Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2018

Schedule Of Regulatory Assets and Liabilities [Line Items]

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	2018		2017

Employee benefit plans⁽¹⁾	16 years	$	773	$	675
Asset retirement obligations	17 years	375		334
Asset disposition costs	Various	358		387
Deferred income taxes⁽²⁾	Various	196		143
Deferred operating costs	10 years	141		147
Abandoned projects	2 years	134		156
Unrealized loss on regulated derivative contracts	2 years	120		122
Deferred net power costs	2 years	103		58
Unamortized contract values	5 years	79		89
Other	Various	788		839
Total regulatory assets		$	3,067	$	2,950

Reflected as:
Current assets		$	171	$	189
Noncurrent assets		2,896		2,761
Total regulatory assets		$	3,067	$	2,950


(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.


(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.

Regulatory Liabilities [Table Text Block]

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	2018		2017

Deferred income taxes⁽¹⁾	Various	$	3,923	$	4,143
Cost of removal⁽²⁾	28 years	2,426		2,349
Levelized depreciation	30 years	329		332
Asset retirement obligations	34 years	163		177
Impact fees	4 years	88		89
Other	Various	577		421
Total regulatory liabilities		$	7,506	$	7,511

Reflected as:
Current liabilities		$	160	$	202
Noncurrent liabilities		7,346		7,309
Total regulatory liabilities		$	7,506	$	7,511

(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. See Note 11 for further discussion of 2017 Tax Reform impacts.


(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.

PacifiCorp [Member]

Schedule Of Regulatory Assets and Liabilities [Line Items]

Regulatory Assets [Table Text Block]

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	2018		2017

Employee benefit plans⁽¹⁾	20 years	$	448	$	418
Utah mine disposition⁽²⁾	Various	136		156
Unamortized contract values	5 years	79		89
Deferred net power costs	3 year	62		21
Unrealized loss on derivative contracts	2 years	96		101
Asset retirement obligation	31 years	119		100
Other	Various	172		176
Total regulatory assets		$	1,112	$	1,061

Reflected as:
Current assets		$	36	$	31
Noncurrent assets		1,076		1,030
Total regulatory assets		$	1,112	$	1,061


(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 net property, plant and equipment not considered probable of disallowance and for the portion of losses associated with the assets held for sale, UMWA 1974 Pension Plan withdrawal and closure costs incurred to date considered probable of recove

Regulatory Liabilities [Table Text Block]

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	2018		2017

Cost of removal⁽¹⁾	26 years	$	994	$	955
Deferred income taxes⁽²⁾	Various	1,803		1,960
Other	Various	258		156
Total regulatory liabilities		$	3,055	$	3,071

Reflected as:
Current liabilities		$	77	$	75
Noncurrent liabilities		2,978		2,996
Total regulatory liabilities		$	3,055	$	3,071


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

MidAmerican Energy Company [Member]

Schedule Of Regulatory Assets and Liabilities [Line Items]

Regulatory Assets [Table Text Block]

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):



	Average
	Remaining Life	2018		2017

Asset retirement obligations⁽¹⁾	12 years	$	160	$	133
Employee benefit plans⁽²⁾	14 years	62		38
Unrealized loss on regulated derivative contracts	1 year	19		6
Other	Various	32		27
Total		$	273	$	204


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


(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.

Regulatory Liabilities [Table Text Block]

latory liabilities represent income to be recognized or amounts 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):



	Average
	Remaining Life	2018		2017

Cost of removal accrual⁽¹⁾	29 years	$	708	$	688
Deferred income taxes⁽²⁾	29 years	626		681
Asset retirement obligations⁽³⁾	34 years	160		173
Employee benefit plans⁽⁴⁾	N/A	—		41
Pre-funded AFUDC on transmission MVPs⁽⁵⁾	54 years	36		35
Iowa electric revenue sharing accrual⁽⁶⁾	1 year	70		26
Other	Various	20		17
Total		$	1,620	$	1,661


(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)

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. See Note 9 for further discussion of 2017 Tax Reform impacts.


(3)	Amount predominantly represents the excess of nuclear decommission trust assets over the related asset retirement obligation. Refer to Note 11 for a discussion of asset retirement obligations.


(4)	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.


(5)	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.


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

Nevada Power Company [Member]

Schedule Of Regulatory Assets and Liabilities [Line Items]

Regulatory Assets [Table Text Block]

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	2018		2017

Decommissioning costs⁽²⁾	5 years	$	222	$	231
Deferred operating costs	10 years	152		169
Merger costs from 1999 merger	26 years	125		130
Employee benefit plans⁽¹⁾	8 years	105		89
Asset retirement obligations	7 years	68		72
Abandoned projects	2 years	46		58
Legacy meters	14 years	53		56
ON Line deferrals	35 years	46		47
Deferred energy costs	1 year	47		46
Other	Various	53		71
Total regulatory assets		$	917	$	969

Reflected as:
Current assets		$	39	$	28
Other assets		878		941
Total regulatory assets		$	917	$	969


(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.


(2)	Amount includes regulatory assets with an indeterminate life of $81 million as of December 31, 2018.

Regulatory Liabilities [Table Text Block]

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	2018		2017

Deferred income taxes⁽¹⁾	27 years	$	677	$	670
Cost of removal⁽²⁾	33 years	320		307
Impact fees⁽³⁾	4 years	86		89
Energy efficiency program	1 year	24		27
Other	Various	79		28
Total regulatory liabilities		$	1,186	$	1,121

Reflected as:
Current liabilities		$	49	$	91
Other long-term liabilities		1,137		1,030
Total regulatory liabilities		$	1,186	$	1,121

(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. Amount includes regulatory liabilities with an indeterminate life of $82 million as of December 31, 2018. See Note 9 for further discussion of 2017 Tax Reform impacts.


(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.


(3)	Amounts reduce rate base or otherwise accrue a carrying cost.

Sierra Pacific Power Company [Member]

Schedule Of Regulatory Assets and Liabilities [Line Items]

Regulatory Assets [Table Text Block]

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



	Weighted
	Average
	Remaining Life	2018		2017

Employee benefit plans⁽¹⁾	8 years	$	132	$	110
Merger costs from 1999 merger	28 years	74		77
Abandoned projects	7 years	29		34
Renewable energy programs	1 year	4		23
Losses on reacquired debt	16 years	19		21
Other	Various	63		67
Total regulatory assets		$	321	$	332

Reflected as:
Current assets		$	7	$	32
Other assets		314		300
Total regulatory assets		$	321	$	332


(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.

Regulatory Liabilities [Table Text Block]

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



	Weighted
	Average
	Remaining Life	2018		2017

Deferred income taxes⁽¹⁾	28 years	$	270	$	264
Cost of removal⁽²⁾	40 years	210		211
Deferred energy costs	1 year	—		8
Other	Various	29		17
Total regulatory liabilities		$	509	$	500

Reflected as:
Current liabilities		$	18	$	19
Other long-term liabilities		491		481
Total regulatory liabilities		$	509	$	500

(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. Amount includes regulatory liabilities with an indeterminate life of $21 million and $- million as of December 31, 2018 and 2017, respectively. See Note 9 for further discussion of 2017 Tax Reform impacts.


(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.