Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2020

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Benefit Costs [Table Text Block]

Net periodic benefit cost for the plans included the following components for the years ended December 31 (in millions):

	Pension						Other Postretirement
	2020		2019		2018		2020		2019		2018
Service cost	$	17	$	16	$	21	$	7	$	8	$	9
Interest cost	93		111		105		21		27		24
Expected return on plan assets	(140)		(154)		(164)		(34)		(40)		(41)
Settlement	—		—		21		—		—		—
Net amortization	32		31		28		(4)		(6)		(13)
Net periodic benefit cost (credit)	$	2	$	4	$	11	$	(10)	$	(11)	$	(21)

Net periodic benefit cost for the UK Plan included the following components for the years ended December 31 (in millions):

	2020		2019		2018
Service cost	$	16	$	16	$	19
Interest cost	40		49		56
Expected return on plan assets	(101)		(100)		(101)
Settlement	17		26		44
Net amortization	43		46		45
Net periodic benefit cost	$	15	$	37	$	63

Changes in Fair Value of Plan Assets [Table Text Block]

The following table is a reconciliation of the fair value of plan assets for the years ended December 31 (in millions):

	Pension				Other Postretirement
	2020		2019		2020		2019
Plan assets at fair value, beginning of year	$	2,656	$	2,396	$	742	$	664
Employer contributions	13		12		3		2
Participant contributions	—		—		8		9
Actual return on plan assets	373		456		40		122
Settlement	—		(22)		—		—
Benefits paid	(218)		(186)		(49)		(55)
Plan assets at fair value, end of year	$	2,824	$	2,656	$	744	$	742

The following table is a reconciliation of the fair value of plan assets for the years ended December 31 (in millions):

	2020		2019
Plan assets at fair value, beginning of year	$	2,151	$	1,989
Employer contributions	56		56
Participant contributions	1		1
Actual return on plan assets	181		194
Settlement	(63)		(99)
Benefits paid	(67)		(71)
Foreign currency exchange rate changes	75		81
Plan assets at fair value, end of year	$	2,334	$	2,151

Changes in Projected Benefit Obligations [Table Text Block]

The following table is a reconciliation of the benefit obligations for the years ended December 31 (in millions):

	Pension				Other Postretirement
	2020		2019		2020		2019
Benefit obligation, beginning of year	$	2,878	$	2,718	$	673	$	672
Service cost	17		16		7		8
Interest cost	93		111		21		27
Participant contributions	—		—		8		9
Actuarial loss	226		242		61		12
Amendment	—		(1)		—		—
Settlement	—		(22)		—		—
Acquisition	81		—		37		—
Benefits paid	(218)		(186)		(49)		(55)
Benefit obligation, end of year	$	3,077	$	2,878	$	758	$	673
Accumulated benefit obligation, end of year	$	2,999	$	2,867

The following table is a reconciliation of the benefit obligation for the years ended December 31 (in millions):

	2020		2019
Benefit obligation, beginning of year	$	2,019	$	1,833
Service cost	16		16
Interest cost	40		49
Participant contributions	1		1
Actuarial loss	188		175
Settlement	(63)		(99)
Benefits paid	(67)		(71)
Foreign currency exchange rate changes	71		115
Benefit obligation, end of year	$	2,205	$	2,019
Accumulated benefit obligation, end of year	$	1,963	$	1,786

Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]

The funded status of the plans and the amounts recognized on the Consolidated Balance Sheets as of December 31 are as follows (in millions):

	Pension				Other Postretirement
	2020		2019		2020		2019
Plan assets at fair value, end of year	$	2,824	$	2,656	$	744	$	742
Benefit obligation, end of year	3,077		2,878		758		673
Funded status	$	(253)	$	(222)	$	(14)	$	69
Amounts recognized on the Consolidated Balance Sheets:
Other assets	$	43	$	73	$	20	$	76
Other current liabilities	(13)		(13)		—		—
Other long-term liabilities	(283)		(282)		(34)		(7)
Amounts recognized	$	(253)	$	(222)	$	(14)	$	69

The fair value of plan assets, projected benefit obligation and accumulated benefit obligation for (1) pension and other postretirement benefit plans with a projected benefit obligation in excess of the fair value of plan assets and (2) pension plans with an accumulated benefit obligation in excess of the fair value of plan assets as of December 31 are as follows (in millions):

	Pension				Other Postretirement
	2020		2019		2020		2019
Fair value of plan assets	$	1,782	$	1,939	$	417	$	439
Projected benefit obligation	$	2,069	$	2,227	$	451	$	446
Fair value of plan assets	$	1,064	$	1,939
Accumulated benefit obligation	$	1,341	$	2,222

The funded status of the UK Plan and the amounts recognized on the Consolidated Balance Sheets as of December 31 are as follows (in millions):

	2020		2019
Plan assets at fair value, end of year	$	2,334	$	2,151
Benefit obligation, end of year	2,205		2,019
Funded status	$	129	$	132
Amounts recognized on the Consolidated Balance Sheets:
Other assets	$	129	$	132

Net Periodic Benefit Costs Not Yet Recognized [Table Text Block]

The portion of the funded status of the plans not yet recognized in net periodic benefit cost as of December 31 is as follows (in millions):

	Pension				Other Postretirement
	2020		2019		2020		2019
Net loss (gain)	$	612	$	653	$	34	$	(23)
Prior service credit	(1)		(2)		(9)		(14)
Regulatory deferrals	2		1		3		6
Total	$	613	$	652	$	28	$	(31)

A reconciliation of the amounts not yet recognized as components of net periodic benefit cost for the years ended December 31, 2020 and 2019 is as follows (in millions):

					Accumulated
					Other
	Regulatory		Regulatory		Comprehensive
	Asset		Liability		Loss		Total
Pension
Balance, December 31, 2018	$	730	$	—	$	16	$	746
Net (gain) loss arising during the year	(38)		(33)		10		(61)
Net prior service credit arising during the year	—		—		(2)		(2)
Net amortization	(31)		—		—		(31)
Total	(69)		(33)		8		(94)
Balance, December 31, 2019	661		(33)		24		652
Net (gain) loss arising during the year	(30)		13		10		(7)
Net amortization	(31)		—		(1)		(32)
Total	(61)		13		9		(39)
Balance, December 31, 2020	$	600	$	(20)	$	33	$	613

