Sierra Pacific Power 10-Q 6 May 16 2016 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	3 Months Ended
	Mar. 31, 2016	Apr. 30, 2016	Jun. 30, 2015
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q1
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		77,391,144
Entity Public Float			$ 0
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
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
Entity Public Float			0
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
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
Entity Public Float			0
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
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
Entity Public Float			0
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
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
Entity Public Float			$ 0
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 1,086	$ 1,108
Trade receivables, net	1,613	1,785
Income taxes receivable	329	319
Inventories	902	882
Mortgage loans held for sale	246	335
Other current assets	796	814
Total current assets	4,972	5,243
Property, plant and equipment, net	61,152	60,769
Goodwill	9,145	9,076
Regulatory assets	4,182	4,155
Investments and restricted cash and investments	3,719	3,367
Other assets	1,076	1,008
Total assets	84,246	83,618
Current liabilities:
Accounts payable	1,246	1,564
Accrued interest	486	469
Accrued property, income and other taxes	377	372
Accrued employee expenses	267	264
Regulatory Liability, Current	434	402
Short-term debt	1,722	974
Current portion of long-term debt	935	1,148
Other current liabilities	961	896
Total current liabilities	6,428	6,089
Regulatory liabilities	2,676	2,631
BHE senior debt	7,815	7,814
BHE junior subordinated debentures	2,444	2,944
Subsidiary debt	26,119	26,066
Deferred income taxes	12,797	12,685
Other long-term liabilities	2,843	2,854
Total liabilities	$ 61,122	$ 61,083
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	6,403	6,403
Retained earnings	17,396	16,906
Accumulated other comprehensive loss, net	(809)	(908)
Total BHE shareholders' equity	22,990	22,401
Noncontrolling interests	134	134
Total equity	23,124	22,535
Total liabilities and equity	84,246	83,618
PacifiCorp [Member]
Current assets:
Cash and cash equivalents	167	12
Income taxes receivable	0	17
Other current assets	78	81
Total current assets	1,389	1,377
Regulatory assets	1,580	1,583
Other assets	413	381
Total assets	22,418	22,367
Current liabilities:
Accounts payable	414	473
Accrued interest	106	115
Accrued property, income and other taxes	88	62
Accrued employee expenses	99	70
Regulatory Liability, Current	37	34
Short-term debt	0	20
Other current liabilities	234	229
Total current liabilities	1,110	1,071
Regulatory liabilities	948	938
Deferred income taxes	4,738	4,750
Other long-term liabilities	1,026	1,027
Total liabilities	$ 14,850	$ 14,864
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	4,479	4,479
Retained earnings	3,098	3,033
Accumulated other comprehensive loss, net	(11)	(11)
Total BHE shareholders' equity	7,568	7,503
Total liabilities and equity	$ 22,418	$ 22,367

Consolidated Balance Sheets - P

Consolidated Balance Sheets - PacifiCorp - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 1,086	$ 1,108
Income taxes receivable	329	319
Other current assets	796	814
Total current assets	4,972	5,243
Regulatory assets	4,182	4,155
Other assets	1,076	1,008
Total assets	84,246	83,618
Current liabilities:
Accounts payable	1,246	1,564
Accrued employee expenses	267	264
Accrued interest	486	469
Accrued property, income and other taxes	377	372
Short-term debt	1,722	974
Regulatory Liability, Current	434	402
Other current liabilities	961	896
Total current liabilities	6,428	6,089
Regulatory liabilities	2,676	2,631
Deferred income taxes	12,797	12,685
Other long-term liabilities	2,843	2,854
Total liabilities	$ 61,122	$ 61,083
Commitments and contingencies
Equity:
Common stock	$ 0	$ 0
Additional paid-in capital	6,403	6,403
Retained earnings	17,396	16,906
Accumulated other comprehensive loss, net	(809)	(908)
Total shareholder's equity	22,990	22,401
Total liabilities and equity	84,246	83,618
PacifiCorp [Member]
Current assets:
Cash and cash equivalents	167	12
Receivables, Net, Current	604	740
Income taxes receivable	0	17
Other Inventory, Supplies, Gross	231	233
Energy Related Inventory, Other Fossil Fuel	216	192
Regulatory Assets, Current	93	102
Other current assets	78	81
Total current assets	1,389	1,377
Public Utilities, Property, Plant and Equipment, Net	19,036	19,026
Regulatory assets	1,580	1,583
Other assets	413	381
Total assets	22,418	22,367
Current liabilities:
Accounts payable	414	473
Accrued Income Taxes, Current	67	0
Accrued employee expenses	99	70
Accrued interest	106	115
Accrued property, income and other taxes	88	62
Short-term debt	0	20
Long-term Debt and Capital Lease Obligations, Current	65	68
Regulatory Liability, Current	37	34
Other current liabilities	234	229
Total current liabilities	1,110	1,071
Regulatory liabilities	948	938
Long-term Debt and Capital Lease Obligations	7,028	7,078
Deferred income taxes	4,738	4,750
Other long-term liabilities	1,026	1,027
Total liabilities	$ 14,850	$ 14,864
Commitments and contingencies
Equity:
Preferred Stock, Value, Issued	$ 2	$ 2
Common stock	0	0
Additional paid-in capital	4,479	4,479
Retained earnings	3,098	3,033
Accumulated other comprehensive loss, net	(11)	(11)
Total shareholder's equity	7,568	7,503
Total liabilities and equity	$ 22,418	$ 22,367

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - PacifiCorp - $ / shares shares in Millions	Mar. 31, 2016	Dec. 31, 2015
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

Consolidated Balance Sheets - M

Consolidated Balance Sheets - MEC - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 1,086	$ 1,108
Income taxes receivable	329	319
Inventories	902	882
Other current assets	796	814
Total current assets	4,972	5,243
Regulatory assets	4,182	4,155
Investments and restricted cash and investments	3,719	3,367
Other assets	1,076	1,008
Total assets	84,246	83,618
Current liabilities:
Accounts Payable, Current	1,246	1,564
Accrued interest	486	469
Accrued property, income and other taxes	377	372
Short-term debt	1,722	974
Other current liabilities	961	896
Total current liabilities	6,428	6,089
Deferred income taxes	12,797	12,685
Regulatory liabilities	2,676	2,631
Other long-term liabilities	2,843	2,854
Total liabilities	$ 61,122	$ 61,083
Commitments and contingencies
Equity:
Common stock	$ 0	$ 0
Additional paid-in capital	6,403	6,403
Retained earnings	17,396	16,906
Accumulated other comprehensive loss, net	(809)	(908)
Total shareholder's equity	22,990	22,401
Total liabilities and equity	84,246	83,618
MidAmerican Energy Company [Member]
Current assets:
Cash and cash equivalents	1	103
Receivables, Net, Current	198	342
Income taxes receivable	126	104
Inventories	239	238
Other current assets	28	58
Total current assets	592	845
Public Utilities, Property, Plant and Equipment, Net	11,759	11,723
Regulatory assets	1,078	1,044
Investments and restricted cash and investments	647	634
Other assets	138	139
Total assets	14,214	14,385
Current liabilities:
Accounts Payable, Current	197	426
Accrued interest	47	46
Accrued property, income and other taxes	100	125
Short-term debt	70	0
Long-term Debt and Capital Lease Obligations, Current	34	34
Other current liabilities	127	166
Total current liabilities	575	797
Long-term Debt and Capital Lease Obligations	4,234	4,237
Deferred income taxes	3,133	3,061
Regulatory liabilities	848	831
Asset Retirement Obligations, Noncurrent	484	488
Other long-term liabilities	248	266
Total liabilities	$ 9,522	$ 9,680
Commitments and contingencies
Equity:
Common stock	$ 0	$ 0
Additional paid-in capital	561	561
Retained earnings	4,133	4,174
Accumulated other comprehensive loss, net	(2)	(30)
Total shareholder's equity	4,692	4,705
Total liabilities and equity	$ 14,214	$ 14,385

Consolidated Balance Sheets - 6

Consolidated Balance Sheets - MidAmerican Funding - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents		$ 1,086	$ 1,108
Income taxes receivable		329	319
Inventories		902	882
Other current assets		796	814
Total current assets		4,972	5,243
Property, plant and equipment, net		61,152	60,769
Goodwill		9,145	9,076
Regulatory assets		4,182	4,155
Investments and restricted cash and investments		3,719	3,367
Other assets		1,076	1,008
Total assets		84,246	83,618
Current liabilities:
Accounts payable		1,246	1,564
Accrued interest		486	469
Accrued property, income and other taxes		377	372
Short-term debt		1,722	974
Other current liabilities		961	896
Total current liabilities		6,428	6,089
Deferred income taxes		12,797	12,685
Regulatory liabilities		2,676	2,631
Other long-term liabilities		2,843	2,854
Total liabilities		$ 61,122	$ 61,083
Commitments and contingencies
Equity:
Additional paid-in capital		$ 6,403	$ 6,403
Retained earnings		17,396	16,906
Accumulated other comprehensive loss, net		(809)	(908)
Total member's equity		22,990	22,401
Total liabilities and equity		84,246	83,618
MidAmerican Funding, LLC and Subsidiaries [Domain]
Current assets:
Cash and cash equivalents		2	103
Receivables, Net, Current		198	346
Income taxes receivable		127	104
Inventories		239	238
Other current assets		27	58
Total current assets		593	849
Property, plant and equipment, net		11,773	11,737
Goodwill		1,270	1,270
Regulatory assets		1,078	1,044
Investments and restricted cash and investments		649	636
Other assets		138	138
Total assets	[1]	15,501	15,674
Current liabilities:
Accounts payable		197	427
Accrued interest		49	53
Accrued property, income and other taxes		99	125
Notes Payable, Related Parties, Current		31	139
Short-term debt		70	0
Long-term Debt and Capital Lease Obligations, Current		34	34
Other current liabilities		127	166
Total current liabilities		607	944
Long-term Debt and Capital Lease Obligations		4,560	4,563
Deferred income taxes		3,129	3,056
Regulatory liabilities		848	831
Asset Retirement Obligations, Noncurrent		484	488
Other long-term liabilities		248	267
Total liabilities		$ 9,876	$ 10,149
Commitments and contingencies
Equity:
Additional paid-in capital		$ 1,679	$ 1,679
Retained earnings		3,948	3,876
Accumulated other comprehensive loss, net		(2)	(30)
Total member's equity		5,625	5,525
Total liabilities and equity		$ 15,501	$ 15,674
[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	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 1,086	$ 1,108
Trade receivables, net	1,613	1,785
Inventories	902	882
Other current assets	796	814
Total current assets	4,972	5,243
Regulatory assets	4,182	4,155
Other assets	1,076	1,008
Total assets	84,246	83,618
Current liabilities:
Accounts payable	1,246	1,564
Accrued interest	486	469
Accrued property, income and other taxes	377	372
Regulatory Liability, Current	434	402
Other current liabilities	961	896
Total current liabilities	6,428	6,089
Regulatory liabilities	2,676	2,631
Deferred income taxes	12,797	12,685
Other long-term liabilities	2,843	2,854
Total liabilities	$ 61,122	$ 61,083
Commitments and contingencies
Equity:
Common stock	$ 0	$ 0
Additional paid-in capital	6,403	6,403
Retained earnings	17,396	16,906
Accumulated other comprehensive loss, net	(809)	(908)
Total shareholder's equity	22,990	22,401
Total liabilities and equity	84,246	83,618
Nevada Power Company [Member]
Current assets:
Cash and cash equivalents	347	536
Trade receivables, net	205	265
Inventories	80	80
Other current assets	51	46
Total current assets	683	927
Public Utilities, Property, Plant and Equipment, Net	6,996	6,996
Regulatory assets	1,051	1,057
Other assets	39	37
Total assets	8,769	9,017
Current liabilities:
Accounts payable	179	214
Accrued interest	38	54
Accrued property, income and other taxes	29	30
Regulatory Liability, Current	181	173
Long-term Debt and Financial and Capital Lease Obligations, Current	13	225
Customer Deposits, Current	58	58
Other current liabilities	38	28
Total current liabilities	536	782
Long-term Debt and Financial and Capital Lease Obligations	3,058	3,060
Regulatory liabilities	306	304
Deferred income taxes	1,407	1,405
Other long-term liabilities	296	303
Total liabilities	$ 5,603	$ 5,854
Commitments and contingencies
Equity:
Common stock	$ 0	$ 0
Additional paid-in capital	2,308	2,308
Retained earnings	861	858
Accumulated other comprehensive loss, net	(3)	(3)
Total shareholder's equity	3,166	3,163
Total liabilities and equity	$ 8,769	$ 9,017

Consolidated Balance Sheets (P8

Consolidated Balance Sheets (Parenthetical) - NPC - $ / shares	Mar. 31, 2016	Dec. 31, 2015
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	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 1,086	$ 1,108
Trade receivables, net	1,613	1,785
Inventories	902	882
Other current assets	796	814
Total current assets	4,972	5,243
Regulatory assets	4,182	4,155
Other assets	1,076	1,008
Total assets	84,246	83,618
Current liabilities:
Accounts payable	1,246	1,564
Accrued interest	486	469
Accrued property, income and other taxes	377	372
Regulatory Liability, Current	434	402
Other current liabilities	961	896
Total current liabilities	6,428	6,089
Regulatory liabilities	2,676	2,631
Deferred income taxes	12,797	12,685
Other long-term liabilities	2,843	2,854
Total liabilities	$ 61,122	$ 61,083
Commitments and contingencies
Equity:
Common stock	$ 0	$ 0
Additional paid-in capital	6,403	6,403
Retained earnings	17,396	16,906
Total shareholder's equity	22,990	22,401
Total liabilities and equity	84,246	83,618
Sierra Pacific Power Company [Member]
Current assets:
Cash and cash equivalents	135	106
Trade receivables, net	99	124
Inventories	39	39
Other current assets	20	13
Total current assets	293	282
Public Utilities, Property, Plant and Equipment, Net	2,770	2,766
Regulatory assets	430	432
Other assets	7	7
Total assets	3,500	3,487
Current liabilities:
Accounts payable	97	127
Accrued interest	16	15
Accrued property, income and other taxes	13	13
Regulatory Liability, Current	90	78
Long-term Debt and Financial and Capital Lease Obligations, Current	453	453
Customer Deposits, Current	17	17
Other current liabilities	14	11
Total current liabilities	700	714
Long-term Debt and Financial and Capital Lease Obligations	749	749
Regulatory liabilities	229	230
Deferred income taxes	580	570
Other long-term liabilities	149	148
Total liabilities	$ 2,407	$ 2,411
Commitments and contingencies
Equity:
Common stock	$ 0	$ 0
Additional paid-in capital	1,111	1,111
Retained earnings	(18)	(35)
Total shareholder's equity	1,093	1,076
Total liabilities and equity	$ 3,500	$ 3,487

Consolidated Balance Sheets (10

Consolidated Balance Sheets (Parenthetical) - SPPC - $ / shares	Mar. 31, 2016	Dec. 31, 2015
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 (11

Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Millions	Mar. 31, 2016	Dec. 31, 2015
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
	Mar. 31, 2016	Mar. 31, 2015
Operating revenue:
Energy	$ 3,550	$ 3,773
Real estate	491	448
Total operating revenue	4,041	4,221
Energy:
Cost of sales	1,095	1,354
Operating expense	882	906
Depreciation and amortization	619	581
Real estate	492	450
Total operating costs and expenses	3,088	3,291
Operating income	953	930
Other income (expense):
Interest expense	(473)	(472)
Capitalized interest	11	29
Allowance for equity funds	15	31
Interest and dividend income	27	26
Other, net	10	26
Total other income (expense)	(410)	(360)
Income before income tax expense and equity income	543	570
Income tax expense	74	123
Equity income	26	26
Net income	495	473
Net income attributable to noncontrolling interests	5	4
Net income attributable to BHE shareholders	$ 490	$ 469

Consolidated Statements of Op13

Consolidated Statements of Operations - PacifiCorp - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating costs and expenses:
Operating income	$ 953	$ 930
Other income (expense):
Interest expense	(473)	(472)
Allowance for equity funds	15	31
Other, net	10	26
Total other income (expense)	(410)	(360)
Income before income tax expense and equity income	543	570
Income tax expense	74	123
Net income attributable to BHE shareholders	490	469
PacifiCorp [Member]
Electric Domestic Regulated Revenue	1,252	1,250
Operating costs and expenses:
Cost of Domestic Regulated Electric	427	476
Utilities Operating Expense, Maintenance and Operations	263	268
Utilities Operating Expense, Depreciation and Amortization	190	189
Utilities Operating Expense, Taxes	48	45
Utilities Operating Expense	928	978
Operating income	324	272
Other income (expense):
Interest expense	(95)	(94)
Allowance for Funds Used During Construction, Capitalized Interest	4	6
Allowance for equity funds	7	10
Other, net	3	3
Total other income (expense)	(81)	(75)
Income before income tax expense and equity income	243	197
Income tax expense	78	63
Net income attributable to BHE shareholders	$ 165	$ 134

Consolidated Statements of Op14

Consolidated Statements of Operations - MEC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating revenue:
Total operating revenue	$ 4,041	$ 4,221
Operating costs and expenses:
Total operating costs and expenses	3,088	3,291
Operating income	953	930
Other income (expense):
Interest expense	(473)	(472)
Allowance for equity funds	15	31
Other, net	10	26
Total other income (expense)	(410)	(360)
Income before income tax expense and equity income	543	570
Income tax expense	74	123
Net income attributable to BHE shareholders	490	469
MidAmerican Energy Company [Member]
Operating revenue:
Electric Domestic Regulated Revenue	399	426
Gas Domestic Regulated Revenue And Other Revenue	226	296
Total operating revenue	625	722
Operating costs and expenses:
Cost of Domestic Regulated Electric	92	122
Cost of gas sold and other	135	201
Utilities Operating Expense, Maintenance and Operations	160	170
Utilities Operating Expense, Depreciation and Amortization	110	100
Utilities Operating Expense, Taxes	28	29
Total operating costs and expenses	525	622
Operating income	100	100
Other income (expense):
Interest expense	(49)	(44)
Allowance for Funds Used During Construction, Capitalized Interest	1	2
Allowance for equity funds	4	5
Other, net	3	3
Total other income (expense)	(41)	(34)
Income before income tax expense and equity income	59	66
Income tax expense	(17)	(24)
Income (Loss) from Continuing Operations Attributable to Parent	76	90
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	0	7
Discontinued Operation, Tax Effect of Discontinued Operation	0	3
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0	4
Net income attributable to BHE shareholders	$ 76	$ 94

Consolidated Statements of Op15

Consolidated Statements of Operations - MidAmerican Funding - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating revenue:
Total operating revenue	$ 4,041	$ 4,221
Operating costs and expenses:
Total operating costs and expenses	3,088	3,291
Operating income	953	930
Other income (expense):
Other Interest and Dividend Income	473	472
Allowance for equity funds	15	31
Other, net	10	26
Total other income (expense)	(410)	(360)
Income before income tax expense and equity income	543	570
Income tax expense	74	123
Net income attributable to BHE shareholders	490	469
MidAmerican Funding, LLC and Subsidiaries [Domain]
Operating revenue:
Electric Domestic Regulated Revenue	399	426
Gas Domestic Regulated Revenue And Other Revenue	227	301
Total operating revenue	626	727
Operating costs and expenses:
Cost of Domestic Regulated Electric	92	122
Cost of Natural Gas Purchases And Cost of Other Goods And Services Sold	135	205
Utilities Operating Expense, Maintenance and Operations	161	170
Utilities Operating Expense, Depreciation and Amortization	110	100
Utilities Operating Expense, Taxes	28	29
Total operating costs and expenses	526	626
Operating income	100	101
Other income (expense):
Other Interest and Dividend Income	54	50
Allowance for Funds Used During Construction, Capitalized Interest	1	2
Allowance for equity funds	4	5
Other, net	3	16
Total other income (expense)	(46)	(27)
Income before income tax expense and equity income	54	74
Income tax expense	(19)	(21)
Income (Loss) from Continuing Operations Attributable to Parent	73	95
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	0	7
Discontinued Operation, Tax Effect of Discontinued Operation	0	3
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0	4
Net income attributable to BHE shareholders	$ 73	$ 99

Consolidated Statements of Op16

Consolidated Statements of Operations - NPC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cost of sales	$ 1,095	$ 1,354
Total operating costs and expenses	3,088	3,291
Operating income	953	930
Interest expense	473	472
Allowance for equity funds	15	31
Other, net	10	26
Total other income (expense)	(410)	(360)
Income before income tax expense and equity income	543	570
Income tax expense	74	123
Net income attributable to BHE shareholders	490	469
Nevada Power Company [Member]
Electric Domestic Regulated Revenue	399	459
Cost of sales	168	226
Utilities Operating Expense, Maintenance and Operations	99	76
Utilities Operating Expense, Depreciation and Amortization	75	74
Utilities Operating Expense, Taxes	11	9
Total operating costs and expenses	353	385
Operating income	46	74
Interest expense	48	46
Allowance for Funds Used During Construction, Capitalized Interest	(1)	(1)
Allowance for equity funds	1	1
Other, net	5	7
Total other income (expense)	(41)	(37)
Income before income tax expense and equity income	5	37
Income tax expense	2	13
Net income attributable to BHE shareholders	$ 3	$ 24

Consolidated Statements of Op17

Consolidated Statements of Operations - SPPC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Total operating revenue	$ 4,041	$ 4,221
Cost of sales	1,095	1,354
Total operating costs and expenses	3,088	3,291
Operating income	953	930
Interest expense	473	472
Allowance for equity funds	15	31
Other, net	10	26
Total other income (expense)	(410)	(360)
Income before income tax expense and equity income	543	570
Income tax expense	74	123
Net income attributable to BHE shareholders	490	469
Sierra Pacific Power Company [Member]
Electric Domestic Regulated Revenue	170	196
Gas Domestic Regulated Revenue	47	50
Total operating revenue	217	246
Cost of sales	70	97
Cost of Purchased Oil and Gas	30	35
Utilities Operating Expense, Maintenance and Operations	41	36
Utilities Operating Expense, Depreciation and Amortization	29	28
Utilities Operating Expense, Taxes	6	7
Total operating costs and expenses	176	203
Operating income	41	43
Interest expense	16	15
Allowance for equity funds	1	1
Other, net	1	1
Total other income (expense)	(14)	(13)
Income before income tax expense and equity income	27	30
Income tax expense	10	11
Net income attributable to BHE shareholders	$ 17	$ 19

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 495	$ 473
Other comprehensive income (loss), net of tax:
Unrecognized amounts on retirement benefits, net of tax of $6 and $8	22	22
Foreign currency translation adjustment	67	(424)
Unrealized gains on available-for-sale securities, net of tax of $22 and $113	33	166
Unrealized (losses) gains on cash flow hedges, net of tax of $(14) and $1	(23)	1
Total other comprehensive income (loss), net of tax	99	(235)
Comprehensive income	594	238
Comprehensive income attributable to noncontrolling interests	5	4
Comprehensive income attributable to BHE shareholders	$ 589	$ 234

Consolidated Statements of Co19

Consolidated Statements of Comprehensive Income - MEC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net Income (Loss) Attributable to Parent	$ 490	$ 469
Unrealized gains on available-for-sale securities, net of tax of $22 and $113	33	166
Unrealized (losses) gains on cash flow hedges, net of tax of $(14) and $1	(23)	1
Total other comprehensive income (loss), net of tax	99	(235)
Comprehensive income attributable to BHE shareholders	589	234
MidAmerican Energy Company [Member]
Net Income (Loss) Attributable to Parent	76	94
Unrealized gains on available-for-sale securities, net of tax of $22 and $113	1	0
Unrealized (losses) gains on cash flow hedges, net of tax of $(14) and $1	0	2
Total other comprehensive income (loss), net of tax	1	2
Comprehensive income attributable to BHE shareholders	$ 77	$ 96

