Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2021

Schedule Of Regulatory Assets and Liabilities [Line Items]

Schedule of Regulatory Assets

Regulatory assets represent costs that are expected to be recovered in future regulated rates. The Company's regulatory assets reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions):

	Weighted
	Average
	Remaining Life	2021		2020
Asset retirement obligations	14 years	$	742	$	640
Deferred net power costs	1 year	531		139
Employee benefit plans(1)	15 years	472		722
Deferred income taxes(2)	Various	342		283
Asset disposition costs	Various	285		347
Demand side management	10 years	211		197
Unrealized loss on regulated derivative contracts	Various	157		31
Environmental costs	28 years	108		89
Deferred operating costs	9 years	103		124
Other	Various	1,012		868
Total regulatory assets		$	3,963	$	3,440
Reflected as:
Current assets		$	544	$	283
Noncurrent assets		3,419		3,157
Total regulatory assets		$	3,963	$	3,440

(1)Includes amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in regulated rates when recognized.

(2)Amounts primarily represent income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse.

Schedule of Regulatory Liabilities

Regulatory liabilities represent income to be recognized or amounts to be returned to customers in future periods. The Company's regulatory liabilities reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions):

	Weighted
	Average
	Remaining Life	2021		2020
Deferred income taxes(1)	Various	$	3,185	$	3,600
Cost of removal(2)	26 years	2,424		2,435
Asset retirement obligations	31 years	345		305
Levelized depreciation	29 years	259		281
Employee benefit plans(3)	Various	243		187
Other	Various	758		667
Total regulatory liabilities		$	7,214	$	7,475
Reflected as:
Current liabilities		$	254	$	254
Noncurrent liabilities		6,960		7,221
Total regulatory liabilities		$	7,214	$	7,475

(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse.

(2)Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying cost.

(3)Includes amounts not yet recognized as a component of net periodic benefit cost that are expected to be returned to customers in future periods when recognized.

PAC

Schedule Of Regulatory Assets and Liabilities [Line Items]

Schedule of Regulatory Assets

Regulatory assets represent costs that are expected to be recovered in future rates. PacifiCorp's regulatory assets reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions):

	Weighted
	Average
	Remaining
	Life	2021		2020
Employee benefit plans(1)	17 years	$	286	$	432
Utah mine disposition(2)	Various	116		117
Unamortized contract values	2 years	36		42
Deferred net power costs	2 years	151		78
Unrealized loss on derivative contracts	N/A	—		17
Environmental costs	28 years	108		89
Asset retirement obligation	29 years	241		252
Demand side management (DSM)(3)	10 years	211		196
Other	Various	203		172
Total regulatory assets		$	1,352	$	1,395
Reflected as:
Current assets		$	65	$	116
Noncurrent assets		1,287		1,279
Total regulatory assets		$	1,352	$	1,395

(1)Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in rates when recognized.

(2)Amounts represent regulatory assets established as a result of the Utah mine disposition in 2015 for the United Mine Workers of America ("UMWA") 1974 Pension Plan withdrawal and closure costs incurred to date considered probable of recovery.

(3)In accordance with the Utah general rate case order issued in December 2020, $185 million of amounts billed to Utah customers under the Utah STEP program were used to accelerate depreciation of certain coal-fueled generation units as discussed in Note 3.

Schedule of Regulatory Liabilities

Regulatory liabilities represent income to be recognized or amounts to be returned to customers in future periods. PacifiCorp's regulatory liabilities reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions):

	Weighted
	Average
	Remaining
	Life	2021		2020
Cost of removal(1)	26 years	$	1,187	$	1,125
Deferred income taxes(2)	Various	1,307		1,463
Unrealized gain on regulated derivatives	1 year	53		—
Other	Various	221		254
Total regulatory liabilities		$	2,768	$	2,842
Reflected as:
Current liabilities		$	118	$	115
Noncurrent liabilities		2,650		2,727
Total regulatory liabilities		$	2,768	$	2,842

(1)Amounts represent estimated costs, as generally accrued through depreciation rates, of removing property, plant and equipment in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying cost.

(2)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable of being passed on to customers, offset by income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse.

MEC

Schedule Of Regulatory Assets and Liabilities [Line Items]

Schedule of Regulatory Assets

Regulatory assets represent costs that are expected to be recovered in future regulated rates. MidAmerican Energy's regulatory assets reflected on the Balance Sheets consist of the following as of December 31 (in millions):

	Weighted
	Average
	Remaining Life	2021		2020
Asset retirement obligations(1)	6 years	$	393	$	298
Employee benefit plans(2)	13 years	42		66
Unrealized loss on regulated derivative contracts	1 year	5		—
Other	Various	33		28
Total		$	473	$	392

(1)Amount predominantly relates to AROs for fossil-fueled and wind-powered generating facilities. Refer to Note 11 for a discussion of AROs.

(2)Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in regulated rates when recognized.

Schedule of Regulatory Liabilities

Regulatory liabilities represent amounts expected to be returned to customers in future periods. MidAmerican Energy's regulatory liabilities reflected on the Balance Sheets consist of the following as of December 31 (in millions):

	Weighted
	Average
	Remaining Life	2021		2020
Cost of removal accrual(1)	29 years	$	394	$	466
Asset retirement obligations(2)	31 years	341		300
Iowa electric revenue sharing accrual(3)	1 year	115		—
Deferred income taxes(4)	Various	83		263
Employee benefit plans(5)	9 years	55		20
Pre-funded AFUDC on transmission MVPs(6)	51 years	34		35
Unrealized gain on regulated derivative contracts	1 year	26		2
Other	Various	32		25
Total		$	1,080	$	1,111

(1)Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing utility plant in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying cost.