					Accumulated
					Other
	Regulatory		Regulatory		Comprehensive
	Asset		Liability		Loss		Total
Other Postretirement
Balance, December 31, 2018	$	44	$	(10)	$	1	$	35
Net gain arising during the year	(45)		(23)		(4)		(72)
Net amortization	5		1		—		6
Total	(40)		(22)		(4)		(66)
Balance, December 31, 2019	4		(32)		(3)		(31)
Net loss arising during the year	36		12		7		55
Net amortization	7		(3)		—		4
Total	43		9		7		59
Balance, December 31, 2020	$	47	$	(23)	$	4	$	28

The portion of the funded status of the UK Plan not yet recognized in net periodic benefit cost as of December 31 is as follows (in millions):

	2020		2019
Net loss	$	612	$	543
Prior service cost	6		6
Total	$	618	$	549

A reconciliation of the amounts not yet recognized as components of net periodic benefit cost, which are included in accumulated other comprehensive loss on the Consolidated Balance Sheets, for the years ended December 31 is as follows (in millions):

	2020		2019
Balance, beginning of year	$	549	$	480
Net loss arising during the year	108		81
Settlement	(17)		(26)
Net amortization	(43)		(46)
Foreign currency exchange rate changes	21		60
Total	69		69
Balance, end of year	$	618	$	549

Plan Assumptions [Table Text Block]

Weighted-average assumptions used to determine benefit obligations and net periodic benefit cost were as follows:

	Pension						Other Postretirement
	2020		2019		2018		2020		2019		2018
Benefit obligations as of December 31:
Discount rate	2.60	%	3.32	%	4.25	%	2.59	%	3.24	%	4.21	%
Rate of compensation increase	2.75	%	2.75	%	2.75	%	NA		NA		NA
Interest crediting rates for cash balance plan
2018	NA		NA		3.38	%	NA		NA		NA
2019	NA		3.22	%	3.54	%	NA		NA		NA
2020	2.44	%	2.94	%	3.54	%	NA		NA		NA
2021	2.25	%	2.94	%	3.56	%	NA		NA		NA
2022	2.25	%	3.02	%	3.56	%	NA		NA		NA
2023	2.65	%	3.02	%	3.56	%	NA		NA		NA
Net periodic benefit cost for the years ended December 31:
Discount rate	3.32	%	4.25	%	3.60	%	3.24	%	4.21	%	3.57	%
Expected return on plan assets	5.94	%	6.48	%	6.36	%	5.42	%	6.39	%	6.44	%
Rate of compensation increase	2.75	%	2.75	%	2.75	%	NA		NA		NA
Interest crediting rate for cash balance plan	2.44	%	3.22	%	3.38	%	NA		NA		NA

In establishing its assumption as to the expected return on plan assets, the Company utilizes the asset allocation and return assumptions for each asset class based on historical performance and forward-looking views of the financial markets.

	2020		2019
Assumed healthcare cost trend rates as of December 31:
Healthcare cost trend rate assumed for next year	6.30	%	6.50	%
Rate that the cost trend rate gradually declines to	5.00	%	5.00	%
Year that the rate reaches the rate it is assumed to remain at	2025		2025

Assumptions used to determine benefit obligations and net periodic benefit cost were as follows:

	2020		2019		2018
Benefit obligations as of December 31:
Discount rate	1.40	%	2.10	%	2.90	%
Rate of compensation increase	3.05	%	3.30	%	3.55	%
Rate of future price inflation	2.55	%	2.80	%	3.05	%
Net periodic benefit cost for the years ended December 31:
Discount rate	2.10	%	2.90	%	2.60	%
Expected return on plan assets	5.00	%	5.10	%	4.90	%
Rate of compensation increase	3.30	%	3.55	%	3.45	%
Rate of future price inflation	2.80	%	3.05	%	2.95	%

Expected Benefit Payments [Table Text Block]

The expected benefit payments to participants in the Company's pension and other postretirement benefit plans for 2021 through 2025 and for the five years thereafter are summarized below (in millions):

	Projected Benefit
	Payments
			Other
	Pension		Postretirement
2021	$	236	$	53
2022	219		54
2023	220		54
2024	211		54
2025	206		52
2026-2030	926		238

Employer contributions to the UK Plan are expected to be £50 million during 2021. The expected benefit payments to participants in the UK Plan for 2021 through 2025 and for the five years thereafter, excluding lump sum settlement elections and using the foreign currency exchange rate as of December 31, 2020, are summarized below (in millions):

2021	$	74
2022	75
2023	77
2024	79
2025	81
2026-2030	431

Allocation of Plan Assets [Table Text Block]

The target allocations (percentage of plan assets) for the Company's pension and other postretirement benefit plan assets are as follows as of December 31, 2020:

		Other
	Pension	Postretirement
	%	%
PacifiCorp:
Debt securities(1)	25-35	75-83
Equity securities(1)	53-68	16-24
Limited partnership interests	7-12	1-3
MidAmerican Energy:
Debt securities(1)	50-80	60-70
Equity securities(1)	20-50	30-40
Real estate funds	0-5	—
Other	0-5	0-5
NV Energy:
Debt securities(1)	60-75	60-70
Equity securities(1)	25-40	30-40

(1)For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds are allocated based on the underlying investments in debt and equity securities.

The target allocations (percentage of plan assets) for the UK Plan assets are as follows as of December 31, 2020:

	%
Debt securities(1)	60-70
Equity securities(1)	10-20
Real estate funds and other	15-25

(1)For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds have been allocated based on the underlying investments in debt and equity securities.

Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The following table presents the fair value of plan assets, by major category, for the Company's defined benefit pension plans (in millions):

	Input Levels for Fair Value Measurements(1)
	Level 1		Level 2		Total
As of December 31, 2020:
Cash equivalents	$	—	$	79	$	79
Debt securities:
United States government obligations	52		—		52
Corporate obligations	—		748		748
Municipal obligations	—		69		69
Equity securities:
United States companies	224		—		224
Total assets in the fair value hierarchy	$	276	$	896	1,172
Investment funds(2) measured at net asset value					1,521
Limited partnership interests(3) measured at net asset value					88
Real estate funds measured at net asset value					43
Total assets measured at fair value					$	2,824
As of December 31, 2019:
Cash equivalents	$	27	$	36	$	63
Debt securities:
United States government obligations	210		—		210
International government obligations	—		5		5
Corporate obligations	—		376		376
Municipal obligations	—		28		28
Agency, asset and mortgage-backed obligations	—		115		115
Equity securities:
United States companies	547		1		548
International companies	136		—		136
Investment funds(2)	125		—		125
Total assets in the fair value hierarchy	$	1,045	$	561	1,606
Investment funds(2) measured at net asset value					915
Limited partnership interests(3) measured at net asset value					93
Real estate funds measured at net asset value					42
Total assets measured at fair value					$	2,656

(1)Refer to Note 15 for additional discussion regarding the three levels of the fair value hierarchy.

(2)Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 69% and 31%, respectively, for 2020 and 62% and 38%, respectively, for 2019. Additionally, these funds are invested in United States and international securities of approximately 79% and 21%, respectively, for 2020 and 66% and 34%, respectively, for 2019.

(3)Limited partnership interests include several funds that invest primarily in real estate, buyout, growth equity and venture capital.

The following table presents the fair value of plan assets, by major category, for the Company's defined benefit other postretirement plans (in millions):

	Input Levels for Fair Value Measurements(1)
	Level 1		Level 2		Total
As of December 31, 2020:
Cash equivalents	$	20	$	2	$	22
Debt securities:
United States government obligations	15		—		15
Corporate obligations	—		102		102
Municipal obligations	—		82		82
Agency, asset and mortgage-backed obligations	—		47		47
Equity securities:
United States companies	6		—		6
Investment funds(2)	299		—		299
Total assets in the fair value hierarchy	$	340	$	233	573
Investment funds(2) measured at net asset value					167
Limited partnership interests(3) measured at net asset value					4
Total assets measured at fair value					$	744
As of December 31, 2019:
Cash equivalents	$	17	$	1	$	18
Debt securities:
United States government obligations	23		—		23
Corporate obligations	—		44		44
Municipal obligations	—		57		57
Agency, asset and mortgage-backed obligations	—		33		33
Equity securities:
United States companies	151		—		151
International companies	6		—		6
Investment funds(2)	236		—		236
Total assets in the fair value hierarchy	$	433	$	135	568
Investment funds(2) measured at net asset value					169
Limited partnership interests(3) measured at net asset value					5
Total assets measured at fair value					$	742

(1)Refer to Note 15 for additional discussion regarding the three levels of the fair value hierarchy.

(2)Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 40% and 60%, respectively, for 2020 and 58% and 42%, respectively, for 2019. Additionally, these funds are invested in United States and international securities of approximately 79% and 21%, respectively, for 2020 and 75% and 25%, respectively, for 2019.

(3)Limited partnership interests include several funds that invest primarily in real estate, buyout, growth equity and venture capital.

The following table presents the fair value of the UK Plan assets, by major category (in millions):

	Input Levels for Fair Value Measurements(1)
	Level 1		Level 2		Level 3		Total
As of December 31, 2020:
Cash equivalents	$	5	$	49	$	—	$	54
Debt securities:
United Kingdom government obligations	1,102		—		—		1,102
Equity securities:
Investment funds(2)	—		833		—		833
Real estate funds	—		—		237		237
Total	$	1,107	$	882	$	237	2,226
Investment funds(2) measured at net asset value							108
Total assets measured at fair value							$	2,334
As of December 31, 2019:
Cash equivalents	$	3	$	24	$	—	$	27
Debt securities:
United Kingdom government obligations	960		—		—		960
Equity securities:
Investment funds(2)	—		818		—		818
Real estate funds	—		—		243		243
Total	$	963	$	842	$	243	2,048
Investment funds(2) measured at net asset value							103
Total assets measured at fair value							$	2,151

(1)Refer to Note 15 for additional discussion regarding the three levels of the fair value hierarchy.

(2)Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 40% and 60%, respectively, for 2020 and 38% and 62%, respectively, for 2019.

The following table presents the Company's assets and liabilities recognized on the Consolidated Balance Sheets and measured at fair value on a recurring basis (in millions):

	Input Levels for Fair Value Measurements
	Level 1		Level 2		Level 3		Other(1)		Total
As of December 31, 2020:
Assets:
Commodity derivatives	$	1	$	73	$	135	$	(21)	$	188
Foreign currency exchange rate derivatives	—		20		—		—		20
Interest rate derivatives	—		—		62		—		62
Mortgage loans held for sale	—		2,001		—		—		2,001
Money market mutual funds(2)	873		—		—		—		873
Debt securities:
United States government obligations	200		—		—		—		200
International government obligations	—		5		—		—		5
Corporate obligations	—		73		—		—		73
Municipal obligations	—		2		—		—		2
Agency, asset and mortgage-backed obligations	—		6		—		—		6
Equity securities:
United States companies	381		—		—		—		381
International companies	5,906		—		—		—		5,906
Investment funds	201		—		—		—		201
	$	7,562	$	2,180	$	197	$	(21)	$	9,918
Liabilities:
Commodity derivatives	$	(1)	$	(90)	$	(19)	$	56	$	(54)
Foreign currency exchange rate derivatives	—		(2)		—		—		(2)
Interest rate derivatives	(5)		(60)		—		—		(65)
	$	(6)	$	(152)	$	(19)	$	56	$	(121)

