Income Taxes (Deferred Income Taxes) (Details) (USD $)								12 Months Ended								12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2013 Minimum [Member]	Dec. 31, 2013 Maximum [Member]	Dec. 31, 2013 Investment Tax Credits [Member]	Dec. 31, 2013 Investment Tax Credits [Member] Minimum [Member]	Dec. 31, 2013 Investment Tax Credits [Member] Maximum [Member]	Dec. 31, 2013 Alternative Minimum Tax Credit [Member]	Dec. 31, 2013 NOL Carryforwards [Member] Federal [Member]	Dec. 31, 2013 NOL Carryforwards [Member] State [Member]		Dec. 31, 2013 NOL Carryforwards [Member] Foreign [Member]		Dec. 31, 2013 NOL Carryforwards [Member] Minimum [Member] Federal [Member]	Dec. 31, 2013 NOL Carryforwards [Member] Minimum [Member] State [Member]	Dec. 31, 2013 NOL Carryforwards [Member] Minimum [Member] Foreign [Member]	Dec. 31, 2013 NOL Carryforwards [Member] Maximum [Member] Federal [Member]	Dec. 31, 2013 NOL Carryforwards [Member] Maximum [Member] State [Member]	Dec. 31, 2013 NOL Carryforwards [Member] Maximum [Member] Foreign [Member]	Dec. 31, 2013 Duke Energy Carolinas [Member]	Dec. 31, 2012 Duke Energy Carolinas [Member]	Dec. 31, 2013 Progress Energy [Member]	Dec. 31, 2012 Progress Energy [Member]	Dec. 31, 2013 Duke Energy Progress [Member]	Dec. 31, 2012 Duke Energy Progress [Member]	Dec. 31, 2013 Duke Energy Florida [Member]	Dec. 31, 2012 Duke Energy Florida [Member]	Dec. 31, 2013 Duke Energy Ohio [Member]	Dec. 31, 2012 Duke Energy Ohio [Member]	Dec. 31, 2013 Duke Energy Indiana [Member]	Dec. 31, 2012 Duke Energy Indiana [Member]
Deferred Tax Assets, Gross [Abstract]
Deferred credits and other liabilities	$ 245,000,000		$ 256,000,000																			$ 56,000,000	$ 64,000,000	$ 136,000,000	$ 110,000,000	$ 9,000,000	$ 24,000,000	$ 96,000,000	$ 76,000,000	$ (13,000,000)	$ (10,000,000)	$ 9,000,000	$ 22,000,000
Capital lease obligations	59,000,000		60,000,000																			11,000,000	13,000,000									(2,000,000)	(1,000,000)
Pension, postretirement and other employee benefits	649,000,000		1,320,000,000																			18,000,000	117,000,000	341,000,000	712,000,000	119,000,000	318,000,000	145,000,000	257,000,000	23,000,000	62,000,000	54,000,000	94,000,000
Progress Energy merger purchase accounting adjustments	1,184,000,000	[1]	1,312,000,000	[1]
Tax credits and NOL carryforwards	4,307,000,000		3,311,000,000				498,000,000			1,028,000,000	2,471,000,000	189,000,000	[2]	121,000,000	[3]							488,000,000	447,000,000	1,965,000,000	1,536,000,000	396,000,000	309,000,000	365,000,000	91,000,000	165,000,000	152,000,000	521,000,000	340,000,000
Other	265,000,000		408,000,000																			15,000,000	22,000,000	116,000,000	230,000,000	39,000,000	82,000,000	43,000,000	126,000,000	20,000,000	10,000,000	14,000,000	27,000,000
Valuation allowance	(192,000,000)		(226,000,000)									83,000,000		109,000,000										(40,000,000)	(77,000,000)	(1,000,000)				0	(1,000,000)
Total deferred income tax assets	6,517,000,000		6,441,000,000																			588,000,000	663,000,000	2,518,000,000	2,511,000,000	562,000,000	733,000,000	649,000,000	550,000,000	195,000,000	213,000,000	596,000,000	482,000,000
Deferred Tax Liabilities, Gross [Abstract]
Investments and other assets	(1,396,000,000)		(1,093,000,000)																			(999,000,000)	(838,000,000)	(209,000,000)	(112,000,000)	(160,000,000)	(108,000,000)	(49,000,000)	(6,000,000)	(17,000,000)	(25,000,000)	(7,000,000)	(18,000,000)
