Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 2,676	$ 1,782	$ 1,714
Other Comprehensive Income(Loss), Net of Tax [Abstract]
Foreign currency translation adjustments	(197)	(75)	(149)
Pension and OPEB adjustments	38	19	(49)
Net unrealized gain (loss) on cash flow hedges	59	(28)	(57)
Reclassification into earnings from cash flow hedges	1	(1)	4
Unrealized gain (loss) on investments in available for sale securities	(4)	14	12
Reclassification into earnings from available for sale securities	4	(5)	(4)
Other Comprehensive Income (Loss), Net of Tax	(99)	(76)	(243)
Comprehensive Income	2,577	1,706	1,471
Less: Comprehensive Income Attributable to Noncontrolling Interests	5	10	1
Comprehensive Income Attributable to Duke Energy Corporation	$ 2,572	$ 1,696	$ 1,470