As of December 31, 2019:
Assets:
Commodity derivatives	$	—	$	45	$	108	$	(24)	$	129
Interest rate derivatives	—		2		14		—		16
Mortgage loans held for sale	—		1,039		—		—		1,039
Money market mutual funds(2)	824		—		—		—		824
Debt securities:
United States government obligations	189		—		—		—		189
International government obligations	—		4		—		—		4
Corporate obligations	—		58		—		—		58
Municipal obligations	—		1		—		—		1
Agency, asset and mortgage-backed obligations	—		1		—		—		1
Equity securities:
United States companies	336		—		—		—		336
International companies	1,131		—		—		—		1,131
Investment funds	169		—		—		—		169
	$	2,649	$	1,150	$	122	$	(24)	$	3,897
Liabilities:
Commodity derivatives	$	(4)	$	(143)	$	(11)	$	103	$	(55)
Interest rate derivatives	(2)		(19)		—		—		(21)
	$	(6)	$	(162)	$	(11)	$	103	$	(76)

(1)Represents netting under master netting arrangements and a net cash collateral receivable of $35 million and $79 million as of December 31, 2020 and 2019, respectively.

(2)Amounts are included in cash and cash equivalents; other current assets; and noncurrent investments and restricted cash and investments on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.

Level Three Defined Benefit Plan Assets Roll Forward [Table Text Block]

The following table reconciles the beginning and ending balances of the UK Plan assets measured at fair value using significant Level 3 inputs for the years ended December 31 (in millions):

	Real Estate Funds
	2020		2019		2018
Beginning balance	$	243	$	239	$	230
Actual return on plan assets still held at period end	(13)		(5)		23
Foreign currency exchange rate changes	7		9		(14)
Ending balance	$	237	$	243	$	239

PacifiCorp [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Benefit Costs [Table Text Block]

Net periodic benefit cost for the plans included the following components for the years ended December 31 (in millions):

	Pension						Other Postretirement
	2020		2019		2018		2020		2019		2018
Service cost	$	—	$	—	$	—	$	2	$	2	$	2
Interest cost	36		44		43		9		12		11
Expected return on plan assets	(56)		(67)		(72)		(14)		(21)		(21)
Settlement	—		—		22		—		—		—
Net amortization	18		11		13		3		—		(6)
Net periodic benefit (credit) cost	$	(2)	$	(12)	$	6	$	—	$	(7)	$	(14)

Changes in Fair Value of Plan Assets [Table Text Block]

The following table is a reconciliation of the fair value of plan assets for the years ended December 31 (in millions):

	Pension				Other Postretirement
	2020		2019		2020		2019
Plan assets at fair value, beginning of year	$	1,036	$	942	$	334	$	297
Employer contributions(1)	5		4		—		1
Participant contributions	—		—		4		5
Actual return on plan assets	124		181		15		55
Benefits paid	(101)		(91)		(26)		(24)
Plan assets at fair value, end of year	$	1,064	$	1,036	$	327	$	334

Changes in Projected Benefit Obligations [Table Text Block]

The following table is a reconciliation of the benefit obligations for the years ended December 31 (in millions):

	Pension				Other Postretirement
	2020		2019		2020		2019
Benefit obligation, beginning of year	$	1,167	$	1,105	$	304	$	298
Service cost	—		—		2		2
Interest cost	36		44		9		12
Participant contributions	—		—		4		5
Actuarial loss	100		109		14		11
Benefits paid	(101)		(91)		(26)		(24)
Benefit obligation, end of year	$	1,202	$	1,167	$	307	$	304
Accumulated benefit obligation, end of year	$	1,202	$	1,167

Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]

The funded status of the plans and the amounts recognized on the Consolidated Balance Sheets as of December 31 are as follows (in millions):

	Pension				Other Postretirement
	2020		2019		2020		2019
Plan assets at fair value, end of year	$	1,064	$	1,036	$	327	$	334
Less - Benefit obligation, end of year	1,202		1,167		307		304
Funded status	$	(138)	$	(131)	$	20	$	30
Amounts recognized on the Consolidated Balance Sheets:
Other assets	$	8	$	7	$	20	$	30
Accrued employee expenses	(4)		(4)		—		—
Other long-term liabilities	(142)		(134)		—		—
Amounts recognized	$	(138)	$	(131)	$	20	$	30

Net Periodic Benefit Costs Not Yet Recognized [Table Text Block]

The portion of the funded status of the plans not yet recognized in net periodic benefit cost as of December 31 is as follows (in millions):

	Pension				Other Postretirement
	2020		2019		2020		2019
Net loss (gain)	$	455	$	442	$	(13)	$	(26)
Regulatory deferrals	2		1		3		6
Total	$	457	$	443	$	(10)	$	(20)

A reconciliation of the amounts not yet recognized as components of net periodic benefit cost for the years ended December 31, 2020 and 2019 is as follows (in millions):

			Accumulated
			Other
	Regulatory		Comprehensive
	Asset		Loss		Total
Pension
Balance, December 31, 2018	$	443	$	17	$	460
Net (gain) loss arising during the year	(11)		5		(6)
Net amortization	(10)		(1)		(11)
Total	(21)		4		(17)
Balance, December 31, 2019	422		21		443
Net loss arising during the year	27		5		32
Net amortization	(17)		(1)		(18)
Total	10		4		14
Balance, December 31, 2020	$	432	$	25	$	457

	Regulatory
	Asset (Liability)
Other Postretirement
Balance, December 31, 2018	$	5
Net gain arising during the year	(25)
Net amortization	—
Total	(25)
Balance, December 31, 2019	(20)
Net loss arising during the year	13
Net amortization	(3)
Total	10
Balance, December 31, 2020	$	(10)

Expected Benefit Payments [Table Text Block]

The expected benefit payments to participants in PacifiCorp's pension and other postretirement benefit plans for 2021 through 2025 and for the five years thereafter are summarized below (in millions):

	Projected Benefit Payments
	Pension		Other Postretirement
2021	$	115	$	24
2022	99		23
2023	94		22
2024	87		22
2025	82		20
2026-2030	341		90

Allocation of Plan Assets [Table Text Block]

The target allocations (percentage of plan assets) for PacifiCorp's pension and other postretirement benefit plan assets are as follows as of December 31, 2020:

	Pension(1)	Other Postretirement(1)
	%	%
Debt securities(2)	25 - 35	75 - 83
Equity securities(2)	53 - 68	16 - 24
Limited partnership interests	7 - 12	1 - 3

(1)The trust in which the PacifiCorp Retirement Plan is invested includes a separate account that is used to fund benefits for the other postretirement benefit plan. In addition to this separate account, the assets for the other postretirement benefit plan are held in Voluntary Employees' Beneficiary Association ("VEBA") trusts, each of which has its own investment allocation strategies. Target allocations for the other postretirement benefit plan include the separate account of the Retirement Plan trust and the VEBA trusts.

