Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2018

Defined Benefit Plan Disclosure [Line Items]

Schedule of Defined Benefit Plans Disclosures

Domestic Operations

Net periodic benefit (credit) cost for the domestic pension and other postretirement benefit plans included the following components (in millions):

	Three-Month Periods						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2018			2017			2018			2017
Pension:
Service cost	$	5		$	6		$	15		$	18
Interest cost	26			29			78			87
Expected return on plan assets	(41		)	(40		)	(123		)	(120		)
Net amortization	8			7			23			22
Net periodic benefit (credit) cost	$	(2	)	$	2		$	(7	)	$	7
Other postretirement:
Service cost	$	1		$	3		$	6		$	7
Interest cost	7			7			19			21
Expected return on plan assets	(9		)	(9		)	(31		)	(30		)
Net amortization	(3		)	(3		)	(9		)	(10		)
Net periodic benefit credit	$	(4	)	$	(2	)	$	(15	)	$	(12	)

Foreign Operations

Net periodic benefit cost for the United Kingdom pension plan included the following components (in millions):

	Three-Month Periods						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2018			2017			2018			2017
Service cost	$	5		$	6		$	15		$	19
Interest cost	14			15			42			44
Expected return on plan assets	(25		)	(25		)	(78		)	(74		)
Settlement	12			18			36			18
Net amortization	9			17			38			50
Net periodic benefit cost	$	15		$	31		$	53		$	57

PacifiCorp [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Defined Benefit Plans Disclosures

Net periodic benefit credit for the pension and other postretirement benefit plans included the following components (in millions):

	Three-Month Periods				Nine-Month Periods
	Ended September 30,				Ended September 30,
	2018		2017		2018		2017
Pension:
Service cost	—		—		—		—
Interest cost	11		12		32		37
Expected return on plan assets	(18	)	(18	)	(54	)	(54	)
Net amortization	3		3		10		10
Net periodic benefit credit	(4	)	(3	)	(12	)	(7	)
Other postretirement:
Service cost	—		1		1		2
Interest cost	3		3		9		10
Expected return on plan assets	(5	)	(5	)	(16	)	(16	)
Net amortization	(1	)	(1	)	(4	)	(4	)
Net periodic benefit credit	(3	)	(2	)	(10	)	(8	)

MidAmerican Energy Company [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Defined Benefit Plans Disclosures

Net periodic benefit (credit) cost for the plans of MidAmerican Energy and the aforementioned affiliates included the following components (in millions):

	Three-Month Periods						Nine-Month Periods
	Ended September 30,						Ended September 30,
	2018			2017			2018			2017
Pension:
Service cost	$	2		$	2		$	6		$	7
Interest cost	7			8			21			23
Expected return on plan assets	(11		)	(11		)	(33		)	(33		)
Net amortization	1			—			2			1
Net periodic benefit credit	$	(1	)	$	(1	)	$	(4	)	$	(2	)
Other postretirement:
Service cost	$	1		$	2		$	4		$	4
Interest cost	2			3			6			7
Expected return on plan assets	(3		)	(3		)	(10		)	(10		)
Net amortization	(1		)	(1		)	(3		)	(3		)
Net periodic benefit credit	$	(1	)	$	1		$	(3	)	$	(2	)

Nevada Power Company [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Amounts Recognized in Balance Sheet

Amounts receivable from (payable to) NV Energy are included on the Consolidated Balance Sheets and consist of the following (in millions):

	As of
	September 30,			December 31,
	2018			2017
Qualified Pension Plan:
Other long-term liabilities	$	(4	)	$	(23	)
Non-Qualified Pension Plans:
Other current liabilities	(1		)	(1		)
Other long-term liabilities	(10		)	(10		)
Other Postretirement Plans:
Other assets	1			—
Other long-term liabilities	—			1

Sierra Pacific Power Company [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Amounts Recognized in Balance Sheet

Amounts receivable from (payable to) NV Energy are included on the Consolidated Balance Sheets and consist of the following (in millions):

	As of
	September 30,			December 31,
	2018			2017
Qualified Pension Plan:
Other assets	$	6		$	—
Other long-term liabilities	—			(2		)
Non-Qualified Pension Plans:
Other current liabilities	(1		)	(1		)
Other long-term liabilities	(8		)	(8		)
Other Postretirement Plans:
Other long-term liabilities	(13		)	(20		)