Income Taxes (Schedule Of Income Before Income Taxes, Domestic And Foreign) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Line Items]
Domestic	$ 1,827	$ 1,780	$ 1,731
Foreign	624	685	479
Income Loss From Continuing Operations Before Income Taxes	2,451	2,465	2,210
Parent Company [Member]
Income Tax Disclosure [Line Items]
Income Loss From Continuing Operations Before Income Taxes	1,636	1,641	1,199
Duke Energy Carolinas [Member]
Income Tax Disclosure [Line Items]
Income Loss From Continuing Operations Before Income Taxes	1,318	1,306	1,295
Progress Energy [Member]
Income Tax Disclosure [Line Items]
Income Loss From Continuing Operations Before Income Taxes	527	910	1,406
Progress Energy Carolinas [Member]
Income Tax Disclosure [Line Items]
Income Loss From Continuing Operations Before Income Taxes	382	772	952
Progress Energy Florida [Member]
Income Tax Disclosure [Line Items]
Income Loss From Continuing Operations Before Income Taxes	413	494	729
Duke Energy Ohio [Member]
Income Tax Disclosure [Line Items]
Income Loss From Continuing Operations Before Income Taxes	273	290	(309)
Duke Energy Indiana [Member]
Income Tax Disclosure [Line Items]
Income Loss From Continuing Operations Before Income Taxes	$ (123)	$ 242	$ 441