Consolidated Statements of Co20

Consolidated Statements of Comprehensive Income (Parenthetical) - MEC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Unrealized (losses) gains on available-for-sale securities, tax	$ 22	$ 113
Unrealized (losses) gains on cash flow hedges, tax	(14)	1
MidAmerican Energy Company [Member]
Unrealized (losses) gains on available-for-sale securities, tax	0	0
Unrealized (losses) gains on cash flow hedges, tax	$ 0	$ 2

Consolidated Statements of Co21

Consolidated Statements of Comprehensive Income - MidAmerican Funding - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net Income (Loss) Attributable to Parent	$ 490	$ 469
Unrealized gains on available-for-sale securities, net of tax of $22 and $113	33	166
Unrealized (losses) gains on cash flow hedges, net of tax of $(14) and $1	(23)	1
Total other comprehensive income (loss), net of tax	99	(235)
Comprehensive income attributable to BHE shareholders	589	234
MidAmerican Funding, LLC and Subsidiaries [Domain]
Net Income (Loss) Attributable to Parent	73	99
Unrealized gains on available-for-sale securities, net of tax of $22 and $113	1	0
Unrealized (losses) gains on cash flow hedges, net of tax of $(14) and $1	0	2
Total other comprehensive income (loss), net of tax	1	2
Comprehensive income attributable to BHE shareholders	$ 74	$ 101

Consolidated Statements of Co22

Consolidated Statements of Comprehensive Income (Parenthetical) - MidAmerican Funding - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Unrealized (losses) gains on available-for-sale securities, tax	$ 22	$ 113
Unrealized (losses) gains on cash flow hedges, tax	(14)	1
MidAmerican Funding, LLC and Subsidiaries [Domain]
Unrealized (losses) gains on available-for-sale securities, tax	0	0
Unrealized (losses) gains on cash flow hedges, tax	$ 0	$ 2

Consolidated Statements of Co23

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Consolidated Statements of Comprehensive Income Parenthetical [Abstract]
Unrecognized amounts on retirement benefits, tax	$ 6	$ 8
Unrealized (losses) gains on available-for-sale securities, tax	22	113
Unrealized (losses) gains on cash flow hedges, tax	$ (14)	$ 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, 2014		77
Balance at Dec. 31, 2014	$ 20,573	$ 0	$ 6,423	$ 14,513	$ (494)	$ 131
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASC 853	67	0	0	56	0	11
Net Income	472	0	0	469	0	3
Other comprehensive income (loss)	(235)	0	0	0	(235)	0
Distributions	(6)	0	0	0	0	(6)
Common stock purchases	(36)	$ 0	(3)	(33)	0	0
Balance (shares) at Mar. 31, 2015		77
Balance at Mar. 31, 2015	$ 20,835	$ 0	6,420	15,005	(729)	139
Balance (shares) at Dec. 31, 2015	77	77
Balance at Dec. 31, 2015	$ 22,535	$ 0	6,403	16,906	(908)	134
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	494	0	0	490	0	4
Other comprehensive income (loss)	99	0	0	0	99	0
Distributions	$ (4)	$ 0	0	0	0	(4)
Balance (shares) at Mar. 31, 2016	77	77
Balance at Mar. 31, 2016	$ 23,124	$ 0	$ 6,403	$ 17,396	$ (809)	$ 134

Consolidated Statements of Ch25

Consolidated Statements of Changes in Equity - PacifiCorp - USD ($) $ in Millions	Total	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, 2014		$ 7,756	$ 2	$ 0	$ 4,479	$ 3,288	$ (13)
Net Income (Loss) Attributable to Parent	$ 469	134				134
Dividends, Common Stock, Cash		(450)				(450)
Stockholders' Equity Attributable to Parent at Mar. 31, 2015		7,440	2	0	4,479	2,972	(13)
Stockholders' Equity Attributable to Parent at Dec. 31, 2015	22,401	7,503	2	0	4,479	3,033	(11)
Net Income (Loss) Attributable to Parent	490	165				165
Dividends, Common Stock, Cash		(100)				(100)
Stockholders' Equity Attributable to Parent at Mar. 31, 2016	$ 22,990	$ 7,568	$ 2	$ 0	$ 4,479	$ 3,098	$ (11)

Consolidated Statements of Ch26

Consolidated 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, 2014					$ 4,250	$ 561	$ 3,712	$ (23)
Net Income (Loss) Attributable to Parent	$ 469				94		94
Other comprehensive income (loss)	(235)	$ 0	$ 0	$ (235)	2			2
Stockholders' Equity Attributable to Parent at Mar. 31, 2015					4,346	561	3,806	(21)
Stockholders' Equity Attributable to Parent at Dec. 31, 2015	22,401				4,705	561	4,174	(30)
Net Income (Loss) Attributable to Parent	490				76		76
Other comprehensive income (loss)	99	$ 0	$ 0	$ 99	1			1
Dividend, Noncash, Spin-off Of Operations					90		117	27
Stockholders' Equity Attributable to Parent at Mar. 31, 2016	$ 22,990				$ 4,692	$ 561	$ 4,133	$ (2)

Consolidated Statements of Ch27

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, 2014					$ 5,073	$ 1,679	$ 3,417	$ (23)
Net Income (Loss) Attributable to Parent	$ 469				99		99
Other comprehensive income (loss)	(235)	$ 0	$ 0	$ (235)	2			2
Stockholders' Equity Attributable to Parent at Mar. 31, 2015					5,175	1,679	3,517	(21)
Stockholders' Equity, Other					1		1
Stockholders' Equity Attributable to Parent at Dec. 31, 2015	22,401				5,525	1,679	3,876	(30)
Net Income (Loss) Attributable to Parent	490				73		73
Other comprehensive income (loss)	99	$ 0	$ 0	$ 99	1			1
Stockholders' Equity Note, Spinoff Transaction					27			27
Stockholders' Equity Attributable to Parent at Mar. 31, 2016	$ 22,990				5,625	$ 1,679	3,948	$ (2)
Stockholders' Equity, Other					$ (1)		$ (1)

Consolidated Statements of Ch28

Consolidated Statements of Changes in Equity - NPC - USD ($) $ in Millions	Total	Common Stock [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, 2014		77,000,000		1,000
Stockholders' Equity Attributable to Parent at Dec. 31, 2014			$ 2,888	$ 0	$ 2,308	$ 583	$ (3)
Net Income (Loss) Attributable to Parent	$ 469		24			24
Balance (shares) at Mar. 31, 2015		77,000,000		1,000
Stockholders' Equity Attributable to Parent at Mar. 31, 2015			$ 2,912	$ 0	2,308	607	(3)
Balance (shares) at Dec. 31, 2015	77,000,000	77,000,000	1,000	1,000
Stockholders' Equity Attributable to Parent at Dec. 31, 2015	$ 22,401		$ 3,163	$ 0	2,308	858	(3)
Net Income (Loss) Attributable to Parent	$ 490		$ 3			3
Balance (shares) at Mar. 31, 2016	77,000,000	77,000,000	1,000	1,000
Stockholders' Equity Attributable to Parent at Mar. 31, 2016	$ 22,990		$ 3,166	$ 0	$ 2,308	$ 861	$ (3)

Consolidated Statements of Ch29

Consolidated Statements of Changes in Equity - SPPC - USD ($) $ in Millions	Total	Common Stock [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, 2014		77,000,000		1,000
Stockholders' Equity Attributable to Parent at Dec. 31, 2014			$ 998	$ 0	$ 1,111	$ (111)	$ (2)
Net Income (Loss) Attributable to Parent	$ 469		19			19
Balance (shares) at Mar. 31, 2015		77,000,000		1,000
Stockholders' Equity Attributable to Parent at Mar. 31, 2015			$ 1,017	$ 0	1,111	(92)	(2)
Balance (shares) at Dec. 31, 2015	77,000,000	77,000,000	1,000	1,000
Stockholders' Equity Attributable to Parent at Dec. 31, 2015	$ 22,401		$ 1,076	$ 0	1,111	(35)	0
Net Income (Loss) Attributable to Parent	$ 490		$ 17			17
Balance (shares) at Mar. 31, 2016	77,000,000	77,000,000	1,000	1,000
Stockholders' Equity Attributable to Parent at Mar. 31, 2016	$ 22,990		$ 1,093	$ 0	$ 1,111	$ (18)	$ 0

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net income	$ 495	$ 473
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	626	587
Allowance for equity funds	(15)	(31)
Equity income, net of distributions	(16)	(25)
Increase (Decrease) in Regulatory Assets and Liabilities	60	152
Deferred income taxes and amortization of investment tax credits	72	206
Other, net	3	(10)
Changes in other operating assets and liabilities, net of effects from acquisitions:
Increase (Decrease) in Accounts Receivable and Other Operating Assets	219	(18)
Derivative collateral, net	(3)	(21)
Pension and other postretirement benefit plans	(6)	(4)
Accrued property, income and other taxes	(2)	(99)
Accounts payable and other liabilities	(73)	(103)
Net cash flows from operating activities	1,360	1,107
Cash flows from investing activities:
Capital expenditures	(1,027)	(1,426)
Acquisitions, net of cash acquired	(13)	(59)
Decrease in restricted cash and investments	41	12
Purchases of available-for-sale securities	(34)	(68)
Proceeds from sales of available-for-sale securities	61	57
Equity method investments	(273)	(12)
Other, net	(39)	41
Net cash flows from investing activities	(1,284)	(1,455)
Cash flows from financing activities:
Repayments of Subordinated Debt	500	0
Common stock purchases	0	(36)
Proceeds from subsidiary debt	0	484
Repayments of subsidiary debt	(310)	(353)
Net proceeds from short-term debt	722	163
Other, net	(11)	(19)
Net cash flows from financing activities	(99)	239
Effect of exchange rate changes	1	(1)
Net change in cash and cash equivalents	(22)	(110)
Cash and cash equivalents at beginning of period	1,108	617
Cash and cash equivalents at end of period	$ 1,086	$ 507

Consolidated Statements of Ca31

Consolidated Statements of Cash Flows - PacifiCorp - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net Income (Loss) Attributable to Parent	$ 490	$ 469
Increase (Decrease) in Allowance for Equity Funds Used During Construction	(15)	(31)
Deferred income taxes and amortization of investment tax credits	72	206
Increase (Decrease) in Regulatory Assets and Liabilities	60	152
Other Noncash Income (Expense)	3	(10)
Increase (Decrease) in Accounts Receivable and Other Operating Assets	219	(18)
Derivative collateral, net	(3)	(21)
Accounts payable and other liabilities	(73)	(103)
Net cash flows from operating activities	1,360	1,107
Capital expenditures	(1,027)	(1,426)
Other, net	(39)	41
Net cash flows from investing activities	(1,284)	(1,455)
Net proceeds from short-term debt	722	163
Other, net	(11)	(19)
Net cash flows from financing activities	(99)	239
Net change in cash and cash equivalents	(22)	(110)
Cash and cash equivalents at beginning of period	1,108	617
Cash and cash equivalents at end of period	1,086	507
PacifiCorp [Member]
Net Income (Loss) Attributable to Parent	165	134
Utilities Operating Expense, Depreciation and Amortization	190	189
Increase (Decrease) in Allowance for Equity Funds Used During Construction	(7)	(10)
Deferred income taxes and amortization of investment tax credits	(6)	(10)
Increase (Decrease) in Regulatory Assets and Liabilities	29	21
Other Noncash Income (Expense)	0	1
Increase (Decrease) in Accounts Receivable and Other Operating Assets	104	89
Derivative collateral, net	(3)	(36)
Increase (Decrease) in Inventories	(24)	5
Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable	84	73
Accounts payable and other liabilities	0	26
Net cash flows from operating activities	532	482
Capital expenditures	(200)	(208)
Other, net	(2)	(25)
Net cash flows from investing activities	(202)	(233)
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities	(55)	0
Net proceeds from short-term debt	(20)	190
Payments of Ordinary Dividends, Common Stock	(100)	(450)
Net cash flows from financing activities	(175)	(260)
Net change in cash and cash equivalents	155	(11)
Cash and cash equivalents at beginning of period	12	23
Cash and cash equivalents at end of period	$ 167	$ 12

Consolidated Statements of Ca32

Consolidated Statements of Cash Flows - MEC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net Income (Loss) Attributable to Parent	$ 490	$ 469
Deferred income taxes and amortization of investment tax credits	72	206
Other Noncash Income (Expense)	(3)	10
Increase (Decrease) in Counterparty Collateral, Net	3	21
Pension and other postretirement benefit plans	(6)	(4)
Accrued property, income and other taxes	(2)	(99)
Net cash flows from operating activities	1,360	1,107
Payments to Acquire Property, Plant, and Equipment	1,027	1,426
Payments to Acquire Available-for-sale Securities	34	68
Proceeds from sales of available-for-sale securities	61	57
Payments for (Proceeds from) Other Investing Activities	39	(41)
Net cash flows from investing activities	(1,284)	(1,455)
Net proceeds from short-term debt	722	163
Other, net	(11)	(19)
Net cash flows from financing activities	(99)	239
Net change in cash and cash equivalents	(22)	(110)
Cash and cash equivalents at beginning of period	1,108	617
Cash and cash equivalents at end of period	1,086	507
MidAmerican Energy Company [Member]
Net Income (Loss) Attributable to Parent	76	94
Utilities Operating Expense, Depreciation and Amortization	110	100
Deferred income taxes and amortization of investment tax credits	11	0
Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net	(11)	(11)
Other Noncash Income (Expense)	13	(7)
Increase (Decrease) in Accounts and Other Receivables	(28)	(43)
Increase (Decrease) in Inventories	1	(34)
Increase (Decrease) in Counterparty Collateral, Net	(2)	(15)
Pension and other postretirement benefit plans	(2)	(2)
Increase (Decrease) in Accounts Payable	4	(45)
Accrued property, income and other taxes	(48)	(40)
Increase (Decrease) in Other Current Assets and Liabilities, Net	6	11
Net cash flows from operating activities	172	206
Payments to Acquire Property, Plant, and Equipment	332	244
Payments to Acquire Available-for-sale Securities	34	27
Proceeds from sales of available-for-sale securities	29	19
Payments for (Proceeds from) Other Investing Activities	3	(2)
Net cash flows from investing activities	(340)	(250)
Repayments of Long-term Debt	4	0
Net proceeds from short-term debt	70	15
Net cash flows from financing activities	66	15
Net change in cash and cash equivalents	(102)	(29)
Cash and cash equivalents at beginning of period	103	29
Cash and cash equivalents at end of period	$ 1	$ 0

Consolidated Statements of Ca33

Consolidated Statements of Cash Flows - MidAmerican Funding - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net Income (Loss) Attributable to Parent	$ 490	$ 469
Deferred income taxes and amortization of investment tax credits	72	206
Other Noncash Income (Expense)	(3)	10
Increase (Decrease) in Counterparty Collateral, Net	3	21
Pension and other postretirement benefit plans	(6)	(4)
Accrued property, income and other taxes	(2)	(99)
Net cash flows from operating activities	1,360	1,107
Payments to Acquire Property, Plant, and Equipment	1,027	1,426
Payments to Acquire Available-for-sale Securities	34	68
Proceeds from sales of available-for-sale securities	61	57
Payments for (Proceeds from) Other Investing Activities	39	(41)
Net cash flows from investing activities	(1,284)	(1,455)
Net proceeds from short-term debt	722	163
Other, net	(11)	(19)
Net cash flows from financing activities	(99)	239
Net change in cash and cash equivalents	(22)	(110)
Cash and cash equivalents at beginning of period	1,108	617
Cash and cash equivalents at end of period	1,086	507
MidAmerican Funding, LLC and Subsidiaries [Domain]
Net Income (Loss) Attributable to Parent	73	99
Utilities Operating Expense, Depreciation and Amortization	110	100
Deferred income taxes and amortization of investment tax credits	11	0
Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net	(11)	(11)
Other Noncash Income (Expense)	13	6
Increase (Decrease) in Accounts and Other Receivables	(31)	(44)
Increase (Decrease) in Inventories	1	(34)
Increase (Decrease) in Counterparty Collateral, Net	(2)	(15)
Pension and other postretirement benefit plans	(2)	(2)
Increase (Decrease) in Accounts Payable	4	(45)
Accrued property, income and other taxes	(51)	(37)
Increase (Decrease) in Other Current Assets and Liabilities, Net	12	16
Net cash flows from operating activities	163	197
Payments to Acquire Property, Plant, and Equipment	332	244
Payments to Acquire Available-for-sale Securities	34	27
Proceeds from sales of available-for-sale securities	29	19
Proceeds from Sale of Other Assets, Investing Activities	0	13
Payments for (Proceeds from) Other Investing Activities	2	(2)
Net cash flows from investing activities	(339)	(237)
Repayments of Long-term Debt	4	0
Increase (Decrease) in Notes Payable, Related Parties, Current	9	(4)
Net proceeds from short-term debt	70	15
Net cash flows from financing activities	75	11
Net change in cash and cash equivalents	(101)	(29)
Cash and cash equivalents at beginning of period	103	30
Cash and cash equivalents at end of period	$ 2	$ 1

Consolidated Statements of Ca34

Consolidated Statements of Cash Flows - NPC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net Income (Loss) Attributable to Parent	$ 490	$ 469
Deferred income taxes and amortization of investment tax credits	72	206
Allowance for equity funds	(15)	(31)
Increase (Decrease) in Regulatory Assets and Liabilities	60	152
Other Noncash Income (Expense)	(3)	10
Increase (Decrease) in Accounts Receivable and Other Operating Assets	(219)	18
Accounts payable and other liabilities	(73)	(103)
Net cash flows from operating activities	1,360	1,107
Payments to Acquire Property, Plant, and Equipment	1,027	1,426
Payments for (Proceeds from) Other Investing Activities	39	(41)
Net cash flows from investing activities	(1,284)	(1,455)
Net cash flows from financing activities	(99)	239
Net change in cash and cash equivalents	(22)	(110)
Cash and cash equivalents at end of period	1,086	507
Cash and cash equivalents at beginning of period	1,108	617
Nevada Power Company [Member]
Net Income (Loss) Attributable to Parent	3	24
Other Nonrecurring (Income) Expense	0	(3)
Utilities Operating Expense, Depreciation and Amortization	75	74
Deferred income taxes and amortization of investment tax credits	2	13
Allowance for equity funds	(1)	(1)
Increase (Decrease) in Regulatory Assets and Liabilities	7	1
Deferred Energy Change	23	39
Amortization of Deferred Charges	(14)	16
Other Noncash Income (Expense)	0	16
Increase (Decrease) in Accounts Receivable and Other Operating Assets	(47)	18
Increase (Decrease) in Inventories	0	2
Accounts payable and other liabilities	(19)	(35)
Net cash flows from operating activities	123	92
Payments to Acquire Property, Plant, and Equipment	98	63
Proceeds from Sale of Other Property, Plant, and Equipment	0	4
Payments for (Proceeds from) Other Investing Activities	0	(10)
Net cash flows from investing activities	(98)	(49)
Repayments of Long-term Debt	214	252
Repayments of Short-term Debt	0	(30)
Net cash flows from financing activities	(214)	(222)
Net change in cash and cash equivalents	(189)	(179)
Cash and cash equivalents at end of period	347	41
Cash and cash equivalents at beginning of period	$ 536	$ 220

Consolidated Statements of Ca35

Consolidated Statements of Cash Flows - SPPC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net Income (Loss) Attributable to Parent	$ 490	$ 469
Increase (Decrease) in Allowance for Equity Funds Used During Construction	15	31
Deferred income taxes and amortization of investment tax credits	72	206
Increase (Decrease) in Regulatory Assets and Liabilities	60	152
Other Noncash Income (Expense)	(3)	10
Increase (Decrease) in Accounts Receivable and Other Operating Assets	219	(18)
Accounts payable and other liabilities	(73)	(103)
Net cash flows from operating activities	1,360	1,107
Payments to Acquire Property, Plant, and Equipment	1,027	1,426
Payments for (Proceeds from) Other Investing Activities	39	(41)
Net cash flows from investing activities	(1,284)	(1,455)
Net cash flows from financing activities	(99)	239
Net change in cash and cash equivalents	(22)	(110)
Cash and cash equivalents at beginning of period	1,108	617
Cash and cash equivalents at end of period	1,086	507
Sierra Pacific Power Company [Member]
Net Income (Loss) Attributable to Parent	17	19
Utilities Operating Expense, Depreciation and Amortization	29	28
Increase (Decrease) in Allowance for Equity Funds Used During Construction	(1)	0
Deferred income taxes and amortization of investment tax credits	10	11
Increase (Decrease) in Regulatory Assets and Liabilities	(3)	(4)
Deferred Energy Change	23	26
Amortization of Deferred Charges	(9)	12
Other Noncash Income (Expense)	0	1
Increase (Decrease) in Accounts Receivable and Other Operating Assets	18	(11)
Increase (Decrease) in Inventories	1	0
Accounts payable and other liabilities	(7)	(4)
Net cash flows from operating activities	78	76
Payments to Acquire Property, Plant, and Equipment	48	47
Payments for (Proceeds from) Other Investing Activities	0	(2)
Net cash flows from investing activities	(48)	(45)
Repayments of Long-term Debt	1	0
Net cash flows from financing activities	(1)	0
Net change in cash and cash equivalents	29	31
Cash and cash equivalents at beginning of period	106	22
Cash and cash equivalents at end of period	$ 135	$ 53

General

General	3 Months Ended
	Mar. 31, 2016
Segment Reporting Information [Line Items]
General/Organization and Operations	General Berkshire Hathaway Energy Company (" BHE ") is a holding company that owns subsidiaries principally engaged in energy businesses (collectively with its subsidiaries, the "Company"). BHE is a consolidated subsidiary of Berkshire Hathaway Inc. ("Berkshire Hathaway"). The Company's operations are organized and managed 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 and HomeServices of America, Inc. (collectively with its subsidiaries, "HomeServices"). The Company, through these 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 March 31, 2016 and for the three-month periods ended March 31, 2016 and 2015 . The results of operations for the three-month period ended March 31, 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 the Company's Annual Report on Form 10-K for the year ended December 31, 2015 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 three-month period ended March 31, 2016 .
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 the states 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 March 31, 2016 and for the three-month periods ended March 31, 2016 and 2015 . The Consolidated Statements of Comprehensive Income have been omitted as net income equals comprehensive income for the three-month periods ended March 31, 2016 and 2015 . The results of operations for the three-month period ended March 31, 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, 2015 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 three-month period ended March 31, 2016 .
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 March 31, 2016 , and for the three-month periods ended March 31, 2016 and 2015 . Certain amounts in the prior period Financial Statements have been reclassified to conform to the current period presentation. Such reclassifications did not impact previously reported operating income, net income or retained earnings. The results of operations for the three-month periods ended March 31, 2016 , 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, 2015 , 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 three-month period ended March 31, 2016 .
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 March 31, 2016 , and for the three-month periods ended March 31, 2016 and 2015 . Certain amounts in the prior period Consolidated Financial Statements have been reclassified to conform to the current period presentation. Such reclassifications did not impact previously reported operating income, net income or retained earnings. The results of operations for the three-month periods ended March 31, 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 MidAmerican Funding's Annual Report on Form 10-K for the year ended December 31, 2015 , 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 three-month period ended March 31, 2016 .
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 March 31, 2016 and for the three-month periods ended March 31, 2016 and 2015 . The Consolidated Statements of Comprehensive Income have been omitted as net income equals comprehensive income for the three-month periods ended March 31, 2016 and 2015 . The results of operations for the three-month period ended March 31, 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 Nevada Power's Item 8 Notes to Consolidated Financial Statements included in BHE's Annual Report on Form 10-K for the year ended December 31, 2015 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 three-month period ended March 31, 2016 .
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 March 31, 2016 and for the three-month periods ended March 31, 2016 and 2015 . The Consolidated Statements of Comprehensive Income have been omitted as net income equals comprehensive income for the three-month periods ended March 31, 2016 and 2015 . The results of operations for the three-month period ended March 31, 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 Sierra Pacific's Item 8 Notes to Consolidated Financial Statements included in BHE's Annual Report on Form 10-K for the year ended December 31, 2015 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 three-month period ended March 31, 2016 .

