Berkshire Hathaway Energy 10-Q 3 Nov 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 31, 2017
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Entity Registrant Name	BERKSHIRE HATHAWAY ENERGY CO
Entity Central Index Key	1,081,316
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		77,174,325
PacifiCorp [Member]
Document Information [Line Items]
Entity Registrant Name	PACIFICORP /OR/
Entity Central Index Key	75,594
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		357,060,915
MidAmerican Funding, LLC and Subsidiaries [Domain]
Document Information [Line Items]
Entity Registrant Name	MIDAMERICAN FUNDING, LLC
Entity Central Index Key	1,098,296
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
MidAmerican Energy Company [Member]
Document Information [Line Items]
Entity Registrant Name	MIDAMERICAN ENERGY COMPANY
Entity Central Index Key	928,576
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		70,980,203
Nevada Power Company [Member]
Document Information [Line Items]
Entity Registrant Name	Nevada Power Company
Entity Central Index Key	71,180
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		1,000
Sierra Pacific Power Company [Member]
Document Information [Line Items]
Entity Registrant Name	Sierra Pacific Power Company
Entity Central Index Key	90,144
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		1,000

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 1,142	$ 721
Trade receivables, net	1,994	1,751
Inventories	887	925
Mortgage loans held for sale	534	359
Other current assets	1,095	917
Total current assets	5,652	4,673
Property, plant and equipment, net	64,979	62,509
Goodwill	9,700	9,010
Regulatory assets	4,582	4,307
Investments and restricted cash and investments	4,987	3,945
Other assets	1,154	996
Total assets	91,054	85,440
Current liabilities:
Accounts payable	1,303	1,317
Accrued interest	523	454
Accrued property, income and other taxes	780	389
Accrued employee expenses	392	261
Short-term debt	2,493	1,869
Current portion of long-term debt	3,070	1,006
Other current liabilities	1,034	1,017
Total current liabilities	9,595	6,313
Regulatory liabilities	3,086	2,933
BHE senior debt	6,771	7,418
BHE junior subordinated debentures	100	944
Subsidiary debt	26,183	26,748
Deferred income taxes	14,832	13,879
Other long-term liabilities	2,883	2,742
Total liabilities	63,450	60,977
Commitments and contingencies
BHE shareholders' equity:
Common stock - 115 shares authorized, no par value, 77 shares issued and outstanding	0	0
Additional paid-in capital	6,362	6,390
Retained earnings	21,534	19,448
Accumulated other comprehensive loss, net	(423)	(1,511)
Total BHE shareholders' equity	27,473	24,327
Noncontrolling interests	131	136
Total equity	27,604	24,463
Total liabilities and equity	$ 91,054	$ 85,440

Consolidated Balance Sheets - P

Consolidated Balance Sheets - PacifiCorp - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 1,142	$ 721
Other current assets	1,095	917
Total current assets	5,652	4,673
Regulatory assets	4,582	4,307
Other assets	1,154	996
Total assets	91,054	85,440
Current liabilities:
Accounts payable	1,303	1,317
Accrued employee expenses	392	261
Accrued interest	523	454
Accrued property, income and other taxes	780	389
Short-term debt	2,493	1,869
Other current liabilities	1,034	1,017
Total current liabilities	9,595	6,313
Regulatory liabilities	3,086	2,933
Deferred income taxes	14,832	13,879
Other long-term liabilities	2,883	2,742
Total liabilities	63,450	60,977
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	6,362	6,390
Retained earnings	21,534	19,448
Accumulated other comprehensive loss, net	(423)	(1,511)
Total BHE shareholders' equity	27,473	24,327
Total liabilities and equity	91,054	85,440
PacifiCorp [Member]
Current assets:
Cash and cash equivalents	104	17
Receivables, Net, Current	722	728
Income taxes receivable	0	17
Other Inventory, Supplies, Gross	237	228
Energy Related Inventory, Other Fossil Fuel	207	215
Regulatory Assets, Current	30	53
Other current assets	72	96
Total current assets	1,372	1,354
Public Utilities, Property, Plant and Equipment, Net	19,135	19,162
Regulatory assets	1,518	1,490
Other assets	388	388
Total assets	22,413	22,394
Current liabilities:
Accounts payable	398	408
Accrued Income Taxes, Current	64	0
Accrued employee expenses	115	67
Accrued interest	106	115
Accrued property, income and other taxes	136	63
Short-term debt	0	270
Long-term Debt and Capital Lease Obligations, Current	591	58
Regulatory Liability, Current	67	54
Other current liabilities	164	164
Total current liabilities	1,641	1,199
Regulatory liabilities	1,032	978
Long-term Debt and Capital Lease Obligations	6,436	7,021
Deferred income taxes	4,884	4,880
Other long-term liabilities	913	926
Total liabilities	14,906	15,004
Equity:
Preferred Stock, Value, Issued	2	2
Common stock	0	0
Additional paid-in capital	4,479	4,479
Retained earnings	3,038	2,921
Accumulated other comprehensive loss, net	(12)	(12)
Total BHE shareholders' equity	7,507	7,390
Total liabilities and equity	$ 22,413	$ 22,394

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - PacifiCorp - $ / shares shares in Millions	Sep. 30, 2017	Dec. 31, 2016
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	115	115
Common stock, shares issued	77	77
Common stock, shares outstanding	77	77
PacifiCorp [Member]
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	750	750
Common stock, shares issued	357	357
Common stock, shares outstanding	357	357

Balance Sheets - MEC

Balance Sheets - MEC - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 1,142	$ 721
Inventories	887	925
Other current assets	1,095	917
Total current assets	5,652	4,673
Regulatory assets	4,582	4,307
Investments and restricted cash and investments	4,987	3,945
Other assets	1,154	996
Total assets	91,054	85,440
Current liabilities:
Accounts Payable, Current	1,303	1,317
Accrued interest	523	454
Accrued property, income and other taxes	780	389
Short-term debt	2,493	1,869
Other current liabilities	1,034	1,017
Total current liabilities	9,595	6,313
Deferred income taxes	14,832	13,879
Regulatory liabilities	3,086	2,933
Other long-term liabilities	2,883	2,742
Total liabilities	63,450	60,977
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	6,362	6,390
Retained earnings	21,534	19,448
Accumulated other comprehensive loss, net	(423)	(1,511)
Total BHE shareholders' equity	27,473	24,327
Total liabilities and equity	91,054	85,440
MidAmerican Energy Company [Member]
Current assets:
Cash and cash equivalents	512	14
Receivables, Net, Current	312	285
Income taxes receivable	0	9
Inventories	235	264
Other current assets	21	35
Total current assets	1,080	607
Public Utilities, Property, Plant and Equipment, Net	13,587	12,821
Regulatory assets	1,335	1,161
Investments and restricted cash and investments	707	653
Other assets	193	217
Total assets	16,902	15,459
Current liabilities:
Accounts Payable, Current	256	303
Accrued interest	52	45
Accrued property, income and other taxes	228	137
Short-term debt	0	99
Long-term Debt and Capital Lease Obligations, Current	350	250
Other current liabilities	158	159
Total current liabilities	1,044	993
Long-term Debt and Capital Lease Obligations	4,544	4,051
Deferred income taxes	3,781	3,572
Regulatory liabilities	927	883
Asset retirement obligations	515	510
Other long-term liabilities	307	290
Total liabilities	11,118	10,299
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	561	561
Retained earnings	5,223	4,599
Total BHE shareholders' equity	5,784	5,160
Total liabilities and equity	$ 16,902	$ 15,459

Consolidated Balance Sheets Bal

Consolidated Balance Sheets Balance Sheets (Parenthetical) - MEC - $ / shares shares in Millions	Sep. 30, 2017	Dec. 31, 2016
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	115	115
Common stock, shares issued	77	77
Common stock, shares outstanding	77	77
MidAmerican Energy Company [Member]
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	350	350
Common stock, shares issued	71	71
Common stock, shares outstanding	71	71

Consolidated Balance Sheets - M

Consolidated Balance Sheets - MidAmerican Funding - USD ($) $ in Millions		Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents		$ 1,142	$ 721
Inventories		887	925
Other current assets		1,095	917
Total current assets		5,652	4,673
Property, plant and equipment, net		64,979	62,509
Goodwill		9,700	9,010
Regulatory assets		4,582	4,307
Investments and restricted cash and investments		4,987	3,945
Other assets		1,154	996
Total assets		91,054	85,440
Current liabilities:
Accounts payable		1,303	1,317
Accrued interest		523	454
Accrued property, income and other taxes		780	389
Short-term debt		2,493	1,869
Other current liabilities		1,034	1,017
Total current liabilities		9,595	6,313
Deferred income taxes		14,832	13,879
Regulatory liabilities		3,086	2,933
Other long-term liabilities		2,883	2,742
Total liabilities		63,450	60,977
Commitments and contingencies
Equity:
Additional paid-in capital		6,362	6,390
Retained earnings		21,534	19,448
Accumulated other comprehensive loss, net		(423)	(1,511)
Total member's equity		27,473	24,327
Total liabilities and equity		91,054	85,440
MidAmerican Funding, LLC and Subsidiaries [Domain]
Current assets:
Cash and cash equivalents		512	15
Receivables, Net, Current		318	287
Income taxes receivable		0	9
Inventories		235	264
Other current assets		21	35
Total current assets		1,086	610
Property, plant and equipment, net		13,602	12,835
Goodwill		1,270	1,270
Regulatory assets		1,335	1,161
Investments and restricted cash and investments		709	655
Other assets		194	216
Total assets	[1]	18,196	16,747
Current liabilities:
Accounts payable		256	302
Accrued interest		54	52
Accrued property, income and other taxes		227	138
Notes Payable, Related Parties, Current		52	31
Short-term debt		0	99
Long-term Debt and Capital Lease Obligations, Current		350	250
Other current liabilities		159	160
Total current liabilities		1,098	1,032
Long-term Debt and Capital Lease Obligations		4,870	4,377
Deferred income taxes		3,777	3,568
Regulatory liabilities		927	883
Asset retirement obligations		515	510
Other long-term liabilities		307	291
Total liabilities		11,494	10,661
Commitments and contingencies
Equity:
Additional paid-in capital		1,679	1,679
Retained earnings		5,023	4,407
Total member's equity		6,702	6,086
Total liabilities and equity		$ 18,196	$ 16,747
[1]	(1)Consists principally of cash and cash equivalents not included in either the regulated electric or regulated natural gas segments.

Consolidated Balance Sheets - N

Consolidated Balance Sheets - NPC - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 1,142	$ 721
Trade receivables, net	1,994	1,751
Inventories	887	925
Other current assets	1,095	917
Total current assets	5,652	4,673
Regulatory assets	4,582	4,307
Other assets	1,154	996
Total assets	91,054	85,440
Current liabilities:
Accounts payable	1,303	1,317
Accrued interest	523	454
Accrued property, income and other taxes	780	389
Other current liabilities	1,034	1,017
Total current liabilities	9,595	6,313
Regulatory liabilities	3,086	2,933
Deferred income taxes	14,832	13,879
Other long-term liabilities	2,883	2,742
Total liabilities	63,450	60,977
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	6,362	6,390
Retained earnings	21,534	19,448
Accumulated other comprehensive loss, net	(423)	(1,511)
Total BHE shareholders' equity	27,473	24,327
Total liabilities and equity	91,054	85,440
Nevada Power Company [Member]
Current assets:
Cash and cash equivalents	69	279
Trade receivables, net	362	243
Inventories	59	73
Regulatory Assets, Current	34	20
Other current assets	50	38
Total current assets	574	653
Public Utilities, Property, Plant and Equipment, Net	6,890	6,997
Regulatory assets	1,110	1,000
Other assets	39	39
Total assets	8,613	8,689
Current liabilities:
Accounts payable	192	187
Accrued interest	39	50
Accrued property, income and other taxes	109	93
Regulatory Liability, Current	35	37
Long-term Debt and Financial and Capital Lease Obligations, Current	842	17
Customer Deposits, Current	78	78
Other current liabilities	31	39
Total current liabilities	1,326	501
Long-term Debt and Financial and Capital Lease Obligations	2,231	3,049
Regulatory liabilities	423	416
Deferred income taxes	1,529	1,474
Other long-term liabilities	281	277
Total liabilities	5,790	5,717
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	2,308	2,308
Retained earnings	518	667
Accumulated other comprehensive loss, net	(3)	(3)
Total BHE shareholders' equity	2,823	2,972
Total liabilities and equity	$ 8,613	$ 8,689

Consolidated Balance Sheets (P9

Consolidated Balance Sheets (Parenthetical) - NPC - $ / shares	Sep. 30, 2017	Dec. 31, 2016
Common stock, shares authorized	115,000,000	115,000,000
Common stock, shares issued	77,000,000	77,000,000
Common stock, shares outstanding	77,000,000	77,000,000
Nevada Power Company [Member]
Common Stock, Par or Stated Value Per Share	$ 1	$ 1
Common stock, shares authorized	1,000	1,000
Common stock, shares issued	1,000	1,000
Common stock, shares outstanding	1,000	1,000

Consolidated Balance Sheets - S

Consolidated Balance Sheets - SPPC - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 1,142	$ 721
Trade receivables, net	1,994	1,751
Inventories	887	925
Other current assets	1,095	917
Total current assets	5,652	4,673
Regulatory assets	4,582	4,307
Other assets	1,154	996
Total assets	91,054	85,440
Current liabilities:
Accounts payable	1,303	1,317
Accrued interest	523	454
Accrued property, income and other taxes	780	389
Other current liabilities	1,034	1,017
Total current liabilities	9,595	6,313
Regulatory liabilities	3,086	2,933
Deferred income taxes	14,832	13,879
Other long-term liabilities	2,883	2,742
Total liabilities	63,450	60,977
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	6,362	6,390
Retained earnings	21,534	19,448
Accumulated Other Comprehensive Income (Loss), Net of Tax	(423)	(1,511)
Total BHE shareholders' equity	27,473	24,327
Total liabilities and equity	91,054	85,440
Sierra Pacific Power Company [Member]
Current assets:
Cash and cash equivalents	30	55
Trade receivables, net	102	117
Inventories	47	45
Regulatory Assets, Current	38	25
Other current assets	20	13
Total current assets	237	255
Public Utilities, Property, Plant and Equipment, Net	2,862	2,822
Regulatory assets	400	410
Other assets	8	6
Total assets	3,507	3,493
Current liabilities:
Accounts payable	75	146
Accrued interest	11	14
Accrued property, income and other taxes	11	10
Regulatory Liability, Current	17	69
Long-term Debt and Financial and Capital Lease Obligations, Current	1	1
Customer Deposits, Current	15	16
Other current liabilities	18	12
Total current liabilities	148	268
Long-term Debt and Financial and Capital Lease Obligations	1,151	1,152
Regulatory liabilities	223	221
Deferred income taxes	663	617
Other long-term liabilities	134	127
Total liabilities	2,319	2,385
Commitments and contingencies
Equity:
Common stock	0	0
Additional paid-in capital	1,111	1,111
Retained earnings	78	(2)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1)	(1)
Total BHE shareholders' equity	1,188	1,108
Total liabilities and equity	$ 3,507	$ 3,493

Consolidated Balance Sheets (11

Consolidated Balance Sheets (Parenthetical) - SPPC - $ / shares	Sep. 30, 2017	Dec. 31, 2016
Common stock, shares authorized	115,000,000	115,000,000
Common stock, shares issued	77,000,000	77,000,000
Common stock, shares outstanding	77,000,000	77,000,000
Sierra Pacific Power Company [Member]
Common Stock, Par or Stated Value Per Share	$ 3.75	$ 3.75
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	1,000	1,000
Common stock, shares outstanding	1,000	1,000

Consolidated Balance Sheets (12

Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Millions	Sep. 30, 2017	Dec. 31, 2016
BHE shareholders' equity:
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	115	115
Common stock, shares issued	77	77
Common stock, shares outstanding	77	77

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating revenue:
Energy	$ 4,322	$ 4,272	$ 11,501	$ 11,102
Real estate	961	820	2,502	2,152
Total operating revenue	5,283	5,092	14,003	13,254
Energy:
Cost of sales	1,212	1,187	3,380	3,252
Operating expense	930	948	2,763	2,739
Depreciation and amortization	635	639	1,905	1,898
Real estate	882	733	2,311	1,973
Total operating costs and expenses	3,659	3,507	10,359	9,862
Operating income	1,624	1,585	3,644	3,392
Other income (expense):
Interest expense	(464)	(460)	(1,379)	(1,401)
Interest Costs Capitalized Adjustment	14	14	34	128
Allowance for equity funds	24	17	59	147
Interest and dividend income	32	39	85	93
Other, net	2	15	24	26
Total other income (expense)	(392)	(375)	(1,177)	(1,007)
Income before income tax expense and equity income	1,232	1,210	2,467	2,385
Income tax expense	184	199	319	394
Equity income	30	36	80	96
Net income	1,078	1,047	2,228	2,087
Net income attributable to noncontrolling interests	10	11	30	25
Net income attributable to BHE shareholders	$ 1,068	$ 1,036	$ 2,198	$ 2,062

Consolidated Statements of Op14

Consolidated Statements of Operations - PacifiCorp - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating costs and expenses:
Operating income	$ 1,624	$ 1,585	$ 3,644	$ 3,392
Other income (expense):
Interest expense	(464)	(460)	(1,379)	(1,401)
Allowance for equity funds	24	17	59	147
Other, net	2	15	24	26
Total other income (expense)	(392)	(375)	(1,177)	(1,007)
Income before income tax expense and equity income	1,232	1,210	2,467	2,385
Income tax expense	184	199	319	394
Net income attributable to BHE shareholders	1,068	1,036	2,198	2,062
PacifiCorp [Member]
Electric Domestic Regulated Revenue	1,430	1,434	3,956	3,919
Operating costs and expenses:
Cost of Domestic Regulated Electric	465	478	1,305	1,295
Utilities Operating Expense, Maintenance and Operations	248	272	754	800
Utilities Operating Expense, Depreciation and Amortization	200	193	598	576
Utilities Operating Expense, Taxes	50	47	149	141
Utilities Operating Expense	963	990	2,806	2,812
Operating income	467	444	1,150	1,107
Other income (expense):
Interest expense	(95)	(95)	(285)	(285)
Interest Costs Capitalized Adjustment	4	4	12	12
Allowance for equity funds	7	7	21	21
Other, net	6	3	13	9
Total other income (expense)	(78)	(81)	(239)	(243)
Income before income tax expense and equity income	389	363	911	864
Income tax expense	126	110	294	270
Net income attributable to BHE shareholders	$ 263	$ 253	$ 617	$ 594

Statements of Operations - MEC

Statements of Operations - MEC - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating revenue:
Total operating revenue	$ 5,283	$ 5,092	$ 14,003	$ 13,254
Operating costs and expenses:
Total operating costs and expenses	3,659	3,507	10,359	9,862
Operating income	1,624	1,585	3,644	3,392
Other income (expense):
Interest expense	(464)	(460)	(1,379)	(1,401)
Allowance for borrowed funds	14	14	34	128
Allowance for equity funds	24	17	59	147
Other, net	2	15	24	26
Total other income (expense)	(392)	(375)	(1,177)	(1,007)
Income before income tax expense and equity income	1,232	1,210	2,467	2,385
Income tax expense	184	199	319	394
Net Income (Loss) Attributable to Parent	1,068	1,036	2,198	2,062
MidAmerican Energy Company [Member]
Operating revenue:
Electric Domestic Regulated Revenue	707	692	1,677	1,572
Gas Domestic Regulated Revenue And Other Revenue	106	103	489	432
Total operating revenue	813	795	2,166	2,004
Operating costs and expenses:
Cost of Domestic Regulated Electric	130	130	342	312
Cost of gas sold and other	54	55	288	237
Utilities Operating Expense, Maintenance and Operations	200	180	547	510
Utilities Operating Expense, Depreciation and Amortization	111	118	369	338
Utilities Operating Expense, Taxes	30	28	90	84
Total operating costs and expenses	525	511	1,636	1,481
Operating income	288	284	530	523
Other income (expense):
Interest expense	(54)	(50)	(160)	(147)
Allowance for borrowed funds	4	3	9	6
Allowance for equity funds	11	6	25	14
Other, net	5	3	13	8
Total other income (expense)	(34)	(38)	(113)	(119)
Income before income tax expense and equity income	254	246	417	404
Income tax expense	(131)	(74)	(207)	(123)
Net Income (Loss) Attributable to Parent	$ 385	$ 320	$ 624	$ 527

Consolidated Statements of Op16

Consolidated Statements of Operations - MidAmerican Funding - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating revenue:
Total operating revenue	$ 5,283	$ 5,092	$ 14,003	$ 13,254
Operating costs and expenses:
Total operating costs and expenses	3,659	3,507	10,359	9,862
Operating income	1,624	1,585	3,644	3,392
Other income (expense):
Other Interest and Dividend Income	(464)	(460)	(1,379)	(1,401)
Allowance for borrowed funds	14	14	34	128
Allowance for equity funds	24	17	59	147
Other, net	2	15	24	26
Total other income (expense)	(392)	(375)	(1,177)	(1,007)
Income before income tax expense and equity income	1,232	1,210	2,467	2,385
Income tax expense	184	199	319	394
Net Income (Loss) Attributable to Parent	1,068	1,036	2,198	2,062
MidAmerican Funding, LLC and Subsidiaries [Domain]
Operating revenue:
Electric Domestic Regulated Revenue	707	692	1,677	1,572
Gas Domestic Regulated Revenue And Other Revenue	108	105	493	436
Total operating revenue	815	797	2,170	2,008
Operating costs and expenses:
Cost of Domestic Regulated Electric	130	130	342	312
Cost of Natural Gas Purchases And Cost of Other Goods And Services Sold	54	56	289	239
Utilities Operating Expense, Maintenance and Operations	202	181	549	511
Utilities Operating Expense, Depreciation and Amortization	111	118	369	338
Utilities Operating Expense, Taxes	30	28	90	84
Total operating costs and expenses	527	513	1,639	1,484
Operating income	288	284	531	524
Other income (expense):
Other Interest and Dividend Income	(59)	(55)	(177)	(164)
Allowance for borrowed funds	4	3	9	6
Allowance for equity funds	11	6	25	14
Other, net	6	3	14	9
Total other income (expense)	(38)	(43)	(129)	(135)
Income before income tax expense and equity income	250	241	402	389
Income tax expense	(133)	(77)	(214)	(129)
Net Income (Loss) Attributable to Parent	$ 383	$ 318	$ 616	$ 518

Consolidated Statements of Op17

Consolidated Statements of Operations - NPC - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Cost of sales	$ 1,212	$ 1,187	$ 3,380	$ 3,252
Total operating costs and expenses	3,659	3,507	10,359	9,862
Operating income	1,624	1,585	3,644	3,392
Interest expense	464	460	1,379	1,401
Allowance for equity funds	24	17	59	147
Other, net	2	15	24	26
Total other income (expense)	(392)	(375)	(1,177)	(1,007)
Income before income tax expense and equity income	1,232	1,210	2,467	2,385
Income tax expense	184	199	319	394
Net income attributable to BHE shareholders	1,068	1,036	2,198	2,062
Nevada Power Company [Member]
Electric Domestic Regulated Revenue	819	766	1,785	1,690
Cost of sales	318	251	721	618
Utilities Operating Expense, Maintenance and Operations	97	105	278	304
Utilities Operating Expense, Depreciation and Amortization	77	76	231	227
Utilities Operating Expense, Taxes	10	10	29	30
Total operating costs and expenses	502	442	1,259	1,179
Operating income	317	324	526	511
Interest expense	44	45	132	140
Allowance for Funds Used During Construction, Capitalized Interest	1	0	1	2
Allowance for equity funds	0	0	1	3
Other, net	5	7	18	17
Total other income (expense)	(38)	(38)	(112)	(118)
Income before income tax expense and equity income	279	286	414	393
Income tax expense	103	98	151	136
Net income attributable to BHE shareholders	$ 176	$ 188	$ 263	$ 257

Consolidated Statements of Op18

Consolidated Statements of Operations - SPPC - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Total operating revenue	$ 5,283	$ 5,092	$ 14,003	$ 13,254
Cost of sales	1,212	1,187	3,380	3,252
Total operating costs and expenses	3,659	3,507	10,359	9,862
Operating income	1,624	1,585	3,644	3,392
Interest expense	464	460	1,379	1,401
Allowance for equity funds	24	17	59	147
Other, net	2	15	24	26
Total other income (expense)	(392)	(375)	(1,177)	(1,007)
Income before income tax expense and equity income	1,232	1,210	2,467	2,385
Income tax expense	184	199	319	394
Net income attributable to BHE shareholders	1,068	1,036	2,198	2,062
Sierra Pacific Power Company [Member]
Electric Domestic Regulated Revenue	215	207	534	539
Gas Domestic Regulated Revenue	15	15	66	81
Total operating revenue	230	222	600	620
Cost of sales	76	73	193	208
Cost of Purchased Oil and Gas	4	5	26	42
Utilities Operating Expense, Maintenance and Operations	40	40	121	126
Utilities Operating Expense, Depreciation and Amortization	29	30	85	88
Utilities Operating Expense, Taxes	6	5	18	18
Total operating costs and expenses	155	153	443	482
Operating income	75	69	157	138
Interest expense	11	12	33	42
Allowance for Funds Used During Construction, Capitalized Interest	1	0	1	1
Allowance for equity funds	1	1	2	2
Other, net	2	2	4	3
Total other income (expense)	(7)	(9)	(26)	(36)
Income before income tax expense and equity income	68	60	131	102
Income tax expense	24	22	46	37
Net income attributable to BHE shareholders	$ 44	$ 38	$ 85	$ 65

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 1,078	$ 1,047	$ 2,228	$ 2,087
Other comprehensive income, net of tax:
Unrecognized amounts on retirement benefits, net of tax	(15)	(18)	(16)	(80)
Foreign currency translation adjustment	227	(134)	535	(339)
Unrealized gains (losses) on available-for-sale securities, net of tax	423	80	542	151
Unrealized losses on cash flow hedges, net of tax	1	(3)	(5)	(2)
Total other comprehensive (loss) income, net of tax	666	(39)	1,088	(110)
Comprehensive income	1,744	1,008	3,316	1,977
Comprehensive income attributable to noncontrolling interests	10	11	30	25
Comprehensive income attributable to BHE shareholders	$ 1,734	$ 997	$ 3,286	$ 1,952

Statements of Comprehensive Inc

Statements of Comprehensive Income - MEC - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net Income (Loss) Attributable to Parent	$ 1,068	$ 1,036	$ 2,198	$ 2,062
Other comprehensive income (loss), unrealized gains on available-for-sale securities	423	80	542	151
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges	1	(3)	(5)	(2)
Other comprehensive income (loss)	666	(39)	1,088	(110)
Comprehensive income attributable to BHE shareholders	1,734	997	3,286	1,952
MidAmerican Energy Company [Member]
Net Income (Loss) Attributable to Parent	$ 385	$ 320	$ 624	527
Other comprehensive income (loss)				$ 2

Statements of Comprehensive I21

Statements of Comprehensive Income (Parenthetical) - MEC - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Unrealized (losses) gains on available-for-sale securities, tax	$ 284	$ 53	$ 355	$ 89
Unrealized (losses) gains on cash flow hedges, tax	$ 1	$ (3)	$ (3)	$ (1)

Consolidated Statements of Co22

Consolidated Statements of Comprehensive Income - MidAmerican Funding - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net Income (Loss) Attributable to Parent	$ 1,068	$ 1,036	$ 2,198	$ 2,062
Other comprehensive income (loss), unrealized gains on available-for-sale securities	423	80	542	151
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges	1	(3)	(5)	(2)
Other comprehensive income (loss)	666	(39)	1,088	(110)
Comprehensive income attributable to BHE shareholders	1,734	997	3,286	1,952
MidAmerican Funding, LLC and Subsidiaries [Domain]
Net Income (Loss) Attributable to Parent	$ 383	$ 318	$ 616	518
Other comprehensive income (loss)				$ 2

Consolidated Statements of Co23

Consolidated Statements of Comprehensive Income (Parenthetical) - MidAmerican Funding - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Unrealized (losses) gains on available-for-sale securities, tax	$ 284	$ 53	$ 355	$ 89
Unrealized (losses) gains on cash flow hedges, tax	$ 1	$ (3)	$ (3)	$ (1)

Consolidated Statements of Co24

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Consolidated Statements of Comprehensive Income Parenthetical [Abstract]
Unrecognized amounts on retirement benefits, tax	$ 1	$ 7	$ (3)	$ 26
Unrealized (losses) gains on available-for-sale securities, tax	284	53	355	89
Unrealized (losses) gains on cash flow hedges, tax	$ 1	$ (3)	$ (3)	$ (1)

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income, Net [Member]	Noncontrolling Interest [Member]
Balance (shares) at Dec. 31, 2015		77
Balance at Dec. 31, 2015	$ 22,535	$ 0	$ 6,403	$ 16,906	$ (908)	$ 134
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	2,076	0	0	2,062	0	14
Other comprehensive income (loss)	(110)	0	0	0	(110)	0
Distributions	(14)	0	0	0	0	(14)
Other equity transactions	9	$ 0	1	0	0	8
Balance (shares) at Sep. 30, 2016		77
Balance at Sep. 30, 2016	$ 24,496	$ 0	6,404	18,968	(1,018)	142
Balance (shares) at Dec. 31, 2016	77	77
Balance at Dec. 31, 2016	$ 24,463	$ 0	6,390	19,448	(1,511)	136
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	2,212	0	0	2,198	0	14
Other comprehensive income (loss)	1,088	0	0	0	1,088	0
Distributions	(16)	0	0	0	0	(16)
Common stock purchases	(19)	0	(1)	(18)	0	0
Conversion of Stock, Amount Converted	(100)	0	(6)	(94)	0	0
Other equity transactions	$ (24)	$ 0	(21)	0	0	(3)
Balance (shares) at Sep. 30, 2017	77	77
Balance at Sep. 30, 2017	$ 27,604	$ 0	$ 6,362	$ 21,534	$ (423)	$ 131

Consolidated Statements of Ch26

Consolidated Statements of Changes in Equity - PacifiCorp - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income, Net [Member]	PacifiCorp [Member]	PacifiCorp [Member]Preferred Stock [Member]	PacifiCorp [Member]Common Stock [Member]	PacifiCorp [Member]Additional Paid-in Capital [Member]	PacifiCorp [Member]Retained Earnings [Member]	PacifiCorp [Member]Accumulated Other Comprehensive (Loss) Income, Net [Member]
Stockholders' Equity Attributable to Parent at Dec. 31, 2015						$ 7,503	$ 2	$ 0	$ 4,479	$ 3,033	$ (11)
Net Income (Loss) Attributable to Parent	$ 2,062					594				594
Total other comprehensive (loss) income, net of tax	(110)	$ 0	$ 0	$ 0	$ (110)
Dividends, Common Stock, Cash						(550)				(550)
Stockholders' Equity Attributable to Parent at Sep. 30, 2016						7,547	2	0	4,479	3,077	(11)
Stockholders' Equity Attributable to Parent at Dec. 31, 2016	24,327					7,390	2	0	4,479	2,921	(12)
Net Income (Loss) Attributable to Parent	2,198					617				617
Total other comprehensive (loss) income, net of tax	1,088	$ 0	$ 0	$ 0	$ 1,088
Dividends, Common Stock, Cash						(500)				(500)
Stockholders' Equity Attributable to Parent at Sep. 30, 2017	$ 27,473					$ 7,507	$ 2	$ 0	$ 4,479	$ 3,038	$ (12)

Statements of Changes in Equity

Statements of Changes in Equity - MEC - USD ($) $ in Millions	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income, Net [Member]	MidAmerican Energy Company [Member]	MidAmerican Energy Company [Member]Common Stock [Member]	MidAmerican Energy Company [Member]Retained Earnings [Member]	MidAmerican Energy Company [Member]Accumulated Other Comprehensive (Loss) Income, Net [Member]
Stockholders' Equity Attributable to Parent at Dec. 31, 2015					$ 4,705	$ 561	$ 4,174	$ (30)
Net Income (Loss) Attributable to Parent	$ 2,062				527		527
Other comprehensive income (loss)	(110)	$ 0	$ 0	$ (110)	2			2
Dividend, noncash, transfer of operations					90		117	27
Stockholders' Equity, Other	9	0	0	0	(1)		(1)
Stockholders' Equity Attributable to Parent at Sep. 30, 2016					5,143	561	4,583	(1)
Stockholders' Equity Attributable to Parent at Dec. 31, 2016	24,327				5,160	561	4,599	0
Net Income (Loss) Attributable to Parent	2,198				624		624
Other comprehensive income (loss)	1,088	0	0	1,088
Stockholders' Equity, Other	(24)	$ 0	$ 0	$ 0
Stockholders' Equity Attributable to Parent at Sep. 30, 2017	$ 27,473				$ 5,784	$ 561	$ 5,223	$ 0

Consolidated Statements of Ch28

Consolidated Statements of Changes in Equity - MidAmerican Funding - USD ($) $ in Millions	Total	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income, Net [Member]	MidAmerican Funding, LLC and Subsidiaries [Domain]	MidAmerican Funding, LLC and Subsidiaries [Domain]Additional Paid-in Capital [Member]	MidAmerican Funding, LLC and Subsidiaries [Domain]Retained Earnings [Member]	MidAmerican Funding, LLC and Subsidiaries [Domain]Accumulated Other Comprehensive (Loss) Income, Net [Member]
Stockholders' Equity Attributable to Parent at Dec. 31, 2015					$ 5,525	$ 1,679	$ 3,876	$ (30)
Net Income (Loss) Attributable to Parent	$ 2,062				518		518
Other comprehensive income (loss)	(110)	$ 0	$ 0	$ (110)	2			2
Stockholders' Equity Note, Spinoff Transaction					27			27
Stockholders' Equity Attributable to Parent at Sep. 30, 2016					6,071	1,679	4,393	(1)
Stockholders' Equity, Other	9	1	0	0	(1)		(1)
Stockholders' Equity Attributable to Parent at Dec. 31, 2016	24,327				6,086	1,679	4,407	0
Net Income (Loss) Attributable to Parent	2,198				616		616
Other comprehensive income (loss)	1,088	0	0	1,088
Stockholders' Equity Attributable to Parent at Sep. 30, 2017	27,473				$ 6,702	$ 1,679	$ 5,023	$ 0
Stockholders' Equity, Other	$ (24)	$ (21)	$ 0	$ 0

Consolidated Statements of Ch29

Consolidated Statements of Changes in Equity - NPC - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income, Net [Member]	Nevada Power Company [Member]	Nevada Power Company [Member]Common Stock [Member]	Nevada Power Company [Member]Additional Paid-in Capital [Member]	Nevada Power Company [Member]Retained Earnings [Member]	Nevada Power Company [Member]Accumulated Other Comprehensive (Loss) Income, Net [Member]
Balance (shares) at Dec. 31, 2015		77,000,000					1,000
Stockholders' Equity Attributable to Parent at Dec. 31, 2015						$ 3,163	$ 0	$ 2,308	$ 858	$ (3)
Net Income (Loss) Attributable to Parent	$ 2,062					257			257
Dividends, Common Stock, Cash						365			365
Stockholders' Equity, Other	$ (9)	$ 0	$ (1)	$ 0	$ 0	1			1
Balance (shares) at Sep. 30, 2016		77,000,000					1,000
Stockholders' Equity Attributable to Parent at Sep. 30, 2016						$ 3,054	$ 0	2,308	749	(3)
Balance (shares) at Dec. 31, 2016	77,000,000	77,000,000				1,000	1,000
Stockholders' Equity Attributable to Parent at Dec. 31, 2016	$ 24,327					$ 2,972	$ 0	2,308	667	(3)
Net Income (Loss) Attributable to Parent	2,198					263			263
Dividends, Common Stock, Cash						$ 412			412
Stockholders' Equity, Other	$ 24	$ 0	$ 21	$ 0	$ 0
Balance (shares) at Sep. 30, 2017	77,000,000	77,000,000				1,000	1,000
Stockholders' Equity Attributable to Parent at Sep. 30, 2017	$ 27,473					$ 2,823	$ 0	$ 2,308	$ 518	$ (3)

Consolidated Statements of Ch30

Consolidated Statements of Changes in Equity - SPPC - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income, Net [Member]	Sierra Pacific Power Company [Member]	Sierra Pacific Power Company [Member]Common Stock [Member]	Sierra Pacific Power Company [Member]Additional Paid-in Capital [Member]	Sierra Pacific Power Company [Member]Retained Earnings [Member]	Sierra Pacific Power Company [Member]Accumulated Other Comprehensive (Loss) Income, Net [Member]
Balance (shares) at Dec. 31, 2015		77,000,000					1,000
Stockholders' Equity Attributable to Parent at Dec. 31, 2015						$ 1,076	$ 0	$ 1,111	$ (35)	$ 0
Net Income (Loss) Attributable to Parent	$ 2,062					65			65
Dividends, Common Stock, Cash						45	0		45	0
Stockholders' Equity, Other	$ (9)	$ 0	$ (1)	$ 0	$ 0	(1)	$ 0	0		1
Balance (shares) at Sep. 30, 2016		77,000,000					1,000
Stockholders' Equity Attributable to Parent at Sep. 30, 2016						$ 1,095	$ 0	1,111	(15)	(1)
Balance (shares) at Dec. 31, 2016	77,000,000	77,000,000				1,000	1,000
Stockholders' Equity Attributable to Parent at Dec. 31, 2016	$ 24,327					$ 1,108	$ 0	1,111	(2)	(1)
Net Income (Loss) Attributable to Parent	2,198					85			85
Dividends, Common Stock, Cash						$ 5			5
Stockholders' Equity, Other	$ 24	$ 0	$ 21	$ 0	$ 0
Balance (shares) at Sep. 30, 2017	77,000,000	77,000,000				1,000	1,000
Stockholders' Equity Attributable to Parent at Sep. 30, 2017	$ 27,473					$ 1,188	$ 0	$ 1,111	$ 78	$ (1)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net income	$ 2,228	$ 2,087
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	1,943	1,922
Allowance for equity funds	(59)	(147)
Equity income, net of distributions	(14)	(62)
Increase (Decrease) in Regulatory Assets and Liabilities	17	41
Deferred income taxes and amortization of investment tax credits	573	546
Other, net	13	(60)
Changes in other operating assets and liabilities, net of effects from acquisitions:
Increase (Decrease) in Accounts Receivable and Other Operating Assets	(98)	(348)
Derivative collateral, net	(16)	22
Pension and other postretirement benefit plans	(29)	(73)
Accrued property, income and other taxes	390	713
Accounts payable and other liabilities	170	183
Net cash flows from operating activities	5,118	4,824
Cash flows from investing activities:
Capital expenditures	(3,179)	(3,521)
Acquisitions, net of cash acquired	(1,102)	(66)
Increase in restricted cash and investments	(45)	(48)
Purchases of available-for-sale securities	(167)	(98)
Proceeds from sales of available-for-sale securities	186	125
Equity method investments	(54)	(462)
Other, net	(12)	(47)
Net cash flows from investing activities	(4,373)	(4,117)
Cash flows from financing activities:
Repayments of Long-term Debt	(1,344)	(1,500)
Common stock purchases	(19)	0
Proceeds from subsidiary debt	1,562	1,484
Repayments of subsidiary debt	(834)	(1,613)
Net proceeds from short-term debt	365	887
Other, net	(60)	(50)
Net cash flows from financing activities	(330)	(792)
Effect of exchange rate changes	6	(5)
Net change in cash and cash equivalents	421	(90)
Cash and cash equivalents at beginning of period	721	1,108
Cash and cash equivalents at end of period	$ 1,142	$ 1,018