(2)For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds are allocated based on the underlying investments in debt and equity securities.

Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The following table presents the fair value of plan assets, by major category, for PacifiCorp's defined benefit pension plan (in millions):

	Input Levels for Fair Value Measurements
	Level 1(1)		Level 2(1)		Level 3(1)		Total
As of December 31, 2020:
Cash equivalents	$	—	$	32	$	—	$	32
Debt securities:
United States government obligations	14		—		—		14
Corporate obligations	—		231		—		231
Municipal obligations	—		21		—		21
Equity securities:
United States companies	91		—		—		91
Total assets in the fair value hierarchy	$	105	$	284	$	—	389
Investment funds(2) measured at net asset value							587
Limited partnership interests(3) measured at net asset value							88
Investments at fair value							$	1,064
As of December 31, 2019:
Cash equivalents	$	—	$	24	$	—	$	24
Debt securities:
United States government obligations	21		—		—		21
Corporate obligations	—		94		—		94
Municipal obligations	—		10		—		10
Agency, asset and mortgage-backed obligations	—		42		—		42
Equity securities:
United States companies	355		—		—		355
International companies	15		—		—		15
Investment funds(2)	55		—		—		55
Total assets in the fair value hierarchy	$	446	$	170	$	—	616
Investment funds(2) measured at net asset value							327
Limited partnership interests(3) measured at net asset value							93
Investments at fair value							$	1,036

(1)Refer to Note 13 for additional discussion regarding the three levels of the fair value hierarchy.

(2)Investment funds are substantially comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 78% and 22%, respectively, for 2020 and 55% and 45%, respectively, for 2019, and are invested in United States and international securities of approximately 74% and 26%, respectively, for 2020 and 51% and 49%, respectively, for 2019.

(3)Limited partnership interests include several funds that invest primarily in real estate.

The following table presents the fair value of plan assets, by major category, for PacifiCorp's defined benefit other postretirement plan (in millions):

	Input Levels for Fair Value Measurements
	Level 1(1)		Level 2(1)		Level 3(1)		Total
As of December 31, 2020:
Cash and cash equivalents	$	8	$	1	$	—	$	9
Debt securities:
United States government obligations	11		—		—		11
Corporate obligations	—		86		—		86
Municipal obligations	—		16		—		16
Agency, asset and mortgage-backed obligations	—		44		—		44
Equity securities:
United States companies	4		—		—		4
Total assets in the fair value hierarchy	23		147		—		170
Investment funds(2) measured at net asset value							153
Limited partnership interests(3) measured at net asset value							4
Investments at fair value							$	327
As of December 31, 2019:
Cash and cash equivalents	$	8	$	1	$	—	$	9
Debt securities:
United States government obligations	12		—		—		12
Corporate obligations	—		26		—		26
Municipal obligations	—		2		—		2
Agency, asset and mortgage-backed obligations	—		22		—		22
Equity securities:
United States companies	74		—		—		74
International companies	4		—		—		4
Investment funds(2)	44		—		—		44
Total assets in the fair value hierarchy	142		51		—		193
Investment funds(2) measured at net asset value							136
Limited partnership interests(3) measured at net asset value							5
Investments at fair value							$	334

(1)Refer to Note 13 for additional discussion regarding the three levels of the fair value hierarchy.

(2)Investment funds are substantially comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 38% and 62%, respectively, for 2020 and 56% and 44%, respectively, for 2019, and are invested in United States and international securities of approximately 93% and 7%, respectively, for 2020 and 79% and 21%, respectively, for 2019.

(3)Limited partnership interests include several funds that invest primarily in real estate, buyout, growth equity and venture capital.

The following table presents PacifiCorp's assets and liabilities recognized on the Consolidated Balance Sheets and measured at fair value on a recurring basis (in millions):

	Input Levels for Fair Value Measurements
	Level 1		Level 2		Level 3		Other(1)		Total
As of December 31, 2020:
Assets:
Commodity derivatives	$	—	$	36	$	—	$	(3)	$	33
Money market mutual funds(2)	6		—		—		—		6
Investment funds	25		—		—		—		25
	$	31	$	36	$	—	$	(3)	$	64
Liabilities - Commodity derivatives	$	—	$	(53)	$	—	$	27	$	(26)
As of December 31, 2019:
Assets:
Commodity derivatives	$	—	$	21	$	—	$	(7)	$	14
Money market mutual funds (2)	23		—		—		—		23
Investment funds	25		—		—		—		25
	$	48	$	21	$	—	$	(7)	$	62
Liabilities - Commodity derivatives	$	—	$	(84)	$	—	$	54	$	(30)

(1)Represents netting under master netting arrangements and a net cash collateral receivable of $24 million and $47 million as of December 31, 2020 and 2019, respectively.

(2)Amounts are included in cash and cash equivalents, other current assets and other assets on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.

Schedule of Multiemployer Plans [Table Text Block]

The following table presents PacifiCorp's participation in individually significant joint trustee and multiemployer pension plans for the years ended December 31 (dollars in millions):

		PPA zone status or
		plan funded status percentage for
		plan years beginning July 1,					Contributions(1)
Plan name	Employer Identification Number	2020	2019	2018	Funding improvement plan	Surcharge imposed under PPA(1)	2020		2019		2018		Year contributions to plan exceeded more than 5% of total contributions(2)
Local 57 Trust Fund	87-0640888	At least 80%	At least 80%	At least 80%	None	None	$	6	$	7	$	7	2018, 2017, 2016

(1)    PacifiCorp's minimum contributions to the plan are based on the amount of wages paid to employees covered by the Local 57 Trust Fund collective bargaining agreements, subject to ERISA minimum funding requirements.