New Accounting Pronouncements

New Accounting Pronouncements	3 Months Ended
	Mar. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	New Accounting Pronouncements In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-02, which creates FASB Accounting Standards Codification ("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 is currently evaluating the impact of adopting this guidance 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. 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. 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 is currently evaluating the impact of adopting this guidance on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements.
PacifiCorp [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	New Accounting Pronouncements In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-02, which creates FASB Accounting Standards Codification ("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 is currently evaluating the impact of adopting this guidance 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. 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. 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 is currently evaluating the impact of adopting this guidance on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements.
MidAmerican Energy Company [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	New Accounting Pronouncements In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-02, which creates FASB Accounting Standards Codification ("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 is currently evaluating the impact of adopting this guidance 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. 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. 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 is currently evaluating the impact of adopting this guidance on its Financial Statements and disclosures included within Notes to Financial Statements.
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 February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-02, which creates FASB Accounting Standards Codification ("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 is currently evaluating the impact of adopting this guidance 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. 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 is currently evaluating the impact of adopting this guidance on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements.
Sierra Pacific Power Company [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements	New Accounting Pronouncements In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-02, which creates FASB Accounting Standards Codification ("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 is currently evaluating the impact of adopting this guidance 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. 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 is currently evaluating the impact of adopting this guidance on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements.

Property, Plant and Equipment,

Property, Plant and Equipment, Net	3 Months Ended
	Mar. 31, 2016
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 March 31, December 31, Life 2016 2015 Regulated assets: Utility generation, transmission and distribution systems 5-80 years $ 69,880 $ 69,248 Interstate natural gas pipeline assets 3-80 years 6,798 6,755 76,678 76,003 Accumulated depreciation and amortization (23,084 ) (22,682 ) Regulated assets, net 53,594 53,321 Nonregulated assets: Independent power plants 5-30 years 4,781 4,751 Other assets 3-30 years 884 875 5,665 5,626 Accumulated depreciation and amortization (864 ) (805 ) Nonregulated assets, net 4,801 4,821 Net operating assets 58,395 58,142 Construction work-in-progress 2,757 2,627 Property, plant and equipment, net $ 61,152 $ 60,769 Construction work-in-progress includes $2.3 billion as of March 31, 2016 and December 31, 2015 , related to the construction of regulated assets.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Net	( 4 ) Property, Plant and Equipment, Net Refer to Note 4 of MidAmerican Energy's Notes to Financial Statements. In addition to MidAmerican Energy's property, plant and equipment, net, MidAmerican Funding had nonregulated property gross of $22 million as of March 31, 2016 and December 31, 2015 , and related accumulated depreciation and amortization of $8 million as of March 31, 2016 and December 31, 2015 , 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	( 4 ) Property, Plant and Equipment, Net Property, plant and equipment, net consists of the following (in millions): As of March 31, December 31, Depreciable Life 2016 2015 Utility plant in service, net: Generation 20-70 years $ 10,499 $ 10,404 Transmission 52-70 years 1,304 1,305 Electric distribution 20-70 years 3,086 3,059 Gas distribution 28-70 years 1,519 1,507 Utility plant in service 16,408 16,275 Accumulated depreciation and amortization (5,312 ) (5,229 ) Utility plant in service, net 11,096 11,046 Nonregulated property, net: Nonregulated property gross 5-45 years 7 15 Accumulated depreciation and amortization (1 ) (5 ) Nonregulated property, net 6 10 11,102 11,056 Construction work in progress 657 667 Property, plant and equipment, net $ 11,759 $ 11,723
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 March 31, December 31, Depreciable Life 2016 2015 Property, plant and equipment in-service 5-75 years $ 26,822 $ 26,757 Accumulated depreciation and amortization (8,485 ) (8,360 ) Net property, plant and equipment in-service 18,337 18,397 Construction work-in-progress 699 629 Total property, plant and equipment, net $ 19,036 $ 19,026
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 March 31, December 31, 2016 2015 Utility plant: Generation 25 - 80 years $ 4,228 $ 4,212 Distribution 20 - 65 years 3,148 3,118 Transmission 45 - 65 years 1,796 1,788 General and intangible plant 5 - 65 years 721 694 Utility plant 9,893 9,812 Accumulated depreciation and amortization (3,034 ) (2,971 ) Utility plant, net 6,859 6,841 Other non-regulated, net of accumulated depreciation and amortization 5 - 65 years 2 2 Plant, net 6,861 6,843 Construction work-in-progress 135 153 Property, plant and equipment, net $ 6,996 $ 6,996
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 March 31, December 31, 2016 2015 Utility plant: Electric generation 40 - 125 years $ 1,128 $ 1,134 Electric distribution 20 - 70 years 1,393 1,382 Electric transmission 50 - 70 years 748 739 Electric general and intangible plant 5 - 65 years 156 139 Natural gas distribution 40 - 70 years 375 374 Natural gas general and intangible plant 8 - 10 years 15 13 Common general 5 - 65 years 264 265 Utility plant 4,079 4,046 Accumulated depreciation and amortization (1,382 ) (1,368 ) Utility plant, net 2,697 2,678 Construction work-in-progress 73 88 Property, plant and equipment, net $ 2,770 $ 2,766

Regulatory Matters

Regulatory Matters	3 Months Ended
	Mar. 31, 2016
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 Public Utilities Commission of Nevada ("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.
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 Public Utilities Commission of Nevada ("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.

Investments and Restricted Cash

Investments and Restricted Cash and Investments	3 Months Ended
	Mar. 31, 2016
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 March 31, December 31, 2016 2015 Investments: BYD Company Limited common stock $ 1,291 $ 1,238 Rabbi trusts 384 380 Other 150 130 Total investments 1,825 1,748 Equity method investments: Electric Transmission Texas, LLC 609 585 BHE Renewables tax equity investments 429 168 Bridger Coal Company 185 190 Other 170 160 Total equity method investments 1,393 1,103 Restricted cash and investments: Quad Cities Station nuclear decommissioning trust funds 436 429 Solar Star and Topaz Projects 26 95 Other 161 129 Total restricted cash and investments 623 653 Total investments and restricted cash and investments $ 3,841 $ 3,504 Reflected as: Current assets $ 122 $ 137 Noncurrent assets 3,719 3,367 Total investments and restricted cash and investments $ 3,841 $ 3,504 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 $1.1 billion and $1.0 billion as of March 31, 2016 and December 31, 2015 , respectively.

Recent Financing Transactions

Recent Financing Transactions	3 Months Ended
	Mar. 31, 2016
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions Long-Term Debt In April 2016, Sierra Pacific issued $400 million of its 2.60% General and Refunding Securities, Series U, due May 2026. The net proceeds will be used, together with cash on hand, to pay at maturity the $450 million principal amount of 6.00% General and Refunding Securities, Series M, maturing in May 2016. In March 2016, BHE repaid at par value $500 million , plus accrued interest, of its junior subordinated debentures due December 2043. Credit Facilities In March 2016, Solar Star Funding, LLC amended its $320 million letter of credit facility reducing the amount available to $301 million and extending the maturity date to March 2026. As of March 31, 2016 , Solar Star Funding, LLC had $284 million of letters of credit issued under this facility.
Sierra Pacific Power Company [Member]
Debt Instrument [Line Items]
Recent Financing Transactions	Recent Financing Transactions In April 2016, Sierra Pacific issued $400 million of its 2.60% General and Refunding Securities, Series U, due May 2026. The net proceeds will be used, together with cash on hand, to pay at maturity the $450 million principal amount of 6.00% General and Refunding Securities, Series M, maturing in May 2016. In April 2016, Sierra Pacific repurchased at par value $58 million , plus accrued interest, of its Pollution Control Revenue Bonds Series 2006A, due 2031, and $75 million , plus accrued interest, of its Pollution Control Revenue Bonds Series 2006B, due 2036.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2016
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 Ended March 31, 2016 2015 Federal statutory income tax rate 35 % 35 % Income tax credits (14 ) (11 ) State income tax, net of federal income tax benefit (4 ) 2 Income tax effect of foreign income (5 ) (4 ) Equity income 2 2 Other, net — (2 ) Effective income tax rate 14 % 22 % 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. For the three-month periods ended March 31, 2016 and 2015 , the Company did not receive or make any cash payments for income taxes from or to Berkshire Hathaway.
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 from continuing operations is as follows: Three-Month Periods Ended March 31, 2016 2015 Federal statutory income tax rate 35 % 35 % Income tax credits (57 ) (63 ) State income tax, net of federal income tax benefit 5 4 Effects of ratemaking (12 ) (11 ) Other, net — (1 ) Effective income tax rate (29 )% (36 )% 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 $4 million and $- million for the three-month periods ended March 31, 2016 and 2015 , respectively.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Income Taxes	ncome 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 from continuing operations is as follows: Three-Month Periods Ended March 31, 2016 2015 Federal statutory income tax rate 35 % 35 % Income tax credits (62 ) (55 ) State income tax, net of federal income tax benefit 5 3 Effects of ratemaking (14 ) (10 ) Other, net 1 (1 ) Effective income tax rate (35 )% (28 )% 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 $4 million and $- million for the three-month periods ended March 31, 2016 and 2015 , respectively.

Employee Benefit Plans

Employee Benefit Plans	3 Months Ended
	Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Employee Benefit Plans	Employee Benefit Plans Domestic Operations Net periodic benefit cost for the domestic pension and other postretirement benefit plans included the following components (in millions): Three-Month Periods Ended March 31, 2016 2015 Pension: Service cost $ 8 $ 8 Interest cost 31 30 Expected return on plan assets (40 ) (42 ) Net amortization 11 13 Net periodic benefit cost $ 10 $ 9 Other postretirement: Service cost $ 3 $ 4 Interest cost 8 7 Expected return on plan assets (11 ) (12 ) Net amortization (3 ) (3 ) Net periodic benefit credit $ (3 ) $ (4 ) Employer contributions to the domestic pension and other postretirement benefit plans are expected to be $34 million and $1 million , respectively, during 2016 . As of March 31, 2016 , $3 million and $- 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 Ended March 31, 2016 2015 Service cost $ 5 $ 6 Interest cost 19 20 Expected return on plan assets (29 ) (29 ) Net amortization 12 16 Net periodic benefit cost $ 7 $ 13 Employer contributions to the United Kingdom pension plan are expected to be £40 million during 2016 . As of March 31, 2016 , £12 million , or $17 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 cost for the pension and other postretirement benefit plans included the following components (in millions): Three-Month Periods Ended March 31, 2016 2015 Pension: Service cost $ 1 $ 1 Interest cost 14 13 Expected return on plan assets (19 ) (19 ) Net amortization 8 10 Net periodic benefit cost $ 4 $ 5 Other postretirement: Service cost $ 1 $ 1 Interest cost 4 4 Expected return on plan assets (6 ) (6 ) Net amortization (1 ) (1 ) Net periodic benefit credit $ (2 ) $ (2 ) Employer contributions to the pension and other postretirement benefit plans are expected to be $4 million and $- million, respectively, during 2016 . As of March 31, 2016 , $1 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 cost (credit) for the plans of MidAmerican Energy and the aforementioned affiliates included the following components (in millions): Three-Month Periods Ended March 31, 2016 2015 Pension: Service cost $ 3 $ 3 Interest cost 8 8 Expected return on plan assets (11 ) (11 ) Net periodic benefit cost $ — $ — Other postretirement: Service cost $ 1 $ 2 Interest cost 2 2 Expected return on plan assets (3 ) (4 ) Net amortization (1 ) (1 ) Net periodic benefit credit $ (1 ) $ (1 ) Employer contributions to the pension and other postretirement benefit plans are expected to be $8 million and $1 million , respectively, during 2016 . As of March 31, 2016 , $2 million and $- 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	mployee 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. 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 March 31, December 31, 2016 2015 Qualified Pension Plan - Other long-term liabilities $ (40 ) $ (38 ) Non-Qualified Pension Plans: Other current liabilities (1 ) (1 ) Other long-term liabilities (9 ) (9 ) Other Postretirement Plans - Other long-term liabilities (5 ) (5 )
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. 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 March 31, December 31, 2016 2015 Qualified Pension Plan - Other long-term liabilities $ (29 ) $ (29 ) Non-Qualified Pension Plans: Other current liabilities (1 ) (1 ) Other long-term liabilities (9 ) (9 ) Other Postretirement Plans - Other long-term liabilities (32 ) (32 )

Risk Management and Hedging Act

Risk Management and Hedging Activities	3 Months Ended
	Mar. 31, 2016
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 Company, Nevada Power Company and Sierra Pacific Power Company (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, mitigate, 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 9 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 March 31, 2016 Not designated as hedging contracts: Commodity assets (1) $ 20 $ 85 $ 11 $ 2 $ 118 Commodity liabilities (1) (1 ) — (117 ) (174 ) (292 ) Interest rate assets 11 — — — 11 Interest rate liabilities — — (5 ) (12 ) (17 ) Total 30 85 (111 ) (184 ) (180 ) Designated as hedging contracts: Commodity assets — — — — — Commodity liabilities — — (47 ) (26 ) (73 ) Interest rate assets — — — — — Interest rate liabilities — — (4 ) (7 ) (11 ) Total — — (51 ) (33 ) (84 ) Total derivatives 30 85 (162 ) (217 ) (264 ) Cash collateral receivable — — 47 66 113 Total derivatives - net basis $ 30 $ 85 $ (115 ) $ (151 ) $ (151 ) Other Other Other Current Other Current Long-term Assets Assets Liabilities Liabilities Total As of December 31, 2015 Not designated as hedging contracts: Commodity assets (1) $ 25 $ 72 $ 7 $ 2 $ 106 Commodity liabilities (1) (4 ) — (113 ) (175 ) (292 ) Interest rate assets 7 — — — 7 Interest rate liabilities — — (3 ) (6 ) (9 ) Total 28 72 (109 ) (179 ) (188 ) Designated as hedging contracts: Commodity assets — — 1 2 3 Commodity liabilities — — (33 ) (17 ) (50 ) Interest rate assets — 3 — — 3 Interest rate liabilities — — (4 ) (1 ) (5 ) Total — 3 (36 ) (16 ) (49 ) Total derivatives 28 75 (145 ) (195 ) (237 ) Cash collateral receivable — — 40 63 103 Total derivatives - net basis $ 28 $ 75 $ (105 ) $ (132 ) $ (134 ) (1) The Company's commodity derivatives not designated as hedging contracts are generally included in regulated rates, and as of March 31, 2016 and December 31, 2015 , a net regulatory asset of $253 million and $250 million , respectively, was recorded related to the net derivative liability of $174 million and $186 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 Ended March 31, 2016 2015 Beginning balance $ 250 $ 223 Changes in fair value recognized in net regulatory assets 36 60 Net gains reclassified to operating revenue — 9 Net losses reclassified to cost of sales (33 ) (37 ) Ending balance $ 253 $ 255 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 other comprehensive income ("OCI"), as well as amounts reclassified to earnings (in millions): Three-Month Periods Ended March 31, 2016 2015 Beginning balance $ 46 $ 32 Changes in fair value recognized in OCI 48 (8 ) Net gains reclassified to operating revenue — 1 Net (losses) gains reclassified to cost of sales (22 ) 2 Ending balance $ 72 $ 27 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-month periods ended March 31, 2016 and 2015 , hedge ineffectiveness was insignificant. As of March 31, 2016 , the Company had cash flow hedges with expiration dates extending through September 2025 and $51 million of pre-tax unrealized losses are forecasted to be reclassified from AOCI into earnings over the next twelve months as contracts settle. Derivative Contract Volumes The following table summarizes the net notional amounts of outstanding derivative contracts with fixed price terms that comprise the mark-to-market values as of (in millions): Unit of March 31, December 31, Measure 2016 2015 Electricity purchases Megawatt hours 11 10 Natural gas purchases Decatherms 360 317 Fuel purchases Gallons 9 11 Interest rate swaps US$ 653 653 Mortgage sale commitments, net US$ (213 ) (312 ) 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 March 31, 2016 , 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 $309 million and $288 million as of March 31, 2016 and December 31, 2015 , respectively, for which the Company had posted collateral of $78 million and $75 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 March 31, 2016 and December 31, 2015 , the Company would have been required to post $220 million and $198 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	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, mitigate, 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 6 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 March 31, 2016 Not designated as hedging contracts (1) : Commodity assets $ 5 $ — $ 2 $ — $ 7 Commodity liabilities (1 ) — (65 ) (89 ) (155 ) Total 4 — (63 ) (89 ) (148 ) Total derivatives 4 — (63 ) (89 ) (148 ) Cash collateral receivable — — 19 59 78 Total derivatives - net basis $ 4 $ — $ (44 ) $ (30 ) $ (70 ) As of December 31, 2015 Not designated as hedging contracts (1) : Commodity assets $ 10 $ — $ 2 $ — $ 12 Commodity liabilities (1 ) — (58 ) (89 ) (148 ) Total 9 — (56 ) (89 ) (136 ) Total derivatives 9 — (56 ) (89 ) (136 ) Cash collateral receivable — — 18 57 75 Total derivatives - net basis $ 9 $ — $ (38 ) $ (32 ) $ (61 ) (1) PacifiCorp's commodity derivatives are generally included in rates and as of March 31, 2016 and December 31, 2015 , a regulatory asset of $144 million and $133 million , respectively, was recorded related to the net derivative liability of $148 million and $136 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 Ended March 31, 2016 2015 Beginning balance $ 133 $ 85 Changes in fair value recognized in net regulatory assets 26 48 Net gains reclassified to operating revenue 8 25 Net losses reclassified to energy costs (23 ) (28 ) Ending balance $ 144 $ 130 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 March 31, December 31, Measure 2016 2015 Electricity purchases Megawatt hours 2 1 Natural gas purchases Decatherms 107 111 Fuel oil purchases Gallons 9 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 March 31, 2016 , 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 $149 million and $142 million as of March 31, 2016 and December 31, 2015 , respectively, for which PacifiCorp had posted collateral of $78 million and $75 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 March 31, 2016 and December 31, 2015 , PacifiCorp would have been required to post $68 million and $64 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.
MidAmerican Energy Company [Member]
Derivative [Line Items]
Risk Management and Hedging Activities	Risk Management and Hedging Activities MidAmerican Energy is exposed to the impact of market fluctuations in commodity prices and interest rates. MidAmerican Energy 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 territory. Prior to January 1, 2016, MidAmerican Energy also provided nonregulated retail electricity and natural gas services in competitive markets, which created contractual obligations to provide electric and natural gas services. MidAmerican Energy'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, 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 and future debt issuances. MidAmerican Energy does not engage in a material amount of proprietary trading activities. MidAmerican Energy has established a risk management process that is designed to identify, assess, manage, mitigate, monitor and report each of the various types of risk involved in its business. To mitigate a portion of its commodity price risk, MidAmerican Energy 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. MidAmerican Energy 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, MidAmerican Energy may from time to time enter into interest rate derivative contracts, such as interest rate swaps or locks, to mitigate its exposure to interest rate risk. MidAmerican Energy 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 MidAmerican Energy's accounting policies related to derivatives. Refer to Note 8 for additional information on derivative contracts and to Note 3 for a discussion of discontinued operations. 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 MidAmerican Energy's derivative contracts, on a gross basis, and reconciles those amounts to the amounts presented on a net basis on the Balance Sheets (in millions): Other Current Assets Other Assets Other Current Liabilities Other Long-term Liabilities Total As of March 31, 2016: Not designated as hedging contracts (1)(2) : Commodity assets $ 3 $ — $ 1 $ — $ 4 Commodity liabilities — — (11 ) (1 ) (12 ) Total 3 — (10 ) (1 ) (8 ) Designated as hedging contracts (2) : Commodity assets — — — — — Commodity liabilities — — — — — Total — — — — — Total derivatives 3 — (10 ) (1 ) (8 ) Cash collateral receivable — — 6 — 6 Total derivatives - net basis $ 3 $ — $ (4 ) $ (1 ) $ (2 ) As of December 31, 2015: Not designated as hedging contracts (1) : Commodity assets $ 12 $ 4 $ 5 $ 2 $ 23 Commodity liabilities (3 ) — (36 ) (10 ) (49 ) Total 9 4 (31 ) (8 ) (26 ) Designated as hedging contracts: Commodity assets — — 1 2 3 Commodity liabilities — — (32 ) (17 ) (49 ) Total — — (31 ) (15 ) (46 ) Total derivatives 9 4 (62 ) (23 ) (72 ) Cash collateral receivable — — 22 6 28 Total derivatives - net basis $ 9 $ 4 $ (40 ) $ (17 ) $ (44 ) (1) MidAmerican Energy's commodity derivatives not designated as hedging contracts are generally included in regulated rates, and as of March 31, 2016 and December 31, 2015 , a net regulatory asset of $11 million and $20 million , respectively, was recorded related to the net derivative liability of $8 million and $26 million , respectively. (2) The changes in derivative values from December 31, 2015, are substantially due to the transfer of MidAmerican Energy's unregulated retail services business to a subsidiary of BHE. Not Designated as Hedging Contracts The following table reconciles the beginning and ending balances of MidAmerican Energy'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 Ended March 31, 2016 2015 Beginning balance $ 20 $ 38 Changes in fair value recognized in net regulatory assets 6 2 Net losses reclassified to operating revenue (8 ) (16 ) Net losses reclassified to cost of gas sold (7 ) (6 ) Ending balance $ 11 $ 18 Designated as Hedging Contracts MidAmerican Energy used commodity derivative contracts accounted for as cash flow hedges to hedge electricity and natural gas commodity prices related to its unregulated retail services business, which was transferred to a subsidiary of BHE. The following table reconciles the beginning and ending balances of MidAmerican Energy's accumulated other comprehensive loss (pre-tax) and summarizes pre-tax gains and losses on commodity derivative contracts designated and qualifying as cash flow hedges recognized in other comprehensive income ("OCI"), as well as amounts reclassified to earnings (in millions): Three-Month Periods Ended March 31, 2016 2015 Beginning balance $ 45 $ 34 Transfer to affiliate (45 ) — Changes in fair value recognized in OCI — (6 ) Net gains reclassified to nonregulated cost of sales — 2 Ending balance $ — $ 30 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 March 31, December 31, Measure 2016 2015 Electricity purchases Megawatt hours — 15 Natural gas purchases Decatherms 12 17 Credit Risk MidAmerican Energy 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 MidAmerican Energy's counterparties have similar economic, industry or other characteristics and due to direct or indirect relationships among the counterparties. Before entering into a transaction, MidAmerican Energy 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, MidAmerican Energy 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, MidAmerican Energy 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 MidAmerican Energy's collateral requirements on its 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 MidAmerican Energy's creditworthiness. These rights can vary by contract and by counterparty. As of March 31, 2016 , MidAmerican Energy's credit ratings from the three recognized credit rating agencies were investment grade. The aggregate fair value of MidAmerican Energy's derivative contracts in liability positions with specific credit-risk-related contingent features totaled $7 million and $66 million as of March 31, 2016 and December 31, 2015 , respectively, for which MidAmerican Energy had posted collateral of $- million at each date. If all credit-risk-related contingent features for derivative contracts in liability positions had been triggered as of March 31, 2016 and December 31, 2015 , MidAmerican Energy would have been required to post $4 million and $55 million , respectively, of additional collateral. MidAmerican Energy's collateral requirements could fluctuate considerably due to market price volatility, changes in credit ratings, changes in legislation or regulation, or other factors. MidAmerican Energy's exposure to contingent features declined significantly as a result of the transfer of its unregulated retail services business to a subsidiary of BHE.
MidAmerican Funding, LLC and Subsidiaries [Domain]
Derivative [Line Items]
Risk Management and Hedging Activities	isk Management and Hedging Activities Refer to Note 7 of MidAmerican Energy's Notes to Financial Statements.
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, mitigate, 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 7 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 March 31, 2016 Commodity liabilities (1) $ (9 ) $ (13 ) $ (22 ) As of December 31, 2015 Commodity liabilities (1) $ (8 ) $ (14 ) $ (22 ) (1) Nevada Power's commodity derivatives not designated as hedging contracts are included in regulated rates and as of March 31, 2016 and December 31, 2015 , a regulatory asset of $22 million was recorded related to the derivative liability of $22 million . 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 as of (in millions): Unit of March 31, December 31, Measure 2016 2015 Electricity sales Megawatt hours (2 ) (2 ) Natural gas purchases Decatherms 169 126 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 March 31, 2016 , 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 $4 million and $3 million as of March 31, 2016 and December 31, 2015 , respectively, 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	3 Months Ended
	Mar. 31, 2016
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 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 March 31, 2016 Assets: Commodity derivatives $ — $ 17 $ 101 $ (14 ) $ 104 Interest rate derivatives — — 11 — 11 Mortgage loans held for sale — 237 — — 237 Money market mutual funds (2) 504 — — — 504 Debt securities: United States government obligations 142 — — — 142 International government obligations — 2 — — 2 Corporate obligations — 34 — — 34 Municipal obligations — 2 — — 2 Agency, asset and mortgage-backed obligations — 4 — — 4 Auction rate securities — — 26 — 26 Equity securities: United States companies 242 — — — 242 International companies 1,298 — — — 1,298 Investment funds 161 — — — 161 $ 2,347 $ 296 $ 138 $ (14 ) $ 2,767 Liabilities: Commodity derivatives $ (10 ) $ (312 ) $ (43 ) $ 127 $ (238 ) Interest rate derivatives — (28 ) — — (28 ) $ (10 ) $ (340 ) $ (43 ) $ 127 $ (266 ) As of December 31, 2015 Assets: Commodity derivatives $ — $ 16 $ 93 $ (16 ) $ 93 Interest rate derivatives — 5 5 — 10 Mortgage loans held for sale — 327 — — 327 Money market mutual funds (2) 421 — — — 421 Debt securities: United States government obligations 133 — — — 133 International government obligations — 2 — — 2 Corporate obligations — 39 — — 39 Municipal obligations — 1 — — 1 Agency, asset and mortgage-backed obligations — 3 — — 3 Auction rate securities — — 44 — 44 Equity securities: United States companies 239 — — — 239 International companies 1,244 — — — 1,244 Investment funds 136 — — — 136 $ 2,173 $ 393 $ 142 $ (16 ) $ 2,692 Liabilities: Commodity derivatives $ (13 ) $ (283 ) $ (46 ) $ 119 $ (223 ) Interest rate derivatives — (13 ) (1 ) — (14 ) $ (13 ) $ (296 ) $ (47 ) $ 119 $ (237 ) (1) Represents netting under master netting arrangements and a net cash collateral receivable of $113 million and $103 million as of March 31, 2016 and December 31, 2015 , 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 8 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 fair value of the Company's investments in auction rate securities, where there is no current liquid market, is determined using pricing models based on available observable market data and the Company's judgment about the assumptions, including liquidity and nonperformance risks, which market participants would use when pricing the asset. 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 Ended March 31, Interest Auction Commodity Rate Rate Derivatives Derivatives Securities 2016: Beginning balance $ 47 $ 4 $ 44 Changes included in earnings 19 25 — Changes in fair value recognized in OCI (6 ) — 4 Changes in fair value recognized in net regulatory assets (6 ) — — Redemptions — — (22 ) Settlements 4 (18 ) — Ending balance $ 58 $ 11 $ 26 Three-Month Periods Ended March 31, Interest Auction Commodity Rate Rate Derivatives Derivatives Securities 2015: Beginning balance $ 51 $ — $ 45 Changes included in earnings 8 21 — Changes in fair value recognized in OCI 1 — (1 ) Changes in fair value recognized in net regulatory assets (3 ) — — Settlements (8 ) (16 ) — Transfers from Level 2 — 3 — Ending balance $ 49 $ 8 $ 44 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 March 31, 2016 As of December 31, 2015 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 37,313 $ 42,878 $ 37,972 $ 41,785
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 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 March 31, 2016 Assets: Commodity derivatives $ — $ 6 $ 1 $ (3 ) $ 4 Money market mutual funds (2) 178 — — — 178 Investment funds 15 — — — 15 $ 193 $ 6 $ 1 $ (3 ) $ 197 Liabilities - Commodity derivatives $ — $ (155 ) $ — $ 81 $ (74 ) As of December 31, 2015 Assets: Commodity derivatives $ — $ 9 $ 3 $ (3 ) $ 9 Money market mutual funds (2) 13 — — — 13 Investment funds 15 — — — 15 $ 28 $ 9 $ 3 $ (3 ) $ 37 Liabilities - Commodity derivatives $ — $ (148 ) $ — $ 78 $ (70 ) (1) Represents netting under master netting arrangements and a net cash collateral receivable of $78 million and $75 million as of March 31, 2016 and December 31, 2015 , 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 5 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 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. 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 March 31, 2016 As of December 31, 2015 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 7,061 $ 8,437 $ 7,114 $ 8,210
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 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 March 31, 2016: Assets: Commodity derivatives $ — $ 3 $ 1 $ (1 ) $ 3 Money market mutual funds (2) 4 — — — 4 Debt securities: United States government obligations 142 — — — 142 International government obligations — 2 — — 2 Corporate obligations — 34 — — 34 Municipal obligations — 2 — — 2 Agency, asset and mortgage-backed obligations — 4 — — 4 Auction rate securities — — 26 — 26 Equity securities: United States companies 242 — — — 242 International companies 7 — — — 7 Investment funds 9 — — — 9 $ 404 $ 45 $ 27 $ (1 ) $ 475 Liabilities - commodity derivatives $ (3 ) $ (4 ) $ (5 ) $ 7 $ (5 ) As of December 31, 2015: Assets: Commodity derivatives $ — $ 8 $ 18 $ (13 ) $ 13 Money market mutual funds (2) 56 — — — 56 Debt securities: United States government obligations 133 — — — 133 International government obligations — 2 — — 2 Corporate obligations — 39 — — 39 Municipal obligations — 1 — — 1 Agency, asset and mortgage-backed obligations — 3 — — 3 Auction rate securities — — 26 — 26 Equity securities: United States companies 239 — — — 239 International companies 6 — — — 6 Investment funds 4 — — — 4 $ 438 $ 53 $ 44 $ (13 ) $ 522 Liabilities - commodity derivatives $ (13 ) $ (61 ) $ (24 ) $ 41 $ (57 ) (1) Represents netting under master netting arrangements and a net cash collateral receivable of $6 million and $28 million as of March 31, 2016 and December 31, 2015 , 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. Refer to Note 7 for further discussion regarding MidAmerican Energy's risk management and hedging activities. 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 fair value of MidAmerican Energy's investments in auction rate securities, where there is no current liquid market, is determined using pricing models based on available observable market data and MidAmerican Energy's judgment about the assumptions, including liquidity and nonperformance risks, which market participants would use when pricing the asset. 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 Ended March 31, Commodity Derivatives Auction Rate Securities 2016: Beginning balance $ (6 ) $ 26 Transfer to affiliate (4 ) — Changes in fair value recognized in OCI — 1 Changes in fair value recognized in net regulatory assets (1 ) — Sales — (1 ) Settlements 7 — Ending balance $ (4 ) $ 26 2015: Beginning balance $ 12 $ 26 Changes included in earnings 2 — Changes in fair value recognized in OCI 1 — Settlements (6 ) — Ending balance $ 9 $ 26 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 March 31, 2016 As of December 31, 2015 Carrying Value Fair Value Carrying Value Fair Value Long-term debt $ 4,268 $ 4,847 $ 4,271 $ 4,636
MidAmerican Funding, LLC and Subsidiaries [Domain]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements	air Value Measurements Refer to Note 8 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 March 31, 2016 As of December 31, 2015 Carrying Value Fair Value Carrying Value Fair Value Long-term debt $ 4,594 $ 5,280 $ 4,597 $ 5,051
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 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 March 31, 2016 Assets - investment funds $ 5 $ — $ — $ 5 Liabilities - commodity derivatives $ — $ — $ (22 ) $ (22 ) As of December 31, 2015 Assets - investment funds $ 5 $ — $ — $ 5 Liabilities - commodity derivatives $ — $ — $ (22 ) $ (22 ) 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. Interest rate swaps are valued using a financial model which utilizes observable inputs for similar instruments based primarily on market price curves. 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 March 31, 2016 and December 31, 2015 , 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 6 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 Ended March 31, 2016 2015 Beginning balance $ (22 ) $ (30 ) Changes in fair value recognized in regulatory assets (3 ) (4 ) Settlements 3 2 Ending balance $ (22 ) $ (32 ) 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 March 31, 2016 As of December 31, 2015 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 2,579 $ 3,141 $ 2,788 $ 3,240
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, investments held in Rabbi trusts, 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, principally related to derivative contracts, 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. 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 March 31, 2016 As of December 31, 2015 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 1,166 $ 1,278 $ 1,165 $ 1,248