Consolidated Statements of Ca32

Consolidated Statements of Cash Flows - PacifiCorp - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Net Income (Loss) Attributable to Parent	$ 2,198	$ 2,062
Increase (Decrease) in Allowance for Equity Funds Used During Construction	(59)	(147)
Deferred income taxes and amortization of investment tax credits	573	546
Increase (Decrease) in Regulatory Assets and Liabilities	17	41
Other Noncash Income (Expense)	13	(60)
Increase (Decrease) in Accounts Receivable and Other Operating Assets	(98)	(348)
Derivative collateral, net	(16)	22
Accounts payable and other liabilities	170	183
Net cash flows from operating activities	5,118	4,824
Capital expenditures	(3,179)	(3,521)
Other, net	(12)	(47)
Net cash flows from investing activities	(4,373)	(4,117)
Proceeds from Issuance of Long-term Debt	91	0
Net proceeds from (repayments of) short-term debt	(365)	(887)
Other, net	(60)	(50)
Net cash flows from financing activities	(330)	(792)
Net change in cash and cash equivalents	421	(90)
Cash and cash equivalents at beginning of period	721	1,108
Cash and cash equivalents at end of period	1,142	1,018
PacifiCorp [Member]
Net Income (Loss) Attributable to Parent	617	594
Utilities Operating Expense, Depreciation and Amortization	598	576
Increase (Decrease) in Allowance for Equity Funds Used During Construction	(21)	(21)
Deferred income taxes and amortization of investment tax credits	14	76
Increase (Decrease) in Regulatory Assets and Liabilities	21	85
Other Noncash Income (Expense)	1	6
Increase (Decrease) in Accounts Receivable and Other Operating Assets	25	19
Derivative collateral, net	(4)	2
Increase (Decrease) in Inventories	(1)	(32)
Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable	75	133
Accounts payable and other liabilities	110	(66)
Net cash flows from operating activities	1,435	1,372
Capital expenditures	(553)	(586)
Other, net	32	26
Net cash flows from investing activities	(521)	(560)
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities	(54)	(56)
Net proceeds from (repayments of) short-term debt	(270)	(20)
Payments of Ordinary Dividends, Common Stock	(500)	(550)
Other, net	(3)	0
Net cash flows from financing activities	(827)	(626)
Net change in cash and cash equivalents	87	186
Cash and cash equivalents at beginning of period	17	12
Cash and cash equivalents at end of period	$ 104	$ 198

Statements of Cash Flows - MEC

Statements of Cash Flows - MEC - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Net Income (Loss) Attributable to Parent	$ 2,198	$ 2,062
Deferred income taxes and amortization of investment tax credits	573	546
Other Noncash Income (Expense)	13	(60)
Derivative collateral, net	(16)	22
Pension and other postretirement benefit plans	(29)	(73)
Accrued property, income and other taxes	390	713
Net cash flows from operating activities	5,118	4,824
Capital expenditures	(3,179)	(3,521)
Purchases of available-for-sale securities	(167)	(98)
Proceeds from sales of available-for-sale securities	186	125
Other, net	(12)	(47)
Net cash flows from investing activities	(4,373)	(4,117)
Proceeds from Issuance of Long-term Debt	91	0
Repayments of Long-term Debt	(1,344)	(1,500)
Net proceeds from short-term debt	365	887
Other, net	(60)	(50)
Net cash flows from financing activities	(330)	(792)
Net change in cash and cash equivalents	421	(90)
Cash and cash equivalents at beginning of period	721	1,108
Cash and cash equivalents at end of period	1,142	1,018
MidAmerican Energy Company [Member]
Net Income (Loss) Attributable to Parent	624	527
Utilities Operating Expense, Depreciation and Amortization	369	338
Deferred income taxes and amortization of investment tax credits	64	113
Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net	28	34
Other Noncash Income (Expense)	(23)	(42)
Increase (Decrease) in Accounts and Other Receivables	(28)	(67)
Increase (Decrease) in Inventories	29	(26)
Derivative collateral, net	3	4
Pension and other postretirement benefit plans	(8)	(5)
Increase (Decrease) in Accounts Payable	(5)	14
Accrued property, income and other taxes	98	160
Increase (Decrease) in Other Current Assets and Liabilities, Net	20	30
Net cash flows from operating activities	1,171	1,080
Capital expenditures	(1,162)	(1,129)
Purchases of available-for-sale securities	(126)	(96)
Proceeds from sales of available-for-sale securities	127	92
Other, net	0	5
Net cash flows from investing activities	(1,161)	(1,128)
Proceeds from Issuance of Long-term Debt	842	33
Repayments of Long-term Debt	(255)	(38)
Net proceeds from short-term debt	(99)	0
Net cash flows from financing activities	488	(5)
Net change in cash and cash equivalents	498	(53)
Cash and cash equivalents at beginning of period	14	103
Cash and cash equivalents at end of period	$ 512	$ 50

Consolidated Statements of Ca34

Consolidated Statements of Cash Flows - MidAmerican Funding - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Net Income (Loss) Attributable to Parent	$ 2,198	$ 2,062
Deferred income taxes and amortization of investment tax credits	573	546
Other Noncash Income (Expense)	13	(60)
Derivative collateral, net	(16)	22
Pension and other postretirement benefit plans	(29)	(73)
Accrued property, income and other taxes	390	713
Net cash flows from operating activities	5,118	4,824
Capital expenditures	(3,179)	(3,521)
Purchases of available-for-sale securities	(167)	(98)
Proceeds from sales of available-for-sale securities	186	125
Other, net	(12)	(47)
Net cash flows from investing activities	(4,373)	(4,117)
Proceeds from Issuance of Long-term Debt	91	0
Repayments of Long-term Debt	(1,344)	(1,500)
Net proceeds from short-term debt	365	887
Other, net	(60)	(50)
Net cash flows from financing activities	(330)	(792)
Net change in cash and cash equivalents	421	(90)
Cash and cash equivalents at beginning of period	721	1,108
Cash and cash equivalents at end of period	1,142	1,018
MidAmerican Funding, LLC and Subsidiaries [Domain]
Net Income (Loss) Attributable to Parent	616	518
Utilities Operating Expense, Depreciation and Amortization	369	338
Deferred income taxes and amortization of investment tax credits	64	113
Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net	28	34
Other Noncash Income (Expense)	(24)	(42)
Increase (Decrease) in Accounts and Other Receivables	(31)	(67)
Increase (Decrease) in Inventories	29	(26)
Derivative collateral, net	3	4
Pension and other postretirement benefit plans	(8)	(5)
Increase (Decrease) in Accounts Payable	(4)	14
Accrued property, income and other taxes	96	160
Increase (Decrease) in Other Current Assets and Liabilities, Net	14	24
Net cash flows from operating activities	1,152	1,065
Capital expenditures	(1,162)	(1,129)
Purchases of available-for-sale securities	(126)	(96)
Proceeds from sales of available-for-sale securities	127	92
Other, net	(3)	5
Net cash flows from investing activities	(1,164)	(1,128)
Proceeds from Issuance of Long-term Debt	842	33
Repayments of Long-term Debt	(255)	(38)
Increase (Decrease) in Notes Payable, Related Parties, Current	21	16
Net proceeds from short-term debt	(99)	0
Net cash flows from financing activities	509	11
Net change in cash and cash equivalents	497	(52)
Cash and cash equivalents at beginning of period	15	103
Cash and cash equivalents at end of period	$ 512	$ 51

Consolidated Statements of Ca35

Consolidated Statements of Cash Flows - NPC - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Net Income (Loss) Attributable to Parent	$ 2,198	$ 2,062
Deferred income taxes and amortization of investment tax credits	573	546
Allowance for equity funds	(59)	(147)
Increase (Decrease) in Regulatory Assets and Liabilities	17	41
Other Noncash Income (Expense)	13	(60)
Increase (Decrease) in Accounts Receivable and Other Operating Assets	(98)	(348)
Accrued property, income and other taxes	390	713
Accounts payable and other liabilities	170	183
Net cash flows from operating activities	5,118	4,824
Capital expenditures	(3,179)	(3,521)
Acquisitions, net of cash acquired	(1,102)	(66)
Payments for (Proceeds from) Other Investing Activities	12	47
Net cash flows from investing activities	(4,373)	(4,117)
Proceeds from Issuance of Long-term Debt	91	0
Repayments of Long-term Debt	(1,344)	(1,500)
Net cash flows from financing activities	(330)	(792)
Net change in cash and cash equivalents	421	(90)
Cash and cash equivalents at end of period	1,142	1,018
Cash and cash equivalents at beginning of period	721	1,108
Nevada Power Company [Member]
Net Income (Loss) Attributable to Parent	263	257
Other Nonrecurring (Income) Expense	(1)	0
Utilities Operating Expense, Depreciation and Amortization	231	227
Deferred income taxes and amortization of investment tax credits	61	52
Allowance for equity funds	(1)	(3)
Increase (Decrease) in Regulatory Assets and Liabilities	25	139
Deferred Energy Change	(22)	(3)
Amortization of Deferred Charges	13	(87)
Other Noncash Income (Expense)	(1)	3
Increase (Decrease) in Accounts Receivable and Other Operating Assets	(122)	(96)
Increase (Decrease) in Inventories	6	7
Accrued property, income and other taxes	11	98
Accounts payable and other liabilities	9	7
Net cash flows from operating activities	472	601
Capital expenditures	(202)	(249)
Acquisitions, net of cash acquired	(77)	0
Payments for (Proceeds from) Other Investing Activities	(4)	0
Net cash flows from investing activities	(275)	(249)
Repayments of Long-term Debt	(86)	(221)
Payments of Ordinary Dividends, Common Stock	(412)	(365)
Net cash flows from financing activities	(407)	(586)
Net change in cash and cash equivalents	(210)	(234)
Cash and cash equivalents at end of period	69	302
Cash and cash equivalents at beginning of period	$ 279	$ 536

Consolidated Statements of Ca36

Consolidated Statements of Cash Flows - SPPC - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Net Income (Loss) Attributable to Parent	$ 2,198	$ 2,062
Allowance for equity funds	(59)	(147)
Deferred income taxes and amortization of investment tax credits	573	546
Increase (Decrease) in Regulatory Assets and Liabilities	17	41
Other Noncash Income (Expense)	(13)	60
Increase (Decrease) in Accounts Receivable and Other Operating Assets	(98)	(348)
Accrued property, income and other taxes	390	713
Accounts payable and other liabilities	170	183
Net cash flows from operating activities	5,118	4,824
Capital expenditures	(3,179)	(3,521)
Net cash flows from investing activities	(4,373)	(4,117)
Proceeds from Issuance of Long-term Debt	91	0
Repayments of Long-term Debt	(1,344)	(1,500)
Net cash flows from financing activities	(330)	(792)
Net change in cash and cash equivalents	421	(90)
Cash and cash equivalents at beginning of period	721	1,108
Cash and cash equivalents at end of period	1,142	1,018
Sierra Pacific Power Company [Member]
Net Income (Loss) Attributable to Parent	85	65
Utilities Operating Expense, Depreciation and Amortization	85	88
Allowance for equity funds	(2)	(2)
Deferred income taxes and amortization of investment tax credits	46	37
Increase (Decrease) in Regulatory Assets and Liabilities	9	(14)
Deferred Energy Change	(23)	55
Amortization of Deferred Charges	(43)	(35)
Other Noncash Income (Expense)	0	1
Increase (Decrease) in Accounts Receivable and Other Operating Assets	13	12
Increase (Decrease) in Inventories	(2)	1
Accrued property, income and other taxes	(2)	0
Accounts payable and other liabilities	(54)	(15)
Net cash flows from operating activities	112	191
Capital expenditures	(131)	(137)
Net cash flows from investing activities	(131)	(137)
Proceeds from Issuance of Long-term Debt	0	1,089
Repayments of Long-term Debt	(1)	(1,137)
Payments of Ordinary Dividends, Common Stock	(5)	(45)
Net cash flows from financing activities	(6)	(93)
Net change in cash and cash equivalents	(25)	(39)
Cash and cash equivalents at beginning of period	55	106
Cash and cash equivalents at end of period	$ 30	$ 67

General

General	9 Months Ended
	Sep. 30, 2017
Segment Reporting Information [Line Items]
General/Organization and Operations	General Berkshire Hathaway Energy Company (" BHE ") is a holding company that owns a highly diversified portfolio of locally-managed businesses principally engaged in the energy industry (collectively with its subsidiaries, the "Company") and is a consolidated subsidiary of Berkshire Hathaway Inc. (" Berkshire Hathaway "). The Company is organized as eight business segments: PacifiCorp , MidAmerican Funding, LLC (" MidAmerican Funding ") (which primarily consists of MidAmerican Energy Company (" MidAmerican Energy ")), NV Energy, Inc. (" NV Energy ") (which primarily consists of Nevada Power Company (" Nevada Power ") and Sierra Pacific Power Company (" Sierra Pacific ")), Northern Powergrid Holdings Company (" Northern Powergrid ") (which primarily consists of Northern Powergrid (Northeast) Limited and Northern Powergrid (Yorkshire) plc ), BHE Pipeline Group (which consists of Northern Natural Gas Company (" Northern Natural Gas ") and Kern River Gas Transmission Company (" Kern River ")), BHE Transmission (which consists of BHE Canada Holdings Corporation (" AltaLink ") (which primarily consists of AltaLink, L.P. (" ALP ")) and BHE U.S. Transmission, LLC ), BHE Renewables (which primarily consists of BHE Renewables, LLC and CalEnergy Philippines ) and HomeServices of America, Inc. (collectively with its subsidiaries, " HomeServices "). The Company, through these locally managed and operated businesses, owns four utility companies in the United States serving customers in 11 states, two electricity distribution companies in Great Britain, two interstate natural gas pipeline companies in the United States, an electric transmission business in Canada, interests in electric transmission businesses in the United States, a renewable energy business primarily selling power generated from solar, wind, geothermal and hydroelectric sources under long-term contracts, the second largest residential real estate brokerage firm in the United States and one of the largest residential real estate brokerage franchise networks in the United States. The unaudited Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and the United States Securities and Exchange Commission's rules and regulations for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the disclosures required by GAAP for annual financial statements. Management believes the unaudited Consolidated Financial Statements contain all adjustments (consisting only of normal recurring adjustments) considered necessary for the fair presentation of the unaudited Consolidated Financial Statements as of September 30, 2017 and for the three- and nine-month periods ended September 30, 2017 and 2016 . The results of operations for the three- and nine-month periods ended September 30, 2017 are not necessarily indicative of the results to be expected for the full year. The preparation of the unaudited Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the unaudited Consolidated Financial Statements and the reported amounts of revenue and expenses during the period. Actual results may differ from the estimates used in preparing the unaudited Consolidated Financial Statements. Note 2 of Notes to Consolidated Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2016 describes the most significant accounting policies used in the preparation of the unaudited Consolidated Financial Statements. There have been no significant changes in the Company's assumptions regarding significant accounting estimates and policies during the nine-month period ended September 30, 2017 .
PacifiCorp [Member]
Segment Reporting Information [Line Items]
General/Organization and Operations	General PacifiCorp, which includes PacifiCorp and its subsidiaries, is a United States regulated electric utility company serving retail customers, including residential, commercial, industrial, irrigation and other customers in portions of Utah, Oregon, Wyoming, Washington, Idaho and California. PacifiCorp owns, or has interests in, a number of thermal, hydroelectric, wind-powered and geothermal generating facilities, as well as electric transmission and distribution assets. PacifiCorp also buys and sells electricity on the wholesale market with other utilities, energy marketing companies, financial institutions and other market participants. PacifiCorp is subject to comprehensive state and federal regulation. PacifiCorp's subsidiaries support its electric utility operations by providing coal mining services. PacifiCorp is an indirect subsidiary of Berkshire Hathaway Energy Company (" BHE "), a holding company based in Des Moines, Iowa that owns subsidiaries principally engaged in energy businesses. BHE is a consolidated subsidiary of Berkshire Hathaway Inc. (" Berkshire Hathaway "). The unaudited Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and the United States Securities and Exchange Commission's rules and regulations for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the disclosures required by GAAP for annual financial statements. Management believes the unaudited Consolidated Financial Statements contain all adjustments (consisting only of normal recurring adjustments) considered necessary for the fair presentation of the unaudited Consolidated Financial Statements as of September 30, 2017 and for the three- and nine-month periods ended September 30, 2017 and 2016 . The Consolidated Statements of Comprehensive Income have been omitted as net income equals comprehensive income for the three- and nine-month periods ended September 30, 2017 and 2016 . The results of operations for the three- and nine-month periods ended September 30, 2017 and 2016 are not necessarily indicative of the results to be expected for the full year. The preparation of the unaudited Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the unaudited Consolidated Financial Statements and the reported amounts of revenue and expenses during the period. Actual results may differ from the estimates used in preparing the unaudited Consolidated Financial Statements. Note 2 of Notes to Consolidated Financial Statements included in PacifiCorp's Annual Report on Form 10-K for the year ended December 31, 2016 describes the most significant accounting policies used in the preparation of the unaudited Consolidated Financial Statements. There have been no significant changes in PacifiCorp's assumptions regarding significant accounting estimates and policies during the nine-month period ended September 30, 2017 .
MidAmerican Energy Company [Member]
Segment Reporting Information [Line Items]
General/Organization and Operations	General MidAmerican Energy Company ("MidAmerican Energy") is a public utility with electric and natural gas operations and is the principal subsidiary of MHC Inc. ("MHC"). MHC is a holding company that conducts no business other than the ownership of its subsidiaries and related corporate services. MHC's nonregulated subsidiaries include Midwest Capital Group, Inc. and MEC Construction Services Co. MHC is the direct, wholly owned subsidiary of MidAmerican Funding, LLC ("MidAmerican Funding"), which is an Iowa limited liability company with Berkshire Hathaway Energy Company (" BHE ") as its sole member. BHE is a consolidated subsidiary of Berkshire Hathaway Inc. (" Berkshire Hathaway "). The unaudited Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and the United States Securities and Exchange Commission's rules and regulations for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the disclosures required by GAAP for annual financial statements. Management believes the unaudited Financial Statements contain all adjustments (consisting only of normal recurring adjustments) considered necessary for the fair presentation of the unaudited Financial Statements as of September 30, 2017 , and for the three- and nine-month periods ended September 30, 2017 and 2016 . The results of operations for the three- and nine-month periods ended September 30, 2017 , are not necessarily indicative of the results to be expected for the full year. The preparation of the unaudited Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the unaudited Financial Statements and the reported amounts of revenue and expenses during the period. Actual results may differ from the estimates used in preparing the unaudited Financial Statements. Note 2 of Notes to Financial Statements included in MidAmerican Energy's Annual Report on Form 10-K for the year ended December 31, 2016 , describes the most significant accounting policies used in the preparation of the unaudited Financial Statements. There have been no significant changes in MidAmerican Energy's assumptions regarding significant accounting estimates and policies during the nine-month period ended September 30, 2017 .
MidAmerican Funding, LLC and Subsidiaries [Domain]
Segment Reporting Information [Line Items]
General/Organization and Operations	General MidAmerican Funding, LLC (" MidAmerican Funding ") is an Iowa limited liability company with Berkshire Hathaway Energy Company (" BHE ") as its sole member. BHE is a consolidated subsidiary of Berkshire Hathaway Inc. (" Berkshire Hathaway "). MidAmerican Funding 's direct, wholly owned subsidiary is MHC Inc. ("MHC"), which constitutes substantially all of MidAmerican Funding 's assets, liabilities and business activities except those related to MidAmerican Funding 's long-term debt securities. MHC conducts no business other than the ownership of its subsidiaries and related corporate services. MHC's principal subsidiary is MidAmerican Energy Company ("MidAmerican Energy"), a public utility with electric and natural gas operations. Direct, wholly owned nonregulated subsidiaries of MHC are Midwest Capital Group, Inc. and MEC Construction Services Co. The unaudited Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and the United States Securities and Exchange Commission's rules and regulations for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the disclosures required by GAAP for annual financial statements. Management believes the unaudited Consolidated Financial Statements contain all adjustments (consisting only of normal recurring adjustments) considered necessary for the fair presentation of the unaudited Consolidated Financial Statements as of September 30, 2017 , and for the three- and nine-month periods ended September 30, 2017 and 2016 . The results of operations for the three- and nine-month periods ended September 30, 2017 , are not necessarily indicative of the results to be expected for the full year. The preparation of the unaudited Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the unaudited Consolidated Financial Statements and the reported amounts of revenue and expenses during the period. Actual results may differ from the estimates used in preparing the unaudited Consolidated Financial Statements. Note 2 of Notes to Consolidated Financial Statements included in MidAmerican Funding 's Annual Report on Form 10-K for the year ended December 31, 2016 , describes the most significant accounting policies used in the preparation of the unaudited Consolidated Financial Statements. There have been no significant changes in MidAmerican Funding 's assumptions regarding significant accounting estimates and policies during the nine-month period ended September 30, 2017 .
Nevada Power Company [Member]
Segment Reporting Information [Line Items]
General/Organization and Operations	Organization and Operations Nevada Power Company, together with its subsidiaries ("Nevada Power"), is a wholly owned subsidiary of NV Energy, Inc. ("NV Energy"), a holding company that also owns Sierra Pacific Power Company ("Sierra Pacific") and certain other subsidiaries. Nevada Power is a United States regulated electric utility company serving retail customers, including residential, commercial and industrial customers, primarily in the Las Vegas, North Las Vegas, Henderson and adjoining areas. NV Energy is an indirect wholly owned subsidiary of Berkshire Hathaway Energy Company (" BHE "). BHE is a holding company based in Des Moines, Iowa that owns subsidiaries principally engaged in energy businesses. BHE is a consolidated subsidiary of Berkshire Hathaway Inc. (" Berkshire Hathaway "). The unaudited Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and the United States Securities and Exchange Commission's rules and regulations for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the disclosures required by GAAP for annual financial statements. Management believes the unaudited Consolidated Financial Statements contain all adjustments (consisting only of normal recurring adjustments) considered necessary for the fair presentation of the unaudited Consolidated Financial Statements as of September 30, 2017 and for the three- and nine-month periods ended September 30, 2017 and 2016 . The Consolidated Statements of Comprehensive Income have been omitted as net income equals comprehensive income for the three- and nine-month periods ended September 30, 2017 and 2016 . The results of operations for the three- and nine-month periods ended September 30, 2017 are not necessarily indicative of the results to be expected for the full year. The preparation of the unaudited Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the unaudited Consolidated Financial Statements and the reported amounts of revenue and expenses during the period. Actual results may differ from the estimates used in preparing the unaudited Consolidated Financial Statements. Note 2 of Notes to Consolidated Financial Statements included in Nevada Power's Annual Report on Form 10-K for the year ended December 31, 2016 describes the most significant accounting policies used in the preparation of the unaudited Consolidated Financial Statements. There have been no significant changes in Nevada Power's assumptions regarding significant accounting estimates and policies during the nine-month period ended September 30, 2017 .
Sierra Pacific Power Company [Member]
Segment Reporting Information [Line Items]
General/Organization and Operations	Organization and Operations Sierra Pacific Power Company, together with its subsidiaries ("Sierra Pacific"), is a wholly owned subsidiary of NV Energy, Inc. ("NV Energy"), a holding company that also owns Nevada Power Company ("Nevada Power") and certain other subsidiaries. Sierra Pacific is a United States regulated electric utility company serving retail customers, including residential, commercial and industrial customers and regulated retail natural gas customers primarily in northern Nevada. NV Energy is an indirect wholly owned subsidiary of Berkshire Hathaway Energy Company (" BHE "). BHE is a holding company based in Des Moines, Iowa that owns subsidiaries principally engaged in energy businesses. BHE is a consolidated subsidiary of Berkshire Hathaway Inc. (" Berkshire Hathaway "). The unaudited Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and the United States Securities and Exchange Commission's rules and regulations for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the disclosures required by GAAP for annual financial statements. Management believes the unaudited Consolidated Financial Statements contain all adjustments (consisting only of normal recurring adjustments) considered necessary for the fair presentation of the unaudited Consolidated Financial Statements as of September 30, 2017 and for the three- and nine-month periods ended September 30, 2017 and 2016 . The Consolidated Statements of Comprehensive Income have been omitted as net income equals comprehensive income for the three- and nine-month periods ended September 30, 2017 and 2016 . The results of operations for the three- and nine-month periods ended September 30, 2017 are not necessarily indicative of the results to be expected for the full year. The preparation of the unaudited Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the unaudited Consolidated Financial Statements and the reported amounts of revenue and expenses during the period. Actual results may differ from the estimates used in preparing the unaudited Consolidated Financial Statements. Note 2 of Notes to Consolidated Financial Statements included in Sierra Pacific's Annual Report on Form 10-K for the year ended December 31, 2016 describes the most significant accounting policies used in the preparation of the unaudited Consolidated Financial Statements. There have been no significant changes in Sierra Pacific's assumptions regarding significant accounting estimates and policies during the nine-month period ended September 30, 2017 .

New Accounting Pronouncements

New Accounting Pronouncements	9 Months Ended
	Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	New Accounting Pronouncements In August 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2017-12, which amends FASB Accounting Standards Codification ("ASC") Topic 815, "Derivatives and Hedging." The amendments in this guidance update the hedge accounting model to enable entities to better portray the economics of their risk management activities in the financial statements, expands an entity’s ability to hedge non-financial and financial risk components and reduces complexity in fair value hedges of interest rate risk. In addition, it eliminates the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in fair value of a hedging instrument to be presented in the same income statement line as the hedged item and also eases certain documentation and assessment requirements. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach by means of a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption. The Company is currently evaluating the impact of adopting this guidance on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In March 2017, the FASB issued ASU No. 2017-07, which amends FASB ASC Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance require that an employer disaggregate the service cost component from the other components of net benefit cost and report the service cost component in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of operating income. Additionally, the guidance only allows the service cost component to be eligible for capitalization when applicable. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted. This guidance must be adopted retrospectively for the presentation of the service cost component and the other components of net benefit cost in the statement of operations and prospectively for the capitalization of the service cost component in the balance sheet. The Company plans to adopt this guidance effective January 1, 2018. The Company does not believe this will have a material impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In November 2016, the FASB issued ASU No. 2016-18, which amends FASB ASC Subtopic 230-10, "Statement of Cash Flows - Overall." The amendments in this guidance require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted, and is required to be adopted retrospectively. The Company plans to adopt this guidance effective January 1, 2018 and does not believe the adoption of this guidance will have a material impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In August 2016, the FASB issued ASU No. 2016-15, which amends FASB ASC Topic 230, "Statement of Cash Flows." The amendments in this guidance address the classification of eight specific cash flow issues within the statement of cash flows with the objective of reducing the existing diversity in practice. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted, and is required to be adopted retrospectively. The Company plans to adopt this guidance effective January 1, 2018 and does not believe the adoption of this guidance will have a material impact on its Consolidated Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. The Company plans to adopt this guidance effective January 1, 2019 and is currently evaluating the impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In January 2016, the FASB issued ASU No. 2016-01, which amends FASB ASC Subtopic 825-10, "Financial Instruments - Overall." The amendments in this guidance address certain aspects of recognition, measurement, presentation and disclosure of financial instruments including a requirement that all investments in equity securities that do not qualify for equity method accounting or result in consolidation of the investee be measured at fair value with changes in fair value recognized in net income. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption not permitted, and is required to be adopted prospectively by means of a cumulative-effect adjustment to the balance sheet as of the beginning of the fiscal year of adoption. The Company is currently evaluating the impact of adopting this guidance on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. The material impacts currently identified include recording the unrealized gains and losses on available-for-sale securities in the Consolidated Statements of Operations as opposed to other comprehensive income ("OCI"). For the nine-month periods ended September 30, 2017 and 2016 , these amounts, net of tax, were 542 million and 151 million , respectively. In May 2014, the FASB issued ASU No. 2014-09, which creates FASB ASC Topic 606, "Revenue from Contracts with Customers" and supersedes ASC Topic 605, "Revenue Recognition." The guidance replaces industry-specific guidance and establishes a single five-step model to identify and recognize revenue. The core principle of the guidance is that an entity should recognize revenue upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. Additionally, the guidance requires the entity to disclose further quantitative and qualitative information regarding the nature and amount of revenues arising from contracts with customers, as well as other information about the significant judgments and estimates used in recognizing revenues from contracts with customers. In August 2015, the FASB issued ASU No. 2015-14, which defers the effective date of ASU No. 2014-09 one year to interim and annual reporting periods beginning after December 15, 2017. During 2016 and 2017, the FASB issued several ASUs that clarify the implementation guidance for ASU No. 2014-09 but do not change the core principle of the guidance. This guidance may be adopted retrospectively or under a modified retrospective method where the cumulative effect is recognized at the date of initial application. The Company plans to adopt this guidance effective January 1, 2018 under the modified retrospective method and is currently evaluating the impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. The Company currently does not expect the timing and amount of revenue currently recognized to be materially different after adoption of the new guidance as a majority of revenue is recognized when the Company has the right to invoice as it corresponds directly with the value to the customer of the Company’s performance to date. The Company's current plan is to quantitatively disaggregate revenue in the required financial statement footnote by regulated energy, nonregulated energy and real estate, with further disaggregation of regulated energy by jurisdiction and real estate by line of business.
PacifiCorp [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	New Accounting Pronouncements In March 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2017-07, which amends FASB Accounting Standards Codification ("ASC") Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance require that an employer disaggregate the service cost component from the other components of net benefit cost and report the service cost component in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of operating income. Additionally, the guidance only allows the service cost component to be eligible for capitalization when applicable. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted. This guidance must be adopted retrospectively for the presentation of the service cost component and the other components of net benefit cost in the statement of operations and prospectively for the capitalization of the service cost component in the balance sheet. PacifiCorp plans to adopt this guidance effective January 1, 2018. PacifiCorp does not believe this will have a material impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In November 2016, the FASB issued ASU No. 2016-18, which amends FASB ASC Subtopic 230-10, "Statement of Cash Flows - Overall." The amendments in this guidance require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted, and is required to be adopted retrospectively. PacifiCorp plans to adopt this guidance effective January 1, 2018 and does not believe the adoption of this guidance will have a material impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In August 2016, the FASB issued ASU No. 2016-15, which amends FASB ASC Topic 230, "Statement of Cash Flows." The amendments in this guidance address the classification of eight specific cash flow issues within the statement of cash flows with the objective of reducing the existing diversity in practice. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted, and is required to be adopted retrospectively. PacifiCorp plans to adopt this guidance effective January 1, 2018 and does not believe the adoption of this guidance will have a material impact on its Consolidated Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. PacifiCorp plans to adopt this guidance effective January 1, 2019 and is currently evaluating the impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In January 2016, the FASB issued ASU No. 2016-01, which amends FASB ASC Subtopic 825-10, "Financial Instruments - Overall." The amendments in this guidance address certain aspects of recognition, measurement, presentation and disclosure of financial instruments including a requirement that all investments in equity securities that do not qualify for equity method accounting or result in consolidation of the investee be measured at fair value with changes in fair value recognized in net income. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption not permitted, and is required to be adopted prospectively by means of a cumulative-effect adjustment to the balance sheet as of the beginning of the fiscal year of adoption. PacifiCorp is currently evaluating the impact of adopting this guidance on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. PacifiCorp does not believe this will have a material impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In May 2014, the FASB issued ASU No. 2014-09, which creates FASB ASC Topic 606, "Revenue from Contracts with Customers" and supersedes ASC Topic 605, "Revenue Recognition." The guidance replaces industry-specific guidance and establishes a single five-step model to identify and recognize revenue. The core principle of the guidance is that an entity should recognize revenue upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. Additionally, the guidance requires the entity to disclose further quantitative and qualitative information regarding the nature and amount of revenues arising from contracts with customers, as well as other information about the significant judgments and estimates used in recognizing revenues from contracts with customers. In August 2015, the FASB issued ASU No. 2015-14, which defers the effective date of ASU No. 2014-09 one year to interim and annual reporting periods beginning after December 15, 2017. During 2016 and 2017, the FASB issued several ASUs that clarify the implementation guidance for ASU No. 2014-09 but do not change the core principle of the guidance. This guidance may be adopted retrospectively or under a modified retrospective method where the cumulative effect is recognized at the date of initial application. PacifiCorp plans to adopt this guidance effective January 1, 2018 under the modified retrospective method and is currently evaluating the impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. PacifiCorp currently does not expect the timing and amount of revenue currently recognized to be materially different after adoption of the new guidance as a majority of revenue is recognized when PacifiCorp has the right to invoice as it corresponds directly with the value to the customer of PacifiCorp’s performance to date. PacifiCorp plans to quantitatively disaggregate revenue in the required financial statement footnote by customer class.
MidAmerican Energy Company [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	New Accounting Pronouncements In March 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2017-07, which amends FASB Accounting Standards Codification ("ASC") Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance require that an employer disaggregate the service cost component from the other components of net benefit cost and report the service cost component in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of operating income. Additionally, the guidance only allows the service cost component to be eligible for capitalization when applicable. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted. This guidance must be adopted retrospectively for the presentation of the service cost component and the other components of net benefit cost in the statement of operations and prospectively for the capitalization of the service cost component in the balance sheet. MidAmerican Energy plans to adopt this guidance effective January 1, 2018. MidAmerican Energy does not believe this will have a material impact on its Financial Statements and disclosures included within Notes to Financial Statements. In November 2016, the FASB issued ASU No. 2016-18, which amends FASB ASC Subtopic 230-10, "Statement of Cash Flows - Overall." The amendments in this guidance require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents must be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted, and is required to be adopted retrospectively. MidAmerican Energy plans to adopt this guidance effective January 1, 2018, and does not believe the adoption of this guidance will have a material impact on its Financial Statements and disclosures included within Notes to Financial Statements. In August 2016, the FASB issued ASU No. 2016-15, which amends FASB ASC Topic 230, "Statement of Cash Flows." The amendments in this guidance address the classification of eight specific cash flow issues within the statement of cash flows with the objective of reducing the existing diversity in practice. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted, and is required to be adopted retrospectively. MidAmerican Energy plans to adopt this guidance effective January 1, 2018, and does not believe the adoption of this guidance will have a material impact on its Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. MidAmerican Energy plans to adopt this guidance effective January 1, 2019, and is currently evaluating the impact on its Financial Statements and disclosures included within Notes to Financial Statements. In January 2016, the FASB issued ASU No. 2016-01, which amends FASB ASC Subtopic 825-10, "Financial Instruments - Overall." The amendments in this guidance address certain aspects of recognition, measurement, presentation and disclosure of financial instruments including a requirement that all investments in equity securities that do not qualify for equity method accounting or result in consolidation of the investee be measured at fair value with changes in fair value recognized in net income. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption not permitted, and is required to be adopted prospectively by means of a cumulative-effect adjustment to the balance sheet as of the beginning of the fiscal year of adoption. MidAmerican Energy is currently evaluating the impact of adopting this guidance on its Financial Statements and disclosures included within Notes to Financial Statements. MidAmerican Energy does not believe this guidance will have a material impact on its Financial Statements and disclosures included within Notes to Financial Statements. In May 2014, the FASB issued ASU No. 2014-09, which creates FASB ASC Topic 606, "Revenue from Contracts with Customers" and supersedes ASC Topic 605, "Revenue Recognition." The guidance replaces industry-specific guidance and establishes a single five-step model to identify and recognize revenue. The core principle of the guidance is that an entity should recognize revenue upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. Additionally, the guidance requires the entity to disclose further quantitative and qualitative information regarding the nature and amount of revenues arising from contracts with customers, as well as other information about the significant judgments and estimates used in recognizing revenues from contracts with customers. In August 2015, the FASB issued ASU No. 2015-14, which defers the effective date of ASU No. 2014-09 one year to interim and annual reporting periods beginning after December 15, 2017. During 2016 and 2017, the FASB issued several ASUs that clarify the implementation guidance for ASU No. 2014-09 but do not change the core principle of the guidance. This guidance may be adopted retrospectively or under a modified retrospective method where the cumulative effect is recognized at the date of initial application. MidAmerican Energy plans to adopt this guidance effective January 1, 2018 under the modified retrospective method and is currently evaluating the impact on its Financial Statements and disclosures included within Notes to Financial Statements. MidAmerican Energy currently does not expect the timing and amount of revenue currently recognized to be materially different after adoption of the new guidance as a majority of revenue is recognized when MidAmerican Energy has the right to invoice as it corresponds directly with the value to the customer of MidAmerican Energy’s performance to date. MidAmerican Energy's current plan is to quantitatively disaggregate revenue in the required financial statement footnote by jurisdiction for each segment.
MidAmerican Funding, LLC and Subsidiaries [Domain]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	New Accounting Pronouncements Refer to Note 2 of MidAmerican Energy's Notes to Financial Statements.
Nevada Power Company [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	New Accounting Pronouncements In March 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2017-07, which amends FASB Accounting Standards Codification ("ASC") Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance require that an employer disaggregate the service cost component from the other components of net benefit cost and report the service cost component in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of operating income. Additionally, the guidance only allows the service cost component to be eligible for capitalization when applicable. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted. This guidance must be adopted retrospectively for the presentation of the service cost component and the other components of net benefit cost in the statement of operations and prospectively for the capitalization of the service cost component in the balance sheet. Nevada Power plans to adopt this guidance effective January 1, 2018. Nevada Power does not believe this will have a material impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In November 2016, the FASB issued ASU No. 2016-18, which amends FASB ASC Subtopic 230-10, "Statement of Cash Flows - Overall." The amendments in this guidance require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted, and is required to be adopted retrospectively. Nevada Power plans to adopt this guidance effective January 1, 2018 and does not believe the adoption of this guidance will have a material impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In August 2016, the FASB issued ASU No. 2016-15, which amends FASB ASC Topic 230, "Statement of Cash Flows." The amendments in this guidance address the classification of eight specific cash flow issues within the statement of cash flows with the objective of reducing the existing diversity in practice. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted, and is required to be adopted retrospectively. Nevada Power plans to adopt this guidance effective January 1, 2018 and does not believe the adoption of this guidance will have a material impact on its Consolidated Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. Nevada Power plans to adopt this guidance effective January 1, 2019 and is currently evaluating the impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In May 2014, the FASB issued ASU No. 2014-09, which creates FASB ASC Topic 606, "Revenue from Contracts with Customers" and supersedes ASC Topic 605, "Revenue Recognition." The guidance replaces industry-specific guidance and establishes a single five-step model to identify and recognize revenue. The core principle of the guidance is that an entity should recognize revenue upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. Additionally, the guidance requires the entity to disclose further quantitative and qualitative information regarding the nature and amount of revenues arising from contracts with customers, as well as other information about the significant judgments and estimates used in recognizing revenues from contracts with customers. In August 2015, the FASB issued ASU No. 2015-14, which defers the effective date of ASU No. 2014-09 one year to interim and annual reporting periods beginning after December 15, 2017. During 2016 and 2017, the FASB issued several ASUs that clarify the implementation guidance for ASU No. 2014-09 but do not change the core principle of the guidance. This guidance may be adopted retrospectively or under a modified retrospective method where the cumulative effect is recognized at the date of initial application. Nevada Power plans to adopt this guidance effective January 1, 2018 under the modified retrospective method and is currently evaluating the impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. Nevada Power currently does not expect the timing and amount of revenue currently recognized to be materially different after adoption of the new guidance as a majority of revenue is recognized when Nevada Power has the right to invoice as it corresponds directly with the value to the customer of Nevada Power’s performance to date. Nevada Power's current plan is to quantitatively disaggregate revenue in the required financial statement footnote by customer class.
Sierra Pacific Power Company [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	New Accounting Pronouncements In March 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2017-07, which amends FASB Accounting Standards Codification ("ASC") Topic 715, "Compensation - Retirement Benefits." The amendments in this guidance require that an employer disaggregate the service cost component from the other components of net benefit cost and report the service cost component in the same line item as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of operating income. Additionally, the guidance only allows the service cost component to be eligible for capitalization when applicable. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted. This guidance must be adopted retrospectively for the presentation of the service cost component and the other components of net benefit cost in the statement of operations and prospectively for the capitalization of the service cost component in the balance sheet. Sierra Pacific plans to adopt this guidance effective January 1, 2018. Sierra Pacific does not believe this will have a material impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In November 2016, the FASB issued ASU No. 2016-18, which amends FASB ASC Subtopic 230-10, "Statement of Cash Flows - Overall." The amendments in this guidance require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted, and is required to be adopted retrospectively. Sierra Pacific plans to adopt this guidance effective January 1, 2018 and does not believe the adoption of this guidance will have a material impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In August 2016, the FASB issued ASU No. 2016-15, which amends FASB ASC Topic 230, "Statement of Cash Flows." The amendments in this guidance address the classification of eight specific cash flow issues within the statement of cash flows with the objective of reducing the existing diversity in practice. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted, and is required to be adopted retrospectively. Sierra Pacific plans to adopt this guidance effective January 1, 2018 and does not believe the adoption of this guidance will have a material impact on its Consolidated Financial Statements. In February 2016, the FASB issued ASU No. 2016-02, which creates FASB ASC Topic 842, "Leases" and supersedes Topic 840 "Leases." This guidance increases transparency and comparability among entities by recording lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. A lessee should recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous guidance. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted, and is required to be adopted using a modified retrospective approach. Sierra Pacific plans to adopt this guidance effective January 1, 2019 and is currently evaluating the impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. In May 2014, the FASB issued ASU No. 2014-09, which creates FASB ASC Topic 606, "Revenue from Contracts with Customers" and supersedes ASC Topic 605, "Revenue Recognition." The guidance replaces industry-specific guidance and establishes a single five-step model to identify and recognize revenue. The core principle of the guidance is that an entity should recognize revenue upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. Additionally, the guidance requires the entity to disclose further quantitative and qualitative information regarding the nature and amount of revenues arising from contracts with customers, as well as other information about the significant judgments and estimates used in recognizing revenues from contracts with customers. In August 2015, the FASB issued ASU No. 2015-14, which defers the effective date of ASU No. 2014-09 one year to interim and annual reporting periods beginning after December 15, 2017. During 2016 and 2017, the FASB issued several ASUs that clarify the implementation guidance for ASU No. 2014-09 but do not change the core principle of the guidance. This guidance may be adopted retrospectively or under a modified retrospective method where the cumulative effect is recognized at the date of initial application. Sierra Pacific plans to adopt this guidance effective January 1, 2018 under the modified retrospective method and is currently evaluating the impact on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements. Sierra Pacific currently does not expect the timing and amount of revenue currently recognized to be materially different after adoption of the new guidance as a majority of revenue is recognized when Sierra Pacific has the right to invoice as it corresponds directly with the value to the customer of Sierra Pacific’s performance to date. Sierra Pacific's current plan is to quantitatively disaggregate revenue in the required financial statement footnote by segment and customer class.