(2)    For the Local 57 Trust Fund, information is for plan years beginning July 1, 2018, 2017 and 2016. Information for the plan year beginning July 1, 2019 is not yet available.

MidAmerican Energy Company [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Benefit Costs [Table Text Block]

Net periodic benefit cost for the plans of MidAmerican Energy and the aforementioned affiliates included the following components for the years ended December 31 (in millions):

	Pension						Other Postretirement
	2020		2019		2018		2020		2019		2018
Service cost	$	8	$	6	$	9	$	4	$	5	$	5
Interest cost	25		30		28		7		10		8
Expected return on plan assets	(40)		(41)		(44)		(14)		(13)		(13)
Settlement	—		—		(1)		—		—		—
Net amortization	1		1		2		(5)		(3)		(4)
Net periodic benefit (credit) cost	$	(6)	$	(4)	$	(6)	$	(8)	$	(1)	$	(4)

Changes in Fair Value of Plan Assets [Table Text Block]

The following table is a reconciliation of the fair value of plan assets for the years ended December 31 (in millions):

	Pension				Other Postretirement
	2020		2019		2020		2019
Plan assets at fair value, beginning of year	$	717	$	644	$	272	$	247
Employer contributions	6		7		3		1
Participant contributions	—		—		1		2
Actual return on plan assets	55		123		15		42
Benefits paid	(60)		(57)		(13)		(20)
Plan assets at fair value, end of year	$	718	$	717	$	278	$	272

Changes in Projected Benefit Obligations [Table Text Block]

The following table is a reconciliation of the benefit obligations for the years ended December 31 (in millions):

	Pension				Other Postretirement
	2020		2019		2020		2019
Benefit obligation, beginning of year	$	763	$	736	$	226	$	242
Service cost	8		6		4		5
Interest cost	25		30		7		10
Participant contributions	—		—		1		2
Actuarial (gain) loss	28		48		42		(13)
Acquisition	81		—		37		—
Benefits paid	(60)		(57)		(13)		(20)
Benefit obligation, end of year	$	845	$	763	$	304	$	226
Accumulated benefit obligation, end of year	$	773	$	758

Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]

The funded status of the plans and the amounts recognized on the Balance Sheets as of December 31 are as follows (in millions):

	Pension				Other Postretirement
	2020		2019		2020		2019
Plan assets at fair value, end of year	$	718	$	717	$	278	$	272
Less - Benefit obligation, end of year	845		763		304		226
Funded status	$	(127)	$	(46)	$	(26)	$	46
Amounts recognized on the Balance Sheets:
Other assets	$	—	$	66	$	—	$	46
Other current liabilities	(7)		(7)		—		—
Other liabilities	(120)		(105)		(26)		—
Amounts recognized	$	(127)	$	(46)	$	(26)	$	46

Net Periodic Benefit Costs Not Yet Recognized [Table Text Block]

The portion of the funded status of the plans not yet recognized in net periodic benefit cost as of December 31 is as follows (in millions):

	Pension				Other Postretirement
	2020		2019		2020		2019
Net loss (gain)	$	18	$	6	$	45	$	4
Prior service cost (credit)	—		(1)		(9)		(14)
Total	$	18	$	5	$	36	$	(10)

A reconciliation of the amounts not yet recognized as components of net periodic benefit cost for the years ended December 31, 2020 and 2019 is as follows (in millions):

	Regulatory Asset		Regulatory Liability		Receivables (Payables) with Affiliates		Total
Pension
Balance, December 31, 2018	$	25	$	—	$	16	$	41
Net (gain) loss arising during the year	(5)		(32)		2		(35)
Net amortization	(1)		—		—		(1)
Total	(6)		(32)		2		(36)
Balance, December 31, 2019	19		(32)		18		5
Net loss (gain) arising during the year	3		12		(1)		14
Net amortization	(1)		—		—		(1)
Total	2		12		(1)		13
Balance, December 31, 2020	$	21	$	(20)	$	17	$	18

	Regulatory Asset		Receivables (Payables) with Affiliates		Total
Other Postretirement
Balance, December 31, 2018	$	37	$	(9)	$	28
Net gain arising during the year	(33)		(9)		(42)
Net amortization	3		1		4
Total	(30)		(8)		(38)
Balance, December 31, 2019	7		(17)		(10)
Net loss arising during the year	34		7		41
Net amortization	4		1		5
Total	38		8		46
Balance, December 31, 2020	$	45	$	(9)	$	36

Plan Assumptions [Table Text Block]

Assumptions used to determine benefit obligations and net periodic benefit cost were as follows:

	Pension						Other Postretirement
	2020		2019		2018		2020		2019		2018
Benefit obligations as of December 31:
Discount rate	2.75	%	3.40	%	4.25	%	2.65	%	3.20	%	4.15	%
Rate of compensation increase	2.75	%	2.75	%	2.75	%	N/A		N/A		N/A
Interest crediting rates for cash balance plan
2018	N/A		N/A		2.26	%	N/A		N/A		N/A
2019	N/A		3.40	%	3.40	%	N/A		N/A		N/A
2020	2.27	%	2.27	%	3.40	%	N/A		N/A		N/A
2021	0.99	%	2.27	%	3.40	%	N/A		N/A		N/A
2022	0.99	%	2.27	%	3.40	%	N/A		N/A		N/A
2023 and beyond	0.99	%	2.27	%	3.40	%	N/A		N/A		N/A
Net periodic benefit cost for the years ended December 31:
Discount rate	3.40	%	4.25	%	3.60	%	3.20	%	4.15	%	3.50	%
Expected return on plan assets(1)	6.25	%	6.50	%	6.50	%	6.00	%	6.25	%	6.25	%
Rate of compensation increase	2.75	%	2.75	%	2.75	%	N/A		N/A		N/A
Interest crediting rates for cash balance plan	2.27	%	3.40	%	2.26	%	N/A		N/A		N/A

(1)Amounts reflected are pretax values. Assumed after-tax returns for a taxable, non-union other postretirement plan were 4.62% for 2020, 4.62% for 2019, and 4.13% for 2018.

In establishing its assumption as to the expected return on plan assets, MidAmerican Energy utilizes the asset allocation and return assumptions for each asset class based on historical performance and forward-looking views of the financial markets.

	2020		2019
Assumed healthcare cost trend rates as of December 31:
Healthcare cost trend rate assumed for next year	6.20	%	6.50	%
Rate that the cost trend rate gradually declines to	5.00	%	5.00	%
Year that the rate reaches the rate it is assumed to remain at	2025		2025

Expected Benefit Payments [Table Text Block]

Net periodic benefit costs assigned to MidAmerican Energy affiliates are reimbursed currently in accordance with its intercompany administrative services agreement. The expected benefit payments to participants in MidAmerican Energy's pension and other postretirement benefit plans for 2021 through 2025 and for the five years thereafter are summarized below (in millions):

	Projected Benefit Payments
	Pension		Other Postretirement
2021	$	64	$	20
2022	62		21
2023	60		22
2024	58		23
2025	56		22
2026-2030	248		104

Allocation of Plan Assets [Table Text Block]

The target allocations (percentage of plan assets) for MidAmerican Energy's pension and other postretirement benefit plan assets are as follows as of December 31, 2020:

	Pension	Other Postretirement
	%	%
Debt securities(1)	50-80	60-70
Equity securities(1)	20-50	30-40
Real estate funds	0-5	—
Other	0-5	0-5

(1)For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds are allocated based on the underlying investments in debt and equity securities.

Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The following table presents the fair value of plan assets, by major category, for MidAmerican Energy's defined benefit pension plan (in millions):

	Input Levels for Fair Value Measurements(1)
	Level 1		Level 2		Level 3		Total
As of December 31, 2020:
Cash equivalents	$	—	$	26	$	—	$	26
Debt securities:
United States government obligations	14		—		—		14
Corporate obligations	—		160		—		160
Municipal obligations	—		17		—		17
Equity securities:
United States companies	65		—		—		65
Total assets in the hierarchy	$	79	$	203	$	—	282
Investment funds(2) measured at net asset value							393
Real estate funds measured at net asset value							43
Total assets measured at fair value							$	718
As of December 31, 2019:
Cash equivalents	$	21	$	—	$	—	$	21
Debt securities:
United States government obligations	16		—		—		16
Corporate obligations	—		61		—		61
Municipal obligations	—		5		—		5
Agency, asset and mortgage-backed obligations	—		33		—		33
Equity securities:
United States companies	129		—		—		129
International companies	42		—		—		42
Investment funds(2)	69		—		—		69
Total assets in the hierarchy	$	277	$	99	$	—	376
Investment funds(2) measured at net asset value							299
Real estate funds measured at net asset value							42
Total assets measured at fair value							$	717

(1)Refer to Note 12 for additional discussion regarding the three levels of the fair value hierarchy.

(2)Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 65% and 35%, respectively, for 2020 and 69% and 31%, respectively, for 2019. Additionally, these funds are invested in United States and international securities of approximately 82% and 18%, respectively, for 2020 and 74% and 26%, respectively, for 2019.

The following table presents the fair value of plan assets, by major category, for MidAmerican Energy's defined benefit other postretirement plans (in millions):

	Input Levels for Fair Value Measurements(1)
	Level 1		Level 2		Level 3		Total
As of December 31, 2020:
Cash equivalents	$	11	$	—	$	—	$	11
Debt securities:
United States government obligations	3		—		—		3
Corporate obligations	—		7		—		7
Municipal obligations	—		65		—		65
Agency, asset and mortgage-backed obligations	—		3		—		3
Equity securities:
Investment funds(2)	189		—		—		189
Total assets measured at fair value	$	203	$	75	$	—	$	278
As of December 31, 2019:
Cash equivalents	$	6	$	—	$	—	$	6
Debt securities:
United States government obligations	6		—		—		6
Corporate obligations	—		12		—		12
Municipal obligations	—		55		—		55
Agency, asset and mortgage-backed obligations	—		10		—		10
Equity securities:
United States companies	75		—		—		75
Investment funds(2)	108		—		—		108
Total assets measured at fair value	$	195	$	77	$	—	$	272

(1)Refer to Note 12 for additional discussion regarding the three levels of the fair value hierarchy.

(2)Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 56% and 44%, respectively, for 2020 and 77% and 23%, respectively, for 2019. Additionally, these funds are invested in United States and international securities of approximately 56% and 44%, respectively, for 2020 and 42% and 58%, respectively, for 2019.

The following table presents MidAmerican Energy's assets and liabilities recognized on the Balance Sheets and measured at fair value on a recurring basis (in millions):

	Input Levels for Fair Value Measurements
	Level 1		Level 2		Level 3		Other(1)		Total
As of December 31, 2020:
Assets:
Commodity derivatives	$	—	$	4	$	5	$	(5)	$	4
Money market mutual funds(2)	41		—		—		—		41
Debt securities:
United States government obligations	200		—		—		—		200
International government obligations	—		5		—		—		5
Corporate obligations	—		73		—		—		73
Municipal obligations	—		2		—		—		2
Agency, asset and mortgage-backed obligations	—		6		—		—		6
Equity securities:
United States companies	381		—		—		—		381
International companies	9		—		—		—		9
Investment funds	17		—		—		—		17
	$	648	$	90	$	5	$	(5)	$	738
Liabilities - commodity derivatives	$	—	$	(4)	$	(3)	$	5	$	(2)
As of December 31, 2019
Assets:
Commodity derivatives	$	—	$	2	$	1	$	(1)	$	2
Money market mutual funds(2)	274		—		—		—		274
Debt securities:
United States government obligations	189		—		—		—		189
International government obligations	—		4		—		—		4
Corporate obligations	—		58		—		—		58
Municipal obligations	—		1		—		—		1
Agency, asset and mortgage-backed obligations	—		1		—		—		1
Equity securities:
United States companies	336		—		—		—		336
International companies	9		—		—		—		9
Investment funds	15		—		—		—		15
	$	823	$	66	$	1	$	(1)	$	889
Liabilities - commodity derivatives	$	—	$	(9)	$	—	$	2	$	(7)

(1)Represents netting under master netting arrangements and a net cash collateral receivable of $— million and $1 million as of December 31, 2020 and 2019, respectively.