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2016
Loss Contingencies [Line Items]
Commitments and Contingencies	Commitments and Contingencies 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. USA Power In October 2005, prior to BHE's ownership of PacifiCorp, PacifiCorp was added as a defendant to a lawsuit originally filed in February 2005 in the Third District Court of Salt Lake County, Utah ("Third District Court") by USA Power, LLC, USA Power Partners, LLC and Spring Canyon Energy, LLC (collectively, the "Plaintiff"). The Plaintiff's complaint alleged that PacifiCorp misappropriated confidential proprietary information in violation of Utah's Uniform Trade Secrets Act and accused PacifiCorp of breach of contract and related claims in regard to the Plaintiff's 2002 and 2003 proposals to build a natural gas-fueled generating facility in Juab County, Utah. In October 2007, the Third District Court granted PacifiCorp's motion for summary judgment on all counts and dismissed the Plaintiff's claims in their entirety. In a May 2010 ruling on the Plaintiff's petition for reconsideration, the Utah Supreme Court reversed summary judgment and remanded the case back to the Third District Court for further consideration. In May 2012, a jury awarded damages to the Plaintiff for breach of contract and misappropriation of a trade secret in the amounts of $18 million for actual damages and $113 million for unjust enrichment. After considering various motions filed by the parties to expand or limit damages, interest and attorney's fees, in May 2013, the court entered a final judgment against PacifiCorp in the amount of $115 million , which includes the $113 million of aggregate damages previously awarded and amounts awarded for the Plaintiff's attorneys' fees. The final judgment also ordered that postjudgment interest accrue beginning as of the date of the April 2013 initial judgment. In May 2013, PacifiCorp posted a surety bond issued by a subsidiary of Berkshire Hathaway to secure its estimated obligation. PacifiCorp strongly disagrees with the jury's verdict and is vigorously pursuing all appellate measures. Both PacifiCorp and the Plaintiff filed appeals with the Utah Supreme Court. Briefing before the Utah Supreme Court is complete and oral arguments were heard in September 2015. As of March 31, 2016 , PacifiCorp had accrued $122 million for the final judgment and postjudgment interest, and believes the likelihood of any additional material loss is remote; however, any additional awards against PacifiCorp could also have a material effect on the consolidated financial results. Any payment of damages will be at the end of the appeals process. 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 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"). Among other things, the KHSA provided that the United States Department of the Interior would conduct scientific and engineering studies to assess whether removal of the Klamath hydroelectric system's mainstem dams was in the public interest and would advance restoration of the Klamath Basin's salmonid fisheries. If it was determined that dam removal should proceed, dam removal would have begun no earlier than 2020. Under the KHSA, PacifiCorp and its customers were protected from uncapped dam removal costs and liabilities. For dam removal to occur, federal legislation consistent with the KHSA was required to provide, among other things, protection for PacifiCorp from all liabilities associated with dam removal activities. As of December 31, 2015, no federal legislation had been enacted, and several parties to the KHSA initiated a dispute resolution process. In February 2016, the principal parties to the KHSA (PacifiCorp, the states of California and Oregon and the United States Departments of the Interior and Commerce) executed an agreement in principle committing to explore potential amendment of the KHSA to facilitate removal of the Klamath dams through a FERC process without the need for federal legislation. Since that time, PacifiCorp, the states of California and Oregon, and the United States Departments of the Interior and Commerce have negotiated an amendment to the KHSA that was signed on April 6, 2016. Under the amended KHSA, PacifiCorp will file an application with the FERC to transfer the license for the four mainstem Klamath River hydroelectric generating facilities to a newly formed private entity, the Klamath River Renewal Corporation ("KRRC"). The KRRC will file an application to surrender the license and decommission the facilities with the FERC. The amended KHSA provides PacifiCorp with liability protections comparable to the KHSA. 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. Additional funding of up to $250 million for facilities removal costs is to be provided by the state of California. California voters approved a water bond measure in November 2014 from which the state of California's contribution toward facilities removal costs will be drawn. 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 in order for facilities 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. PacifiCorp 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. USA Power In October 2005, prior to BHE's ownership of PacifiCorp, PacifiCorp was added as a defendant to a lawsuit originally filed in February 2005 in the Third District Court of Salt Lake County, Utah ("Third District Court") by USA Power, LLC, USA Power Partners, LLC and Spring Canyon Energy, LLC (collectively, the "Plaintiff"). The Plaintiff's complaint alleged that PacifiCorp misappropriated confidential proprietary information in violation of Utah's Uniform Trade Secrets Act and accused PacifiCorp of breach of contract and related claims in regard to the Plaintiff's 2002 and 2003 proposals to build a natural gas-fueled generating facility in Juab County, Utah. In October 2007, the Third District Court granted PacifiCorp's motion for summary judgment on all counts and dismissed the Plaintiff's claims in their entirety. In a May 2010 ruling on the Plaintiff's petition for reconsideration, the Utah Supreme Court reversed summary judgment and remanded the case back to the Third District Court for further consideration. In May 2012, a jury awarded damages to the Plaintiff for breach of contract and misappropriation of a trade secret in the amounts of $18 million for actual damages and $113 million for unjust enrichment. After considering various motions filed by the parties to expand or limit damages, interest and attorney's fees, in May 2013, the court entered a final judgment against PacifiCorp in the amount of $115 million , which includes the $113 million of aggregate damages previously awarded and amounts awarded for the Plaintiff's attorneys' fees. The final judgment also ordered that postjudgment interest accrue beginning as of the date of the April 2013 initial judgment. In May 2013, PacifiCorp posted a surety bond issued by a subsidiary of Berkshire Hathaway to secure its estimated obligation. PacifiCorp strongly disagrees with the jury's verdict and is vigorously pursuing all appellate measures. Both PacifiCorp and the Plaintiff filed appeals with the Utah Supreme Court. Briefing before the Utah Supreme Court is complete and oral arguments were heard in September 2015. As of March 31, 2016 , PacifiCorp had accrued $122 million for the final judgment and postjudgment interest, and believes the likelihood of any additional material loss is remote; however, any additional awards against PacifiCorp could also have a material effect on the consolidated financial results. Any payment of damages will be at the end of the appeals process. Sanpete County, Utah Rangeland Fire In June 2012, a major rangeland fire occurred in Sanpete County, Utah. Certain parties allege that contact between two of PacifiCorp's transmission lines may have triggered a ground fault that led to the fire. PacifiCorp has engaged experts to review the cause and origin of the fire, as well as to assess the damages. PacifiCorp has accrued its best estimate of the potential loss and expected insurance recovery. PacifiCorp believes it is reasonably possible it may incur additional loss beyond the amount accrued, but does not believe the potential additional loss 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"). Among other things, the KHSA provided that the United States Department of the Interior would conduct scientific and engineering studies to assess whether removal of the Klamath hydroelectric system's mainstem dams was in the public interest and would advance restoration of the Klamath Basin's salmonid fisheries. If it was determined that dam removal should proceed, dam removal would have begun no earlier than 2020. Under the KHSA, PacifiCorp and its customers were protected from uncapped dam removal costs and liabilities. For dam removal to occur, federal legislation consistent with the KHSA was required to provide, among other things, protection for PacifiCorp from all liabilities associated with dam removal activities. As of December 31, 2015, no federal legislation had been enacted, and several parties to the KHSA initiated a dispute resolution process. In February 2016, the principal parties to the KHSA (PacifiCorp, the states of California and Oregon and the United States Departments of the Interior and Commerce) executed an agreement in principle committing to explore potential amendment of the KHSA to facilitate removal of the Klamath dams through a FERC process without the need for federal legislation. Since that time, PacifiCorp, the states of California and Oregon, and the United States Departments of the Interior and Commerce have negotiated an amendment to the KHSA that was signed on April 6, 2016. Under the amended KHSA, PacifiCorp will file an application with the FERC to transfer the license for the four mainstem Klamath River hydroelectric generating facilities to a newly formed private entity, the Klamath River Renewal Corporation ("KRRC"). The KRRC will file an application to surrender the license and decommission the facilities with the FERC. The amended KHSA provides PacifiCorp with liability protections comparable to the KHSA. 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. Additional funding of up to $250 million for facilities removal costs is to be provided by the state of California. California voters approved a water bond measure in November 2014 from which the state of California's contribution toward facilities removal costs will be drawn. 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 in order for facilities 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.
MidAmerican Energy Company [Member]
Loss Contingencies [Line Items]
Commitments and Contingencies	Commitments and Contingencies 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.
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 9 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 and other generating facilities. In May 2014, Nevada Power filed its Emissions Reduction Capacity Replacement Plan ("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 direction provided by the PUCN, Nevada Power acquired a 272 -megawatt ("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 and contracted two renewable power purchase agreements with 100 -MW solar photovoltaic generating facilities in 2015. In February 2016, Nevada Power solicited proposals to acquire 35 MW of nameplate renewable energy capacity to be owned by Nevada Power and solicited a long-term power purchase agreement for a minimum of 100 MW of nameplate renewable energy capacity in Nevada. These solicitations are related to Nevada Power's final steps to comply 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	3 Months Ended
	Mar. 31, 2016
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, 2014 $ (490 ) $ (412 ) $ 390 $ 18 $ (494 ) Other comprehensive income (loss) 22 (424 ) 166 1 (235 ) Balance, March 31, 2015 $ (468 ) $ (836 ) $ 556 $ 19 $ (729 ) Balance, December 31, 2015 $ (438 ) $ (1,092 ) $ 615 $ 7 $ (908 ) Other comprehensive income (loss) 22 67 33 (23 ) 99 Balance, March 31, 2016 $ (416 ) $ (1,025 ) $ 648 $ (16 ) $ (809 ) Reclassifications from AOCI to net income for the periods ended March 31, 2016 and 2015 were insignificant. For information regarding cash flow hedge reclassifications from AOCI to net income in their entirety, refer to Note 8 . Additionally, refer to the "Foreign Operations" discussion in Note 7 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 ("AOCI") 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, 2014 $ (3 ) $ (20 ) $ (23 ) Other comprehensive income — 2 2 Balance at March 31, 2015 $ (3 ) $ (18 ) $ (21 ) Balance, December 31, 2015 $ (3 ) $ (27 ) $ (30 ) Other comprehensive income 1 — 1 Dividend (Note 3) — 27 27 Balance, March 31, 2016 $ (2 ) $ — $ (2 ) For information regarding cash flow hedge reclassifications from AOCI to net income in their entirety, refer to Note 7 .
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 10 of MidAmerican Energy's Notes to Financial Statements.

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2016
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. Effective January 1, 2016, MidAmerican Energy transferred the assets and liabilities of its unregulated retail services business to a subsidiary of BHE . Prior period amounts have been changed to reflect this activity in BHE and Other . Information related to the Company's reportable segments is shown below (in millions): Three-Month Periods Ended March 31, 2016 2015 Operating revenue: PacifiCorp $ 1,252 $ 1,250 MidAmerican Funding 626 727 NV Energy 615 706 Northern Powergrid 279 324 BHE Pipeline Group 315 332 BHE Transmission 158 125 BHE Renewables 139 124 HomeServices 491 448 BHE and Other (1) 166 185 Total operating revenue $ 4,041 $ 4,221 Depreciation and amortization: PacifiCorp $ 197 $ 194 MidAmerican Funding 110 100 NV Energy 104 101 Northern Powergrid 50 48 BHE Pipeline Group 53 50 BHE Transmission 50 38 BHE Renewables 56 49 HomeServices 6 6 BHE and Other (1) — 1 Total depreciation and amortization $ 626 $ 587 Three-Month Periods Ended March 31, 2016 2015 Operating income: PacifiCorp $ 324 $ 273 MidAmerican Funding 100 101 NV Energy 89 121 Northern Powergrid 158 193 BHE Pipeline Group 192 200 BHE Transmission 76 46 BHE Renewables 24 6 HomeServices (1 ) (2 ) BHE and Other (1) (9 ) (8 ) Total operating income 953 930 Interest expense (473 ) (472 ) Capitalized interest 11 29 Allowance for equity funds 15 31 Interest and dividend income 27 26 Other, net 10 26 Total income before income tax expense and equity income $ 543 $ 570 Interest expense: PacifiCorp $ 95 $ 95 MidAmerican Funding 54 50 NV Energy 67 63 Northern Powergrid 36 35 BHE Pipeline Group 13 18 BHE Transmission 36 36 BHE Renewables 49 46 HomeServices 1 1 BHE and Other (1) 122 128 Total interest expense $ 473 $ 472 Operating revenue by country: United States $ 3,599 $ 3,769 United Kingdom 279 324 Canada 160 127 Philippines and other 3 1 Total operating revenue by country $ 4,041 $ 4,221 Income before income tax expense and equity income by country: United States $ 358 $ 358 United Kingdom 119 164 Canada 43 35 Philippines and other 23 13 Total income before income tax expense and equity income by country $ 543 $ 570 As of March 31, December 31, 2016 2015 Total assets: PacifiCorp $ 23,590 $ 23,550 MidAmerican Funding 16,330 16,315 NV Energy 14,438 14,656 Northern Powergrid 7,272 7,317 BHE Pipeline Group 5,101 4,953 BHE Transmission 8,136 7,553 BHE Renewables 6,156 5,892 HomeServices 1,684 1,705 BHE and Other (1) 1,539 1,677 Total assets $ 84,246 $ 83,618 (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 three-month period ended March 31, 2016 (in millions): BHE BHE MidAmerican NV Northern Pipeline BHE BHE Home- and PacifiCorp Funding Energy Powergrid Group Transmission Renewables Services Other Total December 31, 2015 $ 1,129 $ 2,102 $ 2,369 $ 1,056 $ 101 $ 1,428 $ 95 $ 794 $ 2 $ 9,076 Acquisitions — — — — — — — 3 — 3 Foreign currency translation — — — (20 ) — 91 — — 1 72 Other — — — — (6 ) — — — — (6 ) March 31, 2016 $ 1,129 $ 2,102 $ 2,369 $ 1,036 $ 95 $ 1,519 $ 95 $ 797 $ 3 $ 9,145
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 previously reported nonregulated energy segment consisted substantially of MidAmerican Energy's unregulated retail services business, which was transferred to a subsidiary of BHE and is excluded from the information presented below. Refer to Note 3 for further discussion. 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 remaining nonregulated operations. The following tables provide information on a reportable segment basis (in millions): Three-Month Periods Ended March 31, 2016 2015 Operating revenue: Regulated electric $ 399 $ 426 Regulated gas 226 295 Other — 1 Total operating revenue $ 625 $ 722 Depreciation and amortization: Regulated electric $ 99 $ 90 Regulated gas 11 10 Total depreciation and amortization $ 110 $ 100 Operating income: Regulated electric $ 57 $ 53 Regulated gas 43 47 Total operating income $ 100 $ 100 As of March 31, December 31, Total assets: Regulated electric $ 13,015 $ 12,970 Regulated gas 1,199 1,251 Other (1) — 164 Total assets $ 14,214 $ 14,385 (1) Other total assets for December 31, 2015, includes amounts for MidAmerican Energy's unregulated retail services business transferred to a subsidiary of BHE.
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 previously reported nonregulated energy segment consisted substantially of MidAmerican Energy's unregulated retail services business, which was transferred to a subsidiary of BHE and is excluded from the information presented below. Refer to Note 3 for further discussion. 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 Ended March 31, 2016 2015 Operating revenue: Regulated electric $ 399 $ 426 Regulated gas 226 295 Other 1 6 Total operating revenue $ 626 $ 727 Depreciation and amortization: Regulated electric $ 99 $ 90 Regulated gas 11 10 Total depreciation and amortization $ 110 $ 100 Operating income: Regulated electric $ 57 $ 53 Regulated gas 43 47 Other — 1 Total operating income $ 100 $ 101 As of March 31, December 31, Total assets (1) : Regulated electric $ 14,206 $ 14,161 Regulated gas 1,278 1,330 Other 17 183 Total assets $ 15,501 $ 15,674 (1) Total assets by reportable segment reflect the assignment of goodwill to applicable reporting units. Other total assets for December 31, 2015, includes amounts for MidAmerican Energy's unregulated retail services business transferred to a subsidiary of BHE.
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 Ended March 31, 2016 2015 Operating revenue: Regulated electric $ 170 $ 196 Regulated gas 47 50 Total operating revenue $ 217 $ 246 Cost of sales: Regulated electric $ 70 $ 97 Regulated gas 30 35 Total cost of sales $ 100 $ 132 Gross margin: Regulated electric $ 100 $ 99 Regulated gas 17 15 Total gross margin $ 117 $ 114 Operating and maintenance: Regulated electric $ 36 $ 32 Regulated gas 5 4 Total operating and maintenance $ 41 $ 36 Depreciation and amortization: Regulated electric $ 25 $ 24 Regulated gas 4 4 Total depreciation and amortization $ 29 $ 28 Operating income: Regulated electric $ 33 $ 37 Regulated gas 8 6 Total operating income $ 41 $ 43 Interest expense: Regulated electric $ 14 $ 14 Regulated gas 2 1 Total interest expense $ 16 $ 15 As of March 31, December 31, 2016 2015 Total assets: Regulated electric $ 3,031 $ 3,060 Regulated gas 328 316 Regulated common assets (1) 141 111 Total assets $ 3,500 $ 3,487 (1) Consists principally of cash and cash equivalents not included in either the regulated electric or regulated natural gas segments.