Business Acquisitions (Notes)

Business Acquisitions (Notes)	9 Months Ended
	Sep. 30, 2017
Business Acquisitions [Abstract]
Business Combination Disclosure [Text Block]	Business Acquisitions The Company completed various acquisitions totaling $1.1 billion , net of cash acquired, for the nine-month period ended September 30, 2017 . The purchase price for each acquisition was allocated to the assets acquired and liabilities assumed, which primarily related to residential real estate brokerage businesses, development and construction costs for the 110-megawatt Alamo 6 solar project and the 50-megawatt Pearl solar project, and the remaining 25% interest in the Silverhawk natural gas-fueled generation facility at Nevada Power. As a result of the various acquisitions, the Company acquired assets of $1.1 billion , assumed liabilities of $476 million and recognized goodwill of $522 million .

Property, Plant and Equipment,

Property, Plant and Equipment, Net	9 Months Ended
	Sep. 30, 2017
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Net	Property, plant and equipment, net consists of the following (in millions): As of Depreciable September 30, December 31, Life 2017 2016 Regulated assets: Utility generation, transmission and distribution systems 5-80 years $ 73,138 $ 71,536 Interstate natural gas pipeline assets 3-80 years 6,991 6,942 80,129 78,478 Accumulated depreciation and amortization (24,525 ) (23,603 ) Regulated assets, net 55,604 54,875 Nonregulated assets: Independent power plants 5-30 years 5,911 5,594 Other assets 3-30 years 1,265 1,002 7,176 6,596 Accumulated depreciation and amortization (1,304 ) (1,060 ) Nonregulated assets, net 5,872 5,536 Net operating assets 61,476 60,411 Construction work-in-progress 3,503 2,098 Property, plant and equipment, net $ 64,979 $ 62,509 Construction work-in-progress includes $3.1 billion as of September 30, 2017 and $1.8 billion as of December 31, 2016 , related to the construction of regulated assets. During the fourth quarter of 2016, MidAmerican Energy revised its electric and gas depreciation rates based on the results of a new depreciation study, the most significant impact of which was longer estimated useful lives for certain wind-powered generating facilities. The effect of this change was to reduce depreciation and amortization expense by $34 million annually, or $9 million and $26 million for the three- and nine-month periods ended September 30, 2017 , based on depreciable plant balances at the time of the change.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Net	Property, Plant and Equipment, Net Refer to Note 3 of MidAmerican Energy's Notes to Financial Statements. In addition to MidAmerican Energy's property, plant and equipment, net, MidAmerican Funding had as of September 30, 2017 and December 31, 2016 , nonregulated property gross of $25 million and $22 million , respectively, related accumulated depreciation and amortization of $10 million and $9 million , respectively, and construction work-in-progress of $- million and $1 million , respectively, which consisted primarily of a corporate aircraft owned by MHC.
MidAmerican Energy Company [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Net	Property, Plant and Equipment, Net Property, plant and equipment, net consists of the following (in millions): As of September 30, December 31, Depreciable Life 2017 2016 Utility plant in service, net: Generation 20-70 years $ 11,339 $ 11,282 Transmission 52-75 years 1,802 1,726 Electric distribution 20-75 years 3,297 3,197 Gas distribution 29-75 years 1,606 1,565 Utility plant in service 18,044 17,770 Accumulated depreciation and amortization (5,765 ) (5,448 ) Utility plant in service, net 12,279 12,322 Nonregulated property, net: Nonregulated property gross 20-50 years 7 7 Accumulated depreciation and amortization (1 ) (1 ) Nonregulated property, net 6 6 12,285 12,328 Construction work-in-progress 1,302 493 Property, plant and equipment, net $ 13,587 $ 12,821 During the fourth quarter of 2016, MidAmerican Energy revised its electric and gas depreciation rates based on the results of a new depreciation study, the most significant impact of which was longer estimated useful lives for certain wind-powered generating facilities. The effect of this change was to reduce depreciation and amortization expense by $34 million annually, or $9 million and $26 million for the three- and nine-month periods ended September 30, 2017 , based on depreciable plant balances at the time of the change.
PacifiCorp [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Net	Property, Plant and Equipment, Net Property, plant and equipment, net consists of the following (in millions): As of September 30, December 31, Depreciable Life 2017 2016 Property, plant and equipment in-service 5-75 years $ 27,599 $ 27,298 Accumulated depreciation and amortization (9,222 ) (8,793 ) Net property, plant and equipment in-service 18,377 18,505 Construction work-in-progress 758 657 Total property, plant and equipment, net $ 19,135 $ 19,162
Nevada Power Company [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Net	Property, Plant and Equipment, Net Property, plant and equipment, net consists of the following (in millions): As of Depreciable Life September 30, December 31, 2017 2016 Utility plant: Generation 30 - 55 years $ 3,725 $ 4,271 Distribution 20 - 65 years 3,294 3,231 Transmission 45 - 65 years 1,860 1,846 General and intangible plant 5 - 65 years 784 738 Utility plant 9,663 10,086 Accumulated depreciation and amortization (2,840 ) (3,205 ) Utility plant, net 6,823 6,881 Other non-regulated, net of accumulated depreciation and amortization 45 years 2 2 Plant, net 6,825 6,883 Construction work-in-progress 65 114 Property, plant and equipment, net $ 6,890 $ 6,997 Acquisitions In April 2017, Nevada Power purchased the remaining 25% interest in the Silverhawk natural gas-fueled generating facility for $77 million . The Public Utilities Commission of Nevada ("PUCN") approved the purchase of the facility in Nevada Power’s triennial Integrated Resource Plan filing in December 2015. The purchase price was allocated to the assets acquired, consisting primarily of generation utility plant, and no significant liabilities were assumed.
Sierra Pacific Power Company [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Net	Property, Plant and Equipment, Net Property, plant and equipment, net consists of the following (in millions): As of Depreciable Life September 30, December 31, 2017 2016 Utility plant: Electric generation 25 - 60 years $ 1,140 $ 1,137 Electric distribution 20 - 100 years 1,445 1,417 Electric transmission 50 - 100 years 782 771 Electric general and intangible plant 5 - 70 years 182 164 Natural gas distribution 35 - 70 years 388 381 Natural gas general and intangible plant 5 - 70 years 14 15 Common general 5 - 70 years 290 267 Utility plant 4,241 4,152 Accumulated depreciation and amortization (1,496 ) (1,442 ) Utility plant, net 2,745 2,710 Other non-regulated, net of accumulated depreciation and amortization 70 years 5 5 Plant, net 2,750 2,715 Construction work-in-progress 112 107 Property, plant and equipment, net $ 2,862 $ 2,822 During 2016, Sierra Pacific revised its electric and gas depreciation rates based on the results of a new depreciation study, the most significant impact of which was shorter estimated useful lives at the Valmy Generating Station. The effect of this change will increase depreciation and amortization expense by $9 million annually based on depreciable plant balances at the time of the change. However, the Public Utilities Commission of Nevada ("PUCN") ordered the change relating to the Valmy Generating Station of $7 million annually be deferred for future recovery through a regulatory asset.

Regulatory Matters

Regulatory Matters	9 Months Ended
	Sep. 30, 2017
Nevada Power Company [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory Matters	Regulatory Matters Deferred Energy Nevada statutes permit regulated utilities to adopt deferred energy accounting procedures. The intent of these procedures is to ease the effect on customers of fluctuations in the cost of purchased natural gas, fuel and electricity and are subject to annual prudency review by the PUCN. Under deferred energy accounting, to the extent actual fuel and purchased power costs exceed fuel and purchased power costs recoverable through current rates that excess is not recorded as a current expense on the Consolidated Statements of Operations but rather is deferred and recorded as a regulatory asset on the Consolidated Balance Sheets. Conversely, a regulatory liability is recorded to the extent fuel and purchased power costs recoverable through current rates exceed actual fuel and purchased power costs. These excess amounts are reflected in quarterly adjustments to rates and recorded as cost of fuel, energy and capacity in future time periods. Chapter 704B Applications Chapter 704B of the Nevada Revised Statutes allows retail electric customers with an average annual load of one megawatt (" MW ") or more to file with the PUCN an application to purchase energy from alternative providers of a new electric resource and become distribution only service customers. On a case-by-case basis, the PUCN will assess the application and may deny or grant the application subject to conditions, including paying an impact fee, paying on-going charges and receiving approval for specific alternative energy providers and terms. The impact fee and on-going charges are assessed to alleviate the burden on other Nevada customers for the applicant's share of previously committed investments and long-term renewable contracts and are set at a level designed such that the remaining customers are not subjected to increased costs. In May 2015, MGM Resorts International ("MGM") and Wynn Las Vegas, LLC ("Wynn"), filed applications with the PUCN to purchase energy from alternative providers of a new electric resource and become distribution only service customers of Nevada Power. In December 2015, the PUCN granted the applications subject to conditions, including paying an impact fee, on-going charges and receiving approval for specific alternative energy providers and terms. In December 2015, the applicants filed petitions for reconsideration. In January 2016, the PUCN granted reconsideration and updated some of the terms, including removing a limitation related to energy purchased indirectly from NV Energy. In September 2016, MGM and Wynn paid impact fees of $82 million and $15 million , respectively . In October 2016, MGM and Wynn became distribution only service customers and started procuring energy from another energy supplier. In April 2017, Wynn filed a motion with the PUCN seeking relief from the January 2016 order and requested the PUCN adopt an alternative impact fee and revise on-going charges associated with retirement of assets and high cost renewable contracts. In May 2017, a stipulation reached between MGM, Regulatory Operations Staff and the Bureau of Consumer Protection was filed requiring Nevada Power to credit $16 million as an offset against MGM's remaining impact fee obligation and, in June 2017, the PUCN approved the stipulation as filed. In September 2016, Switch, Ltd. ("Switch"), a customer of Nevada Power , filed an application with the PUCN to purchase energy from alternative providers of a new electric resource and become a distribution only service customer of Nevada Power . In December 2016, the PUCN approved a stipulation agreement that allows Switch to purchase energy from alternative providers subject to conditions , including paying an impact fee to Nevada Power. In May 2017, Switch paid impact fees of $27 million and, in June 2017, Switch became a distribution only service customer and started procuring energy from another energy supplier. In November 2016, Caesars Enterprise Service ("Caesars"), a customer of Nevada Power , filed an application with the PUCN to purchase energy from alternative providers of a new electric resource and become a distribution only service customer of Nevada Power. In March 2017, the PUCN approved the application allowing Caesars to purchase energy from alternative providers subject to conditions, including paying an impact fee. In March 2017, Caesars provided notice that it intends to pay the impact fee and proceed with purchasing energy from alternative providers. In July 2017, Caesars made the required compliance filings and, in September 2017, the PUCN issued an order allowing Caesars to acquire electric energy and ancillary services from another energy supplier and become a distribution only service customer of Nevada Power. Emissions Reduction and Capacity Replacement Plan ("ERCR Plan") In March 2017, Nevada Power retired Reid Gardner Unit 4, a 257 -MW coal-fueled generating facility. The early retirement was approved by the PUCN in December 2016 as a part of Nevada Power's second amendment to the ERCR Plan. The remaining net book value of $151 million was moved from property, plant and equipment, net to noncurrent regulatory assets on the Consolidated Balance Sheet in March 2017, in compliance with the ERCR Plan. Refer to Note 9 for additional information on the ERCR Plan.
Sierra Pacific Power Company [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory Matters	Regulatory Matters Deferred Energy Nevada statutes permit regulated utilities to adopt deferred energy accounting procedures. The intent of these procedures is to ease the effect on customers of fluctuations in the cost of purchased natural gas, fuel and electricity and are subject to annual prudency review by the PUCN. Under deferred energy accounting, to the extent actual fuel and purchased power costs exceed fuel and purchased power costs recoverable through current rates that excess is not recorded as a current expense on the Consolidated Statements of Operations but rather is deferred and recorded as a regulatory asset on the Consolidated Balance Sheets. Conversely, a regulatory liability is recorded to the extent fuel and purchased power costs recoverable through current rates exceed actual fuel and purchased power costs. These excess amounts are reflected in quarterly adjustments to rates and recorded as cost of fuel, energy and capacity in future time periods. Regulatory Rate Review In June 2016, Sierra Pacific filed an electric regulatory rate review with the PUCN. The filing requested no incremental annual revenue relief. In October 2016, Sierra Pacific filed with the PUCN a settlement agreement resolving most, but not all, issues in the proceeding and reduced Sierra Pacific's electric revenue requirement by $3 million spread evenly to all rate classes. In December 2016, the PUCN approved the settlement agreement and established an additional six MW of net metering capacity under the grandfathered rates, which are those net metering rates that were in effect prior to January 2016; the order establishes cost-based rates and a value-based excess energy credit for customers who choose to install private generation after the six MW limitation is reached. The new rates were effective January 1, 2017. In January 2017, Sierra Pacific filed a petition for reconsideration relating to the creation of the additional six megawatts (" MW ") of net metering at the grandfathered rates. Sierra Pacific believes the effects of the PUCN decision result in additional cost shifting to non-net metering customers and reduces the stipulated rate reduction for other customer classes. In June 2017, the PUCN denied the petition for reconsideration. In June 2016, Sierra Pacific filed a gas regulatory rate review with the PUCN. The filing requested a slight decrease in its incremental annual revenue requirement. In October 2016, Sierra Pacific filed with the PUCN a settlement agreement resolving all issues in the proceeding and reduced Sierra Pacific's gas revenue requirement by $2 million . In December 2016, the PUCN approved the settlement agreement. The new rates were effective January 1, 2017. Chapter 704B Applications Chapter 704B of the Nevada Revised Statutes allows retail electric customers with an average annual load of one megawatt (" MW ") or more to file with the PUCN an application to purchase energy from alternative providers of a new electric resource and become distribution only service customers. On a case-by-case basis, the PUCN will assess the application and may deny or grant the application subject to conditions, including paying an impact fee, paying on-going charges and receiving approval for specific alternative energy providers and terms. The impact fee and on-going charges are assessed to alleviate the burden on other Nevada customers for the applicant's share of previously committed investments and long-term renewable contracts and are set at a level designed such that the remaining customers are not subjected to increased costs. In September 2016, Switch, Ltd. ("Switch"), a customer of Sierra Pacific , filed an application with the PUCN to purchase energy from alternative providers of a new electric resource and become a distribution only service customer of Sierra Pacific . In December 2016, the PUCN approved a stipulation agreement that allows Switch to purchase energy from alternative providers subject to conditions . In June 2017, Switch became a distribution only service customer and started procuring energy from another energy supplier. In November 2016, Caesars Enterprise Service ("Caesars"), a customer of Sierra Pacific , filed an application with the PUCN to purchase energy from alternative providers of a new electric resource and become a distribution only service customer of Sierra Pacific. In March 2017, the PUCN approved the application allowing Caesars to purchase energy from alternative providers subject to conditions, including paying an impact fee. In March 2017, Caesars provided notice that it intends to pay the impact fee and proceed with purchasing energy from alternative providers. In July 2017, Caesars made the required compliance filings and, in September 2017, the PUCN issued an order allowing Caesars to acquire electric energy and ancillary services from another energy supplier and become a distribution only service customer of Sierra Pacific. In May 2017, Peppermill Resort Spa Casino ("Peppermill"), a customer of Sierra Pacific, filed an application with the PUCN to purchase energy from alternative providers of a new electric resource and become a distribution only service customer of Sierra Pacific. In August 2017, the PUCN approved a stipulation allowing Peppermill to purchase energy from alternative providers subject to conditions, including paying an impact fee. In September 2017, Peppermill provided notice that it intends to pay the impact fee and proceed with purchasing energy from alternative providers.

Investments and Restricted Cash

Investments and Restricted Cash and Investments	9 Months Ended
	Sep. 30, 2017
Investments and Restricted Cash and Investments [Abstract]
Investments and Restricted Cash and Investments	Investments and Restricted Cash and Investments Investments and restricted cash and investments consists of the following (in millions): As of September 30, December 31, 2017 2016 Investments: BYD Company Limited common stock $ 2,087 $ 1,185 Rabbi trusts 431 403 Other 132 106 Total investments 2,650 1,694 Equity method investments: BHE Renewables tax equity investments 804 741 Electric Transmission Texas, LLC 693 672 Bridger Coal Company 140 165 Other 158 142 Total equity method investments 1,795 1,720 Restricted cash and investments: Quad Cities Station nuclear decommissioning trust funds 498 460 Other 317 282 Total restricted cash and investments 815 742 Total investments and restricted cash and investments $ 5,260 $ 4,156 Reflected as: Other current assets $ 273 $ 211 Noncurrent assets 4,987 3,945 Total investments and restricted cash and investments $ 5,260 $ 4,156 Investments BHE 's investment in BYD Company Limited common stock is accounted for as an available-for-sale security with changes in fair value recognized in accumulated other comprehensive income (loss) ("AOCI"). The fair value of BHE 's investment in BYD Company Limited common stock reflects a pre-tax unrealized gain of $1,855 million and $953 million as of September 30, 2017 and December 31, 2016 , respectively.

Recent Financing Transactions

Recent Financing Transactions	9 Months Ended
	Sep. 30, 2017
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions Long-Term Debt In the first nine months of 2017, BHE repaid at par value a total of $944 million , plus accrued interest, of its junior subordinated debentures due December 2044. In September 2017, HomeServices entered into a $250 million unsecured amortizing term loan due September 2022. The amortizing term loan has an underlying variable interest rate based on the London Interbank Offered Rate ("LIBOR") plus a spread that varies based on HomeServices' total net leverage ratio as of the last day of each quarter. The net proceeds were used to fund the repayment or reimbursement of amounts provided by BHE for the costs related to acquisitions. In July 2017, Northern Powergrid Metering Limited entered into a £200 million secured amortizing corporate facility with a stated maturity of June 2026. The amortizing facility has a variable interest rate based on the LIBOR plus a spread that varies based on an agreed-upon schedule. In July 2017, Northern Powergrid Metering Limited received proceeds of £120 million under the facility to repay amounts provided by Yorkshire Electricity Group plc which provides internal funds for the continuing smart meter deployment program of Northern Powergrid Metering Limited. Northern Powergrid Metering Limited has entered into interest rate swaps that fix the underlying interest rate on 85% of the outstanding debt. In July 2017, Cordova Funding Corporation redeemed the remaining $89 million of its 8.48% to 9.07% Series A Senior Secured Bonds due December 2019, CE Generation, LLC redeemed the remaining $51 million of its 7.416% Senior Secured Bonds due December 2018, and Salton Sea Funding Corporation redeemed the remaining $20 million of its 7.475% Senior Secured Series F Bonds due November 2018, each at redemption prices determined in accordance with the terms of the respective indentures. In June 2017, BHE issued $100 million of its 5.0% junior subordinated debentures due June 2057 in exchange for 181,819 shares of BHE no par value common stock held by a minority shareholder. The junior subordinated debentures are redeemable at BHE's option at any time from and after June 15, 2037, at par plus accrued and unpaid interest. In May 2017, Alamo 6, LLC issued $232 million of its 4.17% Senior Secured Notes due March 2042. The principal of the notes amortizes beginning March 2018 with a final maturity in March 2042. The net proceeds were used to fund the repayment or reimbursement of amounts provided by BHE for the costs related to the development, construction and financing of a 110-megawatt solar project in Texas. In April 2017, Kern River redeemed the remaining $175 million of its 4.893% Senior Notes due April 2018 at a redemption price determined in accordance with the terms of the indenture. In February 2017, MidAmerican Energy issued $375 million of its 3.10% First Mortgage Bonds due May 2027 and $475 million of its 3.95% First Mortgage Bonds due August 2047. An amount equal to the net proceeds was used to finance capital expenditures, disbursed during the period from February 2, 2016 to February 1, 2017, with respect to investments in MidAmerican Energy's 551-megawatt Wind X and 2,000-megawatt Wind XI projects, which were previously financed with MidAmerican Energy's general funds. In February 2017, MidAmerican Energy redeemed in full through optional redemption its $250 million of 5.95% Senior Notes due July 2017. Credit Facilities In September 2017, HomeServices terminated its $350 million unsecured credit facility expiring July 2018 and entered into a $600 million unsecured credit facility expiring September 2022. The credit facility, which is for general corporate purposes and provides for the issuance of letters of credit, has a variable interest rate based on the LIBOR or a base rate, at HomeServices' option, plus a spread that varies based on HomeServices' total net leverage ratio as of the last day of each quarter. In June 2017, BHE extended, with lender consent, the maturity date to June 2020 for its $2.0 billion unsecured credit facility and PacifiCorp extended, with lender consent, the maturity date to June 2020 for its $400 million unsecured credit facility, each by exercising the first of two available one-year extensions. In June 2017, PacifiCorp terminated its $600 million unsecured credit facility expiring March 2018 and entered into a $600 million unsecured credit facility expiring June 2020 with two one-year extension options subject to lender consent. The credit facility, which supports PacifiCorp's commercial paper program and certain series of its tax-exempt bond obligations and provides for the issuance of letters of credit, has a variable interest rate based on the Eurodollar rate or a base rate, at PacifiCorp's option, plus a spread that varies based on PacifiCorp's credit ratings for its senior unsecured long-term debt securities. The credit facility requires PacifiCorp's ratio of consolidated debt, including current maturities, to total capitalization not exceed 0.65 to 1.0 as of the last day of each quarter. In June 2017, MidAmerican Energy terminated its $600 million unsecured credit facility expiring March 2018 and entered into a $900 million unsecured credit facility expiring June 2020 with two one-year extension options subject to lender consent. The credit facility, which supports MidAmerican Energy's commercial paper program and its variable-rate tax-exempt bond obligations and provides for the issuance of letters of credit, has a variable interest rate based on the Eurodollar rate or a base rate, at MidAmerican Energy's option, plus a spread that varies based on MidAmerican Energy's credit ratings for senior unsecured long-term debt securities. The credit facility requires MidAmerican Energy's ratio of consolidated debt, including current maturities, to total capitalization not exceed 0.65 to 1.0 as of the last day of each quarter. In June 2017, Nevada Power amended its $400 million secured credit facility, extending the maturity date to June 2020 with two one-year extension options subject to lender consent. The amended credit facility, which is for general corporate purposes and provides for the issuance of letters of credit, has a variable interest rate based on the Eurodollar rate or a base rate, at Nevada Power's option, plus a spread that varies based on Nevada Power's credit ratings for its senior secured long-term debt securities. The amended credit facility requires Nevada Power's ratio of consolidated debt, including current maturities, to total capitalization not to exceed 0.65 to 1.0 as of the last day of each quarter. In June 2017, Sierra Pacific amended its $250 million secured credit facility, extending the maturity date to June 2020 with two one-year extension options subject to lender consent. The amended credit facility, which is for general corporate purposes and provides for the issuance of letters of credit, has a variable interest rate based on the Eurodollar rate or a base rate, at Sierra Pacific's option, plus a spread that varies based on Sierra Pacific's credit ratings for its senior secured long-term debt securities. The amended credit facility requires Sierra Pacific's ratio of consolidated debt, including current maturities, to total capitalization not exceed 0.65 to 1.0 as of the last day of each quarter. In May 2017, BHE entered into a $1.0 billion unsecured credit facility expiring May 2018. The credit facility, which is for general corporate purposes and also supports BHE's commercial paper program and provides for the issuance of letters of credit, has a variable interest rate based on the Eurodollar rate or a base rate, at BHE's option, plus a spread that varies based on BHE's credit ratings for its senior unsecured long-term debt securities. The credit facility requires BHE's ratio of consolidated debt, including current maturities, to total capitalization not exceed 0.70 to 1.0 as of the last day of each quarter.
Nevada Power Company [Member]
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions In January 2017, Nevada Power (1) issued a notice to the bondholders for the repurchase of the remaining outstanding amounts of its $38 million Pollution Control Revenue Bonds, Series 2006 and $38 million Pollution Control Revenue Bonds, Series 2006A and (2) redeemed the Pollution Control Revenue Bonds, Series 2006A, aggregate principal amount outstanding plus accrued interest with the use of cash on hand. In February 2017, Nevada Power redeemed the Pollution Control Revenue Bonds, Series 2006, aggregate principal amount outstanding plus accrued interest with the use of cash on hand. In May 2017, Nevada Power entered into a Financing Agreement with Clark County, Nevada (the "Clark Issuer") whereby the Clark Issuer loaned to Nevada Power the proceeds from the issuance, on behalf of Nevada Power, of $39.5 million of its 1.60% tax-exempt Pollution Control Refunding Revenue Bonds, Series 2017, due 2036 ("Series 2017 Bonds"). The Series 2017 Bonds are subject to mandatory purchase by Nevada Power in May 2020, and on and after the purchase date, the interest rate may be adjusted from time to time. In May 2017, Nevada Power entered into a Financing Agreement with the Coconino County, Arizona Pollution Control Corporation (the "Coconino Issuer") whereby the Coconino Issuer loaned to Nevada Power the proceeds from the issuance, on behalf of Nevada Power, of $40 million of its 1.80% tax-exempt Pollution Control Refunding Revenue Bonds, Series 2017A, due 2032 and $13 million of its 1.60% tax-exempt Pollution Control Refunding Revenue Bonds, Series 2017B, due 2039 (collectively, the "Series 2017AB Bonds"). The Series 2017AB Bonds are subject to mandatory purchase by Nevada Power in May 2020, and on and after the purchase date, the interest rate may be adjusted from time to time. To provide collateral security for its obligations, Nevada Power issued its General and Refunding Mortgage Notes, Series AA, No. AA-1 in the amount of $39.5 million and No. AA-2 in the amount of $53 million (collectively, the "Series AA Notes").The obligation of Nevada Power to make any payment of the principal and interest on any Series AA Notes is discharged to the extent Nevada Power has made payment on the Series 2017 Bonds and the Series 2017AB Bonds. The collective proceeds from the tax-exempt bond issuances were used to refund at par value, plus accrued interest, the Clark Issuer's $39.5 million of Pollution Control Refunding Revenue Bonds, Series 2006 and the Coconino Issuer's $40 million of Pollution Control Refunding Revenue Bonds, Series 2006A and $13 million of Pollution Control Refunding Revenue Bonds, Series 2006B, each previously issued on behalf of Nevada Power. In June 2017, Nevada Power amended its $400 million secured credit facility, extending the maturity date to June 2020 with two one-year extension options subject to lender consent. The amended credit facility, which is for general corporate purposes and provides for the issuance of letters of credit, has a variable interest rate based on the Eurodollar rate or a base rate, at Nevada Power's option, plus a spread that varies based on Nevada Power's credit ratings for its senior secured long-term debt securities. The amended credit facility requires Nevada Power's ratio of consolidated debt, including current maturities, to total capitalization not to exceed 0.65 to 1.0 as of the last day of each quarter.
PacifiCorp [Member]
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions In June 2017, PacifiCorp extended, with lender consent, the maturity date to June 2020 for its $400 million unsecured credit facility by exercising the first of two available one-year extensions. In June 2017, PacifiCorp terminated its $600 million unsecured credit facility expiring March 2018 and entered into a $600 million unsecured credit facility expiring June 2020 with two one-year extension options subject to lender consent. These credit facilities, which support PacifiCorp's commercial paper program and certain series of its tax-exempt bond obligations and provide for the issuance of letters of credit, have a variable interest rate based on the Eurodollar rate or a base rate, at PacifiCorp's option, plus a spread that varies based on PacifiCorp's credit ratings for its senior unsecured long-term debt securities. These credit facilities require PacifiCorp's ratio of consolidated debt, including current maturities, to total capitalization not exceed 0.65 to 1.0 as of the last day of each quarter.
MidAmerican Energy Company [Member]
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions Long-Term Debt In February 2017, MidAmerican Energy issued $375 million of its 3.10% First Mortgage Bonds due May 2027 and $475 million of its 3.95% First Mortgage Bonds due August 2047. An amount equal to the net proceeds was used to finance capital expenditures, disbursed during the period from February 2, 2016 to February 1, 2017, with respect to investments in MidAmerican Energy's 551-megawatt Wind X and 2,000-megawatt Wind XI projects, which were previously financed with MidAmerican Energy's general funds. In February 2017, MidAmerican Energy redeemed in full through optional redemption its $250 million of 5.95% Senior Notes due July 2017. Credit Facilities In June 2017, MidAmerican Energy terminated its $600 million unsecured credit facility expiring March 2018 and entered into a $900 million unsecured credit facility expiring June 2020 with two one-year extension options subject to lender consent. The credit facility, which supports MidAmerican Energy's commercial paper program and its variable-rate tax-exempt bond obligations and provides for the issuance of letters of credit, has a variable interest rate based on the Eurodollar rate or a base rate, at MidAmerican Energy's option, plus a spread that varies based on MidAmerican Energy's credit ratings for senior unsecured long-term debt securities. The credit facility requires MidAmerican Energy's ratio of consolidated debt, including current maturities, to total capitalization not exceed 0.65 to 1.0 as of the last day of each quarter.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions Refer to Note 4 of MidAmerican Energy's Notes to Financial Statements.
Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions In June 2017, Sierra Pacific amended its $250 million secured credit facility, extending the maturity date to June 2020 with two one-year extension options subject to lender consent. The amended credit facility, which is for general corporate purposes and provides for the issuance of letters of credit, has a variable interest rate based on the Eurodollar rate or a base rate, at Sierra Pacific's option, plus a spread that varies based on Sierra Pacific's credit ratings for its senior secured long-term debt securities. The amended credit facility requires Sierra Pacific's ratio of consolidated debt, including current maturities, to total capitalization not exceed 0.65 to 1.0 as of the last day of each quarter.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2017
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Income Taxes	Income Taxes 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: Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Federal statutory income tax rate 35 % 35 % 35 % 35 % Income tax credits (19 ) (16 ) (18 ) (15 ) State income tax, net of federal income tax benefit — — (1 ) — Income tax effect of foreign income (3 ) (3 ) (4 ) (4 ) Equity income 1 1 1 1 Other, net 1 (1 ) — — Effective income tax rate 15 % 16 % 13 % 17 % Income tax credits relate primarily to production tax credits from wind-powered generating facilities owned by MidAmerican Energy , PacifiCorp and BHE Renewables . Federal renewable electricity production tax credits are earned as energy from qualifying wind-powered generating facilities is produced and sold and are based on a per-kilowatt hour rate pursuant to the applicable federal income tax law. Wind-powered generating facilities are eligible for the credits for 10 years from the date the qualifying generating facilities are placed in-service. Berkshire Hathaway includes the Company in its United States federal income tax return. The Company's provision for income taxes has been computed on a stand-alone basis, and substantially all of its currently payable or receivable federal income taxes are remitted to or received from Berkshire Hathaway . For the nine-month periods ended September 30, 2017 and 2016 , the Company received net cash payments for federal income taxes from Berkshire Hathaway totaling $659 million and $860 million , respectively.
MidAmerican Energy Company [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Income Taxes	Income Taxes A reconciliation of the federal statutory income tax rate to MidAmerican Energy's effective income tax rate applicable to income before income tax benefit is as follows: Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Federal statutory income tax rate 35 % 35 % 35 % 35 % Income tax credits (74 ) (58 ) (74 ) (58 ) State income tax, net of federal income tax benefit (10 ) (6 ) (7 ) (4 ) Effects of ratemaking (2 ) (1 ) (4 ) (3 ) Other, net (1 ) — — — Effective income tax rate (52 )% (30 )% (50 )% (30 )% Income tax credits relate primarily to production tax credits from MidAmerican Energy's wind-powered generating facilities. Federal renewable electricity production tax credits are earned as energy from qualifying wind-powered generating facilities is produced and sold and are based on a per-kilowatt hour rate pursuant to the applicable federal income tax law. Wind-powered generating facilities are eligible for the credits for 10 years from the date the qualifying generating facilities are placed in-service. Berkshire Hathaway includes BHE and subsidiaries in its United States federal income tax return. Consistent with established regulatory practice, MidAmerican Energy's provision for income taxes has been computed on a stand-alone basis, and substantially all of its currently payable or receivable income taxes are remitted to or received from BHE . MidAmerican Energy received net cash payments for income taxes from BHE totaling $381 million and $416 million for the nine-month periods ended September 30, 2017 and 2016 , respectively.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Income Taxes	Income Taxes A reconciliation of the federal statutory income tax rate to MidAmerican Funding 's effective income tax rate applicable to income before income tax benefit is as follows: Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Federal statutory income tax rate 35 % 35 % 35 % 35 % Income tax credits (76 ) (60 ) (76 ) (61 ) State income tax, net of federal income tax benefit (10 ) (7 ) (8 ) (4 ) Effects of ratemaking (2 ) — (4 ) (3 ) Effective income tax rate (53 )% (32 )% (53 )% (33 )% Income tax credits relate primarily to production tax credits from MidAmerican Energy's wind-powered generating facilities. Federal renewable electricity production tax credits are earned as energy from qualifying wind-powered generating facilities is produced and sold and are based on a per-kilowatt hour rate pursuant to the applicable federal income tax law. Wind-powered generating facilities are eligible for the credits for 10 years from the date the qualifying generating facilities are placed in-service. Berkshire Hathaway includes BHE and subsidiaries in its United States federal income tax return. Consistent with established regulatory practice, MidAmerican Funding 's and MidAmerican Energy's provisions for income taxes have been computed on a stand-alone basis, and substantially all of their currently payable or receivable income taxes are remitted to or received from BHE . MidAmerican Funding received net cash payments for income taxes from BHE totaling $386 million and $422 million for the nine-month periods ended September 30, 2017 and 2016 , respectively.