(2)Amounts are included in cash and cash equivalents and investments and restricted investments on the Balance Sheets. The fair value of these money market mutual funds approximates cost.

MidAmerican Funding, LLC and Subsidiaries [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Benefit Costs [Table Text Block]

Pension and postretirement costs allocated by MidAmerican Funding to its parent and other affiliates in each of the years ended December 31, were as follows (in millions):

	2020		2019		2018
Pension costs	$	7	$	4	$	3
Other postretirement costs	(3)		(2)		(2)

Eastern Energy Gas Holdings, LLC [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Benefit Costs [Table Text Block]

Net periodic benefit cost for the plans included the following components for the years ended December 31 (in millions):

	Pension						Other Postretirement
	2020		2019		2018		2020		2019		2018
Service cost	$	5	$	6	$	18	$	1	$	1	$	4
Interest cost	8		11		29		4		5		11
Expected return on plan assets	(47)		(54)		(150)		(16)		(16)		(28)
Settlement	—		1		—		—		1		—
Net amortization	5		7		19		(3)		(2)		(1)
Net periodic benefit cost (credit)	$	(29)	$	(29)	$	(84)	$	(14)	$	(11)	$	(14)

Changes in Fair Value of Plan Assets [Table Text Block]

The following table is a reconciliation of the fair value of plan assets for the year ended December 31 (in millions):

	Pension		Other Postretirement
	2019		2019
Plan assets at fair value, beginning of year	$	1,656	$	311
Dominion Energy Gas Restructuring	(1,084)		(126)
Employer contributions	—		12
Actual return on plan assets	129		38
Benefits paid	(15)		(8)
Plan assets at fair value, end of year	$	686	$	227

Changes in Projected Benefit Obligations [Table Text Block]

The following table is a reconciliation of the benefit obligations for the year ended December 31 (in millions):

	Pension		Other Postretirement
	2019		2019
Benefit obligation, beginning of year	$	730	$	256
Dominion Energy Gas Restructuring	(468)		(135)
Service cost	6		1
Interest cost	11		5
Actuarial loss	30		1
Settlement	1		1
Benefits paid	(15)		(8)
Benefit obligation, end of year	$	295	$	121

Schedule of Net Funded Status [Table Text Block]

The funded status of the plans and the amounts recognized on the Consolidated Balance Sheets as of December 31 are as follows (in millions):

	Pension			Other Postretirement
	2019			2019
Plan assets at fair value, end of year	$	686		$	227
Less - Benefit obligation, end of year	295			121
Funded status	$	391		$	106
Amounts recognized on the Consolidated Balance Sheets:
Other assets	$	391		$	106
Amounts recognized	$	391		$	106
Significant assumptions used to determine benefit obligations:
Discount rate	3.63		%	3.44		%
Weighted average rate of increase for compensation	4.64		%	n/a

Net Periodic Benefit Costs Not Yet Recognized [Table Text Block]

The portion of the funded status of the plans not yet recognized in net periodic benefit cost as of December 31 is as follows (in millions):

	Pension		Other Postretirement
	2019		2019
Net loss	$	150	$	44
Prior service cost (credit)	—		(49)
Total(1)	$	150	$	(5)

(1)As of December 31, 2019, of the $150 million related to pension benefits, $147 million is included in AOCI, with the remainder included in regulatory assets and liabilities and the $(5) million related to other postretirement benefits is included entirely in regulatory assets and liabilities.

Plan Assumptions [Table Text Block]

Significant assumptions used to determine periodic credits for the years ended December 31:

	Pension						Other Postretirement
	2020		2019		2018		2020		2019		2018
Discount rate	3.16% - 3.63%		4.10% - 4.42%		3.81	%	3.44	%	4.05% - 4.37%		3.81	%
Expected long-term rate of return on plan assets	8.60	%	8.65	%	8.75	%	8.50	%	8.50	%	8.50	%
Weighted average rate of increase for compensation	4.73	%	4.55	%	4.11	%	n/a		n/a		n/a
Healthcare cost trend rate							6.50	%	6.50	%	7.00	%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)							5.00	%	5.00	%	5.00	%
Year that the rate reached the ultimate trend rate							2026		2025		2022

Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The following table presents the fair value of plan assets, by major category, for Eastern Energy Gas' defined benefit pension plan as of December 31, 2019 (in millions):

	Input Levels for Fair Value Measurements
	Level 1(1)		Level 2(1)		Level 3(1)		Total
Cash and cash equivalents	$	1	$	—	$	—	$	1
Debt securities:
United States government obligations	2		59		—		61
Corporate obligations	3		66		—		69
Insurance contracts	—		28		—		28
Equity securities:
United States equity securities	177		—		—		177
International equity securities	114		—		—		114
Total assets in the fair value hierarchy	$	297	$	153	$	—	450
Investment funds measured at net asset value							238
Investments at fair value							$	688

(1)Refer to Note 15 for additional discussion regarding the three levels of the fair value hierarchy.

The following table presents the fair value of plan assets, by major category, for Eastern Energy Gas' defined benefit other postretirement plan as of December 31, 2019 (in millions):

	Input Levels for Fair Value Measurements
	Level 1(1)		Level 2(1)		Level 3(1)		Total
Equity securities:
United States equity securities	$	86	$	—	$	—	$	86
International equity securities	21		—		—		21
Total assets in the fair value hierarchy	$	107	$	—	$	—	107
Investment funds measured at net asset value							120
Investments at fair value							$	227

(1)Refer to Note 15 for additional discussion regarding the three levels of the fair value hierarchy.