Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Net income		$ 941	$ 890
Other Comprehensive Loss, net of tax
Pension and OPEB adjustments	[1]	2	1
Net unrealized gains (losses) on cash flow hedges	[1]	29	(81)
Reclassification into earnings from cash flow hedges	[1]	3	2
Unrealized (losses) gains on available-for-sale securities	[1]	(8)	1
Other Comprehensive Income (Loss), net of tax	[1]	26	(77)
Comprehensive Income		967	813
Add: Comprehensive Loss Attributable to Noncontrolling Interests		44	62
Comprehensive Income Attributable to Duke Energy		1,011	875
Less: Preferred Dividends		39	39
Comprehensive Income Available to Duke Energy Corporation Common Stockholders		$ 972	$ 836

[1] Net of income tax impacts of approximately $8 million and $23 million for the three months ended March 31, 2021, and 2020, respectively.