Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income		$ 1,082	$ 3,571	$ 2,644
Other Comprehensive Income, net of tax
Pension and OPEB adjustments	[1]	6	9	(6)
Net unrealized losses on cash flow hedges	[1]	(138)	(47)	(10)
Reclassification into earnings from cash flow hedges	[1]	11	6	6
Unrealized gains (losses) on available-for-sale securities	[1]	3	8	(3)
Other Comprehensive Loss, net of tax	[1]	(118)	(24)	(13)
Comprehensive Income		964	3,547	2,631
Add: Comprehensive Loss Attributable to Noncontrolling Interests		306	177	22
Comprehensive Income Attributable to Duke Energy Corporation		1,270	3,724	2,653
Less: Preferred Dividends		107	41
Comprehensive Income		1,163	$ 3,683	$ 2,653
Other comprehensive income (loss), tax		$ 35

[1] Net of income tax impacts of approximately $35 million for the year ended December 31, 2020. Tax impacts are immaterial for other periods presented.