Accelerated depreciation rates	(12,615,000,000)		(11,208,000,000)																			(4,400,000,000)	(4,289,000,000)	(3,663,000,000)	(2,803,000,000)	(2,528,000,000)	(2,178,000,000)	(1,160,000,000)	(592,000,000)	(1,937,000,000)	(1,823,000,000)	(1,591,000,000)	(1,131,000,000)
Regulatory assets and deferred debits	(3,185,000,000)		(3,819,000,000)																			(609,000,000)	(627,000,000)	(1,389,000,000)	(1,775,000,000)	(202,000,000)	(465,000,000)	(1,159,000,000)	(1,318,000,000)	(168,000,000)	(197,000,000)	(117,000,000)	(185,000,000)
Total deferred income tax liabilities	(17,196,000,000)		(16,120,000,000)																			(6,008,000,000)	(5,754,000,000)	(5,261,000,000)	(4,690,000,000)	(2,890,000,000)	(2,751,000,000)	(2,368,000,000)	(1,916,000,000)	(2,122,000,000)	(2,045,000,000)	(1,715,000,000)	(1,334,000,000)
Net deferred income tax liabilities	(10,679,000,000)		(9,679,000,000)																			(5,420,000,000)	(5,091,000,000)	(2,743,000,000)	(2,179,000,000)	(2,328,000,000)	(2,018,000,000)	(1,719,000,000)	(1,366,000,000)	(1,927,000,000)	(1,832,000,000)	(1,119,000,000)	(852,000,000)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract]
Tax credits and NOL carryforwards	4,307,000,000		3,311,000,000				498,000,000			1,028,000,000	2,471,000,000	189,000,000	[2]	121,000,000	[3]							488,000,000	447,000,000	1,965,000,000	1,536,000,000	396,000,000	309,000,000	365,000,000	91,000,000	165,000,000	152,000,000	521,000,000	340,000,000
Expiration year								Dec. 31, 2029	Dec. 31, 2033							Dec. 31, 2030	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2033	Dec. 31, 2033	Dec. 31, 2033
Valuation allowance	192,000,000		226,000,000									(83,000,000)		(109,000,000)										40,000,000	77,000,000	1,000,000				0	1,000,000
Classification of Deferred Tax Assets (Liabiliities) in the Consolidated Balance Sheets [Abstract]
Current Assets: Other	1,373,000,000		732,000,000																			286,000,000	90,000,000	540,000,000	359,000,000	229,000,000	144,000,000	110,000,000	152,000,000	85,000,000	21,000,000	52,000,000	1,000,000
Investments and Other Assets: Other	45,000,000		85,000,000																					0	20,000,000
Current Liabilities: Other	0		(6,000,000)
Deferred Credits and Other Liabilities: Other	(12,097,000,000)		(10,490,000,000)																			(5,706,000,000)	(5,181,000,000)	(3,283,000,000)	(2,558,000,000)	(2,557,000,000)	(2,162,000,000)	(1,829,000,000)	(1,518,000,000)	(2,012,000,000)	(1,853,000,000)	(1,171,000,000)	(853,000,000)
Net deferred income tax liabilities	(10,679,000,000)		(9,679,000,000)																			(5,420,000,000)	(5,091,000,000)	(2,743,000,000)	(2,179,000,000)	(2,328,000,000)	(2,018,000,000)	(1,719,000,000)	(1,366,000,000)	(1,927,000,000)	(1,832,000,000)	(1,119,000,000)	(852,000,000)
Undistributed earnings of foreign subsidiaries	2,400,000,000
Deferred tax liabilities, undistributed foreign subsidiaries					$ 300,000,000	$ 375,000,000

[1] Primarily related to capital lease obligations and debt fair value adjustments.

[2] A valuation allowance of $83 million has been recorded on the state NOL carryforwards, state tax credits and state capital loss carryforwards, as presented in the Net Deferred Income Tax Liability Components table.

[3] A valuation allowance of $109 million has been recorded on the foreign NOL carryforwards, as presented in the Net Deferred Income Tax Liability Components table. Certain foreign NOL carryforwards have an indefinite expiration period.