Employee Benefit Plans

Employee Benefit Plans	9 Months Ended
	Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Employee Benefit Plans	Employee Benefit Plans Domestic Operations Net periodic benefit cost (credit) for the domestic pension and other postretirement benefit plans included the following components (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Pension: Service cost $ 6 $ 7 $ 18 $ 22 Interest cost 29 31 87 94 Expected return on plan assets (40 ) (39 ) (120 ) (120 ) Net amortization 7 12 22 36 Net periodic benefit cost $ 2 $ 11 $ 7 $ 32 Other postretirement: Service cost $ 3 $ 2 $ 7 $ 7 Interest cost 7 7 21 23 Expected return on plan assets (9 ) (10 ) (30 ) (31 ) Net amortization (3 ) (2 ) (10 ) (9 ) Net periodic benefit credit $ (2 ) $ (3 ) $ (12 ) $ (10 ) Employer contributions to the domestic pension and other postretirement benefit plans are expected to be $15 million and $5 million , respectively, during 2017 . As of September 30, 2017 , $9 million and $5 million of contributions had been made to the domestic pension and other postretirement benefit plans, respectively. Foreign Operations Net periodic benefit cost for the United Kingdom pension plan included the following components (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Service cost $ 6 $ 5 $ 19 $ 16 Interest cost 15 17 44 55 Expected return on plan assets (25 ) (27 ) (74 ) (85 ) Settlement 18 — 18 — Net amortization 17 11 50 34 Net periodic benefit cost $ 31 $ 6 $ 57 $ 20 Employer contributions to the United Kingdom pension plan are expected to be £45 million during 2017 . As of September 30, 2017 , £34 million , or $43 million , of contributions had been made to the United Kingdom pension plan.
PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Employee Benefit Plans	Employee Benefit Plans Net periodic benefit (credit) cost for the pension and other postretirement benefit plans included the following components (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Pension: Service cost $ — $ 1 $ — $ 3 Interest cost 12 14 37 41 Expected return on plan assets (18 ) (18 ) (54 ) (56 ) Net amortization 3 8 10 25 Net periodic benefit (credit) cost $ (3 ) $ 5 $ (7 ) $ 13 Other postretirement: Service cost $ 1 $ 1 $ 2 $ 2 Interest cost 3 3 10 11 Expected return on plan assets (5 ) (5 ) (16 ) (16 ) Net amortization (1 ) (1 ) (4 ) (4 ) Net periodic benefit credit $ (2 ) $ (2 ) $ (8 ) $ (7 ) Employer contributions to the pension and other postretirement benefit plans are expected to be $5 million and $- million, respectively, during 2017 . As of September 30, 2017 , $3 million and $- million of contributions had been made to the pension and other postretirement benefit plans, respectively.
MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Employee Benefit Plans	Employee Benefit Plans MidAmerican Energy sponsors a noncontributory defined benefit pension plan covering a majority of all employees of BHE and its domestic energy subsidiaries other than PacifiCorp and NV Energy, Inc. MidAmerican Energy also sponsors certain postretirement healthcare and life insurance benefits covering substantially all retired employees of BHE and its domestic energy subsidiaries other than PacifiCorp and NV Energy, Inc. Net periodic benefit (credit) cost for the plans of MidAmerican Energy and the aforementioned affiliates included the following components (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Pension: Service cost $ 2 $ 3 $ 7 $ 8 Interest cost 8 8 23 25 Expected return on plan assets (11 ) (11 ) (33 ) (33 ) Net amortization — — 1 1 Net periodic benefit (credit) cost $ (1 ) $ — $ (2 ) $ 1 Other postretirement: Service cost $ 2 $ 1 $ 4 $ 4 Interest cost 3 2 7 7 Expected return on plan assets (3 ) (3 ) (10 ) (10 ) Net amortization (1 ) (1 ) (3 ) (3 ) Net periodic benefit cost (credit) $ 1 $ (1 ) $ (2 ) $ (2 ) Employer contributions to the pension and other postretirement benefit plans are expected to be $8 million and $1 million , respectively, during 2017 . As of September 30, 2017 , $5 million and $1 million of contributions had been made to the pension and other postretirement benefit plans, respectively.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Defined Benefit Plan Disclosure [Line Items]
Employee Benefit Plans	Employee Benefit Plans Refer to Note 6 of MidAmerican Energy's Notes to Financial Statements.
Nevada Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Employee Benefit Plans	Employee Benefit Plans Nevada Power is a participant in benefit plans sponsored by NV Energy. The NV Energy Retirement Plan includes a qualified pension plan ("Qualified Pension Plan") and a supplemental executive retirement plan and a restoration plan (collectively, "Non‑Qualified Pension Plans") that provide pension benefits for eligible employees. The NV Energy Comprehensive Welfare Benefit and Cafeteria Plan provides certain postretirement health care and life insurance benefits for eligible retirees ("Other Postretirement Plans") on behalf of Nevada Power. Nevada Power contributed $1 million to the Non-Qualified Pension Plans for the nine-month period ended September 30, 2017 . Amounts attributable to Nevada Power were allocated from NV Energy based upon the current, or in the case of retirees, previous, employment location. Offsetting regulatory assets and liabilities have been recorded related to the amounts not yet recognized as a component of net periodic benefit costs that will be included in regulated rates. Net periodic benefit costs not included in regulated rates are included in accumulated other comprehensive loss, net. Amounts payable to NV Energy are included on the Consolidated Balance Sheets and consist of the following (in millions): As of September 30, December 31, 2017 2016 Qualified Pension Plan - Other long-term liabilities $ (27 ) $ (24 ) Non-Qualified Pension Plans: Other current liabilities (1 ) (1 ) Other long-term liabilities (9 ) (9 ) Other Postretirement Plans - Other long-term liabilities (4 ) (4 )
Sierra Pacific Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Employee Benefit Plans	Employee Benefit Plans Sierra Pacific is a participant in benefit plans sponsored by NV Energy. The NV Energy Retirement Plan includes a qualified pension plan ("Qualified Pension Plan") and a supplemental executive retirement plan and a restoration plan (collectively, "Non‑Qualified Pension Plans") that provide pension benefits for eligible employees. The NV Energy Comprehensive Welfare Benefit and Cafeteria Plan provides certain postretirement health care and life insurance benefits for eligible retirees ("Other Postretirement Plans") on behalf of Sierra Pacific. Sierra Pacific contributed $4 million to the Other Postretirement Plans for the nine-month period ended September 30, 2017 . Amounts attributable to Sierra Pacific were allocated from NV Energy based upon the current, or in the case of retirees, previous, employment location. Offsetting regulatory assets and liabilities have been recorded related to the amounts not yet recognized as a component of net periodic benefit costs that will be included in regulated rates. Net periodic benefit costs not included in regulated rates are included in accumulated other comprehensive loss, net. Amounts payable to NV Energy are included on the Consolidated Balance Sheets and consist of the following (in millions): As of September 30, December 31, 2017 2016 Qualified Pension Plan - Other long-term liabilities $ (13 ) $ (12 ) Non-Qualified Pension Plans: Other current liabilities (1 ) (1 ) Other long-term liabilities (9 ) (9 ) Other Postretirement Plans - Other long-term liabilities (25 ) (28 )

Risk Management and Hedging Act

Risk Management and Hedging Activities	9 Months Ended
	Sep. 30, 2017
Derivative [Line Items]
Risk Management and Hedging Activities	Risk Management and Hedging Activities The Company is exposed to the impact of market fluctuations in commodity prices, interest rates and foreign currency exchange rates. The Company is principally exposed to electricity, natural gas, coal and fuel oil commodity price risk primarily through BHE's ownership of PacifiCorp , MidAmerican Energy , Nevada Power and Sierra Pacific (the " Utilities ") as they have an obligation to serve retail customer load in their regulated service territories. The Company also provides nonregulated retail electricity and natural gas services in competitive markets. The Utilities ' load and generating facilities represent substantial underlying commodity positions. Exposures to commodity prices consist mainly of variations in the price of fuel required to generate electricity, wholesale electricity that is purchased and sold, and natural gas supply for retail customers. Commodity prices are subject to wide price swings as supply and demand are impacted by, among many other unpredictable items, weather, market liquidity, generating facility availability, customer usage, storage, and transmission and transportation constraints. Interest rate risk exists on variable-rate debt, future debt issuances and mortgage commitments. Additionally, the Company is exposed to foreign currency exchange rate risk from its business operations and investments in Great Britain and Canada. The Company does not engage in a material amount of proprietary trading activities. Each of the Company's business platforms has established a risk management process that is designed to identify, assess, manage, monitor and report each of the various types of risk involved in its business. To mitigate a portion of its commodity price risk, the Company uses commodity derivative contracts, which may include forwards, futures, options, swaps and other agreements, to effectively secure future supply or sell future production generally at fixed prices. The Company manages its interest rate risk by limiting its exposure to variable interest rates primarily through the issuance of fixed-rate long-term debt and by monitoring market changes in interest rates. Additionally, the Company may from time to time enter into interest rate derivative contracts, such as interest rate swaps or locks, forward sale commitments, or mortgage interest rate lock commitments, to mitigate the Company's exposure to interest rate risk. The Company does not hedge all of its commodity price, interest rate and foreign currency exchange rate risks, thereby exposing the unhedged portion to changes in market prices. There have been no significant changes in the Company's accounting policies related to derivatives. Refer to Note 10 for additional information on derivative contracts. The following table, which reflects master netting arrangements and excludes contracts that have been designated as normal under the normal purchases or normal sales exception afforded by GAAP, summarizes the fair value of the Company's derivative contracts, on a gross basis, and reconciles those amounts to the amounts presented on a net basis on the Consolidated Balance Sheets (in millions): Other Other Other Current Other Current Long-term Assets Assets Liabilities Liabilities Total As of September 30, 2017 Not designated as hedging contracts: Commodity assets (1) $ 16 $ 93 $ 7 $ 3 $ 119 Commodity liabilities (1) (1 ) — (60 ) (135 ) (196 ) Interest rate assets 22 — — — 22 Interest rate liabilities — — (3 ) (7 ) (10 ) Total 37 93 (56 ) (139 ) (65 ) Designated as hedging contracts: Commodity assets — — 2 6 8 Commodity liabilities — — (11 ) (17 ) (28 ) Interest rate assets — 6 — — 6 Interest rate liabilities — — (1 ) — (1 ) Total — 6 (10 ) (11 ) (15 ) Total derivatives 37 99 (66 ) (150 ) (80 ) Cash collateral receivable — — 21 64 85 Total derivatives - net basis $ 37 $ 99 $ (45 ) $ (86 ) $ 5 Other Other Other Current Other Current Long-term Assets Assets Liabilities Liabilities Total As of December 31, 2016 Not designated as hedging contracts: Commodity assets (1) $ 42 $ 86 $ 5 $ 2 $ 135 Commodity liabilities (1) (10 ) — (46 ) (150 ) (206 ) Interest rate assets 15 — — — 15 Interest rate liabilities — — (4 ) (6 ) (10 ) Total 47 86 (45 ) (154 ) (66 ) Designated as hedging contracts: Commodity assets 1 — 2 3 6 Commodity liabilities — — (14 ) (8 ) (22 ) Interest rate assets — 8 — — 8 Interest rate liabilities — — (3 ) — (3 ) Total 1 8 (15 ) (5 ) (11 ) Total derivatives 48 94 (60 ) (159 ) (77 ) Cash collateral receivable — — 13 61 74 Total derivatives - net basis $ 48 $ 94 $ (47 ) $ (98 ) $ (3 ) (1) The Company's commodity derivatives not designated as hedging contracts are generally included in regulated rates, and as of September 30, 2017 and December 31, 2016 , a net regulatory asset of $162 million and $148 million , respectively, was recorded related to the net derivative liability of $77 million and $71 million , respectively. The difference between the net regulatory asset and the net derivative liability relates primarily to a power purchase agreement derivative at BHE Renewables . Not Designated as Hedging Contracts The following table reconciles the beginning and ending balances of the Company's net regulatory assets and summarizes the pre-tax gains and losses on commodity derivative contracts recognized in net regulatory assets, as well as amounts reclassified to earnings (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Beginning balance $ 162 $ 185 $ 148 $ 250 Changes in fair value recognized in net regulatory assets 10 18 43 5 Net (losses) gains reclassified to operating revenue (5 ) (3 ) 9 (6 ) Net losses reclassified to cost of sales (5 ) (5 ) (38 ) (54 ) Ending balance $ 162 $ 195 $ 162 $ 195 Designated as Hedging Contracts The Company uses commodity derivative contracts accounted for as cash flow hedges to hedge electricity and natural gas commodity prices for delivery to nonregulated customers, spring operational sales, natural gas storage and other transactions. Certain commodity derivative contracts have settled and the fair value at the date of settlement remains in AOCI and is recognized in earnings when the forecasted transactions impact earnings. The following table reconciles the beginning and ending balances of the Company's accumulated other comprehensive (income) loss (pre-tax) and summarizes pre-tax gains and losses on commodity derivative contracts designated and qualifying as cash flow hedges recognized in OCI, as well as amounts reclassified to earnings (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Beginning balance $ 21 $ 26 $ 16 $ 46 Changes in fair value recognized in OCI 5 15 28 35 Net gains reclassified to operating revenue — 1 — 1 Net losses reclassified to cost of sales (7 ) (7 ) (25 ) (47 ) Ending balance $ 19 $ 35 $ 19 $ 35 Realized gains and losses on hedges and hedge ineffectiveness are recognized in income as operating revenue, cost of sales, operating expense or interest expense depending upon the nature of the item being hedged. For the three- and nine-month periods ended September 30, 2017 and 2016 , hedge ineffectiveness was insignificant. As of September 30, 2017 , the Company had cash flow hedges with expiration dates extending through June 2026 and $10 million of pre-tax unrealized losses are forecasted to be reclassified from AOCI into earnings over the next twelve months as contracts settle. Derivative Contract Volumes The following table summarizes the net notional amounts of outstanding derivative contracts with fixed price terms that comprise the mark-to-market values as of (in millions): Unit of September 30, December 31, Measure 2017 2016 Electricity purchases Megawatt hours 9 5 Natural gas purchases Decatherms 339 271 Fuel purchases Gallons 2 11 Interest rate swaps US$ 694 714 Interest rate swaps £ 102 — Mortgage sale commitments, net US$ (442 ) (309 ) Credit Risk The Utilities are exposed to counterparty credit risk associated with wholesale energy supply and marketing activities with other utilities, energy marketing companies, financial institutions and other market participants. Credit risk may be concentrated to the extent the Utilities ' counterparties have similar economic, industry or other characteristics and due to direct or indirect relationships among the counterparties. Before entering into a transaction, the Utilities analyze the financial condition of each significant wholesale counterparty, establish limits on the amount of unsecured credit to be extended to each counterparty and evaluate the appropriateness of unsecured credit limits on an ongoing basis. To further mitigate wholesale counterparty credit risk, the Utilities enter into netting and collateral arrangements that may include margining and cross-product netting agreements and obtain third-party guarantees, letters of credit and cash deposits. If required, the Utilities exercise rights under these arrangements, including calling on the counterparty's credit support arrangement. Collateral and Contingent Features In accordance with industry practice, certain wholesale derivative contracts contain credit support provisions that in part base certain collateral requirements on credit ratings for senior unsecured debt as reported by one or more of the three recognized credit rating agencies. These derivative contracts may either specifically provide bilateral rights to demand cash or other security if credit exposures on a net basis exceed specified rating-dependent threshold levels ("credit-risk-related contingent features") or provide the right for counterparties to demand "adequate assurance," or in some cases terminate the contract, in the event of a material adverse change in creditworthiness. These rights can vary by contract and by counterparty. As of September 30, 2017 , the applicable credit ratings from the three recognized credit rating agencies were investment grade. The aggregate fair value of the Company's derivative contracts in liability positions with specific credit-risk-related contingent features totaled $190 million and $190 million as of September 30, 2017 and December 31, 2016 , respectively, for which the Company had posted collateral of $73 million and $69 million , respectively, in the form of cash deposits. If all credit-risk-related contingent features for derivative contracts in liability positions had been triggered as of September 30, 2017 and December 31, 2016 , the Company would have been required to post $105 million and $110 million , respectively, of additional collateral. The Company's collateral requirements could fluctuate considerably due to market price volatility, changes in credit ratings, changes in legislation or regulation, or other factors.
PacifiCorp [Member]
Derivative [Line Items]
Risk Management and Hedging Activities	Risk Management and Hedging Activities PacifiCorp is exposed to the impact of market fluctuations in commodity prices and interest rates. PacifiCorp is principally exposed to electricity, natural gas, coal and fuel oil commodity price risk as it has an obligation to serve retail customer load in its regulated service territories. PacifiCorp's load and generating facilities represent substantial underlying commodity positions. Exposures to commodity prices consist mainly of variations in the price of fuel required to generate electricity and wholesale electricity that is purchased and sold. Commodity prices are subject to wide price swings as supply and demand are impacted by, among many other unpredictable items, weather, market liquidity, generating facility availability, customer usage, storage, and transmission and transportation constraints. Interest rate risk exists on variable-rate debt and future debt issuances. PacifiCorp does not engage in a material amount of proprietary trading activities. PacifiCorp has established a risk management process that is designed to identify, assess, manage, monitor and report each of the various types of risk involved in its business. To mitigate a portion of its commodity price risk, PacifiCorp uses commodity derivative contracts, which may include forwards, options, swaps and other agreements, to effectively secure future supply or sell future production generally at fixed prices. PacifiCorp manages its interest rate risk by limiting its exposure to variable interest rates primarily through the issuance of fixed-rate long-term debt and by monitoring market changes in interest rates. Additionally, PacifiCorp may from time to time enter into interest rate derivative contracts, such as interest rate swaps or locks, to mitigate PacifiCorp's exposure to interest rate risk. No interest rate derivatives were in place during the periods presented. PacifiCorp does not hedge all of its commodity price and interest rate risks, thereby exposing the unhedged portion to changes in market prices. There have been no significant changes in PacifiCorp's accounting policies related to derivatives. Refer to Note 7 for additional information on derivative contracts. The following table, which reflects master netting arrangements and excludes contracts that have been designated as normal under the normal purchases or normal sales exception afforded by GAAP, summarizes the fair value of PacifiCorp's derivative contracts, on a gross basis, and reconciles those amounts to the amounts presented on a net basis on the Consolidated Balance Sheets (in millions): Other Other Other Current Other Current Long-term Assets Assets Liabilities Liabilities Total As of September 30, 2017 Not designated as hedging contracts (1) : Commodity assets $ 4 $ 1 $ 2 $ — $ 7 Commodity liabilities (1 ) — (24 ) (82 ) (107 ) Total 3 1 (22 ) (82 ) (100 ) Total derivatives 3 1 (22 ) (82 ) (100 ) Cash collateral receivable — — 16 57 73 Total derivatives - net basis $ 3 $ 1 $ (6 ) $ (25 ) $ (27 ) As of December 31, 2016 Not designated as hedging contracts (1) : Commodity assets $ 24 $ 2 $ 1 $ — $ 27 Commodity liabilities (6 ) — (14 ) (84 ) (104 ) Total 18 2 (13 ) (84 ) (77 ) Total derivatives 18 2 (13 ) (84 ) (77 ) Cash collateral receivable — — 10 59 69 Total derivatives - net basis $ 18 $ 2 $ (3 ) $ (25 ) $ (8 ) (1) PacifiCorp's commodity derivatives are generally included in rates and as of September 30, 2017 and December 31, 2016 , a regulatory asset of $97 million and $73 million , respectively, was recorded related to the net derivative liability of $100 million and $77 million , respectively. Not Designated as Hedging Contracts The following table reconciles the beginning and ending balances of PacifiCorp's net regulatory assets and summarizes the pre-tax gains and losses on commodity derivative contracts recognized in net regulatory assets, as well as amounts reclassified to earnings (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Beginning balance $ 95 $ 89 $ 73 $ 133 Changes in fair value recognized in net regulatory assets 6 15 36 (4 ) Net (losses) gains reclassified to operating revenue (5 ) (2 ) 8 8 Net gains (losses) reclassified to energy costs 1 — (20 ) (35 ) Ending balance $ 97 $ 102 $ 97 $ 102 Derivative Contract Volumes The following table summarizes the net notional amounts of outstanding commodity derivative contracts with fixed price terms that comprise the mark-to-market values as of (in millions): Unit of September 30, December 31, Measure 2017 2016 Electricity sales Megawatt hours (3 ) (3 ) Natural gas purchases Decatherms 97 84 Fuel oil purchases Gallons 2 11 Credit Risk PacifiCorp is exposed to counterparty credit risk associated with wholesale energy supply and marketing activities with other utilities, energy marketing companies, financial institutions and other market participants. Credit risk may be concentrated to the extent PacifiCorp's counterparties have similar economic, industry or other characteristics and due to direct or indirect relationships among the counterparties. Before entering into a transaction, PacifiCorp analyzes the financial condition of each significant wholesale counterparty, establishes limits on the amount of unsecured credit to be extended to each counterparty and evaluates the appropriateness of unsecured credit limits on an ongoing basis. To further mitigate wholesale counterparty credit risk, PacifiCorp enters into netting and collateral arrangements that may include margining and cross-product netting agreements and obtains third-party guarantees, letters of credit and cash deposits. If required, PacifiCorp exercises rights under these arrangements, including calling on the counterparty's credit support arrangement. Collateral and Contingent Features In accordance with industry practice, certain wholesale derivative contracts contain credit support provisions that in part base certain collateral requirements on credit ratings for senior unsecured debt as reported by one or more of the three recognized credit rating agencies. These derivative contracts may either specifically provide bilateral rights to demand cash or other security if credit exposures on a net basis exceed specified rating-dependent threshold levels ("credit-risk-related contingent features") or provide the right for counterparties to demand "adequate assurance," or in some cases terminate the contract, in the event of a material adverse change in PacifiCorp's creditworthiness. These rights can vary by contract and by counterparty. As of September 30, 2017 , PacifiCorp's credit ratings from the three recognized credit rating agencies were investment grade. The aggregate fair value of PacifiCorp's derivative contracts in liability positions with specific credit-risk-related contingent features totaled $102 million and $97 million as of September 30, 2017 and December 31, 2016 , respectively, for which PacifiCorp had posted collateral of $73 million and $69 million , respectively, in the form of cash deposits. If all credit-risk-related contingent features for derivative contracts in liability positions had been triggered as of September 30, 2017 and December 31, 2016 , PacifiCorp would have been required to post $26 million and $22 million , respectively, of additional collateral. PacifiCorp's collateral requirements could fluctuate considerably due to market price volatility, changes in credit ratings, changes in legislation or regulation, or other factors.
Nevada Power Company [Member]
Derivative [Line Items]
Risk Management and Hedging Activities	Risk Management and Hedging Activities Nevada Power is exposed to the impact of market fluctuations in commodity prices and interest rates. Nevada Power is principally exposed to electricity, natural gas and coal market fluctuations primarily through Nevada Power's obligation to serve retail customer load in its regulated service territory. Nevada Power's load and generating facilities represent substantial underlying commodity positions. Exposures to commodity prices consist mainly of variations in the price of fuel required to generate electricity and wholesale electricity that is purchased and sold. Commodity prices are subject to wide price swings as supply and demand are impacted by, among many other unpredictable items, weather, market liquidity, generating facility availability, customer usage, storage, and transmission and transportation constraints. The actual cost of fuel and purchased power is recoverable through the deferred energy mechanism. Interest rate risk exists on variable-rate debt and future debt issuances. Nevada Power does not engage in proprietary trading activities. Nevada Power has established a risk management process that is designed to identify, assess, manage, monitor and report each of the various types of risk involved in its business. To mitigate a portion of its commodity price risk, Nevada Power uses commodity derivative contracts, which may include forwards, futures, options, swaps and other agreements, to effectively secure future supply or sell future production generally at fixed prices. Nevada Power manages its interest rate risk by limiting its exposure to variable interest rates primarily through the issuance of fixed-rate long-term debt and by monitoring market changes in interest rates. Additionally, Nevada Power may from time to time enter into interest rate derivative contracts, such as interest rate swaps or locks, to mitigate Nevada Power's exposure to interest rate risk. Nevada Power does not hedge all of its commodity price and interest rate risks, thereby exposing the unhedged portion to changes in market prices. There have been no significant changes in Nevada Power's accounting policies related to derivatives. Refer to Note 8 for additional information on derivative contracts. The following table, which excludes contracts that have been designated as normal under the normal purchases or normal sales exception afforded by GAAP, summarizes the fair value of Nevada Power's derivative contracts, on a gross basis, and reconciles those amounts to the amounts presented on a net basis on the Consolidated Balance Sheets (in millions): Other Other Current Long-term Liabilities Liabilities Total As of September 30, 2017 Commodity liabilities (1) $ (3 ) $ (1 ) $ (4 ) As of December 31, 2016 Commodity liabilities (1) $ (7 ) $ (7 ) $ (14 ) (1) Nevada Power's commodity derivatives not designated as hedging contracts are included in regulated rates and as of September 30, 2017 and December 31, 2016 , a regulatory asset of $4 million and $14 million , respectively, was recorded related to the derivative liability of $4 million and $14 million , respectively. Derivative Contract Volumes The following table summarizes the net notional amounts of outstanding derivative contracts with indexed and fixed price terms that comprise the mark-to-market values (in millions): As of Unit of September 30, December 31, Measure 2017 2016 Electricity sales Megawatt hours — (2 ) Natural gas purchases Decatherms 149 114 Credit Risk Nevada Power is exposed to counterparty credit risk associated with wholesale energy supply and marketing activities with other utilities, energy marketing companies, financial institutions and other market participants. Credit risk may be concentrated to the extent Nevada Power's counterparties have similar economic, industry or other characteristics and due to direct and indirect relationships among the counterparties. Before entering into a transaction, Nevada Power analyzes the financial condition of each significant wholesale counterparty, establish limits on the amount of unsecured credit to be extended to each counterparty and evaluate the appropriateness of unsecured credit limits on an ongoing basis. To further mitigate wholesale counterparty credit risk, Nevada Power enters into netting and collateral arrangements that may include margining and cross-product netting agreements and obtain third-party guarantees, letters of credit and cash deposits. If required, Nevada Power exercises rights under these arrangements, including calling on the counterparty's credit support arrangement. Collateral and Contingent Features In accordance with industry practice, certain wholesale derivative contracts contain credit support provisions that in part base certain collateral requirements on credit ratings for unsecured debt as reported by one or more of the three recognized credit rating agencies. These derivative contracts may either specifically provide rights to demand cash or other security in the event of a credit rating downgrade ("credit-risk-related contingent features") or provide the right for counterparties to demand "adequate assurance," in the event of a material adverse change in creditworthiness. These rights can vary by contract and by counterparty. As of September 30, 2017 , credit ratings from the three recognized credit rating agencies were investment grade. The aggregate fair value of Nevada Power's derivative contracts in liability positions with specific credit-risk-related contingent features was $2 million as of September 30, 2017 and December 31, 2016 , which represents the amount of collateral to be posted if all credit risk related contingent features for derivative contracts in liability positions had been triggered. Nevada Power's collateral requirements could fluctuate considerably due to market price volatility, changes in credit ratings, changes in legislation or regulation or other factors.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements	Fair Value Measurements The carrying value of the Company's cash, certain cash equivalents, receivables, payables, accrued liabilities and short-term borrowings approximates fair value because of the short-term maturity of these instruments. The Company has various financial assets and liabilities that are measured at fair value on the Consolidated Financial Statements using inputs from the three levels of the fair value hierarchy. A financial asset or liability classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. The three levels are as follows: • Level 1 — Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date. • Level 2 — Inputs include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market corroborated inputs). • Level 3 — Unobservable inputs reflect the Company's judgments about the assumptions market participants would use in pricing the asset or liability since limited market data exists. The Company develops these inputs based on the best information available, including its own data. The following table presents the Company's financial 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 September 30, 2017 Assets: Commodity derivatives $ 1 $ 24 $ 102 $ (19 ) $ 108 Interest rate derivatives — 14 14 — 28 Mortgage loans held for sale — 534 — — 534 Money market mutual funds (2) 855 — — — 855 Debt securities: United States government obligations 168 — — — 168 International government obligations — 5 — — 5 Corporate obligations — 37 — — 37 Municipal obligations — 2 — — 2 Agency, asset and mortgage-backed obligations — 1 — — 1 Equity securities: United States companies 270 — — — 270 International companies 2,094 — — — 2,094 Investment funds 182 — — — 182 $ 3,570 $ 617 $ 116 $ (19 ) $ 4,284 Liabilities: Commodity derivatives $ (1 ) $ (207 ) $ (16 ) $ 104 $ (120 ) Interest rate derivatives — (10 ) (1 ) — (11 ) $ (1 ) $ (217 ) $ (17 ) $ 104 $ (131 ) As of December 31, 2016 Assets: Commodity derivatives $ 5 $ 49 $ 87 $ (22 ) $ 119 Interest rate derivatives — 16 7 — 23 Mortgage loans held for sale — 359 — — 359 Money market mutual funds (2) 586 — — — 586 Debt securities: United States government obligations 161 — — — 161 International government obligations — 3 — — 3 Corporate obligations — 36 — — 36 Municipal obligations — 2 — — 2 Agency, asset and mortgage-backed obligations — 2 — — 2 Equity securities: United States companies 250 — — — 250 International companies 1,190 — — — 1,190 Investment funds 147 — — — 147 $ 2,339 $ 467 $ 94 $ (22 ) $ 2,878 Liabilities: Commodity derivatives $ (2 ) $ (199 ) $ (27 ) $ 96 $ (132 ) Interest rate derivatives (1 ) (11 ) (1 ) — (13 ) $ (3 ) $ (210 ) $ (28 ) $ 96 $ (145 ) (1) Represents netting under master netting arrangements and a net cash collateral receivable of $85 million and $74 million as of September 30, 2017 and December 31, 2016 , 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. Derivative contracts are recorded on the Consolidated Balance Sheets as either assets or liabilities and are stated at estimated fair value unless they are designated as normal purchases or normal sales and qualify for the exception afforded by GAAP. When available, the fair value of derivative contracts is estimated using unadjusted quoted prices for identical contracts in the market in which the Company transacts. When quoted prices for identical contracts are not available, the Company uses forward price curves. Forward price curves represent the Company's estimates of the prices at which a buyer or seller could contract today for delivery or settlement at future dates. The Company bases its forward price curves upon market price quotations, when available, or internally developed and commercial models, with internal and external fundamental data inputs. Market price quotations are obtained from independent brokers, exchanges, direct communication with market participants and actual transactions executed by the Company. Market price quotations are generally readily obtainable for the applicable term of the Company's outstanding derivative contracts; therefore, the Company's forward price curves reflect observable market quotes. Market price quotations for certain electricity and natural gas trading hubs are not as readily obtainable due to the length of the contract. Given that limited market data exists for these contracts, as well as for those contracts that are not actively traded, the Company uses forward price curves derived from internal models based on perceived pricing relationships to major trading hubs that are based on unobservable inputs. The estimated fair value of these derivative contracts is a function of underlying forward commodity prices, interest rates, currency rates, related volatility, counterparty creditworthiness and duration of contracts. Refer to Note 9 for further discussion regarding the Company's risk management and hedging activities. The Company's mortgage loans held for sale are valued based on independent quoted market prices, where available, or the prices of other mortgage whole loans with similar characteristics. As necessary, these prices are adjusted for typical securitization activities, including servicing value, portfolio composition, market conditions and liquidity. The Company's investments in money market mutual funds and debt and equity securities are stated at fair value and are primarily accounted for as available-for-sale securities. When available, a readily observable quoted market price or net asset value of an identical security in an active market is used to record the fair value. In the absence of a quoted market price or net asset value of an identical security, the fair value is determined using pricing models or net asset values based on observable market inputs and quoted market prices of securities with similar characteristics. The following table reconciles the beginning and ending balances of the Company's assets and liabilities measured at fair value on a recurring basis using significant Level 3 inputs (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, Interest Auction Interest Auction Commodity Rate Rate Commodity Rate Rate Derivatives Derivatives Securities Derivatives Derivatives Securities 2017: Beginning balance $ 81 $ 8 $ — $ 60 $ 6 $ — Changes included in earnings 7 34 — 19 100 — Changes in fair value recognized in OCI (1 ) — — (3 ) — — Changes in fair value recognized in net regulatory assets (3 ) — — (5 ) — — Purchases — 8 — 1 6 — Settlements 2 (37 ) — 14 (99 ) — Ending balance $ 86 $ 13 $ — $ 86 $ 13 $ — Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, Interest Auction Interest Auction Commodity Rate Rate Commodity Rate Rate Derivatives Derivatives Securities Derivatives Derivatives Securities 2016: Beginning balance $ 44 $ 14 $ 18 $ 47 $ 4 $ 44 Changes included in earnings 9 49 — 8 103 — Changes in fair value recognized in OCI (2 ) — — (2 ) — 6 Changes in fair value recognized in net regulatory assets (1 ) — — (12 ) — — Purchases 1 — — 1 — — Redemptions — — — — — (32 ) Settlements 5 (52 ) — 14 (96 ) — Ending balance $ 56 $ 11 $ 18 $ 56 $ 11 $ 18 The Company's long-term debt is carried at cost on the Consolidated Balance Sheets. The fair value of the Company's long-term debt is a Level 2 fair value measurement and has been estimated based upon quoted market prices, where available, or at the present value of future cash flows discounted at rates consistent with comparable maturities with similar credit risks. The carrying value of the Company's variable-rate long-term debt approximates fair value because of the frequent repricing of these instruments at market rates. The following table presents the carrying value and estimated fair value of the Company's long-term debt (in millions): As of September 30, 2017 As of December 31, 2016 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 36,124 $ 41,197 $ 36,116 $ 40,718
PacifiCorp [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements	Fair Value Measurements The carrying value of PacifiCorp's cash, certain cash equivalents, receivables, payables, accrued liabilities and short-term borrowings approximates fair value because of the short-term maturity of these instruments. PacifiCorp has various financial assets and liabilities that are measured at fair value on the Consolidated Financial Statements using inputs from the three levels of the fair value hierarchy. A financial asset or liability classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. The three levels are as follows: • Level 1 — Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that PacifiCorp has the ability to access at the measurement date. • Level 2 — Inputs include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market corroborated inputs). • Level 3 — Unobservable inputs reflect PacifiCorp's judgments about the assumptions market participants would use in pricing the asset or liability since limited market data exists. PacifiCorp develops these inputs based on the best information available, including its own data. The following table presents PacifiCorp's financial 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 September 30, 2017 Assets: Commodity derivatives $ — $ 7 $ — $ (3 ) $ 4 Money market mutual funds (2) 100 — — — 100 Investment funds 20 — — — 20 $ 120 $ 7 $ — $ (3 ) $ 124 Liabilities - Commodity derivatives $ — $ (107 ) $ — $ 76 $ (31 ) As of December 31, 2016 Assets: Commodity derivatives $ — $ 27 $ — $ (7 ) $ 20 Money market mutual funds (2) 13 — — — 13 Investment funds 17 — — — 17 $ 30 $ 27 $ — $ (7 ) $ 50 Liabilities - Commodity derivatives $ — $ (104 ) $ — $ 76 $ (28 ) (1) Represents netting under master netting arrangements and a net cash collateral receivable of $73 million and $69 million as of September 30, 2017 and December 31, 2016 , 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. Derivative contracts are recorded on the Consolidated Balance Sheets as either assets or liabilities and are stated at estimated fair value unless they are designated as normal purchases or normal sales and qualify for the exception afforded by GAAP. When available, the fair value of derivative contracts is estimated using unadjusted quoted prices for identical contracts in the market in which PacifiCorp transacts. When quoted prices for identical contracts are not available, PacifiCorp uses forward price curves. Forward price curves represent PacifiCorp's estimates of the prices at which a buyer or seller could contract today for delivery or settlement at future dates. PacifiCorp bases its forward price curves upon market price quotations, when available, or internally developed and commercial models, with internal and external fundamental data inputs. Market price quotations are obtained from independent energy brokers, exchanges, direct communication with market participants and actual transactions executed by PacifiCorp. Market price quotations for certain major electricity and natural gas trading hubs are generally readily obtainable for the first six years; therefore, PacifiCorp's forward price curves for those locations and periods reflect observable market quotes. Market price quotations for other electricity and natural gas trading hubs are not as readily obtainable for the first six years. Given that limited market data exists for these contracts, as well as for those contracts that are not actively traded, PacifiCorp uses forward price curves derived from internal models based on perceived pricing relationships to major trading hubs that are based on unobservable inputs. The estimated fair value of these derivative contracts is a function of underlying forward commodity prices, interest rates, currency rates, related volatility, counterparty creditworthiness and duration of contracts. Refer to Note 6 for further discussion regarding PacifiCorp's risk management and hedging activities. PacifiCorp's investments in money market mutual funds and investment funds are stated at fair value and are primarily accounted for as available-for-sale securities. When available, PacifiCorp uses a readily observable quoted market price or net asset value of an identical security in an active market to record the fair value. In the absence of a quoted market price or net asset value of an identical security, the fair value is determined using pricing models or net asset values based on observable market inputs and quoted market prices of securities with similar characteristics. PacifiCorp's long-term debt is carried at cost on the Consolidated Balance Sheets. The fair value of PacifiCorp's long-term debt is a Level 2 fair value measurement and has been estimated based upon quoted market prices, where available, or at the present value of future cash flows discounted at rates consistent with comparable maturities with similar credit risks. The carrying value of PacifiCorp's variable-rate long-term debt approximates fair value because of the frequent repricing of these instruments at market rates. The following table presents the carrying value and estimated fair value of PacifiCorp's long-term debt (in millions): As of September 30, 2017 As of December 31, 2016 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 7,005 $ 8,277 $ 7,052 $ 8,204
MidAmerican Energy Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements	Fair Value Measurements The carrying value of MidAmerican Energy's cash, certain cash equivalents, receivables, payables, accrued liabilities and short-term borrowings approximates fair value because of the short-term maturity of these instruments. MidAmerican Energy has various financial assets and liabilities that are measured at fair value on the Financial Statements using inputs from the three levels of the fair value hierarchy. A financial asset or liability classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. The three levels are as follows: • Level 1 — Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that MidAmerican Energy has the ability to access at the measurement date. • Level 2 — Inputs include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market corroborated inputs). • Level 3 — Unobservable inputs reflect MidAmerican Energy's judgments about the assumptions market participants would use in pricing the asset or liability since limited market data exists. MidAmerican Energy develops these inputs based on the best information available, including its own data. The following table presents MidAmerican Energy's financial 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 September 30, 2017: Assets: Commodity derivatives $ — $ 2 $ 2 $ (2 ) $ 2 Money market mutual funds (2) 520 — — — 520 Debt securities: United States government obligations 168 — — — 168 International government obligations — 5 — — 5 Corporate obligations — 37 — — 37 Municipal obligations — 2 — — 2 Agency, asset and mortgage-backed obligations — 1 — — 1 Equity securities: United States companies 270 — — — 270 International companies 7 — — — 7 Investment funds 15 — — — 15 $ 980 $ 47 $ 2 $ (2 ) $ 1,027 Liabilities - commodity derivatives $ — $ (6 ) $ (4 ) $ 2 $ (8 ) Input Levels for Fair Value Measurements Level 1 Level 2 Level 3 Other (1) Total As of December 31, 2016: Assets: Commodity derivatives $ — $ 9 $ 1 $ (2 ) $ 8 Money market mutual funds (2) 1 — — — 1 Debt securities: United States government obligations 161 — — — 161 International government obligations — 3 — — 3 Corporate obligations — 36 — — 36 Municipal obligations — 2 — — 2 Agency, asset and mortgage-backed obligations — 2 — — 2 Equity securities: United States companies 250 — — — 250 International companies 5 — — — 5 Investment funds 9 — — — 9 $ 426 $ 52 $ 1 $ (2 ) $ 477 Liabilities - commodity derivatives $ — $ (3 ) $ (3 ) $ 3 $ (3 ) (1) Represents netting under master netting arrangements and a net cash collateral receivable of $- million and $1 million as of September 30, 2017 and December 31, 2016 , respectively. (2) Amounts are included in cash and cash equivalents and investments and restricted cash and investments on the Balance Sheets. The fair value of these money market mutual funds approximates cost. Derivative contracts are recorded on the Balance Sheets as either assets or liabilities and are stated at estimated fair value unless they are designated as normal purchases or normal sales and qualify for the exception afforded by GAAP. When available, the fair value of derivative contracts is estimated using unadjusted quoted prices for identical contracts in the market in which MidAmerican Energy transacts. When quoted prices for identical contracts are not available, MidAmerican Energy uses forward price curves. Forward price curves represent MidAmerican Energy's estimates of the prices at which a buyer or seller could contract today for delivery or settlement at future dates. MidAmerican Energy bases its forward price curves upon market price quotations, when available, or internally developed and commercial models, with internal and external fundamental data inputs. Market price quotations are obtained from independent brokers, exchanges, direct communication with market participants and actual transactions executed by MidAmerican Energy. Market price quotations are generally readily obtainable for the applicable term of MidAmerican Energy's outstanding derivative contracts; therefore, MidAmerican Energy's forward price curves reflect observable market quotes. Market price quotations for certain electricity and natural gas trading hubs are not as readily obtainable due to the length of the contract. Given that limited market data exists for these contracts, as well as for those contracts that are not actively traded, MidAmerican Energy uses forward price curves derived from internal models based on perceived pricing relationships to major trading hubs that are based on unobservable inputs. The estimated fair value of these derivative contracts is a function of underlying forward commodity prices, interest rates, related volatility, counterparty creditworthiness and duration of contracts. MidAmerican Energy's investments in money market mutual funds and debt and equity securities are stated at fair value and are primarily accounted for as available-for-sale securities. When available, a readily observable quoted market price or net asset value of an identical security in an active market is used to record the fair value. In the absence of a quoted market price or net asset value of an identical security, the fair value is determined using pricing models or net asset values based on observable market inputs and quoted market prices of securities with similar characteristics. The following table reconciles the beginning and ending balances of MidAmerican Energy's assets and liabilities measured at fair value on a recurring basis using significant Level 3 inputs (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, Commodity Derivatives Auction Rate Securities Commodity Derivatives Auction Rate Securities 2017: Beginning balance $ (1 ) $ — $ (2 ) $ — Changes in fair value recognized in net regulatory assets (2 ) — (2 ) — Settlements 1 — 2 — Ending balance $ (2 ) $ — $ (2 ) $ — 2016: Beginning balance $ (2 ) $ 18 $ (6 ) $ 26 Transfer to affiliate — — (4 ) — Changes in fair value recognized in OCI — — — 3 Changes in fair value recognized in net regulatory assets (1 ) — (5 ) — Redemptions — — — (11 ) Settlements 1 — 13 — Ending balance $ (2 ) $ 18 $ (2 ) $ 18 MidAmerican Energy's long-term debt is carried at cost on the Balance Sheets. The fair value of MidAmerican Energy's long-term debt is a Level 2 fair value measurement and has been estimated based upon quoted market prices, where available, or at the present value of future cash flows discounted at rates consistent with comparable maturities with similar credit risks. The carrying value of MidAmerican Energy's variable-rate long-term debt approximates fair value because of the frequent repricing of these instruments at market rates. The following table presents the carrying value and estimated fair value of MidAmerican Energy's long-term debt (in millions): As of September 30, 2017 As of December 31, 2016 Carrying Value Fair Value Carrying Value Fair Value Long-term debt $ 4,894 $ 5,446 $ 4,301 $ 4,735
MidAmerican Funding, LLC and Subsidiaries [Domain]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements	Fair Value Measurements Refer to Note 7 of MidAmerican Energy's Notes to Financial Statements. MidAmerican Funding 's long-term debt is carried at cost on the Consolidated Financial Statements. The fair value of MidAmerican Funding 's long-term debt is a Level 2 fair value measurement and has been estimated based upon quoted market prices, where available, or at the present value of future cash flows discounted at rates consistent with comparable maturities with similar credit risks. The carrying value of MidAmerican Funding 's variable-rate long-term debt approximates fair value because of the frequent repricing of these instruments at market rates. The following table presents the carrying value and estimated fair value of MidAmerican Funding 's long-term debt (in millions): As of September 30, 2017 As of December 31, 2016 Carrying Value Fair Value Carrying Value Fair Value Long-term debt $ 5,220 $ 5,873 $ 4,627 $ 5,164
Nevada Power Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements	Fair Value Measurements The carrying value of Nevada Power's cash, certain cash equivalents, receivables, payables, accrued liabilities and short-term borrowings approximates fair value because of the short-term maturity of these instruments. Nevada Power has various financial assets and liabilities that are measured at fair value on the Consolidated Balance Sheets using inputs from the three levels of the fair value hierarchy. A financial asset or liability classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. The three levels are as follows: • Level 1 — Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that Nevada Power has the ability to access at the measurement date. • Level 2 — Inputs include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market corroborated inputs). • Level 3 — Unobservable inputs reflect Nevada Power's judgments about the assumptions market participants would use in pricing the asset or liability since limited market data exists. Nevada Power develops these inputs based on the best information available, including its own data. The following table presents Nevada Power's financial 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 Total As of September 30, 2017 Assets - investment funds $ 2 $ — $ — $ 2 Liabilities - commodity derivatives $ — $ — $ (4 ) $ (4 ) As of December 31, 2016 Assets: Money market mutual funds (1) $ 220 $ — $ — $ 220 Investment funds 6 — — 6 $ 226 $ — $ — $ 226 Liabilities - commodity derivatives $ — $ — $ (14 ) $ (14 ) (1) Amounts are included in cash and cash equivalents on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost. Derivative contracts are recorded on the Consolidated Balance Sheets as either assets or liabilities and are stated at estimated fair value unless they are designated as normal purchases or normal sales and qualify for the exception afforded by GAAP. When available, the fair value of derivative contracts is estimated using unadjusted quoted prices for identical contracts in the market in which Nevada Power transacts. When quoted prices for identical contracts are not available, Nevada Power uses forward price curves. Forward price curves represent Nevada Power's estimates of the prices at which a buyer or seller could contract today for delivery or settlement at future dates. Nevada Power bases its forward price curves upon internally developed models, with internal and external fundamental data inputs. Market price quotations for certain electricity and natural gas trading hubs are not as readily obtainable due to markets that are not active. Given that limited market data exists for these contracts, Nevada Power uses forward price curves derived from internal models based on perceived pricing relationships to major trading hubs that are based on unobservable inputs. The model incorporates a mid-market pricing convention (the mid‑point price between bid and ask prices) as a practical expedient for valuing its assets and liabilities measured and reported at fair value. The determination of the fair value for derivative contracts not only includes counterparty risk, but also the impact of Nevada Power's nonperformance risk on its liabilities, which as of September 30, 2017 and December 31, 2016 , had an immaterial impact to the fair value of its derivative contracts. As such, Nevada Power considers its derivative contracts to be valued using Level 3 inputs. Refer to Note 7 for further discussion regarding Nevada Power's risk management and hedging activities. Nevada Power's investments in money market mutual funds and equity securities are accounted for as available-for-sale securities and are stated at fair value. When available, a readily observable quoted market price or net asset value of an identical security in an active market is used to record the fair value. The following table reconciles the beginning and ending balances of Nevada Power's commodity derivative liabilities measured at fair value on a recurring basis using significant Level 3 inputs (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Beginning balance $ (4 ) $ (22 ) $ (14 ) $ (22 ) Changes in fair value recognized in regulatory assets (1 ) (1 ) (3 ) (6 ) Settlements 1 4 13 9 Ending balance $ (4 ) $ (19 ) $ (4 ) $ (19 ) Nevada Power's long-term debt is carried at cost on the Consolidated Balance Sheets. The fair value of Nevada Power's long‑term debt is a Level 2 fair value measurement and has been estimated based upon quoted market prices, where available, or at the present value of future cash flows discounted at rates consistent with comparable maturities with similar credit risks. The carrying value of Nevada Power's variable-rate long-term debt approximates fair value because of the frequent repricing of these instruments at market rates. The following table presents the carrying value and estimated fair value of Nevada Power's long‑term debt (in millions): As of September 30, 2017 As of December 31, 2016 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 2,599 $ 3,055 $ 2,581 $ 3,040
Sierra Pacific Power Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements	Fair Value Measurements The carrying value of Sierra Pacific's cash, certain cash equivalents, receivables, payables, accrued liabilities and short-term borrowings approximates fair value because of the short-term maturity of these instruments. Sierra Pacific has various financial assets and liabilities that are measured at fair value on the Consolidated Balance Sheets using inputs from the three levels of the fair value hierarchy. A financial asset or liability classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. The three levels are as follows: • Level 1 — Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that Sierra Pacific has the ability to access at the measurement date. • Level 2 — Inputs include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market corroborated inputs). • Level 3 — Unobservable inputs reflect Sierra Pacific's judgments about the assumptions market participants would use in pricing the asset or liability since limited market data exists. Sierra Pacific develops these inputs based on the best information available, including its own data. The following table presents Sierra Pacific's financial 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 Total As of September 30, 2017 Assets - investment funds $ — $ — $ — $ — As of December 31, 2016 Assets: Money market mutual funds (1) $ 35 $ — $ — $ 35 Investment funds 1 — — 1 $ 36 $ — $ — $ 36 (1) Amounts are included in cash and cash equivalents on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost. Sierra Pacific's investments in money market mutual funds and equity securities are accounted for as available-for-sale securities and are stated at fair value. When available, a readily observable quoted market price or net asset value of an identical security in an active market is used to record the fair value. Sierra Pacific's long-term debt is carried at cost on the Consolidated Balance Sheets. The fair value of Sierra Pacific's long-term debt is a Level 2 fair value measurement and has been estimated based upon quoted market prices, where available, or at the present value of future cash flows discounted at rates consistent with comparable maturities with similar credit risks. The carrying value of Sierra Pacific's variable-rate long-term debt approximates fair value because of the frequent repricing of these instruments at market rates. The following table presents the carrying value and estimated fair value of Sierra Pacific's long-term debt (in millions): As of September 30, 2017 As of December 31, 2016 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 1,120 $ 1,201 $ 1,119 $ 1,191

