Investments in Unconsolidated Affiliates (Tables)

12 Months Ended

Dec. 31, 2019

Equity Method Investments and Joint Ventures [Abstract]

Investments in Equity Method Unconsolidated Affiliates

The following table presents Duke Energy’s investments in unconsolidated affiliates accounted for under the equity method, as well as the respective equity in earnings, by segment.

	Years Ended December 31,
	2019					2018					2017
			Equity in					Equity in					Equity in
(in millions)	Investments		earnings			Investments		earnings			Investments		earnings
Electric Utilities and Infrastructure	$	122	$	9		$	97	$	6		$	89	$	5
Gas Utilities and Infrastructure	1,388		114			1,003		27			763		62
Commercial Renewables	314		(4		)	201		(1		)	190		(5		)
Other	112		43			108		51			133		57
Total	$	1,936	$	162		$	1,409	$	83		$	1,175	$	119

The table below outlines Duke Energy's ownership interests in natural gas pipeline companies and natural gas storage facilities.

			Investment Amount (in millions)
	Ownership		December 31,		December 31,
Entity Name	Interest		2019		2018
Pipeline Investments
ACP	47	%	$	1,179	$	797
Sabal Trail	7.5	%	121		112		(c)
Constitution	24	%	—		25
Cardinal(a)	21.49	%	9		10
Storage Facilities
Pine Needle(a)	45	%	28		13
Hardy Storage(a)	50	%	51		46
Total Investments(b)			$	1,388	$	1,003

(a) Piedmont owns the Cardinal, Pine Needle and Hardy Storage investments.

(b) Duke Energy includes purchase accounting adjustments related to Piedmont.

(c)

Sabal Trail returned capital of $112 million during the year ended December 31, 2018.