Discontinued Operations

Discontinued Operations	3 Months Ended
	Mar. 31, 2016
MidAmerican Funding, LLC and Subsidiaries [Domain]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operations, Disclosure	( 3 ) Discontinued Operations Refer to Note 3 of MidAmerican Energy's Notes to Financial Statements. The transfer of MidAmerican Energy's unregulated retail services business to a subsidiary of BHE repaid a portion of MHC's note payable to BHE.
MidAmerican Energy Company [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operations, Disclosure	( 3 ) Discontinued Operations On January 1, 2016, MidAmerican Energy transferred the assets and liabilities of its unregulated retail services business to a subsidiary of BHE. The transfer was made at MidAmerican Energy’s carrying value of the assets and liabilities as of December 31, 2015, and was recorded by MidAmerican Energy as a noncash dividend as summarized in the table below. Financial results of the unregulated retail services business for the three-month period ended March 31, 2015 , have been reclassified to discontinued operations in the Statement of Operations. Operating revenue and cost of sales of the unregulated retail services business for the three-month period ended March 31, 2015 , totaled $224 million and $212 million , respectively. Cash flows from operating activities of the unregulated retail services business totaled $17 million for the three-month period ended March 31, 2015 , and are reflected in the Statement of Cash Flows. Assets, liabilities and equity of the unregulated retail services business reflected in the Balance Sheet as of December 31, 2015, are as follows (in millions): Receivables $ 115 Derivative assets 41 Deferred income taxes 21 Accounts payable (49 ) Derivative liabilities (42 ) Other assets and liabilities, net 4 Dividend, excluding accumulated other comprehensive loss, net 90 Accumulated other comprehensive loss, net 27 Dividend, including accumulated other comprehensive loss, net $ 117

Property, Plant and Equipment50

Property, Plant and Equipment, Net (Tables)	3 Months Ended
	Mar. 31, 2016
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 March 31, December 31, Life 2016 2015 Regulated assets: Utility generation, transmission and distribution systems 5-80 years $ 69,880 $ 69,248 Interstate natural gas pipeline assets 3-80 years 6,798 6,755 76,678 76,003 Accumulated depreciation and amortization (23,084 ) (22,682 ) Regulated assets, net 53,594 53,321 Nonregulated assets: Independent power plants 5-30 years 4,781 4,751 Other assets 3-30 years 884 875 5,665 5,626 Accumulated depreciation and amortization (864 ) (805 ) Nonregulated assets, net 4,801 4,821 Net operating assets 58,395 58,142 Construction work-in-progress 2,757 2,627 Property, plant and equipment, net $ 61,152 $ 60,769
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 March 31, December 31, Depreciable Life 2016 2015 Utility plant in service, net: Generation 20-70 years $ 10,499 $ 10,404 Transmission 52-70 years 1,304 1,305 Electric distribution 20-70 years 3,086 3,059 Gas distribution 28-70 years 1,519 1,507 Utility plant in service 16,408 16,275 Accumulated depreciation and amortization (5,312 ) (5,229 ) Utility plant in service, net 11,096 11,046 Nonregulated property, net: Nonregulated property gross 5-45 years 7 15 Accumulated depreciation and amortization (1 ) (5 ) Nonregulated property, net 6 10 11,102 11,056 Construction work in progress 657 667 Property, plant and equipment, net $ 11,759 $ 11,723
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 March 31, December 31, Depreciable Life 2016 2015 Property, plant and equipment in-service 5-75 years $ 26,822 $ 26,757 Accumulated depreciation and amortization (8,485 ) (8,360 ) Net property, plant and equipment in-service 18,337 18,397 Construction work-in-progress 699 629 Total property, plant and equipment, net $ 19,036 $ 19,026
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 March 31, December 31, 2016 2015 Utility plant: Generation 25 - 80 years $ 4,228 $ 4,212 Distribution 20 - 65 years 3,148 3,118 Transmission 45 - 65 years 1,796 1,788 General and intangible plant 5 - 65 years 721 694 Utility plant 9,893 9,812 Accumulated depreciation and amortization (3,034 ) (2,971 ) Utility plant, net 6,859 6,841 Other non-regulated, net of accumulated depreciation and amortization 5 - 65 years 2 2 Plant, net 6,861 6,843 Construction work-in-progress 135 153 Property, plant and equipment, net $ 6,996 $ 6,996
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 March 31, December 31, 2016 2015 Utility plant: Electric generation 40 - 125 years $ 1,128 $ 1,134 Electric distribution 20 - 70 years 1,393 1,382 Electric transmission 50 - 70 years 748 739 Electric general and intangible plant 5 - 65 years 156 139 Natural gas distribution 40 - 70 years 375 374 Natural gas general and intangible plant 8 - 10 years 15 13 Common general 5 - 65 years 264 265 Utility plant 4,079 4,046 Accumulated depreciation and amortization (1,382 ) (1,368 ) Utility plant, net 2,697 2,678 Construction work-in-progress 73 88 Property, plant and equipment, net $ 2,770 $ 2,766

Investments and Restricted Ca51

Investments and Restricted Cash and Investments (Tables)	3 Months Ended
	Mar. 31, 2016
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 March 31, December 31, 2016 2015 Investments: BYD Company Limited common stock $ 1,291 $ 1,238 Rabbi trusts 384 380 Other 150 130 Total investments 1,825 1,748 Equity method investments: Electric Transmission Texas, LLC 609 585 BHE Renewables tax equity investments 429 168 Bridger Coal Company 185 190 Other 170 160 Total equity method investments 1,393 1,103 Restricted cash and investments: Quad Cities Station nuclear decommissioning trust funds 436 429 Solar Star and Topaz Projects 26 95 Other 161 129 Total restricted cash and investments 623 653 Total investments and restricted cash and investments $ 3,841 $ 3,504 Reflected as: Current assets $ 122 $ 137 Noncurrent assets 3,719 3,367 Total investments and restricted cash and investments $ 3,841 $ 3,504

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2016
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 Ended March 31, 2016 2015 Federal statutory income tax rate 35 % 35 % Income tax credits (14 ) (11 ) State income tax, net of federal income tax benefit (4 ) 2 Income tax effect of foreign income (5 ) (4 ) Equity income 2 2 Other, net — (2 ) Effective income tax rate 14 % 22 %
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 from continuing operations is as follows: Three-Month Periods Ended March 31, 2016 2015 Federal statutory income tax rate 35 % 35 % Income tax credits (57 ) (63 ) State income tax, net of federal income tax benefit 5 4 Effects of ratemaking (12 ) (11 ) Other, net — (1 ) Effective income tax rate (29 )% (36 )%
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 from continuing operations is as follows: Three-Month Periods Ended March 31, 2016 2015 Federal statutory income tax rate 35 % 35 % Income tax credits (62 ) (55 ) State income tax, net of federal income tax benefit 5 3 Effects of ratemaking (14 ) (10 ) Other, net 1 (1 ) Effective income tax rate (35 )% (28 )%

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2016
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 Ended March 31, 2016 2015 Service cost $ 5 $ 6 Interest cost 19 20 Expected return on plan assets (29 ) (29 ) Net amortization 12 16 Net periodic benefit cost $ 7 $ 13 Domestic Operations Net periodic benefit cost for the domestic pension and other postretirement benefit plans included the following components (in millions): Three-Month Periods Ended March 31, 2016 2015 Pension: Service cost $ 8 $ 8 Interest cost 31 30 Expected return on plan assets (40 ) (42 ) Net amortization 11 13 Net periodic benefit cost $ 10 $ 9 Other postretirement: Service cost $ 3 $ 4 Interest cost 8 7 Expected return on plan assets (11 ) (12 ) Net amortization (3 ) (3 ) Net periodic benefit credit $ (3 ) $ (4 )
PacifiCorp [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Defined Benefit Plans Disclosures	Net periodic benefit cost for the pension and other postretirement benefit plans included the following components (in millions): Three-Month Periods Ended March 31, 2016 2015 Pension: Service cost $ 1 $ 1 Interest cost 14 13 Expected return on plan assets (19 ) (19 ) Net amortization 8 10 Net periodic benefit cost $ 4 $ 5 Other postretirement: Service cost $ 1 $ 1 Interest cost 4 4 Expected return on plan assets (6 ) (6 ) Net amortization (1 ) (1 ) Net periodic benefit credit $ (2 ) $ (2 )
MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Defined Benefit Plans Disclosures	Net periodic benefit cost (credit) for the plans of MidAmerican Energy and the aforementioned affiliates included the following components (in millions): Three-Month Periods Ended March 31, 2016 2015 Pension: Service cost $ 3 $ 3 Interest cost 8 8 Expected return on plan assets (11 ) (11 ) Net periodic benefit cost $ — $ — Other postretirement: Service cost $ 1 $ 2 Interest cost 2 2 Expected return on plan assets (3 ) (4 ) Net amortization (1 ) (1 ) Net periodic benefit credit $ (1 ) $ (1 )
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 March 31, December 31, 2016 2015 Qualified Pension Plan - Other long-term liabilities $ (40 ) $ (38 ) Non-Qualified Pension Plans: Other current liabilities (1 ) (1 ) Other long-term liabilities (9 ) (9 ) Other Postretirement Plans - Other long-term liabilities (5 ) (5 )
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 March 31, December 31, 2016 2015 Qualified Pension Plan - Other long-term liabilities $ (29 ) $ (29 ) Non-Qualified Pension Plans: Other current liabilities (1 ) (1 ) Other long-term liabilities (9 ) (9 ) Other Postretirement Plans - Other long-term liabilities (32 ) (32 )

Risk Management and Hedging A54

Risk Management and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 Not designated as hedging contracts: Commodity assets (1) $ 20 $ 85 $ 11 $ 2 $ 118 Commodity liabilities (1) (1 ) — (117 ) (174 ) (292 ) Interest rate assets 11 — — — 11 Interest rate liabilities — — (5 ) (12 ) (17 ) Total 30 85 (111 ) (184 ) (180 ) Designated as hedging contracts: Commodity assets — — — — — Commodity liabilities — — (47 ) (26 ) (73 ) Interest rate assets — — — — — Interest rate liabilities — — (4 ) (7 ) (11 ) Total — — (51 ) (33 ) (84 ) Total derivatives 30 85 (162 ) (217 ) (264 ) Cash collateral receivable — — 47 66 113 Total derivatives - net basis $ 30 $ 85 $ (115 ) $ (151 ) $ (151 ) Other Other Other Current Other Current Long-term Assets Assets Liabilities Liabilities Total As of December 31, 2015 Not designated as hedging contracts: Commodity assets (1) $ 25 $ 72 $ 7 $ 2 $ 106 Commodity liabilities (1) (4 ) — (113 ) (175 ) (292 ) Interest rate assets 7 — — — 7 Interest rate liabilities — — (3 ) (6 ) (9 ) Total 28 72 (109 ) (179 ) (188 ) Designated as hedging contracts: Commodity assets — — 1 2 3 Commodity liabilities — — (33 ) (17 ) (50 ) Interest rate assets — 3 — — 3 Interest rate liabilities — — (4 ) (1 ) (5 ) Total — 3 (36 ) (16 ) (49 ) Total derivatives 28 75 (145 ) (195 ) (237 ) Cash collateral receivable — — 40 63 103 Total derivatives - net basis $ 28 $ 75 $ (105 ) $ (132 ) $ (134 ) (1) The Company's commodity derivatives not designated as hedging contracts are generally included in regulated rates, and as of March 31, 2016 and December 31, 2015 , a net regulatory asset of $253 million and $250 million , respectively, was recorded related to the net derivative liability of $174 million and $186 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 Ended March 31, 2016 2015 Beginning balance $ 250 $ 223 Changes in fair value recognized in net regulatory assets 36 60 Net gains reclassified to operating revenue — 9 Net losses reclassified to cost of sales (33 ) (37 ) Ending balance $ 253 $ 255
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 other comprehensive income ("OCI"), as well as amounts reclassified to earnings (in millions): Three-Month Periods Ended March 31, 2016 2015 Beginning balance $ 46 $ 32 Changes in fair value recognized in OCI 48 (8 ) Net gains reclassified to operating revenue — 1 Net (losses) gains reclassified to cost of sales (22 ) 2 Ending balance $ 72 $ 27
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 March 31, December 31, Measure 2016 2015 Electricity purchases Megawatt hours 11 10 Natural gas purchases Decatherms 360 317 Fuel purchases Gallons 9 11 Interest rate swaps US$ 653 653 Mortgage sale commitments, net US$ (213 ) (312 )
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 March 31, 2016 Not designated as hedging contracts (1) : Commodity assets $ 5 $ — $ 2 $ — $ 7 Commodity liabilities (1 ) — (65 ) (89 ) (155 ) Total 4 — (63 ) (89 ) (148 ) Total derivatives 4 — (63 ) (89 ) (148 ) Cash collateral receivable — — 19 59 78 Total derivatives - net basis $ 4 $ — $ (44 ) $ (30 ) $ (70 ) As of December 31, 2015 Not designated as hedging contracts (1) : Commodity assets $ 10 $ — $ 2 $ — $ 12 Commodity liabilities (1 ) — (58 ) (89 ) (148 ) Total 9 — (56 ) (89 ) (136 ) Total derivatives 9 — (56 ) (89 ) (136 ) Cash collateral receivable — — 18 57 75 Total derivatives - net basis $ 9 $ — $ (38 ) $ (32 ) $ (61 )
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 Ended March 31, 2016 2015 Beginning balance $ 133 $ 85 Changes in fair value recognized in net regulatory assets 26 48 Net gains reclassified to operating revenue 8 25 Net losses reclassified to energy costs (23 ) (28 ) Ending balance $ 144 $ 130
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 March 31, December 31, Measure 2016 2015 Electricity purchases Megawatt hours 2 1 Natural gas purchases Decatherms 107 111 Fuel oil purchases Gallons 9 11
MidAmerican Energy Company [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 MidAmerican Energy's derivative contracts, on a gross basis, and reconciles those amounts to the amounts presented on a net basis on the Balance Sheets (in millions): Other Current Assets Other Assets Other Current Liabilities Other Long-term Liabilities Total As of March 31, 2016: Not designated as hedging contracts (1)(2) : Commodity assets $ 3 $ — $ 1 $ — $ 4 Commodity liabilities — — (11 ) (1 ) (12 ) Total 3 — (10 ) (1 ) (8 ) Designated as hedging contracts (2) : Commodity assets — — — — — Commodity liabilities — — — — — Total — — — — — Total derivatives 3 — (10 ) (1 ) (8 ) Cash collateral receivable — — 6 — 6 Total derivatives - net basis $ 3 $ — $ (4 ) $ (1 ) $ (2 ) As of December 31, 2015: Not designated as hedging contracts (1) : Commodity assets $ 12 $ 4 $ 5 $ 2 $ 23 Commodity liabilities (3 ) — (36 ) (10 ) (49 ) Total 9 4 (31 ) (8 ) (26 ) Designated as hedging contracts: Commodity assets — — 1 2 3 Commodity liabilities — — (32 ) (17 ) (49 ) Total — — (31 ) (15 ) (46 ) Total derivatives 9 4 (62 ) (23 ) (72 ) Cash collateral receivable — — 22 6 28 Total derivatives - net basis $ 9 $ 4 $ (40 ) $ (17 ) $ (44 ) (1) MidAmerican Energy's commodity derivatives not designated as hedging contracts are generally included in regulated rates, and as of March 31, 2016 and December 31, 2015 , a net regulatory asset of $11 million and $20 million , respectively, was recorded related to the net derivative liability of $8 million and $26 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 MidAmerican Energy'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 Ended March 31, 2016 2015 Beginning balance $ 20 $ 38 Changes in fair value recognized in net regulatory assets 6 2 Net losses reclassified to operating revenue (8 ) (16 ) Net losses reclassified to cost of gas sold (7 ) (6 ) Ending balance $ 11 $ 18
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)	The following table reconciles the beginning and ending balances of MidAmerican Energy's accumulated other comprehensive loss (pre-tax) and summarizes pre-tax gains and losses on commodity derivative contracts designated and qualifying as cash flow hedges recognized in other comprehensive income ("OCI"), as well as amounts reclassified to earnings (in millions): Three-Month Periods Ended March 31, 2016 2015 Beginning balance $ 45 $ 34 Transfer to affiliate (45 ) — Changes in fair value recognized in OCI — (6 ) Net gains reclassified to nonregulated cost of sales — 2 Ending balance $ — $ 30
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 March 31, December 31, Measure 2016 2015 Electricity purchases Megawatt hours — 15 Natural gas purchases Decatherms 12 17
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 March 31, 2016 Commodity liabilities (1) $ (9 ) $ (13 ) $ (22 ) As of December 31, 2015 Commodity liabilities (1) $ (8 ) $ (14 ) $ (22 ) (1) Nevada Power's commodity derivatives not designated as hedging contracts are included in regulated rates and as of March 31, 2016 and December 31, 2015 , a regulatory asset of $22 million was recorded related to the derivative liability of $22 million .
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 as of (in millions): Unit of March 31, December 31, Measure 2016 2015 Electricity sales Megawatt hours (2 ) (2 ) Natural gas purchases Decatherms 169 126