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2017
Loss Contingencies [Line Items]
Commitments and Contingencies	Commitments and Contingencies Fuel, Capacity and Transmission Contract Commitments During the nine-month period ended September 30, 2017 , MidAmerican Energy amended certain of its natural gas supply and transportation contracts increasing minimum payments by $247 million through 2021 and $70 million for 2022 through 2037. Construction Commitments During the nine-month period ended September 30, 2017 , MidAmerican Energy entered into contracts totaling $675 million for the construction of wind-powered generating facilities in 2017 through 2019, with remaining payments totaling $84 million for the fourth quarter of 2017, $340 million in 2018 and $8 million in 2019. Operating Leases and Easements During the nine-month period ended September 30, 2017 , MidAmerican Energy entered into non-cancelable easements with minimum payments totaling $114 million through 2057 for land in Iowa on which some of its wind-powered generating facilities will be located. Legal Matters The Company is party to a variety of legal actions arising out of the normal course of business. Plaintiffs occasionally seek punitive or exemplary damages. The Company does not believe that such normal and routine litigation will have a material impact on its consolidated financial results. The Company is also involved in other kinds of legal actions, some of which assert or may assert claims or seek to impose fines, penalties and other costs in substantial amounts and are described below. Environmental Laws and Regulations The Company is subject to federal, state, local and foreign laws and regulations regarding air and water quality, renewable portfolio standards, emissions performance standards, climate change, coal combustion byproduct disposal, hazardous and solid waste disposal, protected species and other environmental matters that have the potential to impact the Company's current and future operations. The Company believes it is in material compliance with all applicable laws and regulations. Hydroelectric Relicensing PacifiCorp 's Klamath hydroelectric system is currently operating under annual licenses with the FERC. In February 2010, PacifiCorp , the United States Department of the Interior, the United States Department of Commerce, the state of California, the state of Oregon and various other governmental and non-governmental settlement parties signed the Klamath Hydroelectric Settlement Agreement ("KHSA"). Congress failed to pass legislation needed to implement the original KHSA. On April 6, 2016, PacifiCorp , the states of California and Oregon and the United States Departments of the Interior and Commerce and other stakeholders executed an amendment to the KHSA. Consistent with the terms of the amended KHSA, on September 23, 2016, PacifiCorp and the Klamath River Renewal Corporation ("KRRC") jointly filed an application with the FERC to transfer the license for the four mainstem Klamath River hydroelectric generating facilities from PacifiCorp to the KRRC. Also on September 23, 2016, the KRRC filed an application with the FERC to surrender the license and decommission the facilities. The KRRC's license surrender application included a request for the FERC to refrain from acting on the surrender application until after the transfer of the license to the KRRC is effective. Under the amended KHSA, PacifiCorp and its customers are protected from uncapped dam removal costs and liabilities. The KRRC must indemnify PacifiCorp from liabilities associated with dam removal. The amended KHSA also limits PacifiCorp 's contribution to facilities removal costs to no more than $200 million , of which up to $184 million would be collected from PacifiCorp 's Oregon customers with the remainder to be collected from PacifiCorp 's California customers. California voters approved a water bond measure in November 2014 from which the state of California's contribution towards facilities removal costs are being drawn. In accordance with this bond measure, additional funding of up to $250 million for facilities removal costs was included in the California state budget in 2016, with the funding effective for at least five years. If facilities removal costs exceed the combined funding that will be available from PacifiCorp 's Oregon and California customers and the state of California, sufficient funds would need to be provided by the KRRC or an entity other than PacifiCorp for removal to proceed. If certain conditions in the amended KHSA are not satisfied and the license does not transfer to the KRRC, PacifiCorp will resume relicensing with the FERC. Guarantees The Company has entered into guarantees as part of the normal course of business and the sale of certain assets. These guarantees are not expected to have a material impact on the Company's consolidated financial results.
PacifiCorp [Member]
Loss Contingencies [Line Items]
Commitments and Contingencies	Commitments and Contingencies Legal Matters PacifiCorp is party to a variety of legal actions arising out of the normal course of business. Plaintiffs occasionally seek punitive or exemplary damages. PacifiCorp does not believe that such normal and routine litigation will have a material impact on its consolidated financial results. Environmental Laws and Regulations PacifiCorp is subject to federal, state and local laws and regulations regarding air and water quality, renewable portfolio standards, emissions performance standards, climate change, coal combustion byproduct disposal, hazardous and solid waste disposal, protected species and other environmental matters that have the potential to impact PacifiCorp's current and future operations. PacifiCorp believes it is in material compliance with all applicable laws and regulations. Hydroelectric Relicensing PacifiCorp's Klamath hydroelectric system is currently operating under annual licenses with the Federal Energy Regulatory Commission ("FERC"). In February 2010, PacifiCorp, the United States Department of the Interior, the United States Department of Commerce, the state of California, the state of Oregon and various other governmental and non-governmental settlement parties signed the Klamath Hydroelectric Settlement Agreement ("KHSA"). Congress failed to pass legislation needed to implement the original KHSA. On April 6, 2016, PacifiCorp, the states of California and Oregon, and the United States Departments of the Interior and Commerce and other stakeholders executed an amendment to the KHSA. Consistent with the terms of the amended KHSA, on September 23, 2016, PacifiCorp and the Klamath River Renewal Corporation ("KRRC") jointly filed an application with the FERC to transfer the license for the four mainstem Klamath River hydroelectric generating facilities from PacifiCorp to the KRRC. Also on September 23, 2016, the KRRC filed an application with the FERC to surrender the license and decommission the facilities. The KRRC's license surrender application included a request for the FERC to refrain from acting on the surrender application until after the transfer of the license to the KRRC is effective. Under the amended KHSA, PacifiCorp and its customers are protected from uncapped dam removal costs and liabilities. The KRRC must indemnify PacifiCorp from liabilities associated with dam removal. The amended KHSA also limits PacifiCorp's contribution to facilities removal costs to no more than $200 million , of which up to $184 million would be collected from PacifiCorp's Oregon customers with the remainder to be collected from PacifiCorp's California customers. California voters approved a water bond measure in November 2014 from which the state of California's contribution toward facilities removal costs are being drawn. In accordance with this bond measure, additional funding of up to $250 million for facilities removal costs was included in the California state budget in 2016, with the funding effective for at least five years. If facilities removal costs exceed the combined funding that will be available from PacifiCorp's Oregon and California customers and the state of California, sufficient funds would need to be provided by the KRRC or an entity other than PacifiCorp for removal to proceed. If certain conditions in the amended KHSA are not satisfied and the license does not transfer to the KRRC, PacifiCorp will resume relicensing with the FERC. Guarantees PacifiCorp has entered into guarantees as part of the normal course of business and the sale of certain assets. These guarantees are not expected to have a material impact on PacifiCorp's consolidated financial results.
MidAmerican Energy Company [Member]
Loss Contingencies [Line Items]
Commitments and Contingencies	Commitments and Contingencies Natural Gas Commitments During the nine-month period ended September 30, 2017 , MidAmerican Energy amended certain of its natural gas supply and transportation contracts increasing minimum payments by $247 million through 2021 and $70 million for 2022 through 2037. Construction Commitments During the nine-month period ended September 30, 2017 , MidAmerican Energy entered into contracts totaling $675 million for the construction of wind-powered generating facilities in 2017 through 2019, with remaining payments totaling $84 million for the fourth quarter of 2017, $340 million in 2018 and $8 million in 2019. Easements During the nine-month period ended September 30, 2017 , MidAmerican Energy entered into non-cancelable easements with minimum payments totaling $114 million through 2057 for land in Iowa on which some of its wind-powered generating facilities will be located. Legal Matters MidAmerican Energy is party to a variety of legal actions arising out of the normal course of business. Plaintiffs occasionally seek punitive or exemplary damages. MidAmerican Energy does not believe that such normal and routine litigation will have a material impact on its financial results. Environmental Laws and Regulations MidAmerican Energy is subject to federal, state and local laws and regulations regarding air and water quality, emissions performance standards, climate change, coal combustion byproduct disposal, hazardous and solid waste disposal, protected species and other environmental matters that have the potential to impact its current and future operations. MidAmerican Energy believes it is in material compliance with all applicable laws and regulations. Transmission Rates MidAmerican Energy's wholesale transmission rates are set annually using FERC-approved formula rates subject to true-up for actual cost of service. Prior to September 2016, the rates in effect were based on a 12.38% return on equity ("ROE"). In November 2013 and February 2015, a coalition of intervenors filed successive complaints with the FERC requesting that the 12.38% ROE no longer be found just and reasonable and sought to reduce the base ROE to 9.15% and 8.67% , respectively. MidAmerican Energy is authorized by the FERC to include a 0.50% adder beyond the base ROE effective January 2015. In September 2016, the FERC issued an order for the first complaint, which reduces the base ROE to 10.32% and requires refunds, plus interest, for the period from November 2013 through February 2015. Customer refunds relative to the first complaint occurred in February 2017. It is uncertain when the FERC will rule on the second complaint, covering the period from February 2015 through May 2016. MidAmerican Energy believes it is probable that the FERC will order a base ROE lower than 12.38% in the second complaint and, as of September 30, 2017 , has accrued a $9 million liability for refunds under the second complaint of amounts collected under the higher ROE from February 2015 through May 2016.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Loss Contingencies [Line Items]
Commitments and Contingencies	Commitments and Contingencies MidAmerican Funding is party to a variety of legal actions arising out of the normal course of business. Plaintiffs occasionally seek punitive or exemplary damages. MidAmerican Funding does not believe that such normal and routine litigation will have a material impact on its consolidated financial results. Refer to Note 8 of MidAmerican Energy's Notes to Financial Statements.
Nevada Power Company [Member]
Loss Contingencies [Line Items]
Commitments and Contingencies	Commitments and Contingencies Environmental Laws and Regulations Nevada Power is subject to federal, state and local laws and regulations regarding air and water quality, renewable portfolio standards, emissions performance standards, climate change, coal combustion byproduct disposal, hazardous and solid waste disposal, protected species and other environmental matters that have the potential to impact Nevada Power's current and future operations. Nevada Power believes it is in material compliance with all applicable laws and regulations. Senate Bill 123 In June 2013, the Nevada State Legislature passed Senate Bill No. 123 ("SB 123"), which included the retirement of coal plants and replacing the capacity with renewable facilities and other generating facilities. In May 2014, Nevada Power filed its ERCR Plan in compliance with SB 123. In July 2015, Nevada Power filed an amendment to its ERCR Plan with the PUCN which was approved in September 2015. In June 2015, the Nevada State Legislature passed Assembly Bill No. 498, which modified the capacity replacement components of SB 123. Consistent with the ERCR Plan, Nevada Power acquired a 272 -MW natural gas co-generating facility in 2014, acquired a 210 -MW natural gas peaking facility in 2014, constructed a 15 -MW solar photovoltaic facility in 2015, contracted two renewable power purchase agreements with 100 -MW solar photovoltaic generating facilities in 2015, contracted a renewable power purchase agreement with 100 -MW solar photovoltaic generating facility in 2016 and acquired the remaining 130 MW, 25% , of the Silverhawk natural gas-fueled generating facility in April 2017, of which 54 MW were approved as part of the ERCR Plan. Nevada Power has the option to acquire 35 MW of nameplate renewable energy capacity in the future under the ERCR Plan, subject to PUCN approval. Nevada Power retired Reid Gardner Units 1, 2, and 3, 300 MW of coal-fueled generation, in 2014 and Reid Gardner Unit 4, 257 MW of coal-fueled generation, in March 2017. These transactions are related to Nevada Power's compliance with SB 123, resulting in the retirement of 812 MW of coal-fueled generation by 2019. Legal Matters Nevada Power is party to a variety of legal actions arising out of the normal course of business. Plaintiffs occasionally seek punitive or exemplary damages. Nevada Power does not believe that such normal and routine litigation will have a material impact on its consolidated financial results.
Sierra Pacific Power Company [Member]
Loss Contingencies [Line Items]
Commitments and Contingencies	Commitments and Contingencies Environmental Laws and Regulations Sierra Pacific is subject to federal, state and local laws and regulations regarding air and water quality, renewable portfolio standards, emissions performance standards, climate change, coal combustion byproduct disposal, hazardous and solid waste disposal, protected species and other environmental matters that have the potential to impact Sierra Pacific's current and future operations. Sierra Pacific believes it is in material compliance with all applicable laws and regulations. Legal Matters Sierra Pacific is party to a variety of legal actions arising out of the normal course of business. Plaintiffs occasionally seek punitive or exemplary damages. Sierra Pacific does not believe that such normal and routine litigation will have a material impact on its consolidated financial results.

Components of Accumulated Other

Components of Accumulated Other Comprehensive Loss, Net	9 Months Ended
	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Components of Accumulated Other Comprehensive Income (Loss), Net	Components of Other Comprehensive Income (Loss), Net The following table shows the change in AOCI attributable to BHE shareholders by each component of OCI, net of applicable income taxes (in millions): Unrealized Unrecognized Foreign Gains on Unrealized AOCI Amounts on Currency Available- Gains (Losses) Attributable Retirement Translation For-Sale on Cash To BHE Benefits Adjustment Securities Flow Hedges Shareholders, Net Balance, December 31, 2015 $ (438 ) $ (1,092 ) $ 615 $ 7 $ (908 ) Other comprehensive income (loss) 80 (339 ) 151 (2 ) (110 ) Balance, September 30, 2016 $ (358 ) $ (1,431 ) $ 766 $ 5 $ (1,018 ) Balance, December 31, 2016 $ (447 ) $ (1,675 ) $ 585 $ 26 $ (1,511 ) Other comprehensive income (loss) 16 535 542 (5 ) 1,088 Balance, September 30, 2017 $ (431 ) $ (1,140 ) $ 1,127 $ 21 $ (423 ) Reclassifications from AOCI to net income for the periods ended September 30, 2017 and 2016 were insignificant. For information regarding cash flow hedge reclassifications from AOCI to net income in their entirety, refer to Note 9 . Additionally, refer to the " Foreign Operations " discussion in Note 8 for information about unrecognized amounts on retirement benefits reclassifications from AOCI that do not impact net income in their entirety.
MidAmerican Energy Company [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Components of Accumulated Other Comprehensive Income (Loss), Net	Components of Accumulated Other Comprehensive Income (Loss), Net The following table shows the change in accumulated other comprehensive income (loss), net by each component of other comprehensive income, net of applicable income taxes (in millions): Unrealized Unrealized Accumulated Losses on Losses Other Available-For-Sale on Cash Flow Comprehensive Securities Hedges Loss, Net Balance, December 31, 2015 $ (3 ) $ (27 ) $ (30 ) Other comprehensive income 2 — 2 Dividend — 27 27 Balance at September 30, 2016 $ (1 ) $ — $ (1 )
MidAmerican Funding, LLC and Subsidiaries [Domain]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Components of Accumulated Other Comprehensive Income (Loss), Net	Components of Accumulated Other Comprehensive Income (Loss), Net Refer to Note 9 of MidAmerican Energy's Notes to Financial Statements.

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2017
Segment Reporting Information [Line Items]
Segment Reporting Disclosure [Text Block]	Segment Information The Company's reportable segments with foreign operations include Northern Powergrid , whose business is principally in the United Kingdom, BHE Transmission , whose business includes operations in Canada, and BHE Renewables , whose business includes operations in the Philippines. Intersegment eliminations and adjustments, including the allocation of goodwill, have been made. Information related to the Company's reportable segments is shown below (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Operating revenue: PacifiCorp $ 1,430 $ 1,434 $ 3,956 $ 3,919 MidAmerican Funding 815 797 2,170 2,008 NV Energy 1,047 987 2,384 2,309 Northern Powergrid 221 220 685 748 BHE Pipeline Group 193 201 700 704 BHE Transmission 182 169 506 309 BHE Renewables 283 273 647 582 HomeServices 961 820 2,502 2,152 BHE and Other (1) 151 191 453 523 Total operating revenue $ 5,283 $ 5,092 $ 14,003 $ 13,254 Depreciation and amortization: PacifiCorp $ 200 $ 193 $ 598 $ 589 MidAmerican Funding 112 118 370 338 NV Energy 105 106 315 315 Northern Powergrid 55 49 156 149 BHE Pipeline Group 42 53 115 160 BHE Transmission 58 61 165 177 BHE Renewables 63 57 187 169 HomeServices 16 9 38 24 BHE and Other (1) — 2 (1 ) 1 Total depreciation and amortization $ 651 $ 648 $ 1,943 $ 1,922 Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Operating income: PacifiCorp $ 467 $ 445 $ 1,150 $ 1,108 MidAmerican Funding 288 284 531 524 NV Energy 393 394 682 656 Northern Powergrid 81 90 308 373 BHE Pipeline Group 65 68 328 320 BHE Transmission 86 81 236 35 BHE Renewables 157 157 256 233 HomeServices 79 87 191 179 BHE and Other (1) 8 (21 ) (38 ) (36 ) Total operating income 1,624 1,585 3,644 3,392 Interest expense (464 ) (460 ) (1,379 ) (1,401 ) Capitalized interest 14 14 34 128 Allowance for equity funds 24 17 59 147 Interest and dividend income 32 39 85 93 Other, net 2 15 24 26 Total income before income tax expense and equity income $ 1,232 $ 1,210 $ 2,467 $ 2,385 Interest expense: PacifiCorp $ 95 $ 95 $ 285 $ 286 MidAmerican Funding 59 55 177 164 NV Energy 57 60 173 190 Northern Powergrid 34 33 98 105 BHE Pipeline Group 11 13 33 39 BHE Transmission 45 40 125 114 BHE Renewables 51 51 153 148 HomeServices 1 1 3 2 BHE and Other (1) 111 112 332 353 Total interest expense $ 464 $ 460 $ 1,379 $ 1,401 Operating revenue by country: United States $ 4,869 $ 4,697 $ 12,793 $ 12,185 United Kingdom 221 220 685 748 Canada 182 170 506 313 Philippines and other 11 5 19 8 Total operating revenue by country $ 5,283 $ 5,092 $ 14,003 $ 13,254 Income before income tax expense and equity income by country: United States $ 1,113 $ 1,089 $ 2,065 $ 1,945 United Kingdom 49 74 213 284 Canada 47 43 127 114 Philippines and other 23 4 62 42 Total income before income tax expense and equity income by country $ 1,232 $ 1,210 $ 2,467 $ 2,385 As of September 30, December 31, 2017 2016 Assets: PacifiCorp $ 23,578 $ 23,563 MidAmerican Funding 19,019 17,571 NV Energy 14,344 14,320 Northern Powergrid 7,280 6,433 BHE Pipeline Group 4,958 5,144 BHE Transmission 9,182 8,378 BHE Renewables 7,492 7,010 HomeServices 2,834 1,776 BHE and Other (1) 2,367 1,245 Total assets $ 91,054 $ 85,440 (1) The differences between the reportable segment amounts and the consolidated amounts, described as BHE and Other , relate principally to other entities, corporate functions and intersegment eliminations. The following table shows the change in the carrying amount of goodwill by reportable segment for the nine-month period ended September 30, 2017 (in millions): BHE Pipeline Group MidAmerican Funding NV Energy Northern Powergrid BHE Transmission BHE Renewables HomeServices PacifiCorp Total December 31, 2016 $ 1,129 $ 2,102 $ 2,369 $ 930 $ 75 $ 1,470 $ 95 $ 840 $ 9,010 Acquisitions — — — — — — — 522 522 Foreign currency translation — — — 56 — 114 — — 170 Other — — — — (2 ) — — — (2 ) September 30, 2017 $ 1,129 $ 2,102 $ 2,369 $ 986 $ 73 $ 1,584 $ 95 $ 1,362 $ 9,700
MidAmerican Energy Company [Member]
Segment Reporting Information [Line Items]
Segment Reporting Disclosure [Text Block]	Segment Information MidAmerican Energy has identified two reportable segments: regulated electric and regulated gas. The regulated electric segment derives most of its revenue from regulated retail sales of electricity to residential, commercial, and industrial customers and from wholesale sales. The regulated gas segment derives most of its revenue from regulated retail sales of natural gas to residential, commercial, and industrial customers and also obtains revenue by transporting gas owned by others through its distribution system. Pricing for regulated electric and regulated gas sales are established separately by regulatory agencies; therefore, management also reviews each segment separately to make decisions regarding allocation of resources and in evaluating performance. Common operating costs, interest income, interest expense and income tax expense are allocated to each segment based on certain factors, which primarily relate to the nature of the cost. The following tables provide information on a reportable segment basis (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Operating revenue: Regulated electric $ 707 $ 692 $ 1,677 $ 1,572 Regulated gas 103 102 485 430 Other 3 1 4 2 Total operating revenue $ 813 $ 795 $ 2,166 $ 2,004 Depreciation and amortization: Regulated electric $ 101 $ 107 $ 338 $ 306 Regulated gas 10 11 31 32 Total depreciation and amortization $ 111 $ 118 $ 369 $ 338 Operating income: Regulated electric $ 290 $ 289 $ 485 $ 481 Regulated gas (2 ) (5 ) 45 42 Total operating income $ 288 $ 284 $ 530 $ 523 As of September 30, December 31, Assets: Regulated electric $ 15,556 $ 14,113 Regulated gas 1,339 1,345 Other 7 1 Total assets $ 16,902 $ 15,459
MidAmerican Funding, LLC and Subsidiaries [Domain]
Segment Reporting Information [Line Items]
Segment Reporting Disclosure [Text Block]	Segment Information MidAmerican Funding has identified two reportable segments: regulated electric and regulated gas. The regulated electric segment derives most of its revenue from regulated retail sales of electricity to residential, commercial, and industrial customers and from wholesale sales. The regulated gas segment derives most of its revenue from regulated retail sales of natural gas to residential, commercial, and industrial customers and also obtains revenue by transporting gas owned by others through its distribution system. Pricing for regulated electric and regulated gas sales are established separately by regulatory agencies; therefore, management also reviews each segment separately to make decisions regarding allocation of resources and in evaluating performance. Common operating costs, interest income, interest expense and income tax expense are allocated to each segment based on certain factors, which primarily relate to the nature of the cost. "Other" in the tables below consists of the financial results and assets of nonregulated operations, MHC and MidAmerican Funding . The following tables provide information on a reportable segment basis (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Operating revenue: Regulated electric $ 707 $ 692 $ 1,677 $ 1,572 Regulated gas 103 102 485 430 Other 5 3 8 6 Total operating revenue $ 815 $ 797 $ 2,170 $ 2,008 Depreciation and amortization: Regulated electric $ 101 $ 107 $ 338 $ 306 Regulated gas 10 11 31 32 Total depreciation and amortization $ 111 $ 118 $ 369 $ 338 Operating income: Regulated electric $ 290 $ 289 $ 485 $ 481 Regulated gas (2 ) (5 ) 45 42 Other — — 1 1 Total operating income $ 288 $ 284 $ 531 $ 524 As of September 30, December 31, Assets (1) : Regulated electric $ 16,747 $ 15,304 Regulated gas 1,418 1,424 Other 31 19 Total assets $ 18,196 $ 16,747 (1) Assets by reportable segment reflect the assignment of goodwill to applicable reporting units.
Sierra Pacific Power Company [Member]
Segment Reporting Information [Line Items]
Segment Reporting Disclosure [Text Block]	Segment Information Sierra Pacific has identified two reportable operating segments: regulated electric and regulated natural gas. The regulated electric segment derives most of its revenue from regulated retail sales of electricity to residential, commercial, and industrial customers and from wholesale sales. The regulated natural gas segment derives most of its revenue from regulated retail sales of natural gas to residential, commercial, and industrial customers and also obtains revenue by transporting natural gas owned by others through its distribution system. Pricing for regulated electric and regulated natural gas sales are established separately by the PUCN; therefore, management also reviews each segment separately to make decisions regarding allocation of resources and in evaluating performance. Sierra Pacific believes presenting gross margin allows the reader to assess the impact of Sierra Pacific's regulatory treatment and its overall regulatory environment on a consistent basis and is meaningful. Gross margin is calculated as operating revenue less cost of fuel, energy and capacity and natural gas purchased for resale ("cost of sales"). The following tables provide information on a reportable segment basis (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Operating revenue: Regulated electric $ 215 $ 207 $ 534 $ 539 Regulated gas 15 15 66 81 Total operating revenue $ 230 $ 222 $ 600 $ 620 Cost of sales: Regulated electric $ 76 $ 73 $ 193 $ 208 Regulated gas 4 5 26 42 Total cost of sales $ 80 $ 78 $ 219 $ 250 Gross margin: Regulated electric $ 139 $ 134 $ 341 $ 331 Regulated gas 11 10 40 39 Total gross margin $ 150 $ 144 $ 381 $ 370 Operating and maintenance: Regulated electric $ 36 $ 36 $ 108 $ 112 Regulated gas 4 4 13 14 Total operating and maintenance $ 40 $ 40 $ 121 $ 126 Depreciation and amortization: Regulated electric $ 25 $ 26 $ 74 $ 76 Regulated gas 4 4 11 12 Total depreciation and amortization $ 29 $ 30 $ 85 $ 88 Operating income: Regulated electric $ 72 $ 68 $ 142 $ 127 Regulated gas 3 1 15 11 Total operating income $ 75 $ 69 $ 157 $ 138 Interest expense: Regulated electric $ 10 $ 11 $ 30 $ 38 Regulated gas 1 1 3 4 Total interest expense $ 11 $ 12 $ 33 $ 42 As of September 30, December 31, 2017 2016 Assets: Regulated electric $ 3,165 $ 3,119 Regulated gas 305 314 Regulated common assets (1) 37 60 Total assets $ 3,507 $ 3,493 (1) Consists principally of cash and cash equivalents not included in either the regulated electric or regulated natural gas segments.

Related Party Transactions Rela

Related Party Transactions Related Party Transactions (Notes)	9 Months Ended
	Sep. 30, 2017
PacifiCorp [Member]
Related Party Transaction [Line Items]
Related Party Transactions Disclosure [Text Block]	Related Party Transactions Berkshire Hathaway includes BHE and its subsidiaries in its United States federal income tax return. Consistent with established regulatory practice, PacifiCorp's provision for income taxes has been computed on a stand-alone basis, and substantially all of its currently payable or receivable income taxes are remitted to or received from BHE . For the nine-month periods ended September 30, 2017 and 2016, PacifiCorp made net cash payments for federal and state income taxes to BHE totaling $205 million and $61 million , respectively.

Property, Plant and Equipment52

Property, Plant and Equipment, Net (Tables)	9 Months Ended
	Sep. 30, 2017
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment [Table Text Block]	Property, plant and equipment, net consists of the following (in millions): As of Depreciable September 30, December 31, Life 2017 2016 Regulated assets: Utility generation, transmission and distribution systems 5-80 years $ 73,138 $ 71,536 Interstate natural gas pipeline assets 3-80 years 6,991 6,942 80,129 78,478 Accumulated depreciation and amortization (24,525 ) (23,603 ) Regulated assets, net 55,604 54,875 Nonregulated assets: Independent power plants 5-30 years 5,911 5,594 Other assets 3-30 years 1,265 1,002 7,176 6,596 Accumulated depreciation and amortization (1,304 ) (1,060 ) Nonregulated assets, net 5,872 5,536 Net operating assets 61,476 60,411 Construction work-in-progress 3,503 2,098 Property, plant and equipment, net $ 64,979 $ 62,509
MidAmerican Energy Company [Member]
Property, Plant and Equipment [Line Items]
Public Utility Property, Plant, and Equipment	Property, plant and equipment, net consists of the following (in millions): As of September 30, December 31, Depreciable Life 2017 2016 Utility plant in service, net: Generation 20-70 years $ 11,339 $ 11,282 Transmission 52-75 years 1,802 1,726 Electric distribution 20-75 years 3,297 3,197 Gas distribution 29-75 years 1,606 1,565 Utility plant in service 18,044 17,770 Accumulated depreciation and amortization (5,765 ) (5,448 ) Utility plant in service, net 12,279 12,322 Nonregulated property, net: Nonregulated property gross 20-50 years 7 7 Accumulated depreciation and amortization (1 ) (1 ) Nonregulated property, net 6 6 12,285 12,328 Construction work-in-progress 1,302 493 Property, plant and equipment, net $ 13,587 $ 12,821
PacifiCorp [Member]
Property, Plant and Equipment [Line Items]
Public Utility Property, Plant, and Equipment	Property, plant and equipment, net consists of the following (in millions): As of September 30, December 31, Depreciable Life 2017 2016 Property, plant and equipment in-service 5-75 years $ 27,599 $ 27,298 Accumulated depreciation and amortization (9,222 ) (8,793 ) Net property, plant and equipment in-service 18,377 18,505 Construction work-in-progress 758 657 Total property, plant and equipment, net $ 19,135 $ 19,162
Nevada Power Company [Member]
Property, Plant and Equipment [Line Items]
Public Utility Property, Plant, and Equipment	Property, plant and equipment, net consists of the following (in millions): As of Depreciable Life September 30, December 31, 2017 2016 Utility plant: Generation 30 - 55 years $ 3,725 $ 4,271 Distribution 20 - 65 years 3,294 3,231 Transmission 45 - 65 years 1,860 1,846 General and intangible plant 5 - 65 years 784 738 Utility plant 9,663 10,086 Accumulated depreciation and amortization (2,840 ) (3,205 ) Utility plant, net 6,823 6,881 Other non-regulated, net of accumulated depreciation and amortization 45 years 2 2 Plant, net 6,825 6,883 Construction work-in-progress 65 114 Property, plant and equipment, net $ 6,890 $ 6,997
Sierra Pacific Power Company [Member]
Property, Plant and Equipment [Line Items]
Public Utility Property, Plant, and Equipment	Property, plant and equipment, net consists of the following (in millions): As of Depreciable Life September 30, December 31, 2017 2016 Utility plant: Electric generation 25 - 60 years $ 1,140 $ 1,137 Electric distribution 20 - 100 years 1,445 1,417 Electric transmission 50 - 100 years 782 771 Electric general and intangible plant 5 - 70 years 182 164 Natural gas distribution 35 - 70 years 388 381 Natural gas general and intangible plant 5 - 70 years 14 15 Common general 5 - 70 years 290 267 Utility plant 4,241 4,152 Accumulated depreciation and amortization (1,496 ) (1,442 ) Utility plant, net 2,745 2,710 Other non-regulated, net of accumulated depreciation and amortization 70 years 5 5 Plant, net 2,750 2,715 Construction work-in-progress 112 107 Property, plant and equipment, net $ 2,862 $ 2,822

Investments and Restricted Ca53

Investments and Restricted Cash and Investments (Tables)	9 Months Ended
	Sep. 30, 2017
Investments and Restricted Cash and Investments [Abstract]
Investments and Restricted Cash and Investments	Investments and restricted cash and investments consists of the following (in millions): As of September 30, December 31, 2017 2016 Investments: BYD Company Limited common stock $ 2,087 $ 1,185 Rabbi trusts 431 403 Other 132 106 Total investments 2,650 1,694 Equity method investments: BHE Renewables tax equity investments 804 741 Electric Transmission Texas, LLC 693 672 Bridger Coal Company 140 165 Other 158 142 Total equity method investments 1,795 1,720 Restricted cash and investments: Quad Cities Station nuclear decommissioning trust funds 498 460 Other 317 282 Total restricted cash and investments 815 742 Total investments and restricted cash and investments $ 5,260 $ 4,156 Reflected as: Other current assets $ 273 $ 211 Noncurrent assets 4,987 3,945 Total investments and restricted cash and investments $ 5,260 $ 4,156

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2017
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Schedule of Effective Income Tax Rate Reconciliation	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: Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Federal statutory income tax rate 35 % 35 % 35 % 35 % Income tax credits (19 ) (16 ) (18 ) (15 ) State income tax, net of federal income tax benefit — — (1 ) — Income tax effect of foreign income (3 ) (3 ) (4 ) (4 ) Equity income 1 1 1 1 Other, net 1 (1 ) — — Effective income tax rate 15 % 16 % 13 % 17 %
MidAmerican Energy Company [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Schedule of Effective Income Tax Rate Reconciliation	A reconciliation of the federal statutory income tax rate to MidAmerican Energy's effective income tax rate applicable to income before income tax benefit is as follows: Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Federal statutory income tax rate 35 % 35 % 35 % 35 % Income tax credits (74 ) (58 ) (74 ) (58 ) State income tax, net of federal income tax benefit (10 ) (6 ) (7 ) (4 ) Effects of ratemaking (2 ) (1 ) (4 ) (3 ) Other, net (1 ) — — — Effective income tax rate (52 )% (30 )% (50 )% (30 )%
MidAmerican Funding, LLC and Subsidiaries [Domain]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Schedule of Effective Income Tax Rate Reconciliation	A reconciliation of the federal statutory income tax rate to MidAmerican Funding 's effective income tax rate applicable to income before income tax benefit is as follows: Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Federal statutory income tax rate 35 % 35 % 35 % 35 % Income tax credits (76 ) (60 ) (76 ) (61 ) State income tax, net of federal income tax benefit (10 ) (7 ) (8 ) (4 ) Effects of ratemaking (2 ) — (4 ) (3 ) Effective income tax rate (53 )% (32 )% (53 )% (33 )%

