Related Party Transactions (Tables)

6 Months Ended

Jun. 30, 2018

Related Party Transaction [Line Items]

Schedule of Related Party Transactions, Other Revenue and Expense

Material amounts related to transactions with related parties included on the Condensed Consolidated Statements of Operations and Comprehensive Income are presented in the following table.

	Three Months Ended June 30,				Six Months Ended June 30,
(in millions)	2018		2017		2018		2017
Duke Energy Carolinas
Corporate governance and shared service expenses(a)	$	213	$	218	$	433	$	439
Indemnification coverages(b)	5		6		11		12
JDA revenue(c)	19		17		53		33
JDA expense(c)	19		21		73		52
Intercompany natural gas purchases(d)	4		1		8		2
Progress Energy
Corporate governance and shared service expenses(a)	$	206	$	178	$	397	$	348
Indemnification coverages(b)	9		9		17		19
JDA revenue(c)	19		21		73		52
JDA expense(c)	19		17		53		33
Intercompany natural gas purchases(d)	19		19		38		38
Duke Energy Progress
Corporate governance and shared service expenses(a)	$	126	$	109	$	244	$	209
Indemnification coverages(b)	3		3		6		7
JDA revenue(c)	19		21		73		52
JDA expense(c)	19		17		53		33
Intercompany natural gas purchases(d)	19		19		38		38
Duke Energy Florida
Corporate governance and shared service expenses(a)	$	80	$	69	$	153	$	139
Indemnification coverages(b)	6		6		11		12
Duke Energy Ohio
Corporate governance and shared service expenses(a)	$	90	$	93	$	179	$	185
Indemnification coverages(b)	1		1		2		2
Duke Energy Indiana
Corporate governance and shared service expenses(a)	$	96	$	92	$	197	$	187
Indemnification coverages(b)	2		2		4		4
Piedmont
Corporate governance and shared service expenses(a)	$	40	$	9	$	76	$	14
Indemnification coverages(b)	—		—		1		1
Intercompany natural gas sales(d)	23		20		46		40

(a) The Subsidiary Registrants are charged their proportionate share of corporate governance and other shared services costs, primarily related to human resources, employee benefits, information technology, legal and accounting fees, as well as other third-party costs. These amounts are primarily recorded in Operation, maintenance and other on the Condensed Consolidated Statements of Operations and Comprehensive Income.

(b) The Subsidiary Registrants incur expenses related to certain indemnification coverages through Bison, Duke Energy’s wholly owned captive insurance subsidiary. These expenses are recorded in Operation, maintenance and other on the Condensed Consolidated Statements of Operations and Comprehensive Income.

(c) Duke Energy Carolinas and Duke Energy Progress participate in a Joint Dispatch Agreement (JDA), which allows the collective dispatch of power plants between the service territories to reduce customer rates. Revenues from the sale of power and expenses from the purchase of power pursuant to the JDA are recorded in Operating Revenues and Fuel used in electric generation and purchased power, respectively, on the Condensed Consolidated Statements of Operations and Comprehensive Income.

(d) Piedmont provides long–term natural gas delivery service to certain Duke Energy Carolinas and Duke Energy Progress natural gas–fired generation facilities. Piedmont records the sales in Operating revenues, and Duke Energy Carolinas and Duke Energy Progress record the related purchases as a component of Fuel used in electric generation and purchased power on their respective Condensed Consolidated Statements of Operations and Comprehensive Income. These intercompany revenues and expenses are eliminated in consolidation.

The following table presents expenses for the three and six months ended June 30, 2018, and 2017, which are included in Cost of natural gas on Piedmont's Condensed Consolidated Statements of Operations and Comprehensive Income.

		Three Months Ended June 30,				Six Months Ended June 30,
(in millions)	Type of expense	2018		2017		2018		2017
Cardinal	Transportation Costs	$	1	$	2	$	3	$	4
Pine Needle	Natural Gas Storage Costs	2		2		4		4
Hardy Storage	Natural Gas Storage Costs	3		3		5		5
Total		$	6	$	7	$	12	$	13

The following table includes the balance of intercompany income tax receivables and payables for the Subsidiary Registrants.

	Duke				Duke		Duke		Duke		Duke
	Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
June 30, 2018
Intercompany income tax receivable	$	—	$	273	$	—	$	140	$	—	$	—	$	12
Intercompany income tax payable	22		—		24		—		3		14		—
December 31, 2017
Intercompany income tax receivable	$	—	$	168	$	—	$	44	$	22	$	—	$	7
Intercompany income tax payable	44		—		21		—		—		35		—