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2016
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 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 March 31, 2016 Assets: Commodity derivatives $ — $ 17 $ 101 $ (14 ) $ 104 Interest rate derivatives — — 11 — 11 Mortgage loans held for sale — 237 — — 237 Money market mutual funds (2) 504 — — — 504 Debt securities: United States government obligations 142 — — — 142 International government obligations — 2 — — 2 Corporate obligations — 34 — — 34 Municipal obligations — 2 — — 2 Agency, asset and mortgage-backed obligations — 4 — — 4 Auction rate securities — — 26 — 26 Equity securities: United States companies 242 — — — 242 International companies 1,298 — — — 1,298 Investment funds 161 — — — 161 $ 2,347 $ 296 $ 138 $ (14 ) $ 2,767 Liabilities: Commodity derivatives $ (10 ) $ (312 ) $ (43 ) $ 127 $ (238 ) Interest rate derivatives — (28 ) — — (28 ) $ (10 ) $ (340 ) $ (43 ) $ 127 $ (266 ) As of December 31, 2015 Assets: Commodity derivatives $ — $ 16 $ 93 $ (16 ) $ 93 Interest rate derivatives — 5 5 — 10 Mortgage loans held for sale — 327 — — 327 Money market mutual funds (2) 421 — — — 421 Debt securities: United States government obligations 133 — — — 133 International government obligations — 2 — — 2 Corporate obligations — 39 — — 39 Municipal obligations — 1 — — 1 Agency, asset and mortgage-backed obligations — 3 — — 3 Auction rate securities — — 44 — 44 Equity securities: United States companies 239 — — — 239 International companies 1,244 — — — 1,244 Investment funds 136 — — — 136 $ 2,173 $ 393 $ 142 $ (16 ) $ 2,692 Liabilities: Commodity derivatives $ (13 ) $ (283 ) $ (46 ) $ 119 $ (223 ) Interest rate derivatives — (13 ) (1 ) — (14 ) $ (13 ) $ (296 ) $ (47 ) $ 119 $ (237 ) (1) Represents netting under master netting arrangements and a net cash collateral receivable of $113 million and $103 million as of March 31, 2016 and December 31, 2015 , 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 Ended March 31, Interest Auction Commodity Rate Rate Derivatives Derivatives Securities 2016: Beginning balance $ 47 $ 4 $ 44 Changes included in earnings 19 25 — Changes in fair value recognized in OCI (6 ) — 4 Changes in fair value recognized in net regulatory assets (6 ) — — Redemptions — — (22 ) Settlements 4 (18 ) — Ending balance $ 58 $ 11 $ 26 Three-Month Periods Ended March 31, Interest Auction Commodity Rate Rate Derivatives Derivatives Securities 2015: Beginning balance $ 51 $ — $ 45 Changes included in earnings 8 21 — Changes in fair value recognized in OCI 1 — (1 ) Changes in fair value recognized in net regulatory assets (3 ) — — Settlements (8 ) (16 ) — Transfers from Level 2 — 3 — Ending balance $ 49 $ 8 $ 44
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 March 31, 2016 As of December 31, 2015 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 37,313 $ 42,878 $ 37,972 $ 41,785
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 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 March 31, 2016 Assets: Commodity derivatives $ — $ 6 $ 1 $ (3 ) $ 4 Money market mutual funds (2) 178 — — — 178 Investment funds 15 — — — 15 $ 193 $ 6 $ 1 $ (3 ) $ 197 Liabilities - Commodity derivatives $ — $ (155 ) $ — $ 81 $ (74 ) As of December 31, 2015 Assets: Commodity derivatives $ — $ 9 $ 3 $ (3 ) $ 9 Money market mutual funds (2) 13 — — — 13 Investment funds 15 — — — 15 $ 28 $ 9 $ 3 $ (3 ) $ 37 Liabilities - Commodity derivatives $ — $ (148 ) $ — $ 78 $ (70 )
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 March 31, 2016 As of December 31, 2015 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 7,061 $ 8,437 $ 7,114 $ 8,210
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 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 March 31, 2016: Assets: Commodity derivatives $ — $ 3 $ 1 $ (1 ) $ 3 Money market mutual funds (2) 4 — — — 4 Debt securities: United States government obligations 142 — — — 142 International government obligations — 2 — — 2 Corporate obligations — 34 — — 34 Municipal obligations — 2 — — 2 Agency, asset and mortgage-backed obligations — 4 — — 4 Auction rate securities — — 26 — 26 Equity securities: United States companies 242 — — — 242 International companies 7 — — — 7 Investment funds 9 — — — 9 $ 404 $ 45 $ 27 $ (1 ) $ 475 Liabilities - commodity derivatives $ (3 ) $ (4 ) $ (5 ) $ 7 $ (5 ) As of December 31, 2015: Assets: Commodity derivatives $ — $ 8 $ 18 $ (13 ) $ 13 Money market mutual funds (2) 56 — — — 56 Debt securities: United States government obligations 133 — — — 133 International government obligations — 2 — — 2 Corporate obligations — 39 — — 39 Municipal obligations — 1 — — 1 Agency, asset and mortgage-backed obligations — 3 — — 3 Auction rate securities — — 26 — 26 Equity securities: United States companies 239 — — — 239 International companies 6 — — — 6 Investment funds 4 — — — 4 $ 438 $ 53 $ 44 $ (13 ) $ 522 Liabilities - commodity derivatives $ (13 ) $ (61 ) $ (24 ) $ 41 $ (57 ) (1) Represents netting under master netting arrangements and a net cash collateral receivable of $6 million and $28 million as of March 31, 2016 and December 31, 2015 , 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 Ended March 31, Commodity Derivatives Auction Rate Securities 2016: Beginning balance $ (6 ) $ 26 Transfer to affiliate (4 ) — Changes in fair value recognized in OCI — 1 Changes in fair value recognized in net regulatory assets (1 ) — Sales — (1 ) Settlements 7 — Ending balance $ (4 ) $ 26 2015: Beginning balance $ 12 $ 26 Changes included in earnings 2 — Changes in fair value recognized in OCI 1 — Settlements (6 ) — Ending balance $ 9 $ 26
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 March 31, 2016 As of December 31, 2015 Carrying Value Fair Value Carrying Value Fair Value Long-term debt $ 4,268 $ 4,847 $ 4,271 $ 4,636
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 March 31, 2016 As of December 31, 2015 Carrying Value Fair Value Carrying Value Fair Value Long-term debt $ 4,594 $ 5,280 $ 4,597 $ 5,051
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 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 March 31, 2016 Assets - investment funds $ 5 $ — $ — $ 5 Liabilities - commodity derivatives $ — $ — $ (22 ) $ (22 ) As of December 31, 2015 Assets - investment funds $ 5 $ — $ — $ 5 Liabilities - commodity derivatives $ — $ — $ (22 ) $ (22 )
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 Ended March 31, 2016 2015 Beginning balance $ (22 ) $ (30 ) Changes in fair value recognized in regulatory assets (3 ) (4 ) Settlements 3 2 Ending balance $ (22 ) $ (32 )
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 March 31, 2016 As of December 31, 2015 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 2,579 $ 3,141 $ 2,788 $ 3,240
Sierra Pacific Power Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
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 March 31, 2016 As of December 31, 2015 Carrying Fair Carrying Fair Value Value Value Value Long-term debt $ 1,166 $ 1,278 $ 1,165 $ 1,248

Components of Accumulated Oth56

Components of Accumulated Other Comprehensive Loss, Net (Tables)	3 Months Ended
	Mar. 31, 2016
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, 2014 $ (490 ) $ (412 ) $ 390 $ 18 $ (494 ) Other comprehensive income (loss) 22 (424 ) 166 1 (235 ) Balance, March 31, 2015 $ (468 ) $ (836 ) $ 556 $ 19 $ (729 ) Balance, December 31, 2015 $ (438 ) $ (1,092 ) $ 615 $ 7 $ (908 ) Other comprehensive income (loss) 22 67 33 (23 ) 99 Balance, March 31, 2016 $ (416 ) $ (1,025 ) $ 648 $ (16 ) $ (809 )
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 ("AOCI") 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, 2014 $ (3 ) $ (20 ) $ (23 ) Other comprehensive income — 2 2 Balance at March 31, 2015 $ (3 ) $ (18 ) $ (21 ) Balance, December 31, 2015 $ (3 ) $ (27 ) $ (30 ) Other comprehensive income 1 — 1 Dividend (Note 3) — 27 27 Balance, March 31, 2016 $ (2 ) $ — $ (2 )

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2016
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. Effective January 1, 2016, MidAmerican Energy transferred the assets and liabilities of its unregulated retail services business to a subsidiary of BHE . Prior period amounts have been changed to reflect this activity in BHE and Other . Information related to the Company's reportable segments is shown below (in millions): Three-Month Periods Ended March 31, 2016 2015 Operating revenue: PacifiCorp $ 1,252 $ 1,250 MidAmerican Funding 626 727 NV Energy 615 706 Northern Powergrid 279 324 BHE Pipeline Group 315 332 BHE Transmission 158 125 BHE Renewables 139 124 HomeServices 491 448 BHE and Other (1) 166 185 Total operating revenue $ 4,041 $ 4,221 Depreciation and amortization: PacifiCorp $ 197 $ 194 MidAmerican Funding 110 100 NV Energy 104 101 Northern Powergrid 50 48 BHE Pipeline Group 53 50 BHE Transmission 50 38 BHE Renewables 56 49 HomeServices 6 6 BHE and Other (1) — 1 Total depreciation and amortization $ 626 $ 587 Three-Month Periods Ended March 31, 2016 2015 Operating income: PacifiCorp $ 324 $ 273 MidAmerican Funding 100 101 NV Energy 89 121 Northern Powergrid 158 193 BHE Pipeline Group 192 200 BHE Transmission 76 46 BHE Renewables 24 6 HomeServices (1 ) (2 ) BHE and Other (1) (9 ) (8 ) Total operating income 953 930 Interest expense (473 ) (472 ) Capitalized interest 11 29 Allowance for equity funds 15 31 Interest and dividend income 27 26 Other, net 10 26 Total income before income tax expense and equity income $ 543 $ 570 Interest expense: PacifiCorp $ 95 $ 95 MidAmerican Funding 54 50 NV Energy 67 63 Northern Powergrid 36 35 BHE Pipeline Group 13 18 BHE Transmission 36 36 BHE Renewables 49 46 HomeServices 1 1 BHE and Other (1) 122 128 Total interest expense $ 473 $ 472 Operating revenue by country: United States $ 3,599 $ 3,769 United Kingdom 279 324 Canada 160 127 Philippines and other 3 1 Total operating revenue by country $ 4,041 $ 4,221 Income before income tax expense and equity income by country: United States $ 358 $ 358 United Kingdom 119 164 Canada 43 35 Philippines and other 23 13 Total income before income tax expense and equity income by country $ 543 $ 570 As of March 31, December 31, 2016 2015 Total assets: PacifiCorp $ 23,590 $ 23,550 MidAmerican Funding 16,330 16,315 NV Energy 14,438 14,656 Northern Powergrid 7,272 7,317 BHE Pipeline Group 5,101 4,953 BHE Transmission 8,136 7,553 BHE Renewables 6,156 5,892 HomeServices 1,684 1,705 BHE and Other (1) 1,539 1,677 Total assets $ 84,246 $ 83,618 (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.
Schedule of Goodwill	The following table shows the change in the carrying amount of goodwill by reportable segment for the three-month period ended March 31, 2016 (in millions): BHE BHE MidAmerican NV Northern Pipeline BHE BHE Home- and PacifiCorp Funding Energy Powergrid Group Transmission Renewables Services Other Total December 31, 2015 $ 1,129 $ 2,102 $ 2,369 $ 1,056 $ 101 $ 1,428 $ 95 $ 794 $ 2 $ 9,076 Acquisitions — — — — — — — 3 — 3 Foreign currency translation — — — (20 ) — 91 — — 1 72 Other — — — — (6 ) — — — — (6 ) March 31, 2016 $ 1,129 $ 2,102 $ 2,369 $ 1,036 $ 95 $ 1,519 $ 95 $ 797 $ 3 $ 9,145
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 Ended March 31, 2016 2015 Operating revenue: Regulated electric $ 399 $ 426 Regulated gas 226 295 Other — 1 Total operating revenue $ 625 $ 722 Depreciation and amortization: Regulated electric $ 99 $ 90 Regulated gas 11 10 Total depreciation and amortization $ 110 $ 100 Operating income: Regulated electric $ 57 $ 53 Regulated gas 43 47 Total operating income $ 100 $ 100 As of March 31, December 31, Total assets: Regulated electric $ 13,015 $ 12,970 Regulated gas 1,199 1,251 Other (1) — 164 Total assets $ 14,214 $ 14,385 (1) Other total assets for December 31, 2015, includes amounts for MidAmerican Energy's unregulated retail services business transferred to a subsidiary of BHE.
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 Ended March 31, 2016 2015 Operating revenue: Regulated electric $ 399 $ 426 Regulated gas 226 295 Other 1 6 Total operating revenue $ 626 $ 727 Depreciation and amortization: Regulated electric $ 99 $ 90 Regulated gas 11 10 Total depreciation and amortization $ 110 $ 100 Operating income: Regulated electric $ 57 $ 53 Regulated gas 43 47 Other — 1 Total operating income $ 100 $ 101 As of March 31, December 31, Total assets (1) : Regulated electric $ 14,206 $ 14,161 Regulated gas 1,278 1,330 Other 17 183 Total assets $ 15,501 $ 15,674 (1) Total assets by reportable segment reflect the assignment of goodwill to applicable reporting units. Other total assets for December 31, 2015, includes amounts for MidAmerican Energy's unregulated retail services business transferred to a subsidiary of BHE.
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 Ended March 31, 2016 2015 Operating revenue: Regulated electric $ 170 $ 196 Regulated gas 47 50 Total operating revenue $ 217 $ 246 Cost of sales: Regulated electric $ 70 $ 97 Regulated gas 30 35 Total cost of sales $ 100 $ 132 Gross margin: Regulated electric $ 100 $ 99 Regulated gas 17 15 Total gross margin $ 117 $ 114 Operating and maintenance: Regulated electric $ 36 $ 32 Regulated gas 5 4 Total operating and maintenance $ 41 $ 36 Depreciation and amortization: Regulated electric $ 25 $ 24 Regulated gas 4 4 Total depreciation and amortization $ 29 $ 28 Operating income: Regulated electric $ 33 $ 37 Regulated gas 8 6 Total operating income $ 41 $ 43 Interest expense: Regulated electric $ 14 $ 14 Regulated gas 2 1 Total interest expense $ 16 $ 15 As of March 31, December 31, 2016 2015 Total assets: Regulated electric $ 3,031 $ 3,060 Regulated gas 328 316 Regulated common assets (1) 141 111 Total assets $ 3,500 $ 3,487 (1) Consists principally of cash and cash equivalents not included in either the regulated electric or regulated natural gas segments.

Discontinued Operations (Tables

Discontinued Operations (Tables)	3 Months Ended
	Mar. 31, 2016
MidAmerican Energy Company [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Groups, Including Discontinued Operations [Table Text Block]	Assets, liabilities and equity of the unregulated retail services business reflected in the Balance Sheet as of December 31, 2015, are as follows (in millions): Receivables $ 115 Derivative assets 41 Deferred income taxes 21 Accounts payable (49 ) Derivative liabilities (42 ) Other assets and liabilities, net 4 Dividend, excluding accumulated other comprehensive loss, net 90 Accumulated other comprehensive loss, net 27 Dividend, including accumulated other comprehensive loss, net $ 117

General (Details)

General (Details)	3 Months Ended
	Mar. 31, 2016OperatingSegmentsOwnedAndOperatedCompanies
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

Property, Plant and Equipment60

Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment in service, net	$ 58,395	$ 58,142
Construction work-in-progress	2,757	2,627
Property, plant and equipment, net	61,152	60,769
Regulated assets [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	76,678	76,003
Accumulated depreciation and amortization	(23,084)	(22,682)
Property, plant and equipment in service, net	53,594	53,321
Construction work-in-progress	2,300	2,300
Regulated assets [Member] | Utility generation, transmission and distribution systems
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 69,880	69,248
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	$ 6,798	6,755
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 operation [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 5,665	5,626
Accumulated depreciation and amortization	(864)	(805)
Property, plant and equipment in service, net	4,801	4,821
Unregulated operation [Member] | Independent power plants
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 4,781	4,751
Unregulated operation [Member] | Independent power plants | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	5 years
Unregulated operation [Member] | Independent power plants | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	30 years
Unregulated operation [Member] | Other assets
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 884	$ 875
Unregulated operation [Member] | Other assets | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	3 years
Unregulated operation [Member] | Other assets | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	30 years

Property, Plant and Equipment61

Property, Plant and Equipment, Net - PacifiCorp (Details) - PacifiCorp [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Electric Property Plant And Equipment In Service Gross	$ 26,822	$ 26,757
Public utility accumulated depreciation and amortization	(8,485)	(8,360)
Public Utilities Property, Plant And Equipment In Service, Net	18,337	18,397
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	699	629
Public Utilities, Property, Plant and Equipment, Net	$ 19,036	$ 19,026
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 Equipment62

Property, Plant and Equipment, Net Property, Plant and Equipment, Net - MEC (Details) - MidAmerican Energy Company [Member] - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 11,102	$ 11,056
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	657	667
Public Utilities, Property, Plant and Equipment, Net	11,759	11,723
Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Plant in Service, Excluding Construction Work In Progress	16,408	16,275
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(5,312)	(5,229)
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	11,096	11,046
Unregulated operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(1)	(5)
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	6	10
Gross public utility property, plant and equipment in service	7	15
Electric Operations [Member] | Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation or Processing	10,499	10,404
Public Utilities, Property, Plant and Equipment, Transmission	1,304	1,305
Public Utilities, Property, Plant and Equipment, Distribution	3,086	3,059
Natural Gas Processing Plant [Member] | Regulated Operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution	$ 1,519	$ 1,507

Property, Plant and Equipment63

Property, Plant and Equipment, Net Property, Plant and Equipment, Net - MidAmerican Funding (Details) - MidAmerican Funding, LLC and Subsidiaries [Domain] - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 22	$ 22
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ (8)	$ (8)

Property, Plant and Equipment64

Property, Plant and Equipment, Net Property, Plant and Equipment, Net - NPC(Details) - Nevada Power Company [Member] - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 6,861	$ 6,843
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	135	153
Public Utilities, Property, Plant and Equipment, Net	6,996	6,996
Regulated assets [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation or Processing	4,228	4,212
Public Utilities, Property, Plant and Equipment, Distribution	3,148	3,118
Public Utilities, Property, Plant and Equipment, Transmission	1,796	1,788
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	721	694
Public Utilities, Property, Plant and Equipment, Plant in Service, Excluding Construction Work In Progress	9,893	9,812
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	3,034	2,971
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	6,859	6,841
Unregulated operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	$ 2	$ 2
Minimum [Member] | Regulated assets [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	45 years	45 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	5 years	5 years
Minimum [Member] | Unregulated operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	5 years	5 years
Maximum [Member] | Regulated assets [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	80 years	80 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
Maximum [Member] | Unregulated operation [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	65 years	65 years

Property, Plant and Equipment65

Property, Plant and Equipment, Net Property, Plant and Equipment, Net - SPPC (Details) - Sierra Pacific Power Company [Member] - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Net	$ 2,770	$ 2,766
Electricity Generation Plant, Non-Nuclear [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation or Processing	1,128	1,134
Public Utilities, Property, Plant and Equipment, Distribution	1,393	1,382
Public Utilities, Property, Plant and Equipment, Transmission	748	739
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	156	139
Natural Gas Processing Plant [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution	375	374
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment	15	13
Common Facilities [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Common	264	265
Public Utilities, Property, Plant and Equipment, Plant in Service, Excluding Construction Work In Progress	4,079	4,046
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	1,382	1,368
Public Utilities, Property, Plant and Equipment, Net, Excluding Construction Work In Progress	2,697	2,678
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	73	88
Public Utilities, Property, Plant and Equipment, Net	$ 2,770	$ 2,766
Minimum [Member] | Electricity Generation Plant, Non-Nuclear [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	40 years	40 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
Minimum [Member] | Natural Gas Processing Plant [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	40 years	40 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	8 years	8 years
Minimum [Member] | Common Facilities [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Common, Useful Life	5 years	5 years
Maximum [Member] | Electricity Generation Plant, Non-Nuclear [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Generation, Useful Life	125 years	125 years
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life	70 years	70 years
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life	70 years	70 years
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life	65 years	65 years
Maximum [Member] | Natural Gas Processing Plant [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	10 years	10 years
Maximum [Member] | Common Facilities [Member]
Property, Plant and Equipment [Line Items]
Public Utilities, Property, Plant and Equipment, Common, Useful Life	65 years	65 years

Investments and Restricted Ca66

Investments and Restricted Cash and Investments (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Investments [Abstract]
Investments	$ 1,825	$ 1,748
Equity Method Investments [Abstract]
Equity method investments	1,393	1,103
Restricted Cash and Investments [Abstract]
Restricted cash and investments	623	653
Investments, including equity method investments and restricted cash and investments	3,841	3,504
Investments, including equity method investments and restricted cash and investments, current	122	137
Investments, including equity method investments and restricted cash and investments, noncurrent	3,719	3,367
Quad Cities Station nuclear decommissioning trust funds [Member]
Restricted Cash and Investments [Abstract]
Decommissioning fund investments, fair value	436	429
Solar Star and Topaz Projects [Member]
Restricted Cash and Investments [Abstract]
Restricted cash and investments	26	95
Other restricted cash and investments [Member]
Restricted Cash and Investments [Abstract]
Restricted cash and investments	161	129
ETT [Member]
Equity Method Investments [Abstract]
Equity method investments	609	585
Tax equity investments [Member]
Equity Method Investments [Abstract]
Equity method investments	429	168
Bridger Coal Company [Member]
Equity Method Investments [Abstract]
Equity method investments	185	190
Other equity method investments [Member]
Equity Method Investments [Abstract]
Equity method investments	170	160
BYD Company Limited common stock [Member]
Investments [Abstract]
Available-for-sale securities, equity securities	1,291	1,238
Available-for-sale securities, gross unrealized gain (loss)	1,100	1,000
Rabbi trusts [Member]
Investments [Abstract]
Rabbi trusts, amount	384	380
Other investments [Member]
Investments [Abstract]
Other investments	$ 150	$ 130

Recent Financing Transactions R

Recent Financing Transactions Recent Financing Transactions - Long-Term Debt (Details) - USD ($) $ in Millions	Apr. 30, 2016	Mar. 31, 2016
Berkshire Hathaway Energy [Member] | BHE Junior Subordinated Debentures [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount		$ 500
Sierra Pacific Power Company [Member] | Subsequent Event [Member] | Sierra Pacific Power Company [Member] | Mortgage securities, 2.600%, Series U due 2026 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 400
Debt instrument, interest rate, stated percentage	2.60%
Sierra Pacific Power Company [Member] | Subsequent Event [Member] | Sierra Pacific Power Company [Member] | Mortgage securities, 6.000%, Series M due 2016 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 450
Debt instrument, interest rate, stated percentage	6.00%

Recent Financing Transactions68

Recent Financing Transactions Recent Financings Transactions - Credit Facilities (Details) - Solar Star Funding, LLC [Member] - Letter of credit and reimbursement facility, Solar Star [Member] - Letter of Credit [Member] $ in Millions	Mar. 31, 2016USD ($)
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity replaced	$ 320
Line of Credit Facility, Maximum Borrowing Capacity	301
Letters of Credit Outstanding, Amount	$ 284

Recent Financing Transactions69

Recent Financing Transactions Recent Financing Transactions - SPPC (Details) - Sierra Pacific Power Company [Member] - Subsequent Event [Member] $ in Millions	Apr. 30, 2016USD ($)
Pollution Control Revenue Bonds, Variable-Rate, Series 2006A due 2031 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 58
Pollution Control Revenue Bonds, Variable-Rate, Series 2006B due 2036 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	75
Sierra Pacific Power Company [Member] | Mortgage securities, 2.600%, Series U due 2026 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 400
Debt instrument, interest rate, stated percentage	2.60%
Sierra Pacific Power Company [Member] | Mortgage securities, 6.000%, Series M due 2016 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 450
Debt instrument, interest rate, stated percentage	6.00%

Income Taxes (Details)

Income Taxes (Details)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	35.00%	35.00%
Income tax credits	(14.00%)	(11.00%)
State income tax, net of federal income tax benefit	(4.00%)	2.00%
Income tax effect of foreign income	(5.00%)	(4.00%)
Equity income	2.00%	2.00%
Other, net	(0.00%)	(2.00%)
Effective income tax rate	14.00%	22.00%
Production Tax Credit Carryforwards [Abstract]
Years eligible for federal renewable energy production tax credit	10 years

Income Taxes - MEC (Details)

Income Taxes - MEC (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	14.00%	11.00%
State income tax, net of federal income tax benefit	(4.00%)	2.00%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	0.00%	2.00%
Effective income tax rate	14.00%	22.00%
Production Tax Credit Carryforwards [Abstract]
Years eligible for federal renewable energy production tax credit	10 years
MidAmerican Energy Company [Member]
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	57.00%	63.00%
State income tax, net of federal income tax benefit	5.00%	4.00%
Effective Income Tax Rate Reconciliation Regulatory Differences	12.00%	11.00%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	0.00%	1.00%
Effective income tax rate	(29.00%)	(36.00%)
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	$ 4	$ 0

Income Taxes - MidAmerican Fund

Income Taxes - MidAmerican Funding (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	14.00%	11.00%
State income tax, net of federal income tax benefit	(4.00%)	2.00%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	0.00%	2.00%
Effective income tax rate	14.00%	22.00%
Production Tax Credit Carryforwards [Abstract]
Years eligible for federal renewable energy production tax credit	10 years
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%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	62.00%	55.00%
State income tax, net of federal income tax benefit	5.00%	3.00%
Effective Income Tax Rate Reconciliation Regulatory Differences	14.00%	10.00%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	(1.00%)	1.00%
Effective income tax rate	(35.00%)	(28.00%)
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	$ 4	$ 0

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8	$ 8
Interest cost	31	30
Expected return on plan assets	(40)	(42)
Net amortization	11	13
Net periodic benefit cost	10	9
Domestic Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	4
Interest cost	8	7
Expected return on plan assets	(11)	(12)
Net amortization	(3)	(3)
Net periodic benefit cost	(3)	(4)
UK Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	6
Interest cost	19	20
Expected return on plan assets	(29)	(29)
Net amortization	12	16
Net periodic benefit cost	$ 7	$ 13

Employee Benefit Plans - Employ

Employee Benefit Plans - Employer Contributions (Details) - 3 months ended Mar. 31, 2016 £ in Millions, $ in Millions	USD ($)	GBP (£)
Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	$ 34
Employer contributions	3
Domestic Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	1
UK Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year | £		£ 40
Employer contributions	$ 17	£ 12

