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Business Segments (Net Loss) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Segment income	$ 2,451	$ 2,574	$ 1,593
Duke Energy Carolinas [Member] \| Other Segment [Member]
Segment Reporting Information [Line Items]
Segment income	(79)	(97)	(169)
Progress Energy [Member]
Segment Reporting Information [Line Items]
Segment income	875	656	348
Progress Energy [Member] \| Other Segment [Member]
Segment Reporting Information [Line Items]
Segment income	(190)	(241)	(379)
Duke Energy Progress [Member] \| Other Segment [Member]
Segment Reporting Information [Line Items]
Segment income	(31)	(46)	(139)
Duke Energy Florida [Member] \| Other Segment [Member]
Segment Reporting Information [Line Items]
Segment income	(19)	(24)	(58)
Duke Energy Indiana [Member] \| Other Segment [Member]
Segment Reporting Information [Line Items]
Segment income	$ (11)	$ (16)	$ (27)

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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