Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Schedule of Effective Income Tax Rate Reconciliation [Line Items]

Components of Income Tax Expense (Benefit) [Table Text Block]

Income tax (benefit) expense consists of the following for the years ended December 31 (in millions):

	2018			2017			2016
Current:
Federal	$	(686	)	$	(653	)	$	(743	)
State	(9		)	(3		)	1
Foreign	104			83			55
	(591		)	(573		)	(687		)
Deferred:
Federal	165			(76		)	1,164
State	(131		)	100			(59		)
Foreign	(20		)	2			(7		)
	14			26			1,098
Investment tax credits	(6		)	(7		)	(8		)
Total	$	(583	)	$	(554	)	$	403

Effective Income Tax Rate Reconciliation [Table Text Block]

A reconciliation of the federal statutory income tax rate to the effective income tax rate applicable to income before income tax (benefit) expense is as follows for the years ended December 31:

	2018		2017		2016
Federal statutory income tax rate	21	%	35	%	35	%
Income tax credits	(30	)	(20	)	(14	)
Effects of ratemaking	(8	)	(1	)	—
State income tax, net of federal income tax benefit	(6	)	3		(1	)
Effects of tax rate change and repatriation tax	(4	)	(31	)	—
Income tax effect of foreign income	(3	)	(5	)	(6	)
Equity income	1		(2	)	2
Other, net	(1	)	(1	)	(2	)
Effective income tax rate	(30	)%	(22	)%	14	%

Components of Net Deferred Income Tax Liability [Table Text Block]

The net deferred income tax liability consists of the following as of December 31 (in millions):

	2018			2017
Deferred income tax assets:
Regulatory liabilities	$	1,674		$	1,707
Federal, state and foreign carryforwards	596			1,118
AROs	232			223
Employee benefits	68			45
Other	459			450
Total deferred income tax assets	3,029			3,543
Valuation allowances	(137		)	(126		)
Total deferred income tax assets, net	2,892			3,417
Deferred income tax liabilities:
Property-related items	(10,185		)	(9,950		)
Investments	(876		)	(843		)
Regulatory assets	(656		)	(651		)
Other	(222		)	(215		)
Total deferred income tax liabilities	(11,939		)	(11,659		)
Net deferred income tax liability	$	(9,047	)	$	(8,242	)

Summary of Operating Loss Carryforwards [Table Text Block]

The following table provides the Company's net operating loss and tax credit carryforwards and expiration dates as of December 31, 2018 (in millions):

	Federal		State		Foreign		Total
Net operating loss carryforwards(1)	$	284	$	5,577	$	562	$	6,423
Deferred income taxes on net operating loss carryforwards	$	60	$	312	$	151	$	523
Expiration dates	2023-2026		2019-2038		2035-2038
Tax credits	$	45	$	28	$	—	$	73
Expiration dates	2023- indefinite		2019- indefinite

(1) The federal net operating loss carryforwards relate principally to net operating loss carryforwards of subsidiaries that are tax residents in both the United States and the United Kingdom. The federal net operating loss carryforwards were generated prior to Berkshire Hathaway Inc.'s ownership and will begin to expire in 2023.

Net Unrecognized Tax Benefits Roll Forward [Table Text Block]

A reconciliation of the beginning and ending balances of the Company's net unrecognized tax benefits is as follows for the years ended December 31 (in millions):

	2018			2017
Beginning balance	$	181		$	128
Additions based on tax positions related to the current year	4			6
Additions for tax positions of prior years	38			70
Reductions for tax positions of prior years	(38		)	(18		)
Statute of limitations	2			(4		)
Settlements	(2		)	(1		)
Ending balance	$	185		$	181

PacifiCorp [Member]

Schedule of Effective Income Tax Rate Reconciliation [Line Items]

Components of Income Tax Expense (Benefit) [Table Text Block]

Income tax expense (benefit) consists of the following for the years ended December 31 (in millions):

	2018			2017			2016
Current:
Federal	$	164		$	249		$	169
State	40			41			32
Total	204			290			201
Deferred:
Federal	(187		)	59			123
State	(9		)	15			21
Total	(196		)	74			144
Investment tax credits	(3		)	(4		)	(5		)
Total income tax expense	$	5		$	360		$	340

Effective Income Tax Rate Reconciliation [Table Text Block]

A reconciliation of the federal statutory income tax rate to the effective income tax rate applicable to income before income tax expense is as follows for the years ended December 31:

	2018		2017		2016
Federal statutory income tax rate	21	%	35	%	35	%
State income taxes, net of federal income tax benefit	4		3		3
Amortization of excess deferred income taxes	(17	)	—		—
Federal income tax credits	(7	)	(5	)	(6	)
Other	—		(1	)	(1	)
Effective income tax rate	1	%	32	%	31	%

Components of Net Deferred Income Tax Liability [Table Text Block]