Employee Benefit Plans Employee

Employee Benefit Plans Employee Benefit Plans - PacifiCorp (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8	$ 8
Interest cost	31	30
Expected return on plan assets	(40)	(42)
Net amortization	11	13
Net periodic benefit cost	10	9
Domestic Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	4
Interest cost	8	7
Expected return on plan assets	(11)	(12)
Net amortization	(3)	(3)
Net periodic benefit cost	(3)	(4)
PacifiCorp [Member] | Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1
Interest cost	14	13
Expected return on plan assets	(19)	(19)
Net amortization	8	10
Net periodic benefit cost	4	5
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1
Interest cost	4	4
Expected return on plan assets	(6)	(6)
Net amortization	(1)	(1)
Net periodic benefit cost	$ (2)	$ (2)

Employee Benefit Plans Employ76

Employee Benefit Plans Employee Benefit Plans - PacifiCorp - Employer Contributions (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016USD ($)
Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	$ 34
Employer contributions	3
Domestic Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	1
PacifiCorp [Member] | Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	4
Employer contributions	1
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	0
Employer contributions	$ 0

Employee Benefit Plans - MEC (D

Employee Benefit Plans - MEC (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8	$ 8
Interest cost	31	30
Expected return on plan assets	(40)	(42)
Net amortization	11	13
Net periodic benefit cost	10	9
Domestic Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	4
Interest cost	8	7
Expected return on plan assets	(11)	(12)
Net amortization	(3)	(3)
Net periodic benefit cost	(3)	(4)
MidAmerican Energy Company [Member] | Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3
Interest cost	8	8
Expected return on plan assets	(11)	(11)
Net periodic benefit cost	0	0
MidAmerican Energy Company [Member] | Domestic Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	2
Interest cost	2	2
Expected return on plan assets	(3)	(4)
Net amortization	(1)	(1)
Net periodic benefit cost	$ (1)	$ (1)

Employee Benefit Plans Employ78

Employee Benefit Plans Employee Benefit Plans - MEC - Employer Contributions (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016USD ($)
Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	$ 34
Employer contributions	3
Domestic Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	1
MidAmerican Energy Company [Member] | Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	8
Employer contributions	2
MidAmerican Energy Company [Member] | Domestic Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected contributions in current fiscal year	1
Employer contributions	$ 0

Employee Benefit Plans - NPC -

Employee Benefit Plans - NPC - Amounts Payable (Details) - Nevada Power Company [Member] - NV Energy, Inc. [Member] - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Other Noncurrent Liabilities [Member] | Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	$ (40)	$ (38)
Other Noncurrent Liabilities [Member] | Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	(9)	(9)
Other Noncurrent Liabilities [Member] | Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	(5)	(5)
Other Current Liabilities [Member] | Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities	$ 1	$ 1

Employee Benefit Plans - SPPC -

Employee Benefit Plans - SPPC - Amounts Payable (Details) - Sierra Pacific Power Company [Member] - NV Energy, Inc. [Member] - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Other Noncurrent Liabilities [Member] | Domestic Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	$ 29	$ 29
Other Noncurrent Liabilities [Member] | Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	9	9
Other Noncurrent Liabilities [Member] | Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	32	32
Other Current Liabilities [Member] | Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities	$ 1	$ 1

Risk Management and Hedging A81

Risk Management and Hedging Activities - Balance Sheet Location (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	$ (264)	$ (237)
Cash collateral, net receivable, offset against derivative positions	113	103
Derivative assets (liabilities), at fair value, net	(151)	(134)
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	30	28
Cash collateral, net receivable, offset against derivative positions	0	0
Derivative assets (liabilities), at fair value, net	30	28
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	85	75
Cash collateral, net receivable, offset against derivative positions	0	0
Derivative assets (liabilities), at fair value, net	85	75
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(162)	(145)
Cash collateral, net receivable, offset against derivative positions	47	40
Derivative assets (liabilities), at fair value, net	(115)	(105)
Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(217)	(195)
Cash collateral, net receivable, offset against derivative positions	66	63
Derivative assets (liabilities), at fair value, net	(151)	(132)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(180)	(188)
Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	30	28
Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	85	72
Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(111)	(109)
Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(184)	(179)
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(84)	(49)
Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	0	0
Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	0	3
Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(51)	(36)
Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(33)	(16)
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	118	106
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(292)	(292)
Derivative, fair value, net	(174)	(186)
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts	253	250	$ 255	$ 223
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	20	25
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(1)	(4)
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	85	72
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	11	7
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(117)	(113)
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	2	2
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(174)	(175)
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	0	3
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(73)	(50)
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	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 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	0	1
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(47)	(33)
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	0	2
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(26)	(17)
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	11	7
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(17)	(9)
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	11	7
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	(5)	(3)
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	(12)	(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	0	3
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(11)	(5)
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	0	3
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	(4)	(4)
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	$ (7)	$ (1)

Risk Management and Hedging A82

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
	Mar. 31, 2016	Mar. 31, 2015
Regulatory Assets (Liabilities), Net, Derivatives [Roll Forward]
Beginning balance	$ 250	$ 223
Changes in fair value recognized in net regulatory assets	36	60
Net gains reclassified to operating revenue	0	9
Net losses reclassified to cost of sales	(33)	(37)
Ending balance	$ 253	$ 255

Risk Management and Hedging A83

Risk Management and Hedging Activities - Designated as Hedging Contracts (Details) - Designated as Hedging Instrument [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive (Income) Loss, Net, Derivatives [Roll Forward]
Cash flow hedge ineffectiveness	insignificant	insignificant
Cash flow hedge loss to be reclassified within twelve months	$ 51
Commodity derivative [Member]
Accumulated Other Comprehensive (Income) Loss, Net, Derivatives [Roll Forward]
Beginning balance	46	$ 32
Changes in fair value recognized in OCI	48	(8)
Net gains reclassified to operating revenue	0	1
Net (losses) gains reclassified to cost of sales	(22)	2
Ending balance	$ 72	$ 27

Risk Management and Hedging A84

Risk Management and Hedging Activities - Derivative Contract Volumes (Details) gal in Millions, MWh in Millions, Dth in Millions, $ in Millions	Mar. 31, 2016USD ($)MWhgalDth	Dec. 31, 2015USD ($)MWhgalDth
Electricity purchases (in megawatt hours) [Member] | Commodity derivative [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | MWh	11	10
Natural gas purchases (in decatherms) [Member] | Commodity derivative [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | Dth	360	317
Fuel purchases (in gallons) [Member] | Commodity derivative [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | gal	9	11
Interest rate swap [Member] | Interest Rate Contract [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, notional amount	$ (653)	$ (653)
Mortgage sale commitments, net [Member] | Interest Rate Contract [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, notional amount	$ (213)	$ (312)

Risk Management and Hedging A85

Risk Management and Hedging Activities - Collateral and Contingent Features (Details) - Commodity derivative [Member] - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Derivative, net liability position, aggregate fair value	$ 309	$ 288
Collateral already posted, aggregate fair value	78	75
Additional collateral, aggregate fair value	$ 220	$ 198

Risk Management and Hedging A86

Risk Management and Hedging Activities - PacifiCorp - Balance Sheet Location (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	$ (264)	$ (237)
Cash collateral, net receivable, offset against derivative positions	113	103
Derivative assets (liabilities), at fair value, net	(151)	(134)
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	30	28
Cash collateral, net receivable, offset against derivative positions	0	0
Derivative assets (liabilities), at fair value, net	30	28
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	85	75
Cash collateral, net receivable, offset against derivative positions	0	0
Derivative assets (liabilities), at fair value, net	85	75
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(162)	(145)
Cash collateral, net receivable, offset against derivative positions	47	40
Derivative assets (liabilities), at fair value, net	(115)	(105)
Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(217)	(195)
Cash collateral, net receivable, offset against derivative positions	66	63
Derivative assets (liabilities), at fair value, net	(151)	(132)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(180)	(188)
Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	30	28
Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	85	72
Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(111)	(109)
Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(184)	(179)
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	118	106
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(292)	(292)
Derivative, fair value, net	(174)	(186)
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts	253	250	$ 255	$ 223
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	20	25
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(1)	(4)
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	85	72
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	11	7
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(117)	(113)
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	2	2
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(174)	(175)
PacifiCorp [Member] | Commodity derivative [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(148)	(136)
Cash collateral, net receivable, offset against derivative positions	78	75
Derivative assets (liabilities), at fair value, net	(70)	(61)
PacifiCorp [Member] | Commodity derivative [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	4	9
Cash collateral, net receivable, offset against derivative positions	0	0
Derivative assets (liabilities), at fair value, net	4	9
PacifiCorp [Member] | Commodity derivative [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	0	0
Cash collateral, net receivable, offset against derivative positions	0	0
Derivative assets (liabilities), at fair value, net	0	0
PacifiCorp [Member] | Commodity derivative [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(63)	(56)
Cash collateral, net receivable, offset against derivative positions	19	18
Derivative assets (liabilities), at fair value, net	(44)	(38)
PacifiCorp [Member] | Commodity derivative [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(89)	(89)
Cash collateral, net receivable, offset against derivative positions	59	57
Derivative assets (liabilities), at fair value, net	(30)	(32)
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	12
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(155)	(148)
Derivative, fair value, net	(148)	(136)
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts	144	133	$ 130	$ 85
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	5	10
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(1)	(1)
Derivative, fair value, net	4	9
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	0	0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	0	0
Derivative, fair value, net	0	0
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	2
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(65)	(58)
Derivative, fair value, net	(63)	(56)
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	(89)	(89)
Derivative, fair value, net	$ (89)	$ (89)

Risk Management and Hedging A87

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
	Mar. 31, 2016	Mar. 31, 2015
Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Instruments [Line Items]
Beginning balance	$ 250	$ 223
Changes in fair value recognized in net regulatory assets	36	60
Net gains reclassified to operating revenue	0	9
Ending balance	253	255
PacifiCorp [Member]
Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Instruments [Line Items]
Beginning balance	133	85
Changes in fair value recognized in net regulatory assets	26	48
Net gains reclassified to operating revenue	8	25
Net Gains (Losses) Reclassified To Cost Of Domestic Regulated Electric	(23)	(28)
Ending balance	$ 144	$ 130

Risk Management and Hedging A88

Risk Management and Hedging Activities - PacifiCorp - Derivative Contract Volumes (Details) - Commodity derivative [Member] gal in Millions, MWh in Millions, Dth in Millions	Mar. 31, 2016MWhgalDth	Dec. 31, 2015MWhgalDth
Electricity purchases (in megawatt hours) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | MWh	11	10
Natural gas purchases (in decatherms) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | Dth	360	317
Fuel purchases (in gallons) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | gal	9	11
PacifiCorp [Member] | Electricity purchases (in megawatt hours) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | MWh	2	1
PacifiCorp [Member] | Natural gas purchases (in decatherms) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | Dth	107	111
PacifiCorp [Member] | Fuel purchases (in gallons) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | gal	9	11

Risk Management and Hedging A89

Risk Management and Hedging Activities - PacifiCorp - Collateral and Contingent Features (Details) - Commodity derivative [Member] - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Derivative, net liability position, aggregate fair value	$ 309	$ 288
Collateral already posted, aggregate fair value	78	75
Additional collateral, aggregate fair value	220	198
PacifiCorp [Member]
Derivative [Line Items]
Derivative, net liability position, aggregate fair value	149	142
Collateral already posted, aggregate fair value	78	75
Additional collateral, aggregate fair value	$ 68	$ 64

Risk Management and Hedging A90

Risk Management and Hedging Activities - MEC - Balance Sheet Location (Details) - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		$ (264)	$ (237)
Cash collateral, net receivable, offset against derivative positions		113	103
Derivative assets (liabilities), at fair value, net		(151)	(134)
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		30	28
Cash collateral, net receivable, offset against derivative positions		0	0
Derivative assets (liabilities), at fair value, net		30	28
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		85	75
Cash collateral, net receivable, offset against derivative positions		0	0
Derivative assets (liabilities), at fair value, net		85	75
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		(162)	(145)
Cash collateral, net receivable, offset against derivative positions		47	40
Derivative assets (liabilities), at fair value, net		(115)	(105)
Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		(217)	(195)
Cash collateral, net receivable, offset against derivative positions		66	63
Derivative assets (liabilities), at fair value, net		(151)	(132)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		(180)	(188)
Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		30	28
Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		85	72
Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		(111)	(109)
Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		(184)	(179)
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		(84)	(49)
Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		0	0
Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		0	3
Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		(51)	(36)
Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		(33)	(16)
Commodity derivative [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts		253	250	$ 255	$ 223
Derivative asset, fair value, gross asset including not subject to master netting arrangement		118	106
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		292	292
Derivative, fair value, net		(174)	(186)
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		20	25
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		1	4
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		85	72
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		11	7
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		117	113
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		2	2
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		174	175
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		0	3
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		73	50
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	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 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		0	1
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		47	33
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		0	2
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		26	17
MidAmerican Energy Company [Member] | Commodity derivative [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		(8)	(72)
Cash collateral, net receivable, offset against derivative positions		6	28
Derivative assets (liabilities), at fair value, net		(2)	(44)
MidAmerican Energy Company [Member] | Commodity derivative [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		3	9
Cash collateral, net receivable, offset against derivative positions		0	0
Derivative assets (liabilities), at fair value, net		3	9
MidAmerican Energy Company [Member] | Commodity derivative [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		0	4
Cash collateral, net receivable, offset against derivative positions		0	0
Derivative assets (liabilities), at fair value, net		0	4
MidAmerican Energy Company [Member] | Commodity derivative [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		(10)	(62)
Cash collateral, net receivable, offset against derivative positions		6	22
Derivative assets (liabilities), at fair value, net		(4)	(40)
MidAmerican Energy Company [Member] | Commodity derivative [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, fair value, net		(1)	(23)
Cash collateral, net receivable, offset against derivative positions		0	6
Derivative assets (liabilities), at fair value, net		(1)	(17)
MidAmerican Energy Company [Member] | Commodity derivative [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts		11	20	$ 18	$ 38
Derivative asset, fair value, gross asset including not subject to master netting arrangement	[1]	4	23
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	[1]	12	49
Derivative, fair value, net	[1]	(8)	(26)
MidAmerican Energy Company [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	[1]	3	12
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	[1]	0	3
Derivative, fair value, net	[1]	3	9
MidAmerican Energy Company [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]	0	4
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	[1]	0	0
Derivative, fair value, net	[1]	0	4
MidAmerican Energy Company [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	[1]	1	5
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	[1]	11	36
Derivative, fair value, net	[1]	(10)	(31)
MidAmerican Energy Company [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	[1]	0	2
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	[1]	1	10
Derivative, fair value, net	[1]	(1)	(8)
MidAmerican Energy Company [Member] | 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		0	3
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0	49
Derivative, fair value, net		0	(46)
MidAmerican Energy Company [Member] | 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	0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0	0
Derivative, fair value, net		0	0
MidAmerican Energy Company [Member] | 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
Derivative, fair value, net		0	0
MidAmerican Energy Company [Member] | 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		0	1
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0	32
Derivative, fair value, net		0	(31)
MidAmerican Energy Company [Member] | 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		0	2
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0	17
Derivative, fair value, net		$ 0	$ (15)
[1]	(1)MidAmerican Energy's commodity derivatives not designated as hedging contracts are generally included in regulated rates, and as of March 31, 2016 and December 31, 2015, a net regulatory asset of $11 million and $20 million, respectively, was recorded related to the net derivative liability of $8 million and $26 million, respectively.

Risk Management and Hedging A91

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
	Mar. 31, 2016	Mar. 31, 2015
Regulatory Assets (Liabilities), Net, Derivatives [Roll Forward]
Beginning balance	$ 250	$ 223
Changes in fair value recognized in net regulatory assets	36	60
Net gains reclassified to operating revenue	0	9
Ending balance	253	255
MidAmerican Energy Company [Member]
Regulatory Assets (Liabilities), Net, Derivatives [Roll Forward]
Beginning balance	20	38
Changes in fair value recognized in net regulatory assets	6	2
Net gains reclassified to operating revenue	(8)	(16)
Net Gains (Losses) Reclassified To Cost Of Natural Gas Purchases	(7)	(6)
Ending balance	$ 11	$ 18

Risk Management and Hedging A92

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
	Mar. 31, 2016	Mar. 31, 2015
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	$ (46)	$ (32)
Changes in fair value recognized in OCI	48	(8)
Accumulated other comprehensive income (loss), net, cummulative net gain (loss) from cash flow hedges, effect before taxes	(72)	(27)
MidAmerican Energy Company [Member]
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	(45)	(34)
Cumulative Net Gain (Loss) From Cash Flow Hedges, Before Taxes Transferred to Affiliate	(45)	0
Changes in fair value recognized in OCI	0	(6)
Cash Flow Hedge Gain (Loss) Reclassified To Cost Of Sales Nonregulated	0	2
Accumulated other comprehensive income (loss), net, cummulative net gain (loss) from cash flow hedges, effect before taxes	$ 0	$ (30)

Risk Management and Hedging A93

Risk Management and Hedging Activities - MEC - Derivative Contract Volumes (Details) - Commodity derivative [Member] MWh in Millions, Dth in Millions	Mar. 31, 2016MWhDth	Dec. 31, 2015MWhDth
Electricity purchases (in megawatt hours) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | MWh	11	10
Electricity purchases (in megawatt hours) [Member] | MidAmerican Energy Company [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | MWh	0	15
Natural gas purchases (in decatherms) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | Dth	360	317
Natural gas purchases (in decatherms) [Member] | MidAmerican Energy Company [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | Dth	12	17

Risk Management and Hedging A94

Risk Management and Hedging Activities - MEC - Collateral and Contingent Features (Details) - Commodity derivative [Member] - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Collateral already posted, aggregate fair value	$ 78	$ 75
Derivative, net liability position, aggregate fair value	309	288
Additional collateral, aggregate fair value	220	198
MidAmerican Energy Company [Member]
Derivative [Line Items]
Collateral already posted, aggregate fair value	0	0
Derivative, net liability position, aggregate fair value	7	66
Additional collateral, aggregate fair value	$ 4	$ 55

Risk Management and Hedging A95

Risk Management and Hedging Activities - NPC - Balance Sheet Location (Details) - Commodity derivative [Member] - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		$ 292	$ 292
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts		253	250	$ 255	$ 223
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		117	113
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		174	175
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]	9	8
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]	13	14
Recurring [Member] | Nevada Power Company [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		22	22
Recurring [Member] | Level 3 [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		43	46
Recurring [Member] | Level 3 [Member] | Nevada Power Company [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	[1]	22	22
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts		$ 22	$ 22
[1]	(1)Nevada Power's commodity derivatives not designated as hedging contracts are included in regulated rates and as of March 31, 2016 and December 31, 2015, a regulatory asset of $22 million was recorded related to the derivative liability of $22 million.

Risk Management and Hedging A96

Risk Management and Hedging Activities - NPC - Derivative Contract Volumes (Details) - Commodity derivative [Member] MWh in Millions, Dth in Millions	Mar. 31, 2016MWhDth	Dec. 31, 2015MWhDth
Electricity purchases (in megawatt hours) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | MWh	11	10
Natural gas purchases (in decatherms) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | Dth	360	317
Nevada Power Company [Member] | Electricity purchases (in megawatt hours) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | MWh	2	2
Nevada Power Company [Member] | Natural gas purchases (in decatherms) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, nonmonetary notional amount | Dth	169	126

Risk Management and Hedging A97

Risk Management and Hedging Activities - NPC - Collateral and Contingent Features (Details) - Commodity derivative [Member] - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Derivative, net liability position, aggregate fair value	$ 309	$ 288
Nevada Power Company [Member]
Derivative [Line Items]
Derivative, net liability position, aggregate fair value	$ 4	$ 3

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Millions	Mar. 31, 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	$ 113	$ 103
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	(14)	(16)
Assets, fair value disclosure	2,767	2,692
Derivative liability, fair value, gross asset and right to reclaim cash, offset	127	119
Derivative liabilities	(266)	(237)
Cash collateral, net receivable, offset against derivative positions	113	103
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	2,347	2,173
Derivative liabilities	(10)	(13)
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	296	393
Derivative liabilities	(340)	(296)
Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	138	142
Derivative liabilities	(43)	(47)
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	237	327
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
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	237	327
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
Money market mutual funds [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	504	421
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	504	421
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
United States government obligations [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	142	133
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	142	133
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
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
International government obligations [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2	2
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
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	2	2
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
Corporate obligations [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	34	39
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
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	34	39
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
Municipal obligations [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2	1
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
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	1
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
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	4	3
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
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	4	3
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
Auction rate securities [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	26	44
Auction rate securities [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
Auction rate securities [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
Auction rate securities [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	26	44
United States companies [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	242	239
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	242	239
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
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
International companies [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1,298	1,244
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	1,298	1,244
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
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
Investment funds [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	161	136
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	161	136
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
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
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	(14)	(16)
Derivative assets	104	93
Derivative liability, fair value, gross asset and right to reclaim cash, offset	127	119
Derivative liabilities	(238)	(223)
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	(10)	(13)
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	17	16
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(312)	(283)
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	101	93
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(43)	(46)
Interest Rate Contract [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	11	10
Derivative liabilities	(28)	(14)
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
Derivative liability, fair value, gross liability including not subject to master netting arrangement	0	0
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	0	5
Derivative liability, fair value, gross liability including not subject to master netting arrangement	(28)	(13)
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	11	5
Derivative liability, fair value, gross liability including not subject to master netting arrangement	$ 0	$ (1)

Fair Value Measurements - Level

Fair Value Measurements - Level 3 (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Commodity derivative [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 47	$ 51
Changes included in earnings	19	8
Changes in fair value recognized in other comprehensive income	(6)	1
Changes in fair value recognized in net regulatory assets	(6)	(3)
Purchases	0
Settlements	4	(8)
Transfers from Level 2		0
Ending balance	58	49
Interest Rate Lock Commitments [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	4	0
Changes included in earnings	25	21
Changes in fair value recognized in other comprehensive income	0	0
Changes in fair value recognized in net regulatory assets	0	0
Purchases	0
Settlements	(18)	0
Transfers from Level 2		3
Ending balance	11	8
Auction rate securities [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	44	45
Changes included in earnings	0	0
Changes in fair value recognized in other comprehensive income	4	(1)
Changes in fair value recognized in net regulatory assets	0	0
Purchases	(22)
Settlements	0	(16)
Transfers from Level 2		0
Ending balance	$ 26	$ 44

Fair Value Measurements - Debt

Fair Value Measurements - Debt (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 37,313	$ 37,972
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 42,878	$ 41,785

Fair Value Measurements - Pacif

Fair Value Measurements - PacifiCorp (Details) - USD ($) $ in Millions	Mar. 31, 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	$ 113	$ 103
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	(14)	(16)
Assets, fair value disclosure	2,767	2,692
Derivative liability, fair value, gross asset and right to reclaim cash, offset	127	119
Derivative Liability	(266)	(237)
Cash collateral, net receivable, offset against derivative positions	113	103
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	2,347	2,173
Derivative Liability	(10)	(13)
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	296	393
Derivative Liability	(340)	(296)
Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	138	142
Derivative Liability	(43)	(47)
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	(14)	(16)
Derivative assets	104	93
Derivative liability, fair value, gross asset and right to reclaim cash, offset	127	119
Derivative Liability	(238)	(223)
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	(10)	(13)
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	17	16
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(312)	(283)
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	101	93
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(43)	(46)
Money market mutual funds [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	504	421
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	504	421
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	161	136
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	161	136
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	197	37
PacifiCorp [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	193	28
PacifiCorp [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	6	9
PacifiCorp [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure	1	3
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	78	75
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)	(3)
Derivative assets	4	9
Derivative liability, fair value, gross asset and right to reclaim cash, offset	81	78
Derivative Liability	(74)	70
Cash collateral, net receivable, offset against derivative positions	78	75
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	6	9
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	(155)	(148)
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	1	3
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	178	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	178	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	15	15
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	15	15
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 - Pa102

