Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total		Preferred Stock	Common Stockholders' Equity		Common Stock	Additional Paid-in Capital		Retained Earnings		Accumulated Other Comprehensive (Loss) Income, Net (Losses) Gains on Cash Flow Hedges		Accumulated Other Comprehensive (Loss) Income, Net Unrealized (Losses) Gains on Available-for-Sale-Securities		Accumulated Other Comprehensive (Loss) Income, Pension and OPEB Adjustments		Noncontrolling Interests		Duke Energy Carolinas		Duke Energy Carolinas Member's Equity		Duke Energy Carolinas Accumulated Other Comprehensive (Loss) Income, Net (Losses) Gains on Cash Flow Hedges		Progress Energy	Progress Energy Common Stockholders' Equity	Progress Energy Additional Paid-in Capital	Progress Energy Retained Earnings		Progress Energy Accumulated Other Comprehensive (Loss) Income, Net (Losses) Gains on Cash Flow Hedges		Progress Energy Accumulated Other Comprehensive (Loss) Income, Net Unrealized (Losses) Gains on Available-for-Sale-Securities	Progress Energy Accumulated Other Comprehensive (Loss) Income, Pension and OPEB Adjustments		Progress Energy Noncontrolling Interests	Duke Energy Progress	Duke Energy Progress Member's Equity	Duke Energy Florida	Duke Energy Florida Member's Equity	Duke Energy Florida Accumulated Other Comprehensive (Loss) Income, Net Unrealized (Losses) Gains on Available-for-Sale-Securities	Duke Energy Ohio	Duke Energy Ohio Common Stock	Duke Energy Ohio Additional Paid-in Capital	Duke Energy Ohio Retained Earnings	Duke Energy Indiana	Duke Energy Indiana Member's Equity	Piedmont Natural Gas	Piedmont Natural Gas Common Stock	Piedmont Natural Gas Retained Earnings	Preferred stock, Series A		Preferred stock, Series A Preferred Stock		Preferred stock, Series A Common Stockholders' Equity	[1]	Preferred stock, Series B	Common Stock	Common Stock Common Stockholders' Equity	Common Stock Common Stock	Common Stock Additional Paid-in Capital
Beginning Balance at Dec. 31, 2018	$ 43,834			$ 43,817		$ 1	$ 40,795		$ 3,113		$ (14)		$ (3)		$ (75)		$ 17								$ 14,257	$ 14,254	$ 9,143	$ 5,131		$ (12)		$ (1)	$ (7)		$ 3
Beginning Balance, in shares at Dec. 31, 2018						727,000,000
Beginning Balance (member's equity) at Dec. 31, 2018																			$ 11,683		$ 11,689		$ (6)														$ 8,441	$ 6,095	$ 6,097	$ (2)						$ 4,339
Beginning Balance (parent) at Dec. 31, 2018																																									$ 3,445	$ 762	$ 2,776	$ (93)			$ 2,091	$ 1,160	$ 931
Net income (attributable to parent)	900																		293		293				249											$ 203	203	96	96		69			69	$ 110	110	122		122
Net Income	893																								248	249		249							(1)
Net income	893			900					900								(7)
Other comprehensive income (loss)	(12)			(12)							(16)		4												3	3				2			1					1		1
Stock issuances																																																		$ 974	[1]	$ 974	[1]	$ 974			$ 28	$ 28		$ 28
Stock issuances, in shares																																																				40,000,000							1,000,000
Common stock dividends	(676)			(676)					(676)
Other	4	[2]		(1)	[2]				23	[2]	(6)	[2]	(1)	[2]	(17)	[2]	5	[2]	(1)				(1)					6	[3]	(4)	[3]		(2)	[3]
Ending Balance at Mar. 31, 2019	45,045		$ 974	45,030		$ 1	40,823		3,360		(36)				(92)		15								14,508	14,506	9,143	5,386		(14)		(1)	(8)		2
Ending Balance, in shares at Mar. 31, 2019						728,000,000
Ending Balance (member's equity) at Mar. 31, 2019																			11,975		11,982		(7)														8,644	6,192	6,193	(1)						4,449
Ending Balance (parent) at Mar. 31, 2019																																									$ 3,514	762	2,776	(24)			$ 2,213	1,160	1,053
Beginning Balance at Dec. 31, 2019	$ 47,951		1,962	46,822		$ 1	40,881		4,108		(51)		3		(82)		1,129								$ 15,593	15,590	9,143	6,465		(10)		(1)	(7)		3
Beginning Balance, in shares at Dec. 31, 2019	733,000,000					733,000,000																			100																90,000,000						100
Beginning Balance, in shares at Dec. 31, 2019																																																		40,000,000						1,000,000
Beginning Balance (member's equity) at Dec. 31, 2019																			12,811		12,818		(7)													9,246	9,246	6,788	6,789	(1)					4,575	4,575
Beginning Balance (parent) at Dec. 31, 2019	$ 46,822																								$ 15,590																$ 3,683	762	2,776	145			$ 2,443	1,310	1,133
Net income (attributable to parent)	938																		339		339				283											204	204	120	120		$ 65			65	99	99	178		178
Net Income	890																								283	283		283
Net income	851			899					899								(48)
Other comprehensive income (loss)	(77)	[4]		(63)							(65)		1		1		(14)								2	2				1		$ 1						1		$ 1
Stock issuances																																																									$ 50	$ 50		$ 50
Stock issuances, in shares																																																											2,000,000
Common stock dividends	(695)			(695)					(695)										(300)		(300)
Contribution from noncontrolling interest in subsidiaries	103																103
Distributions to noncontrolling interest in subsidiaries	(7)																(7)
Other	(93)	[5]		(92)	[5]		(1)	[5]	(91)	[5]							(1)	[5]	(13)	[6]	(13)	[6]	0	[6]	(1)	(1)		(1)																			$ (1)		(1)
Ending Balance at Mar. 31, 2020	$ 48,083		$ 1,962	$ 46,921		$ 1	$ 40,930		$ 4,221		$ (116)		$ 4		$ (81)		$ 1,162								$ 15,877	$ 15,874	$ 9,143	$ 6,747		$ (9)			$ (7)		$ 3
Ending Balance, in shares at Mar. 31, 2020																																																		40,000,000						1,000,000
Ending Balance, in shares at Mar. 31, 2020	735,000,000					735,000,000																			100																90,000,000						100
Ending Balance (member's equity) at Mar. 31, 2020																			$ 12,837		$ 12,844		$ (7)													$ 9,450	$ 9,450	$ 6,909	$ 6,909						$ 4,674	$ 4,674
Ending Balance (parent) at Mar. 31, 2020	$ 46,921																								$ 15,874																$ 3,748	$ 762	$ 2,776	$ 210			$ 2,620	$ 1,310	$ 1,310

[1] Duke Energy issued 40 million depositary shares of preferred stock, Series A.

[2] Amounts in Retained Earnings and Accumulated Other Comprehensive (Loss) Income primarily represent impacts to accumulated other comprehensive income due to implementation of a new accounting standard related to Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.

[3] Amounts in Retained Earnings and Accumulated Other Comprehensive Loss primarily represent impacts to accumulated other comprehensive income due to implementation of a new accounting standard related to Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.

[4] Net of income tax impact of approximately $23 million in the first quarter of 2020 and immaterial income tax impact in the first quarter of 2019.

[5] Amounts in Retained earnings primarily represent impacts due to implementation of a new accounting standard related to Current Estimated Credit Losses. See Note 1 for additional discussion.

[6] Amounts primarily represent impacts due to implementation of a new accounting standard related to Current Estimated Credit Losses. See Note 1 for additional discussion.