The net deferred income tax liability consists of the following as of December 31 (in millions):

	2018			2017
Deferred income tax assets:
Regulatory liabilities	$	752		$	756
Employee benefits	91			84
Derivative contracts and unamortized contract values	45			48
State carryforwards	77			83
Asset retirement obligations	53			50
Other	56			50
	1,074			1,071
Deferred income tax liabilities:
Property, plant and equipment	(3,335		)	(3,381		)
Regulatory assets	(273		)	(261		)
Other	(9		)	(11		)
	(3,617		)	(3,653		)
Net deferred income tax liability	$	(2,543	)	$	(2,582	)

Summary of Operating Loss Carryforwards [Table Text Block]

The following table provides PacifiCorp's net operating loss and tax credit carryforwards and expiration dates as of December 31, 2018 (in millions):

	State
Net operating loss carryforwards	$	1,230
Deferred income taxes on net operating loss carryforwards	$	58
Expiration dates	2019 - 2032
Tax credit carryforwards	$	19
Expiration dates	2019 - indefinite

MidAmerican Energy Company [Member]

Schedule of Effective Income Tax Rate Reconciliation [Line Items]

Components of Income Tax Expense (Benefit) [Table Text Block]

MidAmerican Energy's income tax benefit from continuing operations consists of the following for the years ended December 31 (in millions):

	2018			2017			2016
Current:
Federal	$	(276	)	$	(490	)	$	(479	)
State	(12		)	(25		)	(14		)
	(288		)	(515		)	(493		)
Deferred:
Federal	42			335			366
State	(8		)	(2		)	(4		)
	34			333			362
Investment tax credits	(1		)	(1		)	(1		)
Total	$	(255	)	$	(183	)	$	(132	)

Effective Income Tax Rate Reconciliation [Table Text Block]

A reconciliation of the federal statutory income tax rate to MidAmerican Energy's effective income tax rate applicable to income before income tax benefit from continuing operations is as follows for the years ended December 31:

	2018		2017		2016
Federal statutory income tax rate	21	%	35	%	35	%
Income tax credits	(73	)	(68	)	(61	)
State income tax, net of federal income tax benefit	(4	)	(4	)	(3	)
Effects of ratemaking	(5	)	(7	)	(3	)
2017 Tax Reform	1		2		—
Other, net	—		(1	)	—
Effective income tax rate	(60	)%	(43	)%	(32	)%

Components of Net Deferred Income Tax Liability [Table Text Block]

MidAmerican Energy's net deferred income tax liability consists of the following as of December 31 (in millions):

	2018			2017
Deferred income tax assets:
Regulatory liabilities	$	405		$	443
Asset retirement obligations	164			160
Employee benefits	47			45
Other	80			57
Total deferred income tax assets	696			705
Deferred income tax liabilities:
Depreciable property	(2,945		)	(2,865		)
Regulatory assets	(61		)	(42		)
Other	(12		)	(35		)
Total deferred income tax liabilities	(3,018		)	(2,942		)
Net deferred income tax liability	$	(2,322	)	$	(2,237	)

Net Unrecognized Tax Benefits Roll Forward [Table Text Block]

A reconciliation of the beginning and ending balances of MidAmerican Energy's net unrecognized tax benefits is as follows for the years ended December 31 (in millions):

	2018			2017
Beginning balance	$	12		$	10
Additions based on tax positions related to the current year	4			1
Additions for tax positions of prior years	47			23
Reductions based on tax positions related to the current year	(4		)	(4		)
Reductions for tax positions of prior years	(48		)	(19		)
Interest and penalties	(1		)	1
Ending balance	$	10		$	12

MidAmerican Funding, LLC and Subsidiaries [Domain]

Schedule of Effective Income Tax Rate Reconciliation [Line Items]

Components of Income Tax Expense (Benefit) [Table Text Block]

MidAmerican Funding's income tax benefit from continuing operations consists of the following for the years ended December 31 (in millions):

	2018			2017			2016
Current:
Federal	$	(280	)	$	(505	)	$	(485	)
State	(14		)	(31		)	(16		)
	(294		)	(536		)	(501		)
Deferred:
Federal	42			338			367
State	(9		)	(3		)	(4		)
	33			335			363
Investment tax credits	(1		)	(1		)	(1		)
Total	$	(262	)	$	(202	)	$	(139	)

Effective Income Tax Rate Reconciliation [Table Text Block]

A reconciliation of the federal statutory income tax rate MidAmerican Funding's the effective income tax rate applicable to income before income tax benefit from continuing operations is as follows for the years ended December 31:

	2018		2017		2016
Federal statutory income tax rate	21	%	35	%	35	%
Income tax credits	(76	)	(77	)	(64	)
State income tax, net of federal income tax benefit	(4	)	(6	)	(3	)
Effects of ratemaking	(6	)	(8	)	(3	)
2017 Tax Reform	1		3		—
Other, net	—		(1	)	—
Effective income tax rate	(64	)%	(54	)%	(35	)%

Components of Net Deferred Income Tax Liability [Table Text Block]

MidAmerican Funding's net deferred income tax liability consists of the following as of December 31 (in millions):

	2018			2017
Deferred income tax assets:
Regulatory liabilities	$	405		$	443
Asset retirement obligations	164			160
Employee benefits	47			45
Other	85			62
Total deferred income tax assets	701			710
Deferred income tax liabilities:
Depreciable property	(2,947		)	(2,868		)
Regulatory assets	(62		)	(42		)
Other	(11		)	(35		)
Total deferred income tax liabilities	(3,020		)	(2,945		)
Net deferred income tax liability	$	(2,319	)	$	(2,235	)

Net Unrecognized Tax Benefits Roll Forward [Table Text Block]

A reconciliation of the beginning and ending balances of MidAmerican Funding's net unrecognized tax benefits is as follows for the years ended December 31 (in millions):

	2018			2017
Beginning balance	$	12		$	10
Additions based on tax positions related to the current year	4			1
Additions for tax positions of prior years	47			23
Reductions based on tax positions related to the current year	(4		)	(4		)
Reductions for tax positions of prior years	(48		)	(19		)
Interest and penalties	(1		)	1
Ending balance	$	10		$	12

Nevada Power Company [Member]

Schedule of Effective Income Tax Rate Reconciliation [Line Items]

Components of Income Tax Expense (Benefit) [Table Text Block]

Income tax expense (benefit) consists of the following for the years ended December 31 (in millions):

	2018			2017			2016
Current – Federal	$	84		$	62		$	68
Deferred – Federal	(13		)	95			79
Uncertain tax positions	2			—			—
Investment tax credits	(1		)	(1		)	(1		)
Total income tax expense	$	72		$	156		$	146

Effective Income Tax Rate Reconciliation [Table Text Block]

A reconciliation of the federal statutory income tax rate to the effective income tax rate applicable to income before income tax expense is as follows for the years ended December 31:

	2018		2017		2016
Federal statutory income tax rate	21	%	35	%	35	%
Non-deductible expenses	3		—		—
Effect of ratemaking	—		1		—
Effect of tax rate change	—		1		—
Other	—		1		(1	)
Effective income tax rate	24	%	38	%	34	%

Components of Net Deferred Income Tax Liability [Table Text Block]

The net deferred income tax liability consists of the following as of December 31 (in millions):

	2018			2017
Deferred income tax assets:
Regulatory liabilities	$	209		$	201
Capital and financial leases	97			100
Employee benefits	15			18
Customer advances	18			14
Other	9			6
Total deferred income tax assets	348			339
Deferred income tax liabilities:
Property related items	(799		)	(796		)
Regulatory assets	(196		)	(206		)
Capital and financial leases	(94		)	(97		)
Other	(8		)	(7		)
Total deferred income tax liabilities	(1,097		)	(1,106		)
Net deferred income tax liability	$	(749	)	$	(767	)

Sierra Pacific Power Company [Member]

Schedule of Effective Income Tax Rate Reconciliation [Line Items]

Components of Income Tax Expense (Benefit) [Table Text Block]

Income tax expense (benefit) consists of the following for the years ended December 31 (in millions):

	2018			2017			2016
Current – Federal	$	23		$	—		$	—
Deferred – Federal	7			56			50
Uncertain tax positions	1			—			—
Investment tax credits	(1		)	(1		)	(1		)
Total income tax expense	$	30		$	55		$	49

Effective Income Tax Rate Reconciliation [Table Text Block]

A reconciliation of the federal statutory income rate to the effective income tax rate applicable to income before income tax expense is as follows for the years ended December 31:

	2018		2017		2016
Federal statutory income tax rate	21	%	35	%	35	%
Non-deductible expenses	4		—		—
Effects of ratemaking	—		—		1
Effect of tax rate change	—		(1	)	—
Other	—		—		1
Effective income tax rate	25	%	34	%	37	%

Components of Net Deferred Income Tax Liability [Table Text Block]

The net deferred income tax liability consists of the following as of December 31 (in millions):

	2018			2017
Deferred income tax assets:
Regulatory liabilities	$	70		$	67
Federal net operating loss and credit carryforwards	—			10
Employee benefit plans	10			10
Capital and financial leases	8			7
Customer Advances	8			7
Other	6			6
Total deferred income tax assets	102			107
Deferred income tax liabilities:
Property related items	(346		)	(349		)
Regulatory assets	(73		)	(74		)
Capital and financial leases	(8		)	(7		)
Other	(6		)	(7		)
Total deferred income tax liabilities	(433		)	(437		)
Net deferred income tax liability	$	(331	)	$	(330	)