Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2018

Defined Benefit Plan Disclosure [Line Items]

Schedule of Defined Benefit Plans Disclosures

Foreign Operations

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

	Three-Month Periods
	Ended March 31,
	2018			2017
Service cost	$	5		$	6
Interest cost	14			14
Expected return on plan assets	(27		)	(24		)
Net amortization	15			17
Net periodic benefit cost	$	7		$	13

Domestic Operations

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

	Three-Month Periods
	Ended March 31,
	2018			2017
Pension:
Service cost	$	5		$	6
Interest cost	26			29
Expected return on plan assets	(41		)	(40		)
Net amortization	8			7
Net periodic benefit cost	$	(2	)	$	2
Other postretirement:
Service cost	$	2		$	2
Interest cost	6			6
Expected return on plan assets	(10		)	(10		)
Net amortization	(3		)	(3		)
Net periodic benefit credit	$	(5	)	$	(5	)

PacifiCorp [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Defined Benefit Plans Disclosures

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

	Three-Month Periods
	Ended March 31,
	2018			2017
Pension:
Service cost	$	—		$	—
Interest cost	11			12
Expected return on plan assets	(18		)	(18		)
Net amortization	3			4
Net periodic benefit credit	$	(4	)	$	(2	)
Other postretirement:
Service cost	$	—		$	1
Interest cost	3			3
Expected return on plan assets	(5		)	(6		)
Net amortization	(1		)	(1		)
Net periodic benefit credit	$	(3	)	$	(3	)

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
	Ended March 31,
	2018			2017
Pension:
Service cost	$	2		$	2
Interest cost	7			8
Expected return on plan assets	(11		)	(11		)
Net amortization	1			—
Net periodic benefit credit	$	(1	)	$	(1	)
Other postretirement:
Service cost	$	1		$	1
Interest cost	2			2
Expected return on plan assets	(3		)	(3		)
Net amortization	(1		)	(1		)
Net periodic benefit credit	$	(1	)	$	(1	)

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
	March 31,			December 31,
	2018			2017
Qualified Pension Plan -
Other long-term liabilities	$	(23	)	$	(23	)
Non-Qualified Pension Plans:
Other current liabilities	(1		)	(1		)
Other long-term liabilities	(10		)	(10		)
Other Postretirement Plans -
Other long-term liabilities	1			1

Sierra Pacific Power Company [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Amounts Recognized in Balance Sheet

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

	As of
	March 31,			December 31,
	2018			2017
Qualified Pension Plan -
Other long-term liabilities	$	(2	)	$	(2	)
Non-Qualified Pension Plans:
Other current liabilities	(1		)	(1		)
Other long-term liabilities	(8		)	(8		)
Other Postretirement Plans -
Other long-term liabilities	(20		)	(20		)