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Schedule of Defined Benefit Plans Disclosures	Foreign Operations Net periodic benefit cost for the United Kingdom pension plan included the following components (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Service cost $ 6 $ 5 $ 19 $ 16 Interest cost 15 17 44 55 Expected return on plan assets (25 ) (27 ) (74 ) (85 ) Settlement 18 — 18 — Net amortization 17 11 50 34 Net periodic benefit cost $ 31 $ 6 $ 57 $ 20 Domestic Operations Net periodic benefit cost (credit) for the domestic pension and other postretirement benefit plans included the following components (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Pension: Service cost $ 6 $ 7 $ 18 $ 22 Interest cost 29 31 87 94 Expected return on plan assets (40 ) (39 ) (120 ) (120 ) Net amortization 7 12 22 36 Net periodic benefit cost $ 2 $ 11 $ 7 $ 32 Other postretirement: Service cost $ 3 $ 2 $ 7 $ 7 Interest cost 7 7 21 23 Expected return on plan assets (9 ) (10 ) (30 ) (31 ) Net amortization (3 ) (2 ) (10 ) (9 ) Net periodic benefit credit $ (2 ) $ (3 ) $ (12 ) $ (10 )
PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Defined Benefit Plans Disclosures	Net periodic benefit (credit) cost for the pension and other postretirement benefit plans included the following components (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Pension: Service cost $ — $ 1 $ — $ 3 Interest cost 12 14 37 41 Expected return on plan assets (18 ) (18 ) (54 ) (56 ) Net amortization 3 8 10 25 Net periodic benefit (credit) cost $ (3 ) $ 5 $ (7 ) $ 13 Other postretirement: Service cost $ 1 $ 1 $ 2 $ 2 Interest cost 3 3 10 11 Expected return on plan assets (5 ) (5 ) (16 ) (16 ) Net amortization (1 ) (1 ) (4 ) (4 ) Net periodic benefit credit $ (2 ) $ (2 ) $ (8 ) $ (7 )
MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Defined Benefit Plans Disclosures	Net periodic benefit (credit) cost for the plans of MidAmerican Energy and the aforementioned affiliates included the following components (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Pension: Service cost $ 2 $ 3 $ 7 $ 8 Interest cost 8 8 23 25 Expected return on plan assets (11 ) (11 ) (33 ) (33 ) Net amortization — — 1 1 Net periodic benefit (credit) cost $ (1 ) $ — $ (2 ) $ 1 Other postretirement: Service cost $ 2 $ 1 $ 4 $ 4 Interest cost 3 2 7 7 Expected return on plan assets (3 ) (3 ) (10 ) (10 ) Net amortization (1 ) (1 ) (3 ) (3 ) Net periodic benefit cost (credit) $ 1 $ (1 ) $ (2 ) $ (2 )
Nevada Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Amounts Recognized in Balance Sheet	Amounts payable to NV Energy are included on the Consolidated Balance Sheets and consist of the following (in millions): As of September 30, December 31, 2017 2016 Qualified Pension Plan - Other long-term liabilities $ (27 ) $ (24 ) Non-Qualified Pension Plans: Other current liabilities (1 ) (1 ) Other long-term liabilities (9 ) (9 ) Other Postretirement Plans - Other long-term liabilities (4 ) (4 )
Sierra Pacific Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Amounts Recognized in Balance Sheet	Amounts payable to NV Energy are included on the Consolidated Balance Sheets and consist of the following (in millions): As of September 30, December 31, 2017 2016 Qualified Pension Plan - Other long-term liabilities $ (13 ) $ (12 ) Non-Qualified Pension Plans: Other current liabilities (1 ) (1 ) Other long-term liabilities (9 ) (9 ) Other Postretirement Plans - Other long-term liabilities (25 ) (28 )

Risk Management and Hedging A56

Risk Management and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2017
Derivative [Line Items]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	The following table, which reflects master netting arrangements and excludes contracts that have been designated as normal under the normal purchases or normal sales exception afforded by GAAP, summarizes the fair value of the Company's derivative contracts, on a gross basis, and reconciles those amounts to the amounts presented on a net basis on the Consolidated Balance Sheets (in millions): Other Other Other Current Other Current Long-term Assets Assets Liabilities Liabilities Total As of September 30, 2017 Not designated as hedging contracts: Commodity assets (1) $ 16 $ 93 $ 7 $ 3 $ 119 Commodity liabilities (1) (1 ) — (60 ) (135 ) (196 ) Interest rate assets 22 — — — 22 Interest rate liabilities — — (3 ) (7 ) (10 ) Total 37 93 (56 ) (139 ) (65 ) Designated as hedging contracts: Commodity assets — — 2 6 8 Commodity liabilities — — (11 ) (17 ) (28 ) Interest rate assets — 6 — — 6 Interest rate liabilities — — (1 ) — (1 ) Total — 6 (10 ) (11 ) (15 ) Total derivatives 37 99 (66 ) (150 ) (80 ) Cash collateral receivable — — 21 64 85 Total derivatives - net basis $ 37 $ 99 $ (45 ) $ (86 ) $ 5 Other Other Other Current Other Current Long-term Assets Assets Liabilities Liabilities Total As of December 31, 2016 Not designated as hedging contracts: Commodity assets (1) $ 42 $ 86 $ 5 $ 2 $ 135 Commodity liabilities (1) (10 ) — (46 ) (150 ) (206 ) Interest rate assets 15 — — — 15 Interest rate liabilities — — (4 ) (6 ) (10 ) Total 47 86 (45 ) (154 ) (66 ) Designated as hedging contracts: Commodity assets 1 — 2 3 6 Commodity liabilities — — (14 ) (8 ) (22 ) Interest rate assets — 8 — — 8 Interest rate liabilities — — (3 ) — (3 ) Total 1 8 (15 ) (5 ) (11 ) Total derivatives 48 94 (60 ) (159 ) (77 ) Cash collateral receivable — — 13 61 74 Total derivatives - net basis $ 48 $ 94 $ (47 ) $ (98 ) $ (3 ) (1) The Company's commodity derivatives not designated as hedging contracts are generally included in regulated rates, and as of September 30, 2017 and December 31, 2016 , a net regulatory asset of $162 million and $148 million , respectively, was recorded related to the net derivative liability of $77 million and $71 million , respectively. The difference between the net regulatory asset and the net derivative liability relates primarily to a power purchase agreement derivative at BHE Renewables .
Schedule of Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Contracts	The following table reconciles the beginning and ending balances of the Company's net regulatory assets and summarizes the pre-tax gains and losses on commodity derivative contracts recognized in net regulatory assets, as well as amounts reclassified to earnings (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Beginning balance $ 162 $ 185 $ 148 $ 250 Changes in fair value recognized in net regulatory assets 10 18 43 5 Net (losses) gains reclassified to operating revenue (5 ) (3 ) 9 (6 ) Net losses reclassified to cost of sales (5 ) (5 ) (38 ) (54 ) Ending balance $ 162 $ 195 $ 162 $ 195
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)	The following table reconciles the beginning and ending balances of the Company's accumulated other comprehensive (income) loss (pre-tax) and summarizes pre-tax gains and losses on commodity derivative contracts designated and qualifying as cash flow hedges recognized in OCI, as well as amounts reclassified to earnings (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Beginning balance $ 21 $ 26 $ 16 $ 46 Changes in fair value recognized in OCI 5 15 28 35 Net gains reclassified to operating revenue — 1 — 1 Net losses reclassified to cost of sales (7 ) (7 ) (25 ) (47 ) Ending balance $ 19 $ 35 $ 19 $ 35
Schedule of Notional Amounts of Outstanding Derivative Positions	The following table summarizes the net notional amounts of outstanding derivative contracts with fixed price terms that comprise the mark-to-market values as of (in millions): Unit of September 30, December 31, Measure 2017 2016 Electricity purchases Megawatt hours 9 5 Natural gas purchases Decatherms 339 271 Fuel purchases Gallons 2 11 Interest rate swaps US$ 694 714 Interest rate swaps £ 102 — Mortgage sale commitments, net US$ (442 ) (309 )
PacifiCorp [Member]
Derivative [Line Items]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	The following table, which reflects master netting arrangements and excludes contracts that have been designated as normal under the normal purchases or normal sales exception afforded by GAAP, summarizes the fair value of PacifiCorp's derivative contracts, on a gross basis, and reconciles those amounts to the amounts presented on a net basis on the Consolidated Balance Sheets (in millions): Other Other Other Current Other Current Long-term Assets Assets Liabilities Liabilities Total As of September 30, 2017 Not designated as hedging contracts (1) : Commodity assets $ 4 $ 1 $ 2 $ — $ 7 Commodity liabilities (1 ) — (24 ) (82 ) (107 ) Total 3 1 (22 ) (82 ) (100 ) Total derivatives 3 1 (22 ) (82 ) (100 ) Cash collateral receivable — — 16 57 73 Total derivatives - net basis $ 3 $ 1 $ (6 ) $ (25 ) $ (27 ) As of December 31, 2016 Not designated as hedging contracts (1) : Commodity assets $ 24 $ 2 $ 1 $ — $ 27 Commodity liabilities (6 ) — (14 ) (84 ) (104 ) Total 18 2 (13 ) (84 ) (77 ) Total derivatives 18 2 (13 ) (84 ) (77 ) Cash collateral receivable — — 10 59 69 Total derivatives - net basis $ 18 $ 2 $ (3 ) $ (25 ) $ (8 ) (1) PacifiCorp's commodity derivatives are generally included in rates and as of September 30, 2017 and December 31, 2016 , a regulatory asset of $97 million and $73 million , respectively, was recorded related to the net derivative liability of $100 million and $77 million , respectively.
Schedule of Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Contracts	The following table reconciles the beginning and ending balances of PacifiCorp's net regulatory assets and summarizes the pre-tax gains and losses on commodity derivative contracts recognized in net regulatory assets, as well as amounts reclassified to earnings (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Beginning balance $ 95 $ 89 $ 73 $ 133 Changes in fair value recognized in net regulatory assets 6 15 36 (4 ) Net (losses) gains reclassified to operating revenue (5 ) (2 ) 8 8 Net gains (losses) reclassified to energy costs 1 — (20 ) (35 ) Ending balance $ 97 $ 102 $ 97 $ 102
Schedule of Notional Amounts of Outstanding Derivative Positions	The following table summarizes the net notional amounts of outstanding commodity derivative contracts with fixed price terms that comprise the mark-to-market values as of (in millions): Unit of September 30, December 31, Measure 2017 2016 Electricity sales Megawatt hours (3 ) (3 ) Natural gas purchases Decatherms 97 84 Fuel oil purchases Gallons 2 11
Nevada Power Company [Member]
Derivative [Line Items]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	The following table, which excludes contracts that have been designated as normal under the normal purchases or normal sales exception afforded by GAAP, summarizes the fair value of Nevada Power's derivative contracts, on a gross basis, and reconciles those amounts to the amounts presented on a net basis on the Consolidated Balance Sheets (in millions): Other Other Current Long-term Liabilities Liabilities Total As of September 30, 2017 Commodity liabilities (1) $ (3 ) $ (1 ) $ (4 ) As of December 31, 2016 Commodity liabilities (1) $ (7 ) $ (7 ) $ (14 ) (1) Nevada Power's commodity derivatives not designated as hedging contracts are included in regulated rates and as of September 30, 2017 and December 31, 2016 , a regulatory asset of $4 million and $14 million , respectively, was recorded related to the derivative liability of $4 million and $14 million , respectively.
Schedule of Notional Amounts of Outstanding Derivative Positions	The following table summarizes the net notional amounts of outstanding derivative contracts with indexed and fixed price terms that comprise the mark-to-market values (in millions): As of Unit of September 30, December 31, Measure 2017 2016 Electricity sales Megawatt hours — (2 ) Natural gas purchases Decatherms 149 114

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following table presents the Company's financial 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 September 30, 2017 Assets: Commodity derivatives $ 1 $ 24 $ 102 $ (19 ) $ 108 Interest rate derivatives — 14 14 — 28 Mortgage loans held for sale — 534 — — 534 Money market mutual funds (2) 855 — — — 855 Debt securities: United States government obligations 168 — — — 168 International government obligations — 5 — — 5 Corporate obligations — 37 — — 37 Municipal obligations — 2 — — 2 Agency, asset and mortgage-backed obligations — 1 — — 1 Equity securities: United States companies 270 — — — 270 International companies 2,094 — — — 2,094 Investment funds 182 — — — 182 $ 3,570 $ 617 $ 116 $ (19 ) $ 4,284 Liabilities: Commodity derivatives $ (1 ) $ (207 ) $ (16 ) $ 104 $ (120 ) Interest rate derivatives — (10 ) (1 ) — (11 ) $ (1 ) $ (217 ) $ (17 ) $ 104 $ (131 ) As of December 31, 2016 Assets: Commodity derivatives $ 5 $ 49 $ 87 $ (22 ) $ 119 Interest rate derivatives — 16 7 — 23 Mortgage loans held for sale — 359 — — 359 Money market mutual funds (2) 586 — — — 586 Debt securities: United States government obligations 161 — — — 161 International government obligations — 3 — — 3 Corporate obligations — 36 — — 36 Municipal obligations — 2 — — 2 Agency, asset and mortgage-backed obligations — 2 — — 2 Equity securities: United States companies 250 — — — 250 International companies 1,190 — — — 1,190 Investment funds 147 — — — 147 $ 2,339 $ 467 $ 94 $ (22 ) $ 2,878 Liabilities: Commodity derivatives $ (2 ) $ (199 ) $ (27 ) $ 96 $ (132 ) Interest rate derivatives (1 ) (11 ) (1 ) — (13 ) $ (3 ) $ (210 ) $ (28 ) $ 96 $ (145 ) (1) Represents netting under master netting arrangements and a net cash collateral receivable of $85 million and $74 million as of September 30, 2017 and December 31, 2016 , 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.
Fair Value Assets and Liabilities Net Measured On Recurring Basis Unobservable Input Reconciliation	The following table reconciles the beginning and ending balances of the Company's assets and liabilities measured at fair value on a recurring basis using significant Level 3 inputs (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, Interest Auction Interest Auction Commodity Rate Rate Commodity Rate Rate Derivatives Derivatives Securities Derivatives Derivatives Securities 2017: Beginning balance $ 81 $ 8 $ — $ 60 $ 6 $ — Changes included in earnings 7 34 — 19 100 — Changes in fair value recognized in OCI (1 ) — — (3 ) — — Changes in fair value recognized in net regulatory assets (3 ) — — (5 ) — — Purchases — 8 — 1 6 — Settlements 2 (37 ) — 14 (99 ) — Ending balance $ 86 $ 13 $ — $ 86 $ 13 $ — Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, Interest Auction Interest Auction Commodity Rate Rate Commodity Rate Rate Derivatives Derivatives Securities Derivatives Derivatives Securities 2016: Beginning balance $ 44 $ 14 $ 18 $ 47 $ 4 $ 44 Changes included in earnings 9 49 — 8 103 — Changes in fair value recognized in OCI (2 ) — — (2 ) — 6 Changes in fair value recognized in net regulatory assets (1 ) — — (12 ) — — Purchases 1 — — 1 — — Redemptions — — — — — (32 ) Settlements 5 (52 ) — 14 (96 ) — Ending balance $ 56 $ 11 $ 18 $ 56 $ 11 $ 18
Fair Value, by Balance Sheet Grouping	The following table presents the carrying value and estimated fair value of the Company's long-term debt (in millions): As of September 30, 2017 As of December 31, 2016 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 36,124 $ 41,197 $ 36,116 $ 40,718
PacifiCorp [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following table presents PacifiCorp's financial 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 September 30, 2017 Assets: Commodity derivatives $ — $ 7 $ — $ (3 ) $ 4 Money market mutual funds (2) 100 — — — 100 Investment funds 20 — — — 20 $ 120 $ 7 $ — $ (3 ) $ 124 Liabilities - Commodity derivatives $ — $ (107 ) $ — $ 76 $ (31 ) As of December 31, 2016 Assets: Commodity derivatives $ — $ 27 $ — $ (7 ) $ 20 Money market mutual funds (2) 13 — — — 13 Investment funds 17 — — — 17 $ 30 $ 27 $ — $ (7 ) $ 50 Liabilities - Commodity derivatives $ — $ (104 ) $ — $ 76 $ (28 ) (1) Represents netting under master netting arrangements and a net cash collateral receivable of $73 million and $69 million as of September 30, 2017 and December 31, 2016 , 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.
Fair Value, by Balance Sheet Grouping	PacifiCorp's long-term debt is carried at cost on the Consolidated Balance Sheets. The fair value of PacifiCorp's long-term debt is a Level 2 fair value measurement and has been estimated based upon quoted market prices, where available, or at the present value of future cash flows discounted at rates consistent with comparable maturities with similar credit risks. The carrying value of PacifiCorp's variable-rate long-term debt approximates fair value because of the frequent repricing of these instruments at market rates. The following table presents the carrying value and estimated fair value of PacifiCorp's long-term debt (in millions): As of September 30, 2017 As of December 31, 2016 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 7,005 $ 8,277 $ 7,052 $ 8,204
MidAmerican Energy Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following table presents MidAmerican Energy's financial 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 September 30, 2017: Assets: Commodity derivatives $ — $ 2 $ 2 $ (2 ) $ 2 Money market mutual funds (2) 520 — — — 520 Debt securities: United States government obligations 168 — — — 168 International government obligations — 5 — — 5 Corporate obligations — 37 — — 37 Municipal obligations — 2 — — 2 Agency, asset and mortgage-backed obligations — 1 — — 1 Equity securities: United States companies 270 — — — 270 International companies 7 — — — 7 Investment funds 15 — — — 15 $ 980 $ 47 $ 2 $ (2 ) $ 1,027 Liabilities - commodity derivatives $ — $ (6 ) $ (4 ) $ 2 $ (8 ) Input Levels for Fair Value Measurements Level 1 Level 2 Level 3 Other (1) Total As of December 31, 2016: Assets: Commodity derivatives $ — $ 9 $ 1 $ (2 ) $ 8 Money market mutual funds (2) 1 — — — 1 Debt securities: United States government obligations 161 — — — 161 International government obligations — 3 — — 3 Corporate obligations — 36 — — 36 Municipal obligations — 2 — — 2 Agency, asset and mortgage-backed obligations — 2 — — 2 Equity securities: United States companies 250 — — — 250 International companies 5 — — — 5 Investment funds 9 — — — 9 $ 426 $ 52 $ 1 $ (2 ) $ 477 Liabilities - commodity derivatives $ — $ (3 ) $ (3 ) $ 3 $ (3 ) (1) Represents netting under master netting arrangements and a net cash collateral receivable of $- million and $1 million as of September 30, 2017 and December 31, 2016 , respectively. (2) Amounts are included in cash and cash equivalents and investments and restricted cash and investments on the Balance Sheets. The fair value of these money market mutual funds approximates cost.
Fair Value Assets and Liabilities Net Measured On Recurring Basis Unobservable Input Reconciliation	The following table reconciles the beginning and ending balances of MidAmerican Energy's assets and liabilities measured at fair value on a recurring basis using significant Level 3 inputs (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, Commodity Derivatives Auction Rate Securities Commodity Derivatives Auction Rate Securities 2017: Beginning balance $ (1 ) $ — $ (2 ) $ — Changes in fair value recognized in net regulatory assets (2 ) — (2 ) — Settlements 1 — 2 — Ending balance $ (2 ) $ — $ (2 ) $ — 2016: Beginning balance $ (2 ) $ 18 $ (6 ) $ 26 Transfer to affiliate — — (4 ) — Changes in fair value recognized in OCI — — — 3 Changes in fair value recognized in net regulatory assets (1 ) — (5 ) — Redemptions — — — (11 ) Settlements 1 — 13 — Ending balance $ (2 ) $ 18 $ (2 ) $ 18
Fair Value, by Balance Sheet Grouping	MidAmerican Energy's long-term debt is carried at cost on the Balance Sheets. The fair value of MidAmerican Energy's long-term debt is a Level 2 fair value measurement and has been estimated based upon quoted market prices, where available, or at the present value of future cash flows discounted at rates consistent with comparable maturities with similar credit risks. The carrying value of MidAmerican Energy's variable-rate long-term debt approximates fair value because of the frequent repricing of these instruments at market rates. The following table presents the carrying value and estimated fair value of MidAmerican Energy's long-term debt (in millions): As of September 30, 2017 As of December 31, 2016 Carrying Value Fair Value Carrying Value Fair Value Long-term debt $ 4,894 $ 5,446 $ 4,301 $ 4,735
MidAmerican Funding, LLC and Subsidiaries [Domain]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, by Balance Sheet Grouping	MidAmerican Funding 's long-term debt is carried at cost on the Consolidated Financial Statements. The fair value of MidAmerican Funding 's long-term debt is a Level 2 fair value measurement and has been estimated based upon quoted market prices, where available, or at the present value of future cash flows discounted at rates consistent with comparable maturities with similar credit risks. The carrying value of MidAmerican Funding 's variable-rate long-term debt approximates fair value because of the frequent repricing of these instruments at market rates. The following table presents the carrying value and estimated fair value of MidAmerican Funding 's long-term debt (in millions): As of September 30, 2017 As of December 31, 2016 Carrying Value Fair Value Carrying Value Fair Value Long-term debt $ 5,220 $ 5,873 $ 4,627 $ 5,164
Nevada Power Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following table presents Nevada Power's financial 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 Total As of September 30, 2017 Assets - investment funds $ 2 $ — $ — $ 2 Liabilities - commodity derivatives $ — $ — $ (4 ) $ (4 ) As of December 31, 2016 Assets: Money market mutual funds (1) $ 220 $ — $ — $ 220 Investment funds 6 — — 6 $ 226 $ — $ — $ 226 Liabilities - commodity derivatives $ — $ — $ (14 ) $ (14 ) (1) Amounts are included in cash and cash equivalents on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation	The following table reconciles the beginning and ending balances of Nevada Power's commodity derivative liabilities measured at fair value on a recurring basis using significant Level 3 inputs (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Beginning balance $ (4 ) $ (22 ) $ (14 ) $ (22 ) Changes in fair value recognized in regulatory assets (1 ) (1 ) (3 ) (6 ) Settlements 1 4 13 9 Ending balance $ (4 ) $ (19 ) $ (4 ) $ (19 )
Fair Value, by Balance Sheet Grouping	The following table presents the carrying value and estimated fair value of Nevada Power's long‑term debt (in millions): As of September 30, 2017 As of December 31, 2016 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 2,599 $ 3,055 $ 2,581 $ 3,040
Sierra Pacific Power Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following table presents Sierra Pacific's financial 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 Total As of September 30, 2017 Assets - investment funds $ — $ — $ — $ — As of December 31, 2016 Assets: Money market mutual funds (1) $ 35 $ — $ — $ 35 Investment funds 1 — — 1 $ 36 $ — $ — $ 36 (1) Amounts are included in cash and cash equivalents on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.
Fair Value, by Balance Sheet Grouping	The following table presents the carrying value and estimated fair value of Sierra Pacific's long-term debt (in millions): As of September 30, 2017 As of December 31, 2016 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 1,120 $ 1,201 $ 1,119 $ 1,191

Components of Accumulated Oth58

Components of Accumulated Other Comprehensive Loss, Net (Tables)	9 Months Ended
	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Components of Accumulated Other Comprehensive Loss, Net	The following table shows the change in AOCI attributable to BHE shareholders by each component of OCI, net of applicable income taxes (in millions): Unrealized Unrecognized Foreign Gains on Unrealized AOCI Amounts on Currency Available- Gains (Losses) Attributable Retirement Translation For-Sale on Cash To BHE Benefits Adjustment Securities Flow Hedges Shareholders, Net Balance, December 31, 2015 $ (438 ) $ (1,092 ) $ 615 $ 7 $ (908 ) Other comprehensive income (loss) 80 (339 ) 151 (2 ) (110 ) Balance, September 30, 2016 $ (358 ) $ (1,431 ) $ 766 $ 5 $ (1,018 ) Balance, December 31, 2016 $ (447 ) $ (1,675 ) $ 585 $ 26 $ (1,511 ) Other comprehensive income (loss) 16 535 542 (5 ) 1,088 Balance, September 30, 2017 $ (431 ) $ (1,140 ) $ 1,127 $ 21 $ (423 )
MidAmerican Energy Company [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Components of Accumulated Other Comprehensive Loss, Net	The following table shows the change in accumulated other comprehensive income (loss), net by each component of other comprehensive income, net of applicable income taxes (in millions): Unrealized Unrealized Accumulated Losses on Losses Other Available-For-Sale on Cash Flow Comprehensive Securities Hedges Loss, Net Balance, December 31, 2015 $ (3 ) $ (27 ) $ (30 ) Other comprehensive income 2 — 2 Dividend — 27 27 Balance at September 30, 2016 $ (1 ) $ — $ (1 )

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2017
Segment Reporting Information [Line Items]
Schedule of Segment Reporting Information, by Segment	The Company's reportable segments with foreign operations include Northern Powergrid , whose business is principally in the United Kingdom, BHE Transmission , whose business includes operations in Canada, and BHE Renewables , whose business includes operations in the Philippines. Intersegment eliminations and adjustments, including the allocation of goodwill, have been made. Information related to the Company's reportable segments is shown below (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Operating revenue: PacifiCorp $ 1,430 $ 1,434 $ 3,956 $ 3,919 MidAmerican Funding 815 797 2,170 2,008 NV Energy 1,047 987 2,384 2,309 Northern Powergrid 221 220 685 748 BHE Pipeline Group 193 201 700 704 BHE Transmission 182 169 506 309 BHE Renewables 283 273 647 582 HomeServices 961 820 2,502 2,152 BHE and Other (1) 151 191 453 523 Total operating revenue $ 5,283 $ 5,092 $ 14,003 $ 13,254 Depreciation and amortization: PacifiCorp $ 200 $ 193 $ 598 $ 589 MidAmerican Funding 112 118 370 338 NV Energy 105 106 315 315 Northern Powergrid 55 49 156 149 BHE Pipeline Group 42 53 115 160 BHE Transmission 58 61 165 177 BHE Renewables 63 57 187 169 HomeServices 16 9 38 24 BHE and Other (1) — 2 (1 ) 1 Total depreciation and amortization $ 651 $ 648 $ 1,943 $ 1,922 Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Operating income: PacifiCorp $ 467 $ 445 $ 1,150 $ 1,108 MidAmerican Funding 288 284 531 524 NV Energy 393 394 682 656 Northern Powergrid 81 90 308 373 BHE Pipeline Group 65 68 328 320 BHE Transmission 86 81 236 35 BHE Renewables 157 157 256 233 HomeServices 79 87 191 179 BHE and Other (1) 8 (21 ) (38 ) (36 ) Total operating income 1,624 1,585 3,644 3,392 Interest expense (464 ) (460 ) (1,379 ) (1,401 ) Capitalized interest 14 14 34 128 Allowance for equity funds 24 17 59 147 Interest and dividend income 32 39 85 93 Other, net 2 15 24 26 Total income before income tax expense and equity income $ 1,232 $ 1,210 $ 2,467 $ 2,385 Interest expense: PacifiCorp $ 95 $ 95 $ 285 $ 286 MidAmerican Funding 59 55 177 164 NV Energy 57 60 173 190 Northern Powergrid 34 33 98 105 BHE Pipeline Group 11 13 33 39 BHE Transmission 45 40 125 114 BHE Renewables 51 51 153 148 HomeServices 1 1 3 2 BHE and Other (1) 111 112 332 353 Total interest expense $ 464 $ 460 $ 1,379 $ 1,401 Operating revenue by country: United States $ 4,869 $ 4,697 $ 12,793 $ 12,185 United Kingdom 221 220 685 748 Canada 182 170 506 313 Philippines and other 11 5 19 8 Total operating revenue by country $ 5,283 $ 5,092 $ 14,003 $ 13,254 Income before income tax expense and equity income by country: United States $ 1,113 $ 1,089 $ 2,065 $ 1,945 United Kingdom 49 74 213 284 Canada 47 43 127 114 Philippines and other 23 4 62 42 Total income before income tax expense and equity income by country $ 1,232 $ 1,210 $ 2,467 $ 2,385 As of September 30, December 31, 2017 2016 Assets: PacifiCorp $ 23,578 $ 23,563 MidAmerican Funding 19,019 17,571 NV Energy 14,344 14,320 Northern Powergrid 7,280 6,433 BHE Pipeline Group 4,958 5,144 BHE Transmission 9,182 8,378 BHE Renewables 7,492 7,010 HomeServices 2,834 1,776 BHE and Other (1) 2,367 1,245 Total assets $ 91,054 $ 85,440 (1) The differences between the reportable segment amounts and the consolidated amounts, described as BHE and Other , relate principally to other entities, corporate functions and intersegment eliminations. T
Schedule of Goodwill	e following table shows the change in the carrying amount of goodwill by reportable segment for the nine-month period ended September 30, 2017 (in millions): BHE Pipeline Group MidAmerican Funding NV Energy Northern Powergrid BHE Transmission BHE Renewables HomeServices PacifiCorp Total December 31, 2016 $ 1,129 $ 2,102 $ 2,369 $ 930 $ 75 $ 1,470 $ 95 $ 840 $ 9,010 Acquisitions — — — — — — — 522 522 Foreign currency translation — — — 56 — 114 — — 170 Other — — — — (2 ) — — — (2 ) September 30, 2017 $ 1,129 $ 2,102 $ 2,369 $ 986 $ 73 $ 1,584 $ 95 $ 1,362 $ 9,700
MidAmerican Energy Company [Member]
Segment Reporting Information [Line Items]
Schedule of Segment Reporting Information, by Segment	The following tables provide information on a reportable segment basis (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Operating revenue: Regulated electric $ 707 $ 692 $ 1,677 $ 1,572 Regulated gas 103 102 485 430 Other 3 1 4 2 Total operating revenue $ 813 $ 795 $ 2,166 $ 2,004 Depreciation and amortization: Regulated electric $ 101 $ 107 $ 338 $ 306 Regulated gas 10 11 31 32 Total depreciation and amortization $ 111 $ 118 $ 369 $ 338 Operating income: Regulated electric $ 290 $ 289 $ 485 $ 481 Regulated gas (2 ) (5 ) 45 42 Total operating income $ 288 $ 284 $ 530 $ 523 As of September 30, December 31, Assets: Regulated electric $ 15,556 $ 14,113 Regulated gas 1,339 1,345 Other 7 1 Total assets $ 16,902 $ 15,459
MidAmerican Funding, LLC and Subsidiaries [Domain]
Segment Reporting Information [Line Items]
Schedule of Segment Reporting Information, by Segment	The following tables provide information on a reportable segment basis (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Operating revenue: Regulated electric $ 707 $ 692 $ 1,677 $ 1,572 Regulated gas 103 102 485 430 Other 5 3 8 6 Total operating revenue $ 815 $ 797 $ 2,170 $ 2,008 Depreciation and amortization: Regulated electric $ 101 $ 107 $ 338 $ 306 Regulated gas 10 11 31 32 Total depreciation and amortization $ 111 $ 118 $ 369 $ 338 Operating income: Regulated electric $ 290 $ 289 $ 485 $ 481 Regulated gas (2 ) (5 ) 45 42 Other — — 1 1 Total operating income $ 288 $ 284 $ 531 $ 524 As of September 30, December 31, Assets (1) : Regulated electric $ 16,747 $ 15,304 Regulated gas 1,418 1,424 Other 31 19 Total assets $ 18,196 $ 16,747 (1) Assets by reportable segment reflect the assignment of goodwill to applicable reporting units.
Sierra Pacific Power Company [Member]
Segment Reporting Information [Line Items]
Schedule of Segment Reporting Information, by Segment	The following tables provide information on a reportable segment basis (in millions): Three-Month Periods Nine-Month Periods Ended September 30, Ended September 30, 2017 2016 2017 2016 Operating revenue: Regulated electric $ 215 $ 207 $ 534 $ 539 Regulated gas 15 15 66 81 Total operating revenue $ 230 $ 222 $ 600 $ 620 Cost of sales: Regulated electric $ 76 $ 73 $ 193 $ 208 Regulated gas 4 5 26 42 Total cost of sales $ 80 $ 78 $ 219 $ 250 Gross margin: Regulated electric $ 139 $ 134 $ 341 $ 331 Regulated gas 11 10 40 39 Total gross margin $ 150 $ 144 $ 381 $ 370 Operating and maintenance: Regulated electric $ 36 $ 36 $ 108 $ 112 Regulated gas 4 4 13 14 Total operating and maintenance $ 40 $ 40 $ 121 $ 126 Depreciation and amortization: Regulated electric $ 25 $ 26 $ 74 $ 76 Regulated gas 4 4 11 12 Total depreciation and amortization $ 29 $ 30 $ 85 $ 88 Operating income: Regulated electric $ 72 $ 68 $ 142 $ 127 Regulated gas 3 1 15 11 Total operating income $ 75 $ 69 $ 157 $ 138 Interest expense: Regulated electric $ 10 $ 11 $ 30 $ 38 Regulated gas 1 1 3 4 Total interest expense $ 11 $ 12 $ 33 $ 42 As of September 30, December 31, 2017 2016 Assets: Regulated electric $ 3,165 $ 3,119 Regulated gas 305 314 Regulated common assets (1) 37 60 Total assets $ 3,507 $ 3,493 (1) Consists principally of cash and cash equivalents not included in either the regulated electric or regulated natural gas segments.

General (Details)

General (Details)	9 Months Ended
	Sep. 30, 2017OperatingSegmentsOwnedAndOperatedCompanies
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments | OperatingSegments	8
Number of owned and operated utility companies in the United States	4
Number of states owned and operated utility companies serve customers	11
Number of owned and operated interstate natural gas pipeline companies in the United States	2
Number of owned and operated electricity distribution companies in Great Britain	2
Number of owned and operated electricity transmission companies in Canada	1
Number of owned and operated renewable energy businesses	1
Number of owned and operated residential real estate brokerage firms in the United States	1
Number of owned and operated residential real estate brokerage franchise networks in the United States	1

New Accounting Pronouncements N

New Accounting Pronouncements New Accounting Pronouncements (Details) - BHE (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 542	$ 151

Business Acquisitions (Details)

Business Acquisitions (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 1,102	$ 66
Goodwill	9,700		$ 9,010
Other acquisitions [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	1,100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	1,100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	476
Goodwill	$ 522

Property, Plant and Equipment63

Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment in service, net	$ 61,476	$ 60,411
Construction in Progress, Gross	3,503	2,098
Property, plant and equipment, net	64,979	62,509
Regulated assets [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	80,129	78,478
Accumulated depreciation and amortization	(24,525)	(23,603)
Property, plant and equipment in service, net	55,604	54,875
Construction in Progress, Gross	3,100	1,800
Regulated assets [Member] | Utility generation, transmission and distribution systems
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 73,138	71,536
Regulated assets [Member] | Utility generation, transmission and distribution systems | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	5 years
Regulated assets [Member] | Utility generation, transmission and distribution systems | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	80 years
Regulated assets [Member] | Interstate natural gas pipeline assets
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 6,991	6,942
Regulated assets [Member] | Interstate natural gas pipeline assets | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	3 years
Regulated assets [Member] | Interstate natural gas pipeline assets | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	80 years
Unregulated asset [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 7,176	6,596
Accumulated depreciation and amortization	(1,304)	(1,060)
Property, plant and equipment in service, net	5,872	5,536
Unregulated asset [Member] | Independent power plants
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 5,911	5,594
Unregulated asset [Member] | Independent power plants | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	5 years
Unregulated asset [Member] | Independent power plants | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	30 years
Unregulated asset [Member] | Other assets
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 1,265	$ 1,002
Unregulated asset [Member] | Other assets | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	3 years
Unregulated asset [Member] | Other assets | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	30 years

Property, Plant and Equipment64

Property, Plant and Equipment, Net - PacifiCorp (Details) - PacifiCorp [Member] - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Electric Property Plant And Equipment In Service Gross	$ 27,599	$ 27,298
Public utility accumulated depreciation and amortization	(9,222)	(8,793)
Public Utilities Property, Plant And Equipment In Service, Net	18,377	18,505
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	758	657
Public Utilities, Property, Plant and Equipment, Net	$ 19,135	$ 19,162
Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	5 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	75 years

Property, Plant and Equipment65

Property, Plant and Equipment, Net Property, Plant and Equipment, Net - MEC (Details) - MidAmerican Energy Company [Member] - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 12,285	$ 12,285	$ 12,328
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	1,302	1,302	493
Public Utilities, Property, Plant and Equipment, Net	13,587	13,587	12,821
Regulated assets [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Plant in Service, Excluding Construction Work In Progress	18,044	18,044	17,770
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(5,765)	(5,765)	(5,448)
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	12,279	12,279	12,322
Regulated assets [Member] | Electricity Generation Plant, Non-Nuclear [Member]
Property, Plant and Equipment [Line Items]
Change in Accounting Estimates, Impact on Future Periods		34
Change in Accounting Estimates, Impact on Current Period From Prior Year Change	9	26
Unregulated asset [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(1)	(1)	(1)
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	6	6	6
Gross public utility property, plant and equipment in service	7	7	7
Electric Operations [Member] | Regulated assets [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation or Processing	11,339	11,339	11,282
Public Utilities, Property, Plant and Equipment, Transmission	1,802	1,802	1,726
Public Utilities, Property, Plant and Equipment, Distribution	3,297	3,297	3,197
Natural Gas Processing Plant [Member] | Regulated assets [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution	$ 1,606	$ 1,606	$ 1,565

Property, Plant and Equipment66

Property, Plant and Equipment, Net Property, Plant and Equipment, Net - MidAmerican Funding (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Construction in Progress, Gross	$ 3,503	$ 2,098
MidAmerican Funding, LLC and Subsidiaries [Domain]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	25	22
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(10)	(9)
Construction in Progress, Gross	$ 0	$ 1

Property, Plant and Equipment67

Property, Plant and Equipment, Net Property, Plant and Equipment, Net - NPC(Details) - Nevada Power Company [Member] - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016	Apr. 30, 2017
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 6,825	$ 6,883
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	65	114
Public Utilities, Property, Plant and Equipment, Net	6,890	6,997
130 Megawatts of Natural Gas Energy [Member]
Property, Plant and Equipment [Line Items]
Ownership Percentage Acquired			25.00%
Business Acquisition, Transaction Costs			$ 77
Regulated assets [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation or Processing	3,725	4,271
Public Utilities, Property, Plant and Equipment, Distribution	3,294	3,231
Public Utilities, Property, Plant and Equipment, Transmission	1,860	1,846
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	784	738
Public Utilities, Property, Plant and Equipment, Plant in Service, Excluding Construction Work In Progress	9,663	10,086
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	2,840	3,205
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 6,823	$ 6,881
Regulated assets [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	30 years	30 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	20 years	20 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life	45 years	45 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	5 years	5 years
Regulated assets [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	55 years	55 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	65 years	65 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life	65 years	65 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	65 years	65 years
Unregulated asset [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 2	$ 2
Unregulated asset [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	45 years	45 years
Unregulated asset [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	45 years	45 years