(2)Amount represents the excess of nuclear decommission trust assets over the related ARO. Refer to Note 11 for a discussion of AROs.

(3)Represents current-year accruals under a regulatory arrangement in Iowa in which equity returns exceeding specified thresholds reduce utility plant upon final determination.

(4)Amounts primarily represent income tax liabilities primarily related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to state accelerated tax depreciation and certain property-related basis differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse.

(5)Represents amounts not yet recognized as a component of net periodic benefit cost that are to be returned to customers in future periods when recognized.

(6)Represents AFUDC accrued on transmission MVPs that is deducted from rate base as a result of the inclusion of related construction work-in-progress in rate base.

NPC

Schedule Of Regulatory Assets and Liabilities [Line Items]

Schedule of Regulatory Assets

Regulatory assets represent costs that are expected to be recovered in future rates. Nevada Power's regulatory assets reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions):

	Weighted
	Average
	Remaining Life	2021		2020
Deferred energy costs	1 year	$	273	$	39
Decommissioning costs	2 years	169		230
Unrealized loss on regulated derivative contracts	1 year	117		11
Merger costs from 1999 merger	23 years	110		115
Deferred operating costs	12 years	93		119
Asset retirement obligations	6 years	73		70
ON Line deferrals	32 years	42		43
Legacy meters	11 years	41		45
Employee benefit plans(1)	8 years	11		50
Other	Various	90		72
Total regulatory assets		$	1,019	$	794
Reflected as:
Current assets		$	291	$	48
Noncurrent assets		728		746
Total regulatory assets		$	1,019	$	794

(1)Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in regulated rates when recognized.

Schedule of Regulatory Liabilities

Regulatory liabilities represent amounts that are expected to be returned to customers in future periods. Nevada Power's regulatory liabilities reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions):

	Weighted
	Average
	Remaining Life	2021		2020
Deferred income taxes(1)	Various	$	603	$	647
Cost of removal(2)	31 years	348		340
Other	Various	198		226
Total regulatory liabilities		$	1,149	$	1,213
Reflected as:
Current liabilities		$	49	$	50
Noncurrent liabilities		1,100		1,163
Total regulatory liabilities		$	1,149	$	1,213

(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to accelerated tax depreciation and certain property-related basis differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse.

(2)Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices.

SPPC

Schedule Of Regulatory Assets and Liabilities [Line Items]

Schedule of Regulatory Assets

Regulatory assets represent costs that are expected to be recovered in future rates. Sierra Pacific's regulatory assets reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions):

	Weighted
	Average
	Remaining Life	2021		2020
Deferred energy costs	1 year	$	107	$	22
Merger costs from 1999 merger	25 years	66		68
Natural disaster protection plan	1 year	62		45
Employee benefit plans(1)	8 years	46		81
Unrealized loss on regulated derivative contracts	1 year	35		2
Deferred operating costs	8 years	31		27
Abandoned projects	5 years	19		22
Other	Various	74		67
Total regulatory assets		$	440	$	334
Reflected as:
Current assets		$	177	$	67
Noncurrent assets		263		267
Total regulatory assets		$	440	$	334

(1)Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in regulated rates when recognized.

Schedule of Regulatory Liabilities

Regulatory liabilities represent amounts that are expected to be returned to customers in future periods. Sierra Pacific's regulatory liabilities reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions):

	Weighted
	Average
	Remaining Life	2021		2020
Deferred income taxes(1)	Various	$	234	$	249
Cost of removal(2)	36 years	201		197
Other	Various	28		51
Total regulatory liabilities		$	463	$	497
Reflected as:
Current liabilities		$	19	$	34
Noncurrent liabilities		444		463
Total regulatory liabilities		$	463	$	497

(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to accelerated tax depreciation and certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse.

(2)Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices.

EEGH

Schedule Of Regulatory Assets and Liabilities [Line Items]

Schedule of Regulatory Assets

Eastern Energy Gas' regulatory assets reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions):

	Weighted Average Remaining Life	2021		2020
Employee benefit plans(1)	14 years	$	62	$	70
Other	Various	12		12
Total regulatory assets		$	74	$	82
Reflected as:
Other current assets		$	6	$	8
Other assets		68		74
Total regulatory assets		$	74	$	82

(1)Represents costs expected to be recovered through future rates generally over the expected remaining service period of plan participants by certain rate-regulated subsidiaries.

Schedule of Regulatory Liabilities

Eastern Energy Gas' regulatory liabilities reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions):

	Weighted Average Remaining Life	2021		2020
Income taxes refundable through future rates(1)	Various	$	468	$	473
Other postretirement benefit costs(2)	Various	116		115
Cost of removal(3)	44 years	73		88
Other	Various	28		33
Total regulatory liabilities		$	685	$	709
Reflected as:
Current liabilities		$	40	$	40
Noncurrent liabilities		645		669
Total regulatory liabilities		$	685	$	709

(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse.

(2)Reflects a regulatory liability for the collection of postretirement benefit costs allowed in rates in excess of expense incurred.

(3)Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices.