Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2024

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Benefit Costs

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,
	2024		2023
Pension:
Service cost	$	3	$	4
Interest cost	26		28
Expected return on plan assets	(31)		(31)
Settlement	—		(5)
Net amortization	2		4
Net periodic benefit cost	$	—	$	—
Other postretirement:
Service cost	$	1	$	1
Interest cost	7		7
Expected return on plan assets	(8)		(8)
Net amortization	(1)		(1)
Net periodic benefit credit	$	(1)	$	(1)

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

	Three-Month Periods
	Ended March 31,
	2024		2023
Service cost	$	1	$	2
Interest cost	14		14
Expected return on plan assets	(20)		(19)
Net amortization	7		6
Net periodic benefit cost	$	2	$	3

PAC

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Benefit Costs

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

	Three-Month Periods
	Ended March 31,
	2024		2023
Pension:
Interest cost	$	9	$	10
Expected return on plan assets	(12)		(12)
Net amortization	2		3
Net periodic benefit (credit) cost	$	(1)	$	1
Other postretirement:
Service cost	$	—	$	—
Interest cost	3		3
Expected return on plan assets	(3)		(3)
Net amortization	(1)		(1)
Net periodic benefit credit	$	(1)	$	(1)

MEC

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Benefit Costs

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

	Three-Month Periods
	Ended March 31,
	2024		2023
Pension:
Service cost	$	2	$	3
Interest cost	8		8
Expected return on plan assets	(8)		(8)
Settlement	—		(5)
Net periodic benefit cost (credit)	$	2	$	(2)
Other postretirement:
Service cost	$	1	$	1
Interest cost	3		3
Expected return on plan assets	(4)		(4)
Net periodic benefit cost	$	—	$	—

NPC

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,
	2024		2023
Qualified Pension Plan -
Other non-current assets	$	38	$	38
Non-Qualified Pension Plans:
Other current liabilities	(1)		(1)
Other long-term liabilities	(6)		(6)
Other Postretirement Plans -
Other non-current assets	10		10

SPPC

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,
	2024		2023
Qualified Pension Plan -
Other non-current assets	$	54	$	53
Non-Qualified Pension Plans:
Other current liabilities	(1)		(1)
Other long-term liabilities	(5)		(5)
Other Postretirement Plans -
Other non-current assets	—		1