Property, Plant and Equipment68

Property, Plant and Equipment, Net Property, Plant and Equipment, Net - SPPC (Details) - Sierra Pacific Power Company [Member] - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 2,750	$ 2,715
Public Utilities, Property, Plant and Equipment, Net	2,862	2,822
Common Facilities [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	112	107
Public Utilities, Property, Plant and Equipment, Net	2,862	2,822
Regulated assets [Member] | Electricity Generation Plant, Non-Nuclear [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation or Processing	1,140	1,137
Public Utilities, Property, Plant and Equipment, Distribution	1,445	1,417
Public Utilities, Property, Plant and Equipment, Transmission	782	771
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	$ 182	$ 164
Regulated assets [Member] | Electricity Generation Plant, Non-Nuclear [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	25 years	25 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	20 years	20 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life	50 years	50 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	5 years	5 years
Regulated assets [Member] | Electricity Generation Plant, Non-Nuclear [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	60 years	60 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	100 years	100 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life	100 years	100 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	70 years	70 years
Regulated assets [Member] | Natural Gas Processing Plant [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution	$ 388	$ 381
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	$ 14	$ 15
Regulated assets [Member] | Natural Gas Processing Plant [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	35 years	35 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	5 years	5 years
Regulated assets [Member] | Natural Gas Processing Plant [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	70 years	70 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	70 years	70 years
Regulated assets [Member] | Common Facilities [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Common	$ 290	$ 267
Public Utilities, Property, Plant and Equipment, Plant in Service, Excluding Construction Work In Progress	4,241	4,152
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	1,496	1,442
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 2,745	$ 2,710
Regulated assets [Member] | Common Facilities [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Common, Useful Life	5 years	5 years
Regulated assets [Member] | Common Facilities [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Common, Useful Life	70 years	70 years
Unregulated asset [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 5	$ 5
Unregulated asset [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	70 years	70 years
Unregulated asset [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	70 years	70 years
Electricity Generation Plant, Non-Nuclear [Member]
Property, Plant and Equipment [Line Items]
Change in Accounting Estimates, Impact on Future Periods			$ 9
Change in Accounting Estimate, Amount Deferred to Future Periods		$ 7

Regulatory Matters Regulatory M

Regulatory Matters Regulatory Matters - NPC (Details) $ in Millions	1 Months Ended
	May 31, 2017USD ($)	Mar. 31, 2017USD ($)MW	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)	Dec. 31, 2016USD ($)
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory assets				$ 4,582	$ 4,307
Nevada Power Company [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Regulatory assets				$ 1,110	$ 1,000
Nevada Power Company [Member] | 257 Megawatts of Coal Energy [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Coal-Fired Power Plant Capacity | MW		257
Regulatory assets		$ 151
Nevada Power Company [Member] | Public Utilities Commission, Nevada [Member] | MGM Resorts International [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Total impact fee			$ 82
Impact Fee Credit	$ 16
Nevada Power Company [Member] | Public Utilities Commission, Nevada [Member] | Wynn Las Vegas, LLC [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Total impact fee			$ 15
Nevada Power Company [Member] | Public Utilities Commission, Nevada [Member] | Switch, Ltd. [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Total impact fee	$ 27

Regulatory Matters Regulatory70

Regulatory Matters Regulatory Matters - SPPC (Details) - Sierra Pacific Power Company [Member] - General Rate Case [Member] - Public Utilities Commission, Nevada [Member]	12 Months Ended
	Dec. 31, 2016USD ($)MW
Schedule Of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	$ 0
Net Metering Capacity | MW	6
Electric Distribution [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 3,000,000
Gas Distribution [Member]
Schedule Of Regulatory Assets and Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 2,000,000

Investments and Restricted Ca71

Investments and Restricted Cash and Investments (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Investments [Abstract]
Investments	$ 2,650	$ 1,694
Equity Method Investments [Abstract]
Equity method investments	1,795	1,720
Restricted Cash and Investments [Abstract]
Restricted cash and investments	815	742
Investments, including equity method investments and restricted cash and investments	5,260	4,156
Investments, including equity method investments and restricted cash and investments, current	273	211
Investments, including equity method investments and restricted cash and investments, noncurrent	4,987	3,945
Quad Cities Station nuclear decommissioning trust funds [Member]
Restricted Cash and Investments [Abstract]
Decommissioning fund investments, fair value	498	460
Other restricted cash and investments [Member]
Restricted Cash and Investments [Abstract]
Restricted cash and investments	317	282
Equity Method Investments, tax equity investments [Member]
Equity Method Investments [Abstract]
Equity method investments	804	741
ETT [Member]
Equity Method Investments [Abstract]
Equity method investments	693	672
Bridger Coal Company [Member]
Equity Method Investments [Abstract]
Equity method investments	140	165
Other equity method investments [Member]
Equity Method Investments [Abstract]
Equity method investments	158	142
BYD Company Limited common stock [Member]
Investments [Abstract]
Available-for-sale securities, equity securities	2,087	1,185
Available-for-sale securities, gross unrealized gain (loss)	1,855	953
Rabbi trusts [Member]
Investments [Abstract]
Rabbi trusts, amount	431	403
Other investments [Member]
Investments [Abstract]
Other investments	$ 132	$ 106

Recent Financing Transactions R

Recent Financing Transactions Recent Financing Transactions - Long-Term Debt (Details) £ in Millions, $ in Millions	1 Months Ended	6 Months Ended
	Jul. 31, 2017GBP (£)	Jun. 30, 2017USD ($)shares	Sep. 30, 2017USD ($)	Jul. 31, 2017USD ($)	Jul. 31, 2017GBP (£)	May 31, 2017USD ($)	Apr. 01, 2017USD ($)	Feb. 28, 2017USD ($)
Northern Powergrid Holdings [Member] | Secured amortizing corporate facility, due June 2026 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount | £					£ 200
Proceeds from Issuance of Debt | £	£ 120
Percent of interest rate swaps that fix the underlying interest rate on outstanding debt				85.00%	85.00%
BHE [Member] | BHE Junior Subordinated Debentures, due 2044 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount			$ 944
BHE [Member] | BHE Junior Subordinated Debentures, due June 2057 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 100
Debt Instrument, Interest Rate, Stated Percentage		5.00%
Conversion of Stock, Shares Converted | shares		181,819
HomeServices [Member] | Unsecured amortizing term loan, $250 million, due September 2022 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			$ 250
Alamo 6, LLC [Member] | Alamo 6, LLC Senior Secured Notes, 4.17%, due March 2018 through March 2042 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount						$ 232
Debt Instrument, Interest Rate, Stated Percentage						4.17%
MidAmerican Energy Company and Subsidiaries [Member] | MEC First Mortgage Bonds, 3.10%, Due May 2027 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount								$ 375
Debt Instrument, Interest Rate, Stated Percentage								3.10%
MidAmerican Energy Company and Subsidiaries [Member] | MEC First Mortgage Bonds, 3.95%, Due 2047 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount								$ 475
Debt Instrument, Interest Rate, Stated Percentage								3.95%
MidAmerican Energy Company and Subsidiaries [Member] | MEC Notes, 5.95% Series, due 2017 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage								5.95%
Debt Instrument, Repurchased Face Amount								$ 250
Subsidiary Debt [Member] | Cordova Funding Corporation [Member] | Cordova Funding Corporation Bonds, 8.48% to 9.07%, due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount				$ 89
Subsidiary Debt [Member] | CE Generation, LLC [Member] | CE Generation Bonds 7.416% due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				7.416%	7.416%
Debt Instrument, Repurchased Face Amount				$ 51
Subsidiary Debt [Member] | Salton Sea Funding Corporation [Member] | Salton Sea Funding Corporation Bonds 7.475% due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				7.475%	7.475%
Debt Instrument, Repurchased Face Amount				$ 20
Subsidiary Debt [Member] | Kern River [Member] | Kern River Senior Notes, 4.893%, Due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage							4.893%
Debt Instrument, Repurchased Face Amount							$ 175
Subsidiary Debt [Member] | Minimum [Member] | Cordova Funding Corporation [Member] | Cordova Funding Corporation Bonds, 8.48% to 9.07%, due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				8.48%	8.48%
Subsidiary Debt [Member] | Maximum [Member] | Cordova Funding Corporation [Member] | Cordova Funding Corporation Bonds, 8.48% to 9.07%, due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				9.07%	9.07%
Subsidiary Debt [Member] | MidAmerican Funding [Member] | MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.10%, Due May 2027 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount								$ 375
Debt Instrument, Interest Rate, Stated Percentage								3.10%
Subsidiary Debt [Member] | MidAmerican Funding [Member] | MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.95%, Due 2047 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount								$ 475
Debt Instrument, Interest Rate, Stated Percentage								3.95%
Subsidiary Debt [Member] | MidAmerican Funding [Member] | MidAmerican Energy Company [Member] | MEC Notes, 5.95% Series, due 2017 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage								5.95%

Recent Financing Transactions73

Recent Financing Transactions Recent Financings Transactions - Credit Facilities (Details) - Line of Credit [Member] $ in Millions	Sep. 30, 2017USD ($)	Jun. 30, 2017USD ($)	May 31, 2017USD ($)
HomeServices [Member] | Unsecured credit facility, $350 million, expiring July 2018 [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity replaced	$ 350
HomeServices [Member] | Unsecured credit facility, $600 million, expiring September 2022 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 600
Sierra Pacific Power Company [Member] | Secured credit facility, $250 million, expiring June 2020 [Domain]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 250
MidAmerican Energy Company [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio	0.65
MidAmerican Energy Company [Member] | Unsecured credit facility, $600 million, expiring March 2018 [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity replaced		600
Line of Credit Facility, Maximum Borrowing Capacity	$ 600
MidAmerican Energy Company [Member] | Unsecured credit facility, $900 million, expiring March 2020 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	900	900
BHE [Member] | Unsecured credit facility, $2 billion, expiring June 2020 [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity replaced	$ 2,000
BHE [Member] | Unsecured credit facility, $1 billion, expiring May 2018 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 1,000
PacifiCorp [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio	0.65
PacifiCorp [Member] | Unsecured credit facility, $400 million, expiring June 2020 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 400
PacifiCorp [Member] | Unsecured credit facility, $600 million, expiring March 2018 [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity replaced		600
Line of Credit Facility, Maximum Borrowing Capacity	600
PacifiCorp [Member] | Unsecured credit facility, $600 million, expiring June 2020 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 600	600
Nevada Power Company [Member] | Secured credit facility, $400 million, expiring June 2020 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 400
Maximum [Member] | Sierra Pacific Power Company [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio	0.65
Maximum [Member] | MidAmerican Energy Company [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio	0.65
Maximum [Member] | BHE [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio	0.70
Maximum [Member] | PacifiCorp [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio	0.65
Maximum [Member] | Nevada Power Company [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio	0.65

Recent Financing Transactions74

Recent Financing Transactions Recent Financing Transactions - MEC (Details) - MidAmerican Energy Company [Member] $ in Millions	Feb. 28, 2017USD ($)
MEC First Mortgage Bonds, 3.10%, Due May 2027 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 375
Debt Instrument, Interest Rate, Stated Percentage	3.10%
MEC First Mortgage Bonds, 3.95%, Due 2047 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 475
Debt Instrument, Interest Rate, Stated Percentage	3.95%
MEC Notes, 5.95% Series, due 2017 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.95%
Debt Instrument, Repurchased Face Amount	$ 250

Recent Financing Transactions75

Recent Financing Transactions Recent Financing Transactions - NPC (Details) - Nevada Power Company [Member] - USD ($) $ in Millions	Jun. 30, 2017	May 31, 2017	Jan. 31, 2017
Pollution Control Revenue Bonds, Variable-Rate, Series 2006 due 2036 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount			$ 38
Pollution Control Revenue Bonds, Variable-Rate, Series 2006A due 2032 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount			$ 38
Line of Credit [Member] | Secured credit facility, $400 million, expiring June 2020 [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 400
NVE Holdings [Member] | Pollution Control Revenue Bonds, Variable-Rate, Series 2006 due 2036 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount		$ 39.5
NVE Holdings [Member] | Pollution Control Revenue Bonds, Variable-Rate, Series 2006A due 2032 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount		40
NVE Holdings [Member] | Pollution Control Refunding Revenue Bonds, 1.60%, Series 2017, Due 2036 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 39.5
Debt Instrument, Interest Rate, Stated Percentage		1.60%
NVE Holdings [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.80%, Series 2017A, due 2032 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 40
Debt Instrument, Interest Rate, Stated Percentage		1.80%
NVE Holdings [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.60%, Series 2017B, due 2039 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 13
Debt Instrument, Interest Rate, Stated Percentage		1.60%
NVE Holdings [Member] | NPC General and Refunding Mortgage Notes, Series AA, No. AA-1 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 39.5
NVE Holdings [Member] | NPC General and Refunding Mortgage Notes, Series AA, No. AA-2 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		53
NVE Holdings [Member] | Pollution Control Revenue Bonds, Variable-Rate, Series 2006B due 2036 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount		$ 13

Recent Financing Transactions76

Recent Financing Transactions Recent Financing Transactions - SPPC (Details) $ in Millions	Jun. 30, 2017USD ($)
Secured credit facility, $250 million, expiring June 2020 [Domain] | Line of Credit [Member] | Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 250

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	35.00%	35.00%	35.00%	35.00%
Income tax credits	(19.00%)	(16.00%)	(18.00%)	(15.00%)
State income tax, net of federal income tax benefit	0.00%	0.00%	(1.00%)	0.00%
Income tax effect of foreign income	(3.00%)	(3.00%)	(4.00%)	(4.00%)
Equity income	1.00%	1.00%	1.00%	1.00%
Other, net	1.00%	(1.00%)	(0.00%)	(0.00%)
Effective income tax rate	15.00%	16.00%	13.00%	17.00%
Production Tax Credit Carryforwards [Abstract]
Years eligible for federal renewable energy production tax credit			10 years
Related Party Tax Expense [Abstract]
Related party transaction, cash received for income taxes, net			$ 659	$ 860

Income Taxes - MEC (Details)

Income Taxes - MEC (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	35.00%	35.00%	35.00%	35.00%
Income tax credits	(19.00%)	(16.00%)	(18.00%)	(15.00%)
State income tax, net of federal income tax benefit	0.00%	0.00%	(1.00%)	0.00%
Other, net	1.00%	(1.00%)	(0.00%)	(0.00%)
Effective income tax rate	15.00%	16.00%	13.00%	17.00%
Production Tax Credit Carryforwards [Abstract]
Years eligible for federal renewable energy production tax credit			10 years
Related Party Income Tax Receivable (Payable) [Abstract]
Related party transaction, cash received for income taxes, net			$ 659	$ 860
MidAmerican Energy Company [Member]
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	35.00%	35.00%	35.00%	35.00%
Income tax credits	(74.00%)	(58.00%)	(74.00%)	(58.00%)
State income tax, net of federal income tax benefit	(10.00%)	(6.00%)	(7.00%)	(4.00%)
Effects of ratemaking	(2.00%)	(1.00%)	(4.00%)	(3.00%)
Other, net	(1.00%)	(0.00%)	(0.00%)	(0.00%)
Effective income tax rate	(52.00%)	(30.00%)	(50.00%)	(30.00%)
Production Tax Credit Carryforwards [Abstract]
Years eligible for federal renewable energy production tax credit			10 years
MidAmerican Energy Company [Member] | Berkshire Hathaway Energy [Member]
Related Party Income Tax Receivable (Payable) [Abstract]
Related party transaction, cash received for income taxes, net			$ 381	$ 416

Income Taxes - MidAmerican Fund

Income Taxes - MidAmerican Funding (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	35.00%	35.00%	35.00%	35.00%
Income tax credits	(19.00%)	(16.00%)	(18.00%)	(15.00%)
State income tax, net of federal income tax benefit	0.00%	0.00%	(1.00%)	0.00%
Other, net	1.00%	(1.00%)	(0.00%)	(0.00%)
Effective income tax rate	15.00%	16.00%	13.00%	17.00%
Production Tax Credit Carryforwards [Abstract]
Years eligible for federal renewable energy production tax credit			10 years
Related Party Income Tax Receivable (Payable) [Abstract]
Related party transaction, cash received for income taxes, net			$ 659	$ 860
MidAmerican Funding, LLC and Subsidiaries [Domain]
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	35.00%	35.00%	35.00%	35.00%
Income tax credits	(76.00%)	(60.00%)	(76.00%)	(61.00%)
State income tax, net of federal income tax benefit	(10.00%)	(7.00%)	(8.00%)	(4.00%)
Effects of ratemaking	(2.00%)	(0.00%)	(4.00%)	(3.00%)
Effective income tax rate	(53.00%)	(32.00%)	(53.00%)	(33.00%)
Production Tax Credit Carryforwards [Abstract]
Years eligible for federal renewable energy production tax credit			10 years
MidAmerican Funding, LLC and Subsidiaries [Domain] | Berkshire Hathaway Energy [Member]
Related Party Income Tax Receivable (Payable) [Abstract]
Related party transaction, cash received for income taxes, net			$ 386	$ 422

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3	$ 2	$ 7	$ 7
Interest cost	7	7	21	23
Expected return on plan assets	(9)	(10)	(30)	(31)
Net amortization	(3)	(2)	(10)	(9)
Net periodic benefit cost	(2)	(3)	(12)	(10)
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	7	18	22
Interest cost	29	31	87	94
Expected return on plan assets	(40)	(39)	(120)	(120)
Net amortization	7	12	22	36
Net periodic benefit cost	2	11	7	32
UNITED KINGDOM | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	5	19	16
Interest cost	15	17	44	55
Expected return on plan assets	(25)	(27)	(74)	(85)
Defined Benefit Plan, Plan Assets, Payment for Settlement	18	0	18	0
Net amortization	17	11	50	34
Net periodic benefit cost	$ 31	$ 6	$ 57	$ 20

Employee Benefit Plans - Employ

Employee Benefit Plans - Employer Contributions (Details) - 9 months ended Sep. 30, 2017 £ in Millions, $ in Millions	USD ($)	GBP (£)	GBP (£)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	$ 5
Employer contributions	5
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	15
Employer contributions	9
UNITED KINGDOM | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year | £			£ 45
Employer contributions	$ 43	£ 34

Employee Benefit Plans Employee

Employee Benefit Plans Employee Benefit Plans - PacifiCorp (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3	$ 2	$ 7	$ 7
Interest cost	7	7	21	23
Expected return on plan assets	(9)	(10)	(30)	(31)
Net amortization	(3)	(2)	(10)	(9)
Net periodic benefit cost	(2)	(3)	(12)	(10)
PacifiCorp [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	2	2
Interest cost	3	3	10	11
Expected return on plan assets	(5)	(5)	(16)	(16)
Net amortization	(1)	(1)	(4)	(4)
Net periodic benefit cost	(2)	(2)	(8)	(7)
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	7	18	22
Interest cost	29	31	87	94
Expected return on plan assets	(40)	(39)	(120)	(120)
Net amortization	7	12	22	36
Net periodic benefit cost	2	11	7	32
Domestic Plan [Member] | PacifiCorp [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1	0	3
Interest cost	12	14	37	41
Expected return on plan assets	(18)	(18)	(54)	(56)
Net amortization	3	8	10	25
Net periodic benefit cost	$ (3)	$ 5	$ (7)	$ 13

Employee Benefit Plans Employ83

Employee Benefit Plans Employee Benefit Plans - PacifiCorp - Employer Contributions (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017USD ($)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	$ 5
Employer contributions	5
PacifiCorp [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	0
Employer contributions	0
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	15
Employer contributions	9
Domestic Plan [Member] | PacifiCorp [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	5
Employer contributions	$ 3

Employee Benefit Plans - MEC (D

Employee Benefit Plans - MEC (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3	$ 2	$ 7	$ 7
Interest cost	7	7	21	23
Expected return on plan assets	(9)	(10)	(30)	(31)
Net amortization	(3)	(2)	(10)	(9)
Net periodic benefit cost	(2)	(3)	(12)	(10)
MidAmerican Energy Company [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	1	4	4
Interest cost	3	2	7	7
Expected return on plan assets	(3)	(3)	(10)	(10)
Net amortization	(1)	(1)	(3)	(3)
Net periodic benefit cost	1	(1)	(2)	(2)
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	7	18	22
Interest cost	29	31	87	94
Expected return on plan assets	(40)	(39)	(120)	(120)
Net amortization	7	12	22	36
Net periodic benefit cost	2	11	7	32
Domestic Plan [Member] | MidAmerican Energy Company [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	3	7	8
Interest cost	8	8	23	25
Expected return on plan assets	(11)	(11)	(33)	(33)
Net amortization	0	0	1	1
Net periodic benefit cost	$ (1)	$ 0	$ (2)	$ 1

Employee Benefit Plans Employ85

Employee Benefit Plans Employee Benefit Plans - MEC - Employer Contributions (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017USD ($)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	$ 5
Employer contributions	5
MidAmerican Energy Company [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	1
Employer contributions	1
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	15
Employer contributions	9
Domestic Plan [Member] | MidAmerican Energy Company [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	8
Employer contributions	$ 5

Employee Benefit Plans - NPC -

Employee Benefit Plans - NPC - Amounts Payable (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 5
Nevada Power Company [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	1
Nevada Power Company [Member] | Other Noncurrent Liabilities [Member] | NV Energy, Inc. [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Noncurrent	(4)	$ (4)
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	9
Domestic Plan [Member] | Nevada Power Company [Member] | Other Noncurrent Liabilities [Member] | NV Energy, Inc. [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Noncurrent	(27)	(24)
Domestic Plan [Member] | Nevada Power Company [Member] | Other Noncurrent Liabilities [Member] | NV Energy, Inc. [Member] | Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Noncurrent	(9)	(9)
Domestic Plan [Member] | Nevada Power Company [Member] | Other Current Liabilities [Member] | NV Energy, Inc. [Member] | Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Current	$ 1	$ 1

Employee Benefit Plans - SPPC -

Employee Benefit Plans - SPPC - Amounts Payable (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 5
Sierra Pacific Power Company [Member] | NV Energy, Inc. [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	4
Sierra Pacific Power Company [Member] | Other Noncurrent Liabilities [Member] | NV Energy, Inc. [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Noncurrent	25	$ 28
Domestic Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	9
Domestic Plan [Member] | Sierra Pacific Power Company [Member] | Other Noncurrent Liabilities [Member] | NV Energy, Inc. [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Noncurrent	13	12
Domestic Plan [Member] | Sierra Pacific Power Company [Member] | Other Noncurrent Liabilities [Member] | NV Energy, Inc. [Member] | Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Noncurrent	9	9
Domestic Plan [Member] | Sierra Pacific Power Company [Member] | Other Current Liabilities [Member] | NV Energy, Inc. [Member] | Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Plan, Current	$ 1	$ 1

Risk Management and Hedging A88

Risk Management and Hedging Activities - Balance Sheet Location (Details) - USD ($) $ in Millions	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	$ (80)		$ (77)
Cash collateral, net receivable, offset against derivative positions	85		74
Derivative assets (liabilities), at fair value, net	5		(3)
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	37		48
Cash collateral, net receivable, offset against derivative positions	0		0
Derivative assets (liabilities), at fair value, net	37		48
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	99		94
Cash collateral, net receivable, offset against derivative positions	0		0
Derivative assets (liabilities), at fair value, net	99		94
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(66)		(60)
Cash collateral, net receivable, offset against derivative positions	21		13
Derivative assets (liabilities), at fair value, net	(45)		(47)
Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(150)		(159)
Cash collateral, net receivable, offset against derivative positions	64		61
Derivative assets (liabilities), at fair value, net	(86)		(98)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(65)		(66)
Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	37		47
Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	93		86
Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(56)		(45)
Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(139)		(154)
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(15)		(11)
Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	0		1
Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	6		8
Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(10)		(15)
Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(11)		(5)
Commodity derivative [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	119		135
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(196)		(206)
Derivative, fair value, net	(77)		(71)
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts	162	$ 162	148	$ 195	$ 185	$ 250
Commodity derivative [Member] | Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	16		42
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(1)		(10)
Commodity derivative [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	93		86
Derivative liability, fair value, gross liability including not subject to master netting arrangement	0		0
Commodity derivative [Member] | Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	7		5
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(60)		(46)
Commodity derivative [Member] | Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	3		2
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(135)		(150)
Commodity derivative [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	8		6
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(28)		(22)
Commodity derivative [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	0		1
Derivative liability, fair value, gross liability including not subject to master netting arrangement	0		0
Commodity derivative [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	0		0
Derivative liability, fair value, gross liability including not subject to master netting arrangement	0		0
Commodity derivative [Member] | Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	2		2
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(11)		(14)
Commodity derivative [Member] | Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	6		3
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(17)		(8)
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	22		15
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(10)		(10)
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	22		15
Derivative liability, fair value, gross liability including not subject to master netting arrangement	0		0
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	0		0
Derivative liability, fair value, gross liability including not subject to master netting arrangement	0		0
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	0		0
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(3)		(4)
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	0		0
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(7)		(6)
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	6		8
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(1)		(3)
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	0		0
Derivative liability, fair value, gross liability including not subject to master netting arrangement	0		0
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	6		8
Derivative liability, fair value, gross liability including not subject to master netting arrangement	0		0
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	0		0
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(1)		(3)
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	0		0
Derivative liability, fair value, gross liability including not subject to master netting arrangement	$ 0		$ 0

Risk Management and Hedging A89

Risk Management and Hedging Activities - Not Designated as Hedging Contracts (Details) - Not Designated as Hedging Instrument [Member] - Commodity derivative [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Regulatory Assets (Liabilities), Net, Derivatives [Roll Forward]
Beginning balance	$ 162	$ 185	$ 148	$ 250
Changes in fair value recognized in net regulatory assets	10	18	43	5
Net (losses) gains reclassified to operating revenue	(5)	(3)	9	(6)
Net losses reclassified to cost of sales	(5)	(5)	(38)	(54)
Ending balance	$ 162	$ 195	$ 162	$ 195

Risk Management and Hedging A90

Risk Management and Hedging Activities - Designated as Hedging Contracts (Details) - Designated as Hedging Instrument [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive (Income) Loss, Net, Derivatives [Roll Forward]
Cash flow hedge ineffectiveness	insignificant	insignificant	insignificant	insignificant
Cash flow hedge loss to be reclassified within twelve months			$ 10
Commodity derivative [Member]
Accumulated Other Comprehensive (Income) Loss, Net, Derivatives [Roll Forward]
Beginning balance	$ 21	$ 26	16	$ 46
Changes in fair value recognized in OCI	5	15	28	35
Cash Flow Hedge Gain (Loss), Net, Reclassified to Revenue	0	1	0	1
Net losses reclassified to cost of sales	(7)	(7)	(25)	(47)
Ending balance	$ 19	$ 35	$ 19	$ 35

Risk Management and Hedging A91

Risk Management and Hedging Activities - Derivative Contract Volumes (Details) £ in Millions, gal in Millions, MWh in Millions, Dth in Millions, $ in Millions	Sep. 30, 2017USD ($)MWhgalDth	Sep. 30, 2017GBP (£)MWhgalDth	Dec. 31, 2016USD ($)MWhgalDth	Dec. 31, 2016GBP (£)MWhgalDth
Electricity purchases (in megawatt hours) [Member] | Commodity derivative [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | MWh	9	9	5	5
Natural gas purchases (in decatherms) [Member] | Commodity derivative [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | Dth	339	339	271	271
Fuel purchases (in gallons) [Member] | Commodity derivative [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | gal	2	2	11	11
Mortgage sale commitments, net [Member] | Interest Rate Contract [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, notional amount	$ (442)		$ (309)
United States of America, Dollars | Interest rate swap [Member] | Interest Rate Contract [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, notional amount	$ (694)		$ (714)
United Kingdom, Pounds | Interest rate swap [Member] | Interest Rate Contract [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, notional amount | £		£ (102)		£ 0

Risk Management and Hedging A92

Risk Management and Hedging Activities - Collateral and Contingent Features (Details) - Commodity derivative [Member] - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Derivative, net liability position, aggregate fair value	$ 190	$ 190
Collateral already posted, aggregate fair value	73	69
Additional collateral, aggregate fair value	$ 105	$ 110

Risk Management and Hedging A93

Risk Management and Hedging Activities - PacifiCorp - Balance Sheet Location (Details) - USD ($) $ in Millions	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	$ (80)		$ (77)
Cash collateral, net receivable, offset against derivative positions	85		74
Derivative assets (liabilities), at fair value, net	5		(3)
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	37		48
Cash collateral, net receivable, offset against derivative positions	0		0
Derivative assets (liabilities), at fair value, net	37		48
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	99		94
Cash collateral, net receivable, offset against derivative positions	0		0
Derivative assets (liabilities), at fair value, net	99		94
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(66)		(60)
Cash collateral, net receivable, offset against derivative positions	21		13
Derivative assets (liabilities), at fair value, net	(45)		(47)
Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(150)		(159)
Cash collateral, net receivable, offset against derivative positions	64		61
Derivative assets (liabilities), at fair value, net	(86)		(98)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(65)		(66)
Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	37		47
Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	93		86
Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(56)		(45)
Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(139)		(154)
Commodity derivative [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	119		135
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(196)		(206)
Derivative, fair value, net	(77)		(71)
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts	162	$ 162	148	$ 195	$ 185	$ 250
Commodity derivative [Member] | Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	16		42
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(1)		(10)
Commodity derivative [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	93		86
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	0		0
Commodity derivative [Member] | Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	7		5
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(60)		(46)
Commodity derivative [Member] | Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	3		2
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(135)		(150)
PacifiCorp [Member] | Commodity derivative [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(100)		(77)
Cash collateral, net receivable, offset against derivative positions	73		69
Derivative assets (liabilities), at fair value, net	(27)		(8)
PacifiCorp [Member] | Commodity derivative [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	3		18
Cash collateral, net receivable, offset against derivative positions	0		0
Derivative assets (liabilities), at fair value, net	3		18
PacifiCorp [Member] | Commodity derivative [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	1		2
Cash collateral, net receivable, offset against derivative positions	0		0
Derivative assets (liabilities), at fair value, net	1		2
PacifiCorp [Member] | Commodity derivative [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(22)		(13)
Cash collateral, net receivable, offset against derivative positions	16		10
Derivative assets (liabilities), at fair value, net	(6)		(3)
PacifiCorp [Member] | Commodity derivative [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(82)		(84)
Cash collateral, net receivable, offset against derivative positions	57		59
Derivative assets (liabilities), at fair value, net	(25)		(25)
PacifiCorp [Member] | Commodity derivative [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	7		27
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(107)		(104)
Derivative, fair value, net	(100)		(77)
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts	97	$ 95	73	$ 102	$ 89	$ 133
PacifiCorp [Member] | Commodity derivative [Member] | Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	4		24
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(1)		(6)
Derivative, fair value, net	3		18
PacifiCorp [Member] | Commodity derivative [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	1		2
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	0		0
Derivative, fair value, net	1		2
PacifiCorp [Member] | Commodity derivative [Member] | Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	2		1
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(24)		(14)
Derivative, fair value, net	(22)		(13)
PacifiCorp [Member] | Commodity derivative [Member] | Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	0		0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(82)		(84)
Derivative, fair value, net	$ (82)		$ (84)

Risk Management and Hedging A94

Risk Management and Hedging Activities - PacifiCorp - Not Designated as Hedging Contracts (Details) - Not Designated as Hedging Instrument [Member] - Commodity derivative [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Instruments [Line Items]
Beginning balance	$ 162	$ 185	$ 148	$ 250
Changes in fair value recognized in net regulatory assets	10	18	43	5
Net (losses) gains reclassified to operating revenue	(5)	(3)	9	(6)
Ending balance	162	195	162	195
PacifiCorp [Member]
Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Instruments [Line Items]
Beginning balance	95	89	73	133
Changes in fair value recognized in net regulatory assets	6	15	36	(4)
Net (losses) gains reclassified to operating revenue	(5)	(2)	8	8
Net Gains (Losses) Reclassified To Cost Of Domestic Regulated Electric	1	0	(20)	(35)
Ending balance	$ 97	$ 102	$ 97	$ 102

Risk Management and Hedging A95

Risk Management and Hedging Activities - PacifiCorp - Derivative Contract Volumes (Details) - Commodity derivative [Member] gal in Millions, MWh in Millions, Dth in Millions	Sep. 30, 2017MWhgalDth	Dec. 31, 2016MWhgalDth
Electricity purchases (in megawatt hours) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | MWh	(9)	(5)
Natural gas purchases (in decatherms) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | Dth	(339)	(271)
Fuel purchases (in gallons) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | gal	(2)	(11)
PacifiCorp [Member] | Electricity purchases (in megawatt hours) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | MWh	(3)	(3)
PacifiCorp [Member] | Natural gas purchases (in decatherms) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | Dth	(97)	(84)
PacifiCorp [Member] | Fuel purchases (in gallons) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | gal	(2)	(11)

Risk Management and Hedging A96

Risk Management and Hedging Activities - PacifiCorp - Collateral and Contingent Features (Details) - Commodity derivative [Member] - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Derivative, net liability position, aggregate fair value	$ 190	$ 190
Collateral already posted, aggregate fair value	73	69
Additional collateral, aggregate fair value	105	110
PacifiCorp [Member]
Derivative [Line Items]
Derivative, net liability position, aggregate fair value	102	97
Collateral already posted, aggregate fair value	73	69
Additional collateral, aggregate fair value	$ 26	$ 22

Risk Management and Hedging A97

Risk Management and Hedging Activities - MEC - Balance Sheet Location (Details) - USD ($) $ in Millions	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	$ (80)		$ (77)
Cash collateral, net receivable, offset against derivative positions	85		74
Derivative assets (liabilities), at fair value, net	5		(3)
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	37		48
Cash collateral, net receivable, offset against derivative positions	0		0
Derivative assets (liabilities), at fair value, net	37		48
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	99		94
Cash collateral, net receivable, offset against derivative positions	0		0
Derivative assets (liabilities), at fair value, net	99		94
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(66)		(60)
Cash collateral, net receivable, offset against derivative positions	21		13
Derivative assets (liabilities), at fair value, net	(45)		(47)
Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(150)		(159)
Cash collateral, net receivable, offset against derivative positions	64		61
Derivative assets (liabilities), at fair value, net	(86)		(98)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(65)		(66)
Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	37		47
Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	93		86
Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(56)		(45)
Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(139)		(154)
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(15)		(11)
Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	0		1
Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	6		8
Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(10)		(15)
Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(11)		(5)
Commodity derivative [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	119		135
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	196		206
Derivative, fair value, net	(77)		(71)
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts	162	$ 162	148	$ 195	$ 185	$ 250
Commodity derivative [Member] | Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	16		42
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	1		10
Commodity derivative [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	93		86
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	0		0
Commodity derivative [Member] | Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	7		5
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	60		46
Commodity derivative [Member] | Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	3		2
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	135		150
Commodity derivative [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	8		6
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	28		22
Commodity derivative [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	0		1
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	0		0
Commodity derivative [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	0		0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	0		0
Commodity derivative [Member] | Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	2		2
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	11		14
Commodity derivative [Member] | Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	6		3
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	$ 17		$ 8

Risk Management and Hedging A98

Risk Management and Hedging Activities - MEC - Not Designated as Hedging Contracts (Details) - Not Designated as Hedging Instrument [Member] - Commodity derivative [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Regulatory Assets (Liabilities), Net, Derivatives [Roll Forward]
Beginning balance	$ 162	$ 185	$ 148	$ 250
Changes in fair value recognized in net regulatory assets	10	18	43	5
Net (losses) gains reclassified to operating revenue	(5)	(3)	9	(6)
Ending balance	$ 162	$ 195	$ 162	$ 195

Risk Management and Hedging A99

Risk Management and Hedging Activities - MEC - Designated as Hedging Contracts (Details) - Commodity derivative [Member] - Designated as Hedging Instrument [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive (Income) Loss, Net, Derivatives [Roll Forward]
Accumulated other comprehensive income (loss), net, cummulative net gain (loss) from cash flow hedges, effect before taxes	$ (21)	$ (26)	$ (16)	$ (46)
Changes in fair value recognized in OCI	5	15	28	35
Accumulated other comprehensive income (loss), net, cummulative net gain (loss) from cash flow hedges, effect before taxes	$ (19)	$ (35)	$ (19)	$ (35)

Risk Management and Hedging 100

Risk Management and Hedging Activities - MEC - Derivative Contract Volumes (Details) - Commodity derivative [Member] MWh in Millions, Dth in Millions	Sep. 30, 2017MWhDth	Dec. 31, 2016MWhDth
Electricity purchases (in megawatt hours) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | MWh	9	5
Natural gas purchases (in decatherms) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | Dth	339	271

Risk Management and Hedging 101

Risk Management and Hedging Activities - MEC - Collateral and Contingent Features (Details) - Commodity derivative [Member] - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Collateral already posted, aggregate fair value	$ 73	$ 69
Derivative, net liability position, aggregate fair value	190	190
Additional collateral, aggregate fair value	$ 105	$ 110

Risk Management and Hedging 102

Risk Management and Hedging Activities - NPC - Balance Sheet Location (Details) - Commodity derivative [Member] - USD ($) $ in Millions		Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016		Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts		$ 162	$ 162	$ 148		$ 195	$ 185	$ 250
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		196		206
Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		60		46
Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		135		150
Nevada Power Company [Member] | Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	[1]	3		7
Nevada Power Company [Member] | Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	[1]	1		7
Recurring [Member] | Nevada Power Company [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		4		14
Recurring [Member] | Level 3 [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		16		27
Recurring [Member] | Level 3 [Member] | Nevada Power Company [Member]
Derivatives, Fair Value [Line Items]
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts		4		14	[1]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	[1]	$ 4		$ 14
[1]	(1)Nevada Power's commodity derivatives not designated as hedging contracts are included in regulated rates and as of September 30, 2017 and December 31, 2016, a regulatory asset of $4 million and $14 million, respectively, was recorded related to the derivative liability of $4 million and $14 million, respectively.

