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Business Segments (Net Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Segment income	$ 773	$ 746
Interest expense	403us-gaap_InterestExpense	404us-gaap_InterestExpense
Duke Energy Carolinas [Member]
Segment Reporting Information [Line Items]
Interest expense	102	101
Duke Energy Carolinas [Member] \| Other [Member]
Segment Reporting Information [Line Items]
Segment income	(8)	(21)
Progress Energy [Member]
Segment Reporting Information [Line Items]
Interest expense	168	169
Progress Energy [Member] \| Other [Member]
Segment Reporting Information [Line Items]
Segment income	(42)	(52)
Interest expense	60	63
Duke Energy Progress [Member]
Segment Reporting Information [Line Items]
Interest expense	60	57
Duke Energy Progress [Member] \| Other [Member]
Segment Reporting Information [Line Items]
Segment income	(4)	(10)
Duke Energy Florida [Member]
Segment Reporting Information [Line Items]
Interest expense	49	49
Duke Energy Florida [Member] \| Other [Member]
Segment Reporting Information [Line Items]
Segment income	(3)	(4)
Duke Energy Ohio [Member]
Segment Reporting Information [Line Items]
Segment income	59	(15)
Interest expense	20	20
Duke Energy Indiana [Member]
Segment Reporting Information [Line Items]
Interest expense	45	43
Duke Energy Indiana [Member] \| Other [Member]
Segment Reporting Information [Line Items]
Segment income	$ (2)	$ (3)

Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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