
Impairments and gains on sales of unconsolidated affiliates	0		(5)
Other income and expenses, net	80		89
Total other income and expenses	116		129
Interest Expense	367		224
Income From Continuing Operations Before Income Taxes	964		400
Income Tax Expense or Benefit from Continuing Operations	330		103
Income (Loss) from Continuing Operations	634		297
Income (Loss) From Discontinued Operations, net of tax	0		2
Net Income	634		299
Less: Net Income (Loss) Attributable to Noncontrolling Interests	0		4
Net Income Attributable to Duke Energy Corporation	634		295
Net Income Available to Parent	634
Other Comprehensive Income(Loss), Net of Tax
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]
Other comprehensive income (loss), net of tax	17		60
Comprehensive income	651		359
Less: Comprehensive Income Attributable to Noncontrolling Interests			4
Comprehensive income	651		355
Income from continuing operations attributable to Duke Energy Corporation common shareholders
Basic	$ 0.89		$ 0.65
Diluted	$ 0.89		$ 0.65
Income (loss) from discontinued operations attributable To Duke Energy Corporation common shareholders
Basic	$ 0		$ 0.01
Diluted	$ 0		$ 0.01
Net income attributable to Duke Energy Corporation common shareholders
Basic	$ 0.89		$ 0.66
Diluted	$ 0.89		$ 0.66
Dividends declared per share	$ 0.765		$ 0.75
Weighted-average shares outstanding
Basic	705		446
Diluted	705		446
Duke Energy Carolinas [Member]
Operating Revenues
Total operating revenues	1,729		1,501
Operating Expenses
Fuel used in electric generation and purchased power - regulated	518		380
Operation, maintenance and other	457		331
Depreciation and amortization	222		228
Property and other taxes	100		90
Total operating expenses	1,297		1,029
Gains (Losses) on Sales of Other Assets and Other, net	2		3
Operating Income	434		475
Other Income and Expenses
Total other income and expenses	36		39
Interest Expense	82		97
Income From Continuing Operations Before Income Taxes	388		417
Income Tax Expense or Benefit from Continuing Operations	144		151
Net Income	244		266
Progress Energy [Member]
Operating Revenues
Total operating revenues	2,186		2,102
Operating Expenses
Fuel used in electric generation and purchased power - regulated	860		901
Operation, maintenance and other	561		535
Depreciation and amortization	194		166
Property and other taxes	141		138
Total operating expenses	1,756		1,740
Gains (Losses) on Sales of Other Assets and Other, net	0		1
Operating Income	430		363
Other Income and Expenses
Total other income and expenses	23		39
Interest Expense	198		185
Income From Continuing Operations Before Income Taxes	255		217
Income Tax Expense or Benefit from Continuing Operations	101		76
Income (Loss) from Continuing Operations	154		141
Income (Loss) From Discontinued Operations, net of tax	0		11
Net Income	154		152
Less: Net Income (Loss) Attributable to Noncontrolling Interests	1		2
Net Income Attributable to Duke Energy Corporation	153		150
Other Comprehensive Income(Loss), Net of Tax
Reclassification into earnings from pension and OPEB adjustments	1	[4]	1	[4]
Net unrealized gain (loss) on cash flow hedges	1	[5]	2	[5]
Reclassification into earnings from cash flow hedges	0		2	[6]
Other comprehensive income (loss), net of tax	2		5
Comprehensive income	156		157
Duke Energy Progress [Member]
Operating Revenues
Total operating revenues	1,216		1,090
Operating Expenses
Fuel used in electric generation and purchased power - regulated	455		420
Operation, maintenance and other	352		374
Depreciation and amortization	137		134
Property and other taxes	60		56
Total operating expenses	1,004		984
Gains (Losses) on Sales of Other Assets and Other, net	0		1
Operating Income	212		107
Other Income and Expenses
Total other income and expenses	14		20
Interest Expense	48		51
Income From Continuing Operations Before Income Taxes	178		76
Income Tax Expense or Benefit from Continuing Operations	68		24
Net Income	110		52
Less: Preferred Stock Dividend Requirement	0		1
Net Income Available to Parent	110		51
Other Comprehensive Income(Loss), Net of Tax
Net unrealized gain (loss) on cash flow hedges	0	[6]	3	[6]
Reclassification into earnings from cash flow hedges	0	[7]	2	[7]
Other comprehensive income (loss), net of tax	0		5
Comprehensive income	110		57
Duke Energy Florida [Member]
Operating Revenues
Total operating revenues	968		1,010
Operating Expenses
Fuel used in electric generation and purchased power - regulated	405		481
Operation, maintenance and other	211		165
Depreciation and amortization	52		27
Property and other taxes	79		83
Total operating expenses	747		756
Gains (Losses) on Sales of Other Assets and Other, net	0		1
Operating Income	221		255
Other Income and Expenses
Total other income and expenses	8		9
Interest Expense	49		63
Income From Continuing Operations Before Income Taxes	180		201
Income Tax Expense or Benefit from Continuing Operations	70		73
Net Income	110		128
Less: Preferred Stock Dividend Requirement	0		1
Net Income Available to Parent	110		127
Other Comprehensive Income(Loss), Net of Tax
Net unrealized gain (loss) on cash flow hedges	0		1	[8]
Other comprehensive income (loss), net of tax			1
Comprehensive income	110		129
Duke Energy Ohio [Member]
Operating Revenues
Regulated electric	333		324
Non-regulated electric, natural gas, and other	228		417
Regulated natural gas	186		171
Total operating revenues	747		912
Operating Expenses
Fuel used in electric generation and purchased power - regulated	103		114
Fuel used in electric generation and purchased power - non-regulated	240		239
Cost of natural gas and coal sold	76		75
Operation, maintenance and other	185		196
Depreciation and amortization	88		83
Property and other taxes	72		68
Total operating expenses	764		775
Gains (Losses) on Sales of Other Assets and Other, net	0		1
Operating Income	(17)		138
Other Income and Expenses
Total other income and expenses	2		4
Interest Expense	18		24
Income From Continuing Operations Before Income Taxes	(33)		118
Income Tax Expense or Benefit from Continuing Operations	(12)		44
Net Income	(21)		74
Other Comprehensive Income(Loss), Net of Tax
Pension and OPEB related adjustments	1	[4]	1	[4]
Other comprehensive income (loss), net of tax	1		1
Comprehensive income	(20)		75
Duke Energy Indiana [Member]
Operating Revenues
Total operating revenues	724		688
Operating Expenses
Fuel used in electric generation and purchased power - regulated	293		283
Operation, maintenance and other	150		160
Depreciation and amortization	78		96
Property and other taxes	22		21
Impairment charges	0		400
Total operating expenses	543		960
Operating Income	181		(272)
Other Income and Expenses
Total other income and expenses	4		23
Interest Expense	41		34
Income From Continuing Operations Before Income Taxes	144		(283)
Income Tax Expense or Benefit from Continuing Operations	54		(116)
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	$ 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 2013 and 2012.

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

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

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

[8] Net of insignificant tax expense in 2012.

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