Risk Management and Hedging 103

Risk Management and Hedging Activities - NPC - Derivative Contract Volumes (Details) - Commodity derivative [Member] MWh in Millions, Dth in Millions	Sep. 30, 2017MWhDth	Dec. 31, 2016MWhDth
Electricity purchases (in megawatt hours) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | MWh	9	5
Natural gas purchases (in decatherms) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | Dth	339	271
Nevada Power Company [Member] | Electricity purchases (in megawatt hours) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | MWh	0	2
Nevada Power Company [Member] | Natural gas purchases (in decatherms) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | Dth	149	114

Risk Management and Hedging 104

Risk Management and Hedging Activities - NPC - Collateral and Contingent Features (Details) - Commodity derivative [Member] - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Derivative, net liability position, aggregate fair value	$ 190	$ 190
Nevada Power Company [Member]
Derivative [Line Items]
Derivative, net liability position, aggregate fair value	$ 2	$ 2

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash collateral, net receivable, offset against derivative positions	$ 85		$ 85			$ 74
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(19)		(19)			(22)
Assets, fair value disclosure	4,284		4,284			2,878
Derivative liability, fair value, gross asset and right to reclaim cash, offset	104		104			96
Derivative liabilities	(131)		(131)			(145)
Cash collateral, net receivable, offset against derivative positions	85		85			74
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	3,570		3,570			2,339
Derivative liabilities	(1)		(1)			(3)
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	617		617			467
Derivative liabilities	(217)		(217)			(210)
Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	116		116			94
Derivative liabilities	(17)		(17)			(28)
Mortgage Loans on Real Estate [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	534		534			359
Mortgage Loans on Real Estate [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			0
Mortgage Loans on Real Estate [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	534		534			359
Mortgage Loans on Real Estate [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			0
Money market mutual funds [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	855		855			586
Money market mutual funds [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	855		855			586
Money market mutual funds [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			0
Money market mutual funds [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			0
United States government obligations [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	168		168			161
United States government obligations [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	168		168			161
United States government obligations [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			0
United States government obligations [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			0
International government obligations [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	5		5			3
International government obligations [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			0
International government obligations [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	5		5			3
International government obligations [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			0
Corporate obligations [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	37		37			36
Corporate obligations [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			0
Corporate obligations [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	37		37			36
Corporate obligations [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			0
Municipal obligations [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2		2			2
Municipal obligations [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			0
Municipal obligations [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2		2			2
Municipal obligations [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			0
Agency, asset and mortgage-backed obligations [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1		1			2
Agency, asset and mortgage-backed obligations [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			0
Agency, asset and mortgage-backed obligations [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1		1			2
Agency, asset and mortgage-backed obligations [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			0
United States companies [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	270		270			250
United States companies [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	270		270			250
United States companies [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			0
United States companies [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			0
International companies [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2,094		2,094			1,190
International companies [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2,094		2,094			1,190
International companies [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			0
International companies [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			0
Investment funds [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	182		182			147
Investment funds [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	182		182			147
Investment funds [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			0
Investment funds [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0			0
Commodity derivative [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(19)		(19)			(22)
Derivative assets	108		108			119
Derivative liability, fair value, gross asset and right to reclaim cash, offset	104		104			96
Derivative liabilities	(120)		(120)			(132)
Commodity derivative [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	1		1			5
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(1)		(1)			(2)
Commodity derivative [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	24		24			49
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(207)		(207)			(199)
Commodity derivative [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	102		102			87
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(16)		(16)			(27)
Interest Rate Contract [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	28		28			23
Derivative liabilities	(11)		(11)			(13)
Interest Rate Contract [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	0		0			0
Derivative liability, fair value, gross liability including not subject to master netting arrangement	0		0			(1)
Interest Rate Contract [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	14		14			16
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(10)		(10)			(11)
Interest Rate Contract [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	14		14			7
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(1)		(1)			(1)
Commodity derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset (Liability), Net, Value	86	$ 56	86	$ 56	$ 81	60	$ 44	$ 47
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	(7)	(9)	(19)	(8)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included in Other Comprehensive Income (Loss)	1	2	3	2
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net	3	1	5	12
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	1	1	1
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Assets and Liability, Net, Settlements	(2)	(5)	(14)	(14)
Interest Rate Lock Commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset (Liability), Net, Value	13	11	13	11	8	6	14	4
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	(34)	(49)	(100)	(103)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included in Other Comprehensive Income (Loss)	0	0	0	0
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	8	0	6	0
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Assets and Liability, Net, Settlements	37	52	99	96
Auction rate securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset (Liability), Net, Value	0	18	0	18	$ 0	$ 0	$ 18	$ 44
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included in Other Comprehensive Income (Loss)	0	0	0	(6)
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	0	0	0
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Assets and Liability, Net, Settlements	$ 0	$ 0	$ 0	$ 0

Fair Value Measurements - Level

Fair Value Measurements - Level 3 (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Commodity derivative [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 81	$ 44	$ 60	$ 47
Changes included in earnings	7	9	19	8
Changes in fair value recognized in other comprehensive income	(1)	(2)	(3)	(2)
Changes in fair value recognized in net regulatory assets	(3)	(1)	(5)	(12)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	1	1	1
Fair value, level 3, asset, sales		0		0
Settlements	2	5	14	14
Ending balance	86	56	86	56
Interest Rate Lock Commitments [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	8	14	6	4
Changes included in earnings	34	49	100	103
Changes in fair value recognized in other comprehensive income	0	0	0	0
Changes in fair value recognized in net regulatory assets	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	8	0	6	0
Fair value, level 3, asset, sales		0		0
Settlements	(37)	(52)	(99)	(96)
Ending balance	13	11	13	11
Auction rate securities [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0	18	0	44
Changes included in earnings	0	0	0	0
Changes in fair value recognized in other comprehensive income	0	0	0	6
Changes in fair value recognized in net regulatory assets	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	0	0	0
Fair value, level 3, asset, sales		0		(32)
Settlements	0	0	0	0
Ending balance	$ 0	$ 18	$ 0	$ 18

Fair Value Measurements - Debt

Fair Value Measurements - Debt (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 36,124	$ 36,116
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 41,197	$ 40,718

Fair Value Measurements - Pacif

Fair Value Measurements - PacifiCorp (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash collateral, net receivable, offset against derivative positions	$ 85	$ 74
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(19)	(22)
Assets, fair value disclosure	4,284	2,878
Derivative liability, fair value, gross asset and right to reclaim cash, offset	104	96
Derivative Liability	(131)	(145)
Cash collateral, net receivable, offset against derivative positions	85	74
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	3,570	2,339
Derivative Liability	(1)	(3)
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	617	467
Derivative Liability	(217)	(210)
Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	116	94
Derivative Liability	(17)	(28)
Commodity derivative [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(19)	(22)
Derivative assets	108	119
Derivative liability, fair value, gross asset and right to reclaim cash, offset	104	96
Derivative Liability	(120)	(132)
Commodity derivative [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	1	5
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(1)	(2)
Commodity derivative [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	24	49
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(207)	(199)
Commodity derivative [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	102	87
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(16)	(27)
Money market mutual funds [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	855	586
Money market mutual funds [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	855	586
Money market mutual funds [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Money market mutual funds [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Investment funds [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	182	147
Investment funds [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	182	147
Investment funds [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Trading Securities		0
Investment funds [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Trading Securities		0
PacifiCorp [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	124	50
PacifiCorp [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	120	30
PacifiCorp [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	7	27
PacifiCorp [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	0	0
PacifiCorp [Member] | Commodity derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash collateral, net receivable, offset against derivative positions	73	69
PacifiCorp [Member] | Commodity derivative [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	(3)	(7)
Derivative assets	4	20
Derivative liability, fair value, gross asset and right to reclaim cash, offset	76	76
Derivative Liability	(31)	(28)
Cash collateral, net receivable, offset against derivative positions	73	69
PacifiCorp [Member] | Commodity derivative [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	0	0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	0	0
PacifiCorp [Member] | Commodity derivative [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	7	27
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(107)	(104)
PacifiCorp [Member] | Commodity derivative [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement	0	0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	0	0
PacifiCorp [Member] | Money market mutual funds [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	100	13
PacifiCorp [Member] | Money market mutual funds [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	100	13
PacifiCorp [Member] | Money market mutual funds [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
PacifiCorp [Member] | Money market mutual funds [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
PacifiCorp [Member] | Investment funds [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	20	17
PacifiCorp [Member] | Investment funds [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	20	17
PacifiCorp [Member] | Investment funds [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	0	0
PacifiCorp [Member] | Investment funds [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	$ 0	$ 0

Fair Value Measurements - Pa109

Fair Value Measurements - PacifiCorp - Debt (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 36,124	$ 36,116
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	41,197	40,718
PacifiCorp [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	7,005	7,052
PacifiCorp [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 8,277	$ 8,204

Fair Value Measurements - MEC (

Fair Value Measurements - MEC (Details) - USD ($) $ in Millions		Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash collateral, net receivable, offset against derivative positions		$ 85	$ 74
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash collateral, net receivable, offset against derivative positions		85	74
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		(19)	(22)
Assets, fair value disclosure		4,284	2,878
Derivative liability, fair value, gross asset and right to reclaim cash, offset		104	96
Recurring [Member] | Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		855	586
Recurring [Member] | United States government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		168	161
Recurring [Member] | International government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		5	3
Recurring [Member] | Corporate obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		37	36
Recurring [Member] | Municipal obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		2	2
Recurring [Member] | Agency, asset and mortgage-backed obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		1	2
Recurring [Member] | United States companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		270	250
Recurring [Member] | International companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		2,094	1,190
Recurring [Member] | Investment funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		182	147
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		3,570	2,339
Recurring [Member] | Level 1 [Member] | Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		855	586
Recurring [Member] | Level 1 [Member] | United States government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		168	161
Recurring [Member] | Level 1 [Member] | International government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Recurring [Member] | Level 1 [Member] | Corporate obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Recurring [Member] | Level 1 [Member] | Municipal obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Recurring [Member] | Level 1 [Member] | Agency, asset and mortgage-backed obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Recurring [Member] | Level 1 [Member] | United States companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		270	250
Recurring [Member] | Level 1 [Member] | International companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		2,094	1,190
Recurring [Member] | Level 1 [Member] | Investment funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		182	147
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		617	467
Recurring [Member] | Level 2 [Member] | Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Recurring [Member] | Level 2 [Member] | United States government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Recurring [Member] | Level 2 [Member] | International government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		5	3
Recurring [Member] | Level 2 [Member] | Corporate obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		37	36
Recurring [Member] | Level 2 [Member] | Municipal obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		2	2
Recurring [Member] | Level 2 [Member] | Agency, asset and mortgage-backed obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		1	2
Recurring [Member] | Level 2 [Member] | United States companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Recurring [Member] | Level 2 [Member] | International companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Recurring [Member] | Level 2 [Member] | Investment funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Trading Securities			0
Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		116	94
Recurring [Member] | Level 3 [Member] | Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Recurring [Member] | Level 3 [Member] | United States government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Recurring [Member] | Level 3 [Member] | International government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Recurring [Member] | Level 3 [Member] | Corporate obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Recurring [Member] | Level 3 [Member] | Municipal obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Recurring [Member] | Level 3 [Member] | Agency, asset and mortgage-backed obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Recurring [Member] | Level 3 [Member] | United States companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Recurring [Member] | Level 3 [Member] | International companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Recurring [Member] | Level 3 [Member] | Investment funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Trading Securities			0
Commodity derivative [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		(19)	(22)
Derivative liability, fair value, gross asset and right to reclaim cash, offset		104	96
Commodity derivative [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement		1	5
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(1)	(2)
Commodity derivative [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement		24	49
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(207)	(199)
Commodity derivative [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement		102	87
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(16)	(27)
MidAmerican Energy Company [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash collateral, net receivable, offset against derivative positions		0	1
Assets, fair value disclosure		1,027	477
MidAmerican Energy Company [Member] | Recurring [Member] | Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	520	1
MidAmerican Energy Company [Member] | Recurring [Member] | United States government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		168	161
MidAmerican Energy Company [Member] | Recurring [Member] | International government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		5	3
MidAmerican Energy Company [Member] | Recurring [Member] | Corporate obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		37	36
MidAmerican Energy Company [Member] | Recurring [Member] | Municipal obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		2	2
MidAmerican Energy Company [Member] | Recurring [Member] | Agency, asset and mortgage-backed obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		1	2
MidAmerican Energy Company [Member] | Recurring [Member] | United States companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		270	250
MidAmerican Energy Company [Member] | Recurring [Member] | International companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		7	5
MidAmerican Energy Company [Member] | Recurring [Member] | Investment funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		15	9
MidAmerican Energy Company [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		980	426
MidAmerican Energy Company [Member] | Recurring [Member] | Level 1 [Member] | Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	520	1
MidAmerican Energy Company [Member] | Recurring [Member] | Level 1 [Member] | United States government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		168	161
MidAmerican Energy Company [Member] | Recurring [Member] | Level 1 [Member] | International government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
MidAmerican Energy Company [Member] | Recurring [Member] | Level 1 [Member] | Corporate obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
MidAmerican Energy Company [Member] | Recurring [Member] | Level 1 [Member] | Municipal obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
MidAmerican Energy Company [Member] | Recurring [Member] | Level 1 [Member] | Agency, asset and mortgage-backed obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
MidAmerican Energy Company [Member] | Recurring [Member] | Level 1 [Member] | United States companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		270	250
MidAmerican Energy Company [Member] | Recurring [Member] | Level 1 [Member] | International companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		7	5
MidAmerican Energy Company [Member] | Recurring [Member] | Level 1 [Member] | Investment funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		15	9
MidAmerican Energy Company [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		47	52
MidAmerican Energy Company [Member] | Recurring [Member] | Level 2 [Member] | Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	0	0
MidAmerican Energy Company [Member] | Recurring [Member] | Level 2 [Member] | United States government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
MidAmerican Energy Company [Member] | Recurring [Member] | Level 2 [Member] | International government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		5	3
MidAmerican Energy Company [Member] | Recurring [Member] | Level 2 [Member] | Corporate obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		37	36
MidAmerican Energy Company [Member] | Recurring [Member] | Level 2 [Member] | Municipal obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		2	2
MidAmerican Energy Company [Member] | Recurring [Member] | Level 2 [Member] | Agency, asset and mortgage-backed obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		1	2
MidAmerican Energy Company [Member] | Recurring [Member] | Level 2 [Member] | United States companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
MidAmerican Energy Company [Member] | Recurring [Member] | Level 2 [Member] | International companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
MidAmerican Energy Company [Member] | Recurring [Member] | Level 2 [Member] | Investment funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0
MidAmerican Energy Company [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		2	1
MidAmerican Energy Company [Member] | Recurring [Member] | Level 3 [Member] | Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]	0	0
MidAmerican Energy Company [Member] | Recurring [Member] | Level 3 [Member] | United States government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
MidAmerican Energy Company [Member] | Recurring [Member] | Level 3 [Member] | International government obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
MidAmerican Energy Company [Member] | Recurring [Member] | Level 3 [Member] | Corporate obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
MidAmerican Energy Company [Member] | Recurring [Member] | Level 3 [Member] | Municipal obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
MidAmerican Energy Company [Member] | Recurring [Member] | Level 3 [Member] | Agency, asset and mortgage-backed obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
MidAmerican Energy Company [Member] | Recurring [Member] | Level 3 [Member] | United States companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
MidAmerican Energy Company [Member] | Recurring [Member] | Level 3 [Member] | International companies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
MidAmerican Energy Company [Member] | Recurring [Member] | Level 3 [Member] | Investment funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0
MidAmerican Energy Company [Member] | Commodity derivative [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement		2	8
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[2]	(2)	(2)
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(8)	(3)
Derivative liability, fair value, gross asset and right to reclaim cash, offset	[2]	2	3
MidAmerican Energy Company [Member] | Commodity derivative [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement		0	0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0	0
MidAmerican Energy Company [Member] | Commodity derivative [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement		2	9
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(6)	(3)
MidAmerican Energy Company [Member] | Commodity derivative [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, fair value, gross asset including not subject to master netting arrangement		2	1
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		$ (4)	$ (3)
[1]	Amounts are included in cash and cash equivalents and investments and restricted cash and investments on the Balance Sheets. The fair value of these money market mutual funds approximates cost.
[2]	Represents netting under master netting arrangements and a net cash collateral receivable of $- million and $1 million as of September 30, 2017 and December 31, 2016, respectively.

Fair Value Measurements - MEC -

Fair Value Measurements - MEC - Level 3 (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Derivative [Member] | MidAmerican Energy Company [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ (1)	$ (2)	$ (2)	$ (6)
Fair value, level 3, transferred to affiliate		0		(4)
Changes in fair value recognized in other comprehensive income		0		0
Changes in fair value recognized in net regulatory assets	(2)	(1)	(2)	(5)
Fair value, level 3, asset, sales		0		0
Settlements	1	1	2	13
Ending balance	(2)	(2)	(2)	(2)
Auction rate securities [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0	18	0	44
Changes included in earnings	0	0	0	0
Changes in fair value recognized in other comprehensive income	0	0	0	6
Changes in fair value recognized in net regulatory assets	0	0	0	0
Purchases	0	0	0	0
Fair value, level 3, asset, sales		0		(32)
Settlements	0	0	0	0
Ending balance	0	18	0	18
Auction rate securities [Member] | MidAmerican Energy Company [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0	18	0	26
Fair value, level 3, transferred to affiliate		0		0
Changes in fair value recognized in other comprehensive income		0		3
Changes in fair value recognized in net regulatory assets	0	0	0	0
Fair value, level 3, asset, sales		0		(11)
Settlements	0	0	0	0
Ending balance	$ 0	$ 18	$ 0	$ 18

Fair Value Measurements - ME112

Fair Value Measurements - MEC - Debt (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 36,124	$ 36,116
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	41,197	40,718
MidAmerican Energy Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	4,894	4,301
Long-term debt, fair value		$ 4,735
MidAmerican Energy Company [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 5,446

Fair Value Measurements - MidAm

Fair Value Measurements - MidAmerican Funding - Debt (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 36,124	$ 36,116
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	41,197	40,718
MidAmerican Funding, LLC and Subsidiaries [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	5,220	4,627
Long-term debt, fair value		$ 5,164
MidAmerican Funding, LLC and Subsidiaries [Domain] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 5,873

Fair Value Measurements - NPC (

Fair Value Measurements - NPC (Details) - Recurring [Member] - USD ($) $ in Millions		Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		$ 4,284	$ 2,878
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		3,570	2,339
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		617	467
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		116	94
Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		855	586
Money market mutual funds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		855	586
Money market mutual funds [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Money market mutual funds [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Investment funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		182	147
Investment funds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		182	147
Investment funds [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Investment funds [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Commodity derivative [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		1	2
Commodity derivative [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		207	199
Commodity derivative [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		16	27
Nevada Power Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure			226
Nevada Power Company [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure			226
Nevada Power Company [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure			0
Nevada Power Company [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure			0
Nevada Power Company [Member] | Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]		220
Nevada Power Company [Member] | Money market mutual funds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]		220
Nevada Power Company [Member] | Money market mutual funds [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]		0
Nevada Power Company [Member] | Money market mutual funds [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]		0
Nevada Power Company [Member] | Investment funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities			6
Assets, fair value disclosure		2
Nevada Power Company [Member] | Investment funds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities			6
Assets, fair value disclosure		2
Nevada Power Company [Member] | Investment funds [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities			0
Assets, fair value disclosure		0
Nevada Power Company [Member] | Investment funds [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities			0
Assets, fair value disclosure		0
Nevada Power Company [Member] | Commodity derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		4	14
Nevada Power Company [Member] | Commodity derivative [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0	0
Nevada Power Company [Member] | Commodity derivative [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0	0
Nevada Power Company [Member] | Commodity derivative [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	[2]	$ 4	$ 14
[1]	Amounts are included in cash and cash equivalents on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.
[2]	(1)Nevada Power's commodity derivatives not designated as hedging contracts are included in regulated rates and as of September 30, 2017 and December 31, 2016, a regulatory asset of $4 million and $14 million, respectively, was recorded related to the derivative liability of $4 million and $14 million, respectively.

Fair Value Measurements - NPC -

Fair Value Measurements - NPC - Level 3 (Details) - Nevada Power Company [Member] - Commodity [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ (4)	$ (22)	$ (14)	$ (22)
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net	1	1	3	6
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Assets and Liability, Net, Settlements	(1)	(4)	(13)	(9)
Ending balance	$ (4)	$ (19)	$ (4)	$ (19)

Fair Value Measurements - NP116

Fair Value Measurements - NPC - Debt (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 36,124	$ 36,116
Nevada Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	2,599	2,581
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	41,197	40,718
Level 2 [Member] | Nevada Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 3,055	$ 3,040

Fair Value Measurements Fair Va

Fair Value Measurements Fair Value Measurements - SPPC (Details) - Recurring [Member] - USD ($) $ in Millions		Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		$ 4,284	$ 2,878
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		3,570	2,339
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		617	467
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		116	94
Investment funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		182	147
Investment funds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		182	147
Investment funds [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Investment funds [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		855	586
Money market mutual funds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		855	586
Money market mutual funds [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Money market mutual funds [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Sierra Pacific Power Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure			36
Sierra Pacific Power Company [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure			36
Sierra Pacific Power Company [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure			0
Sierra Pacific Power Company [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure			0
Sierra Pacific Power Company [Member] | Investment funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	1
Sierra Pacific Power Company [Member] | Investment funds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	1
Sierra Pacific Power Company [Member] | Investment funds [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0	0
Sierra Pacific Power Company [Member] | Investment funds [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		$ 0	0
Sierra Pacific Power Company [Member] | Money market mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]		35
Sierra Pacific Power Company [Member] | Money market mutual funds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]		35
Sierra Pacific Power Company [Member] | Money market mutual funds [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]		0
Sierra Pacific Power Company [Member] | Money market mutual funds [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[1]		$ 0
[1]	(1)Amounts are included in cash and cash equivalents on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.

Fair Value Measurements - SPPC

Fair Value Measurements - SPPC - Debt (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 36,124	$ 36,116
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	41,197	40,718
Sierra Pacific Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	1,120	1,119
Sierra Pacific Power Company [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 1,201	$ 1,191

Commitments and Contingencies -

Commitments and Contingencies - Commitments (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017USD ($)
MidAmerican Energy Company [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Operating Leases, Future Minimum Payments Due	$ 114
PacifiCorp [Member] | Klamath Hydroelectric System [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Dam removal cost limit	200
PacifiCorp [Member] | Klamath Hydroelectric System [Member] | OREGON
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Dam removal cost limit	184
PacifiCorp [Member] | Klamath Hydroelectric System [Member] | CALIFORNIA
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Dam removal cost limit	16
Additional dam removal costs, California bond measure	250
Natural Gas Contracts For Resale [Member] | MidAmerican Energy Company [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Purchase Obligation, Due Through Fifth Year	247
Purchase Obligation, Due after Fifth Year	70
Capital Addition Purchase Commitments [Member] | MidAmerican Energy Company [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Purchase Obligation	675
Purchase Obligation, Due in Next Twelve Months	84
Purchase Obligation, Due in Second Year	340
Purchase Obligation, Due in Third Year	$ 8

Commitments and Contingencies C

Commitments and Contingencies Commitments and Contingencies - PacifiCorp - Hydroelectric (Details) - PacifiCorp [Member] - Klamath Hydroelectric System [Member] $ in Millions	9 Months Ended
	Sep. 30, 2017USD ($)
Hydroelectric [Line Items]
Dam removal cost limit	$ 200
OREGON
Hydroelectric [Line Items]
Dam removal cost limit	184
CALIFORNIA
Hydroelectric [Line Items]
Additional dam removal costs, California bond measure	250
Dam removal cost limit	$ 16

Commitments and Contingencie121

Commitments and Contingencies Commitments and Contingencies - MEC- Commitments (Details) - MidAmerican Energy Company [Member] $ in Millions	Sep. 30, 2017USD ($)
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Operating Leases, Future Minimum Payments Due	$ 114
Natural Gas Contracts For Resale [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Purchase Obligation, Due Through Fifth Year	247
Purchase Obligation, Due after Fifth Year	70
Capital Addition Purchase Commitments [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Purchase Obligation	675
Purchase Obligation, Due in Next Twelve Months	84
Purchase Obligation, Due in Second Year	340
Purchase Obligation, Due in Third Year	$ 8

Commitments and Contingencie122

Commitments and Contingencies Commitments and Contingencies - MEC - Transmission Rates (Details) - MidAmerican Energy Company [Member] - Electric Transmission [Member] $ in Millions	9 Months Ended
	Sep. 30, 2017USD ($)
Loss Contingencies [Line Items]
Public Utilities, Approved Return on Equity Adder, Percentage	0.50%
Unfavorable Regulatory Action [Member]
Loss Contingencies [Line Items]
Accrued liability for estimated transmission billings refunds	$ 9
Prior to September 2016 [Member]
Loss Contingencies [Line Items]
Public Utilities, Approved Return on Equity, Percentage	12.38%
November 2013 to February 2015 [Member]
Loss Contingencies [Line Items]
Public Utilities, Approved Return on Equity, Percentage	10.32%
Public Utilities, Intervenor Proposed Return On Equity, Percentage	9.15%
February 2015 through May 2016 [Member]
Loss Contingencies [Line Items]
Public Utilities, Intervenor Proposed Return On Equity, Percentage	8.67%

Commitments and Contingencie123

Commitments and Contingencies Commitments and Contingencies - NPC - Environmental Laws and Regulations (Details) - Nevada Power Company [Member] - MW	1 Months Ended		9 Months Ended	12 Months Ended
	Apr. 30, 2017	Mar. 31, 2017	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
300 Megawatts of Coal Energy [Member]
Supply Commitment [Line Items]
Coal-Fired Power Plant Capacity						300
257 Megawatts of Coal Energy [Member]
Supply Commitment [Line Items]
Coal-Fired Power Plant Capacity		257
812 Megawatts of Coal Energy [Member]
Supply Commitment [Line Items]
Coal-Fired Power Plant Capacity			812
272 Megawatts of Natural Gas Energy [Member]
Supply Commitment [Line Items]
New Generation Capacity						272
210 Megawatts of Natural Gas Energy [Member]
Supply Commitment [Line Items]
New Generation Capacity						210
15 Megawatts of Solar Renewable Energy [Member]
Supply Commitment [Line Items]
New Generation Capacity					15
100 Megawatts of Solar Renewable Energy [Member]
Supply Commitment [Line Items]
New Generation Capacity				100	100
130 Megawatts of Natural Gas Energy [Member]
Supply Commitment [Line Items]
New Generation Capacity	130
Ownership Percentage Acquired	25.00%
54 Megawatts of Natural Gas Energy [Member]
Supply Commitment [Line Items]
New Generation Capacity	54
35 Megawatts of Renewable Energy [Member]
Supply Commitment [Line Items]
New Generation Capacity			35

Components of Accumulated Ot124

Components of Accumulated Other Comprehensive Loss, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - Accumulated other comprehensive loss, net			$ (1,511)
Other comprehensive income (loss), unrecognized amounts on retirement benefits	$ 15	$ 18	16	$ 80
Other comprehensive income (loss), foreign currency translation adjustment	227	(134)	535	(339)
Other comprehensive income (loss), unrealized gains on available-for-sale securities	423	80	542	151
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges	1	(3)	(5)	(2)
Other comprehensive income (loss)	666	(39)	1,088	(110)
Ending balance - Accumulated other comprehensive loss, net	(423)		(423)
Accumulated Other Comprehensive (Loss) Income, Net [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - unrecognized amounts on retirement benefits			(447)	(438)
Beginning balance - foreign currency translation adjustment			(1,675)	(1,092)
Beginning balance - unrealized gains (losses) on available-for-sale securities			585	615
Beginning balance - unrealized gains (losses) on cash flow hedges			26	7
Beginning balance - Accumulated other comprehensive loss, net			(1,511)	(908)
Other comprehensive income (loss), unrecognized amounts on retirement benefits			16	80
Other comprehensive income (loss), foreign currency translation adjustment			535	(339)
Other comprehensive income (loss), unrealized gains on available-for-sale securities			542	151
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges			(5)	(2)
Other comprehensive income (loss)			1,088	(110)
Ending balance - unrecognized amounts on retirement benefits	(431)	(358)	(431)	(358)
Ending balance - foreign currency translation adjustment	(1,140)	(1,431)	(1,140)	(1,431)
Ending balance - unrealized gains (losses) on available-for-sale securities	1,127	766	1,127	766
Ending balance - unrealized gains (losses) on cash flow hedges	21	5	21	5
Ending balance - Accumulated other comprehensive loss, net	$ (423)	$ (1,018)	$ (423)	$ (1,018)

Components of Accumulated Ot125

Components of Accumulated Other Comprehensive Loss, Net - MEC (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - Accumulated other comprehensive loss, net			$ (1,511)
Other comprehensive income (loss), unrealized gains on available-for-sale securities	$ 423	$ 80	542	$ 151
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges	1	(3)	(5)	(2)
Other comprehensive income (loss)	666	(39)	1,088	(110)
Ending balance - Accumulated other comprehensive loss, net	(423)		(423)
Accumulated Other Comprehensive (Loss) Income, Net [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - unrealized gains (losses) on available-for-sale securities			585	615
Beginning balance - unrealized gains (losses) on cash flow hedges			26	7
Beginning balance - Accumulated other comprehensive loss, net			(1,511)	(908)
Other comprehensive income (loss), unrealized gains on available-for-sale securities			542	151
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges			(5)	(2)
Other comprehensive income (loss)			1,088	(110)
Ending balance - unrealized gains (losses) on available-for-sale securities	1,127	766	1,127	766
Ending balance - unrealized gains (losses) on cash flow hedges	21	5	21	5
Ending balance - Accumulated other comprehensive loss, net	$ (423)	(1,018)	$ (423)	(1,018)
MidAmerican Energy Company [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Other comprehensive income (loss)				2
Dividend, unrealized losses on cash flow hedges, transfer of operations				(90)
MidAmerican Energy Company [Member] | Accumulated Other Comprehensive (Loss) Income, Net [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - unrealized gains (losses) on available-for-sale securities				(3)
Beginning balance - unrealized gains (losses) on cash flow hedges				(27)
Beginning balance - Accumulated other comprehensive loss, net				(30)
Other comprehensive income (loss), unrealized gains on available-for-sale securities				2
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges				0
Other comprehensive income (loss)				2
Dividend, unrealized losses on cash flow hedges, transfer of operations				(27)
Ending balance - unrealized gains (losses) on available-for-sale securities		(1)		(1)
Ending balance - unrealized gains (losses) on cash flow hedges		0		0
Ending balance - Accumulated other comprehensive loss, net		$ (1)		$ (1)

Segment Information (Details)

Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenues	$ 5,283	$ 5,092	$ 14,003	$ 13,254
Sales revenue from energy operations	4,322	4,272	11,501	11,102
Real estate	961	820	2,502	2,152
Depreciation and amortization - energy operations	(635)	(639)	(1,905)	(1,898)
Depreciation and amortization	651	648	1,943	1,922
Operating income	1,624	1,585	3,644	3,392
Interest expense	464	460	1,379	1,401
Interest Costs Capitalized Adjustment	14	14	34	128
Allowance for equity funds	24	17	59	147
Interest and dividend income	32	39	85	93
Other, net	2	15	24	26
Income before income tax expense and equity income	1,232	1,210	2,467	2,385
Assets	91,054		91,054		$ 85,440
PacifiCorp [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	1,430	1,434	3,956	3,919
Depreciation and amortization - energy operations	(200)	(193)	(598)	(589)
Operating income	467	445	1,150	1,108
Interest expense	95	95	285	286
Assets	23,578		23,578		23,563
MidAmerican Funding [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	815	797	2,170	2,008
Depreciation and amortization - energy operations	(112)	(118)	(370)	(338)
Operating income	288	284	531	524
Interest expense	59	55	177	164
Assets	19,019		19,019		17,571
NV Energy, Inc. [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	1,047	987	2,384	2,309
Depreciation and amortization - energy operations	(105)	(106)	(315)	(315)
Operating income	393	394	682	656
Interest expense	57	60	173	190
Assets	14,344		14,344		14,320
Northern Powergrid [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	221	220	685	748
Depreciation and amortization - energy operations	(55)	(49)	(156)	(149)
Operating income	81	90	308	373
Interest expense	34	33	98	105
Assets	7,280		7,280		6,433
BHE Pipeline Group [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	193	201	700	704
Depreciation and amortization - energy operations	(42)	(53)	(115)	(160)
Operating income	65	68	328	320
Interest expense	11	13	33	39
Assets	4,958		4,958		5,144
BHE Transmission [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	182	169	506	309
Depreciation and amortization - energy operations	(58)	(61)	(165)	(177)
Operating income	86	81	236	35
Interest expense	45	40	125	114
Assets	9,182		9,182		8,378
BHE Renewables [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	283	273	647	582
Depreciation and amortization - energy operations	(63)	(57)	(187)	(169)
Operating income	157	157	256	233
Interest expense	51	51	153	148
Assets	7,492		7,492		7,010
HomeServices [Member]
Segment Reporting Information [Line Items]
Real estate	961	820	2,502	2,152
Depreciation and amortization	16	9	38	24
Operating income	79	87	191	179
Interest expense	1	1	3	2
Assets	2,834		2,834		1,776
BHE And Other [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	151	191	453	523
Depreciation and amortization - energy operations	0	(2)	1	(1)
Operating income	8	(21)	(38)	(36)
Interest expense	111	112	332	353
Assets	2,367		2,367		$ 1,245
UNITED STATES
Segment Reporting Information [Line Items]
Revenues	4,869	4,697	12,793	12,185
Income before income tax expense and equity income	1,113	1,089	2,065	1,945
UNITED KINGDOM
Segment Reporting Information [Line Items]
Revenues	221	220	685	748
Income before income tax expense and equity income	49	74	213	284
CANADA
Segment Reporting Information [Line Items]
Revenues	182	170	506	313
Income before income tax expense and equity income	47	43	127	114
The Philippines and other [Member]
Segment Reporting Information [Line Items]
Revenues	11	5	19	8
Income before income tax expense and equity income	$ 23	$ 4	$ 62	$ 42

Segment Information - Goodwill

Segment Information - Goodwill (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 9,010
Acquisitions	522
Foreign currency translation	170
Other	(2)
Ending balance	9,700
PacifiCorp [Member]
Goodwill [Roll Forward]
Beginning balance	1,129
Acquisitions	0
Foreign currency translation	0
Other	0
Ending balance	1,129
MidAmerican Funding [Member]
Goodwill [Roll Forward]
Beginning balance	2,102
Acquisitions	0
Foreign currency translation	0
Other	0
Ending balance	2,102
NV Energy, Inc. [Member]
Goodwill [Roll Forward]
Beginning balance	2,369
Acquisitions	0
Foreign currency translation	0
Other	0
Ending balance	2,369
Northern Powergrid [Member]
Goodwill [Roll Forward]
Beginning balance	930
Acquisitions	0
Foreign currency translation	56
Other	0
Ending balance	986
BHE Pipeline Group [Member]
Goodwill [Roll Forward]
Beginning balance	75
Acquisitions	0
Foreign currency translation	0
Other	(2)
Ending balance	73
BHE Transmission [Member]
Goodwill [Roll Forward]
Beginning balance	1,470
Acquisitions	0
Foreign currency translation	114
Other	0
Ending balance	1,584
BHE Renewables [Member]
Goodwill [Roll Forward]
Beginning balance	95
Acquisitions	0
Foreign currency translation	0
Other	0
Ending balance	95
HomeServices [Member]
Goodwill [Roll Forward]
Beginning balance	840
Acquisitions	522
Foreign currency translation	0
Other	0
Ending balance	$ 1,362

Segment Information Segment Inf

Segment Information Segment Information - MEC (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)OperatingSegmentsReportableSegments	Sep. 30, 2016USD ($)	Dec. 31, 2016USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | OperatingSegments			8
Revenues	$ 5,283	$ 5,092	$ 14,003	$ 13,254
Operating income	1,624	1,585	3,644	3,392
Assets	91,054		$ 91,054		$ 85,440
MidAmerican Energy Company [Member]
Segment Reporting Information [Line Items]
Number of reportable segments | ReportableSegments			2
Electric Domestic Regulated Revenue	707	692	$ 1,677	1,572
Revenues	813	795	2,166	2,004
Utilities Operating Expense, Depreciation and Amortization	111	118	369	338
Operating income	288	284	530	523
Assets	16,902		16,902		15,459
MidAmerican Energy Company [Member] | Regulated Electric [Member]
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue	707	692	1,677	1,572
Utilities Operating Expense, Depreciation and Amortization	101	107	338	306
Operating income	290	289	485	481
Assets	15,556		15,556		14,113
MidAmerican Energy Company [Member] | Regulated Gas [Member]
Segment Reporting Information [Line Items]
Gas Domestic Regulated Revenue	103	102	485	430
Utilities Operating Expense, Depreciation and Amortization	10	11	31	32
Operating income	(2)	(5)	45	42
Assets	1,339		1,339		1,345
MidAmerican Energy Company [Member] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Other Revenue, Net	3	$ 1	4	$ 2
Assets	$ 7		$ 7		$ 1

Segment Information Segment 129

Segment Information Segment Information - MidAmerican Funding (Details) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)OperatingSegmentsReportableSegments	Sep. 30, 2016USD ($)	Dec. 31, 2016USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | OperatingSegments				8
Revenues		$ 5,283	$ 5,092	$ 14,003	$ 13,254
Operating income		1,624	1,585	3,644	3,392
Assets		91,054		$ 91,054		$ 85,440
MidAmerican Funding, LLC and Subsidiaries [Domain]
Segment Reporting Information [Line Items]
Number of reportable segments | ReportableSegments				2
Electric Domestic Regulated Revenue		707	692	$ 1,677	1,572
Revenues		815	797	2,170	2,008
Utilities Operating Expense, Depreciation and Amortization		111	118	369	338
Operating income		288	284	531	524
Assets	[1]	18,196		18,196		16,747
MidAmerican Funding, LLC and Subsidiaries [Domain] | Regulated Electric [Member]
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue		707	692	1,677	1,572
Utilities Operating Expense, Depreciation and Amortization		101	107	338	306
Operating income		290	289	485	481
Assets	[1]	16,747		16,747		15,304
MidAmerican Funding, LLC and Subsidiaries [Domain] | Regulated Gas [Member]
Segment Reporting Information [Line Items]
Gas Domestic Regulated Revenue		103	102	485	430
Utilities Operating Expense, Depreciation and Amortization		10	11	31	32
Operating income		(2)	(5)	45	42
Assets	[1]	1,418		1,418		1,424
MidAmerican Funding, LLC and Subsidiaries [Domain] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Other Revenue, Net		5	3	8	6
Operating income		0	$ 0	1	$ 1
Assets	[1]	$ 31		$ 31		$ 19
[1]	(1)Consists principally of cash and cash equivalents not included in either the regulated electric or regulated natural gas segments.

Segment Information Segment 130

Segment Information Segment Information - SPPC (Details) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)OperatingSegmentsTheNumberOfReportableSegments	Sep. 30, 2016USD ($)	Dec. 31, 2016USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | OperatingSegments				8
Revenues		$ 5,283	$ 5,092	$ 14,003	$ 13,254
Cost of sales		1,212	1,187	3,380	3,252
Operating income		1,624	1,585	3,644	3,392
Interest expense		464	460	1,379	1,401
Assets		91,054		$ 91,054		$ 85,440
Sierra Pacific Power Company [Member]
Segment Reporting Information [Line Items]
Number of reportable segments | TheNumberOfReportableSegments				2
Electric Domestic Regulated Revenue		215	207	$ 534	539
Gas Domestic Regulated Revenue		15	15	66	81
Revenues		230	222	600	620
Cost of sales		76	73	193	208
Cost of Purchased Oil and Gas		4	5	26	42
Cost of Sales		80	78	219	250
Gross Margin		150	144	381	370
Utilities Operating Expense, Maintenance and Operations		40	40	121	126
Utilities Operating Expense, Depreciation and Amortization		29	30	85	88
Operating income		75	69	157	138
Interest expense		11	12	33	42
Assets		3,507		3,507		3,493
Sierra Pacific Power Company [Member] | Electric Operations [Member]
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue		215	207	534	539
Cost of sales		76	73	193	208
Gross Margin		139	134	341	331
Utilities Operating Expense, Maintenance and Operations		36	36	108	112
Utilities Operating Expense, Depreciation and Amortization		25	26	74	76
Operating income		72	68	142	127
Interest expense		10	11	30	38
Assets		3,165		3,165		3,119
Sierra Pacific Power Company [Member] | Natural Gas Operations [Member]
Segment Reporting Information [Line Items]
Gas Domestic Regulated Revenue		15	15	66	81
Cost of Purchased Oil and Gas		4	5	26	42
Gross Margin		11	10	40	39
Utilities Operating Expense, Maintenance and Operations		4	4	13	14
Utilities Operating Expense, Depreciation and Amortization		4	4	11	12
Operating income		3	1	15	11
Interest expense		1	$ 1	3	$ 4
Assets		305		305		314
Sierra Pacific Power Company [Member] | Regulated common assets [Member]
Segment Reporting Information [Line Items]
Assets	[1]	$ 37		$ 37		$ 60
[1]	(1)Consists principally of cash and cash equivalents not included in either the regulated electric or regulated natural gas segments.

Related Party Transactions R131

Related Party Transactions Related Party Transactions PacifiCorp (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Related Party Transaction [Line Items]
Related party transaction, cash received for income taxes, net	$ 659	$ 860
PacifiCorp [Member] | BHE [Member]
Related Party Transaction [Line Items]
Related party transaction, cash received for income taxes, net	$ 205	$ 61