Fair Value Measurements - PacifiCorp - Debt (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 37,313	$ 37,972
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	42,878	41,785
PacifiCorp [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	7,061	7,114
PacifiCorp [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 8,437	$ 8,210

Fair Value Measurements - MEC (

Fair Value Measurements - MEC (Details) - USD ($) $ in Millions		Mar. 31, 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		$ 113	$ 103
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash collateral, net receivable, offset against derivative positions		113	103
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		14	16
Assets, fair value disclosure		2,767	2,692
Derivative liability, fair value, gross asset and right to reclaim cash, offset		127	119
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		2,347	2,173
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		296	393
Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		138	142
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		14	16
Derivative liability, fair value, gross asset and right to reclaim cash, offset		127	119
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		10	13
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		17	16
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		312	283
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		101	93
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		43	46
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		6	28
Assets, fair value disclosure		475	522
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		404	438
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		45	53
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		27	44
MidAmerican Energy Company [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		6	28
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		3	13
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[1]	1	13
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		5	57
Derivative liability, fair value, gross asset and right to reclaim cash, offset	[1]	7	41
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		3	13
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		3	8
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		4	61
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		1	18
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		5	24
Money market mutual funds [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		504	421
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		504	421
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
Money market mutual funds [Member] | MidAmerican Energy Company [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[2]	4	56
Money market mutual funds [Member] | MidAmerican Energy Company [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[2]	4	56
Money market mutual funds [Member] | MidAmerican Energy Company [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[2]	0	0
Money market mutual funds [Member] | MidAmerican Energy Company [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[2]	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		142	133
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		142	133
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
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
United States government obligations [Member] | MidAmerican Energy Company [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		142	133
United States government obligations [Member] | MidAmerican Energy Company [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		142	133
United States government obligations [Member] | MidAmerican Energy Company [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
United States government obligations [Member] | MidAmerican Energy Company [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
International government obligations [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		2	2
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
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		2	2
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
International government obligations [Member] | MidAmerican Energy Company [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		2	2
International government obligations [Member] | MidAmerican Energy Company [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
International government obligations [Member] | MidAmerican Energy Company [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
International government obligations [Member] | MidAmerican Energy Company [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
Corporate obligations [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		34	39
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
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		34	39
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
Corporate obligations [Member] | MidAmerican Energy Company [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		34	39
Corporate obligations [Member] | MidAmerican Energy Company [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
Corporate obligations [Member] | MidAmerican Energy Company [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		34	39
Corporate obligations [Member] | MidAmerican Energy Company [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
Municipal obligations [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		2	1
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
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	1
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
Municipal obligations [Member] | MidAmerican Energy Company [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		2	1
Municipal obligations [Member] | MidAmerican Energy Company [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
Municipal obligations [Member] | MidAmerican Energy Company [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		2	1
Municipal obligations [Member] | MidAmerican Energy Company [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
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		4	3
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
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		4	3
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
Agency, asset and mortgage-backed obligations [Member] | MidAmerican Energy Company [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		4	3
Agency, asset and mortgage-backed obligations [Member] | MidAmerican Energy Company [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
Agency, asset and mortgage-backed obligations [Member] | MidAmerican Energy Company [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		4	3
Agency, asset and mortgage-backed obligations [Member] | MidAmerican Energy Company [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
Auction rate securities [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		26	44
Auction rate securities [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
Auction rate securities [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
Auction rate securities [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		26	44
Auction rate securities [Member] | MidAmerican Energy Company [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		26	26
Auction rate securities [Member] | MidAmerican Energy Company [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
Auction rate securities [Member] | MidAmerican Energy Company [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
Auction rate securities [Member] | MidAmerican Energy Company [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		26	26
United States companies [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		242	239
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		242	239
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
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
United States companies [Member] | MidAmerican Energy Company [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		242	239
United States companies [Member] | MidAmerican Energy Company [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		242	239
United States companies [Member] | MidAmerican Energy Company [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
United States companies [Member] | MidAmerican Energy Company [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
International companies [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		1,298	1,244
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		1,298	1,244
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
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
International companies [Member] | MidAmerican Energy Company [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		7	6
International companies [Member] | MidAmerican Energy Company [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		7	6
International companies [Member] | MidAmerican Energy Company [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
International companies [Member] | MidAmerican Energy Company [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		161	136
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		161	136
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
Investment funds [Member] | MidAmerican Energy Company [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		9	4
Investment funds [Member] | MidAmerican Energy Company [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		9	$ 4
Investment funds [Member] | MidAmerican Energy Company [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		0
Investment funds [Member] | MidAmerican Energy Company [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities		$ 0
[1]	Represents netting under master netting arrangements and a net cash collateral receivable of $6 million and $28 million as of March 31, 2016 and December 31, 2015, 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 Measurements - MEC -

Fair Value Measurements - MEC - Level 3 (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Derivative [Member] | MidAmerican Energy Company [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ (6)	$ 12
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Transferred To Affiliate	(4)
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings		(2)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included in Other Comprehensive Income (Loss)	0	(1)
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net	1
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	0
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Assets and Liability, Net, Settlements	(7)	6
Ending balance	(4)	9
Auction rate securities [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	44	45
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included in Other Comprehensive Income (Loss)	(4)	1
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	22
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Assets and Liability, Net, Settlements	0	16
Ending balance	26	44
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	26	26
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Transferred To Affiliate	0
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included in Other Comprehensive Income (Loss)	(1)	0
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(1)
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Assets and Liability, Net, Settlements	0	0
Ending balance	$ 26	$ 26

Fair Value Measurements - ME105

Fair Value Measurements - MEC - Debt (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 37,313	$ 37,972
MidAmerican Energy Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	4,268	4,271
Long-term debt, fair value		4,636
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	42,878	$ 41,785
Level 2 [Member] | MidAmerican Energy Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 4,847

Fair Value Measurements - MidAm

Fair Value Measurements - MidAmerican Funding - Debt (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 37,313	$ 37,972
MidAmerican Funding, LLC and Subsidiaries [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	4,594	4,597
Long-term debt, fair value		5,051
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	42,878	$ 41,785
Level 2 [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 5,280

Fair Value Measurements - NPC (

Fair Value Measurements - NPC (Details) - Recurring [Member] - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Nevada Power Company [Member] | Investment Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Funds		$ 5	$ 5
Nevada Power Company [Member] | Investment Funds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Funds		5	5
Nevada Power Company [Member] | Investment Funds [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Funds		0	0
Nevada Power Company [Member] | Investment Funds [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Funds		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		10	13
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		312	283
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		43	46
Commodity derivative [Member] | Nevada Power Company [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		22	22
Commodity derivative [Member] | Nevada Power Company [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
Commodity derivative [Member] | Nevada Power Company [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
Commodity derivative [Member] | Nevada Power Company [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	[1]	$ 22	$ 22
[1]	(1)Nevada Power's commodity derivatives not designated as hedging contracts are included in regulated rates and as of March 31, 2016 and December 31, 2015, a regulatory asset of $22 million was recorded related to the derivative liability of $22 million.

Fair Value Measurements - NPC -

Fair Value Measurements - NPC - Level 3 (Details) - Nevada Power Company [Member] - Commodity [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ (22)	$ (30)
Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included In Regulatory Assets and Liabilities, Net	3	4
Fair Value, Measurements With Unobservable Inputs Reconciliation, Recurring Basis, Assets and Liability, Net, Settlements	(3)	(2)
Ending balance	$ (22)	$ (32)

Fair Value Measurements - NP109

Fair Value Measurements - NPC - Debt (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 37,313	$ 37,972
Nevada Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	2,579	2,788
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	42,878	41,785
Level 2 [Member] | Nevada Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 3,141	$ 3,240

Fair Value Measurements - SPPC

Fair Value Measurements - SPPC - Debt (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$ 37,313	$ 37,972
Sierra Pacific Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	1,166	1,165
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	42,878	41,785
Level 2 [Member] | Sierra Pacific Power Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 1,278	$ 1,248

Commitments and Contingencies -

Commitments and Contingencies - Legal Matters (Details) - PacifiCorp [Member] - USA Power [Member] $ in Millions	3 Months Ended
	Mar. 31, 2016USD ($)
Loss Contingencies [Line Items]
Loss contingency, damages and attorney fees awarded, value	$ 115
Loss contingency accrual, at carrying value	122
Damages from Breach of Contract, Awarded By Jury [Member]
Loss Contingencies [Line Items]
Loss contingency, damages awarded by jury, value	$ 18

Commitments and Contingencie112

Commitments and Contingencies - Commitments (Details) - PacifiCorp [Member] - Klamath Hydroelectric System [Member] $ in Millions	3 Months Ended
	Mar. 31, 2016USD ($)
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Dam removal cost limit	$ 200
OREGON
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Dam removal cost limit	184
CALIFORNIA
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Dam removal cost limit	16
Additional dam removal costs, California bond measure	$ 250

Commitments and Contingencies C

Commitments and Contingencies Commitments and Contingencies - PacifiCorp - Legal Matters (Details) - PacifiCorp [Member] - USA Power [Member] $ in Millions	3 Months Ended
	Mar. 31, 2016USD ($)
Loss Contingencies [Line Items]
Loss contingency, damages and attorney fees awarded, value	$ 115
Loss contingency, damages awarded, value	113
Loss Contingency Accrual	122
Amount Awarded for Actual Damages [Member]
Loss Contingencies [Line Items]
Loss contingency, damages awarded by jury, value	18
Damages from Unjust Enrichment, Awarded By Jury [Member]
Loss Contingencies [Line Items]
Loss contingency, damages awarded by jury, value	$ 113

Commitments and Contingencie114

Commitments and Contingencies Commitments and Contingencies - PacifiCorp - Hydroelectric (Details) - PacifiCorp [Member] - Klamath Hydroelectric System [Member] $ in Millions	3 Months Ended
	Mar. 31, 2016USD ($)
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 Contingencie115

Commitments and Contingencies Commitments and Contingencies - NPC - Environmental Laws and Regulations (Details) - Nevada Power Company [Member] - MW	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
812 Megawatts of Coal Energy [Member]
Supply Commitment [Line Items]
Coal-Fired Power Plant Capacity	812
15 Megawatts of Solar Renewable Energy [Member]
Supply Commitment [Line Items]
New Generation Capacity		15
100 Megawatts of Renewable Energy [Member]
Supply Commitment [Line Items]
New Generation Capacity	100	100
272 Megawatts of Renewable Energy [Member]
Supply Commitment [Line Items]
New Generation Capacity			272
210 Megawatts of Renewable Energy [Member]
Supply Commitment [Line Items]
New Generation Capacity			210
35 Megawatts of Renewable Energy [Member]
Supply Commitment [Line Items]
New Generation Capacity	35

Components of Accumulated Ot116

Components of Accumulated Other Comprehensive Loss, Net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - Accumulated other comprehensive loss, net	$ (908)
Other comprehensive income (loss), unrecognized amounts on retirement benefits	22	$ 22
Other comprehensive income (loss), foreign currency translation adjustment	67	(424)
Other comprehensive income (loss), unrealized gains on available-for-sale securities	33	166
Other comprehensive income (loss), unrealized gains on cash flow hedges	(23)	1
Other comprehensive income (loss)	99	(235)
Ending balance - Accumulated other comprehensive loss, net	(809)
Accumulated Other Comprehensive (Loss) Income, Net [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - unrecognized amounts on retirement benefits	(438)	(490)
Beginning balance - foreign currency translation adjustment	(1,092)	(412)
Beginning balance - unrealized gains on available-for-sale securities	615	390
Beginning balance - unrealized gains on cash flow hedges	7	18
Beginning balance - Accumulated other comprehensive loss, net	(908)	(494)
Other comprehensive income (loss), unrecognized amounts on retirement benefits	22	22
Other comprehensive income (loss), foreign currency translation adjustment	67	(424)
Other comprehensive income (loss), unrealized gains on available-for-sale securities	33	166
Other comprehensive income (loss), unrealized gains on cash flow hedges	(23)	1
Other comprehensive income (loss)	99	(235)
Ending balance - unrecognized amounts on retirement benefits	(416)	(468)
Ending balance - foreign currency translation adjustment	(1,025)	(836)
Ending balance - unrealized gains on available-for-sale securities	648	556
Ending balance - unrealized gains on cash flow hedges	(16)	19
Ending balance - Accumulated other comprehensive loss, net	$ (809)	$ (729)

Components of Accumulated Ot117

Components of Accumulated Other Comprehensive Loss, Net Components of Accumulated Other Comprehensive Loss, Net - MEC (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - Accumulated other comprehensive loss, net	$ (908)
Unrealized gains on available-for-sale securities, net of tax of $22 and $113	33	$ 166
Unrealized (losses) gains on cash flow hedges, net of tax of $(14) and $1	(23)	1
Other comprehensive income (loss)	99	(235)
Ending balance - Accumulated other comprehensive loss, net	(809)
Accumulated Other Comprehensive (Loss) Income, Net [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - unrealized gains on available-for-sale securities	615	390
Beginning balance - unrealized gains on cash flow hedges	7	18
Beginning balance - Accumulated other comprehensive loss, net	(908)	(494)
Unrealized gains on available-for-sale securities, net of tax of $22 and $113	33	166
Unrealized (losses) gains on cash flow hedges, net of tax of $(14) and $1	(23)	1
Other comprehensive income (loss)	99	(235)
Ending balance - unrealized gains on available-for-sale securities	648	556
Ending balance - unrealized gains on cash flow hedges	(16)	19
Ending balance - Accumulated other comprehensive loss, net	(809)	(729)
MidAmerican Energy Company [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - Accumulated other comprehensive loss, net	(30)
Unrealized gains on available-for-sale securities, net of tax of $22 and $113	1	0
Unrealized (losses) gains on cash flow hedges, net of tax of $(14) and $1	0	2
Other comprehensive income (loss)	1	2
Dividend, Noncash, Transfer Of Operations	90
Ending balance - Accumulated other comprehensive loss, net	(2)
MidAmerican Energy Company [Member] | Accumulated Other Comprehensive (Loss) Income, Net [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - unrealized gains on available-for-sale securities	(3)	(3)
Beginning balance - unrealized gains on cash flow hedges	(27)	(20)
Beginning balance - Accumulated other comprehensive loss, net	(30)	(23)
Unrealized gains on available-for-sale securities, net of tax of $22 and $113	1	0
Unrealized (losses) gains on cash flow hedges, net of tax of $(14) and $1	0	2
Other comprehensive income (loss)	1	2
Dividend, Noncash, Transfer Of Operations	27
Ending balance - unrealized gains on available-for-sale securities	(2)	(3)
Ending balance - unrealized gains on cash flow hedges	0	(18)
Ending balance - Accumulated other comprehensive loss, net	$ (2)	$ (21)

Segment Information (Details)

Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenues	$ 4,041	$ 4,221
Sales revenue from energy operations	3,550	3,773
Real estate	491	448
Depreciation and amortization - energy operations	619	581
Depreciation and amortization	626	587
Operating income	953	930
Interest expense	473	472
Capitalized interest	11	29
Allowance for equity funds	15	31
Interest and dividend income	27	26
Other, net	10	26
Income before income tax expense and equity income	543	570
Assets	84,246		$ 83,618
PacifiCorp [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	1,252	1,250
Depreciation and amortization - energy operations	197	194
Operating income	324	273
Interest expense	95	95
Assets	23,590		23,550
MidAmerican Funding [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	626	727
Depreciation and amortization - energy operations	110	100
Operating income	100	101
Interest expense	54	50
Assets	16,330		16,315
NV Energy, Inc. [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	615	706
Depreciation and amortization - energy operations	104	101
Operating income	89	121
Interest expense	67	63
Assets	14,438		14,656
Northern Powergrid [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	279	324
Depreciation and amortization - energy operations	50	48
Operating income	158	193
Interest expense	36	35
Assets	7,272		7,317
BHE Pipeline Group [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	315	332
Depreciation and amortization - energy operations	53	50
Operating income	192	200
Interest expense	13	18
Assets	5,101		4,953
BHE Transmission [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	158	125
Depreciation and amortization - energy operations	50	38
Operating income	76	46
Interest expense	36	36
Assets	8,136		7,553
BHE Renewables [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	139	124
Depreciation and amortization - energy operations	56	49
Operating income	24	6
Interest expense	49	46
Assets	6,156		5,892
HomeServices [Member]
Segment Reporting Information [Line Items]
Real estate	491	448
Depreciation and amortization	6	6
Operating income	(1)	(2)
Interest expense	1	1
Assets	1,684		1,705
BHE And Other [Member]
Segment Reporting Information [Line Items]
Sales revenue from energy operations	166	185
Depreciation and amortization - energy operations	0	1
Operating income	(9)	(8)
Interest expense	122	128
Assets	1,539		$ 1,677
UNITED STATES
Segment Reporting Information [Line Items]
Revenues	3,599	3,769
Income before income tax expense and equity income	358	358
UNITED KINGDOM
Segment Reporting Information [Line Items]
Revenues	279	324
Income before income tax expense and equity income	119	164
CANADA
Segment Reporting Information [Line Items]
Revenues	160	127
Income before income tax expense and equity income	43	35
The Philippines and other [Member]
Segment Reporting Information [Line Items]
Revenues	3	1
Income before income tax expense and equity income	$ 23	$ 13

Segment Information - Goodwill

Segment Information - Goodwill (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 9,076
Acquisitions	3
Foreign currency translation	72
Other	(6)
Ending balance	9,145
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	1,056
Acquisitions	0
Foreign currency translation	(20)
Other	0
Ending balance	1,036
BHE Pipeline Group [Member]
Goodwill [Roll Forward]
Beginning balance	101
Acquisitions	0
Foreign currency translation	0
Other	(6)
Ending balance	95
BHE Transmission [Member]
Goodwill [Roll Forward]
Beginning balance	1,428
Acquisitions	0
Foreign currency translation	91
Other	0
Ending balance	1,519
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	794
Acquisitions	3
Foreign currency translation	0
Other	0
Ending balance	797
Other [Member]
Goodwill [Roll Forward]
Beginning balance	2
Acquisitions	0
Foreign currency translation	1
Other	0
Ending balance	$ 3

Segment Information Segment Inf

Segment Information Segment Information - MEC (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016USD ($)OperatingSegmentsReportableSegments	Mar. 31, 2015USD ($)	Dec. 31, 2015USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | OperatingSegments	8
Revenues	$ 4,041	$ 4,221
Operating income	953	930
Assets	$ 84,246		$ 83,618
MidAmerican Energy Company [Member]
Segment Reporting Information [Line Items]
Number of reportable segments | ReportableSegments	2
Electric Domestic Regulated Revenue	$ 399	426
Revenues	625	722
Utilities Operating Expense, Depreciation and Amortization	110	100
Operating income	100	100
Assets	14,214		14,385
MidAmerican Energy Company [Member] | Regulated Electric [Member]
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue	399	426
Utilities Operating Expense, Depreciation and Amortization	99	90
Operating income	57	53
Assets	13,015		12,970
MidAmerican Energy Company [Member] | Regulated Gas [Member]
Segment Reporting Information [Line Items]
Gas Domestic Regulated Revenue	226	295
Utilities Operating Expense, Depreciation and Amortization	11	10
Operating income	43	47
Assets	1,199		1,251
MidAmerican Energy Company [Member] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Other Revenue, Net	0	$ 1
Assets	$ 0		$ 164

Segment Information Segment 121

Segment Information Segment Information - MidAmerican Funding (Details) $ in Millions		3 Months Ended
		Mar. 31, 2016USD ($)OperatingSegmentsReportableSegments	Mar. 31, 2015USD ($)	Dec. 31, 2015USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | OperatingSegments		8
Revenues		$ 4,041	$ 4,221
Operating income		953	930
Assets		$ 84,246		$ 83,618
MidAmerican Funding, LLC and Subsidiaries [Domain]
Segment Reporting Information [Line Items]
Number of reportable segments | ReportableSegments		2
Electric Domestic Regulated Revenue		$ 399	426
Revenues		626	727
Utilities Operating Expense, Depreciation and Amortization		110	100
Operating income		100	101
Assets	[1]	15,501		15,674
MidAmerican Funding, LLC and Subsidiaries [Domain] | Regulated Electric [Member]
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue		399	426
Utilities Operating Expense, Depreciation and Amortization		99	90
Operating income		57	53
Assets	[1]	14,206		14,161
MidAmerican Funding, LLC and Subsidiaries [Domain] | Regulated Gas [Member]
Segment Reporting Information [Line Items]
Gas Domestic Regulated Revenue		226	295
Utilities Operating Expense, Depreciation and Amortization		11	10
Operating income		43	47
Assets	[1]	1,278		1,330
MidAmerican Funding, LLC and Subsidiaries [Domain] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Other Revenue, Net		1	6
Operating income		0	$ 1
Assets	[1]	$ 17		$ 183
[1]	(1)Consists principally of cash and cash equivalents not included in either the regulated electric or regulated natural gas segments.

Segment Information Segment 122

Segment Information Segment Information - SPPC (Details) $ in Millions		3 Months Ended
		Mar. 31, 2016USD ($)OperatingSegmentsTheNumberOfReportableSegments	Mar. 31, 2015USD ($)	Dec. 31, 2015USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | OperatingSegments		8
Revenues		$ 4,041	$ 4,221
Cost of sales		1,095	1,354
Operating income		953	930
Interest expense		473	472
Assets		$ 84,246		$ 83,618
Sierra Pacific Power Company [Member]
Segment Reporting Information [Line Items]
Number of reportable segments | TheNumberOfReportableSegments		2
Electric Domestic Regulated Revenue		$ 170	196
Gas Domestic Regulated Revenue		47	50
Revenues		217	246
Cost of sales		70	97
Cost of Purchased Oil and Gas		30	35
Cost of Sales		100	132
Gross Margin		117	114
Utilities Operating Expense, Maintenance and Operations		41	36
Utilities Operating Expense, Depreciation and Amortization		29	28
Operating income		41	43
Interest expense		16	15
Assets		3,500		3,487
Sierra Pacific Power Company [Member] | Electric Operations [Member]
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue		170	196
Cost of sales		70	97
Gross Margin		100	99
Utilities Operating Expense, Maintenance and Operations		36	32
Utilities Operating Expense, Depreciation and Amortization		25	24
Operating income		33	37
Interest expense		14	14
Assets		3,031		3,060
Sierra Pacific Power Company [Member] | Natural Gas Operations [Member]
Segment Reporting Information [Line Items]
Gas Domestic Regulated Revenue		47	50
Cost of Purchased Oil and Gas		30	35
Gross Margin		17	15
Utilities Operating Expense, Maintenance and Operations		5	4
Utilities Operating Expense, Depreciation and Amortization		4	4
Operating income		8	6
Interest expense		2	$ 1
Assets		328		316
Sierra Pacific Power Company [Member] | Regulated common assets [Member]
Segment Reporting Information [Line Items]
Assets	[1]	$ 141		$ 111
[1]	(1)Consists principally of cash and cash equivalents not included in either the regulated electric or regulated natural gas segments.

Discontinued Operations - MEC (

Discontinued Operations - MEC (Details) - MidAmerican Energy Company and Subsidiaries [Member] - Unregulated Retail Services [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operations, Revenue	$ 224
Discontinued Operations, Cost of sales	212
Discontinued Operations, Cash flows from operations	$ 17
Discontinued Operations, Receivables		$ 115
Discontinued Operations, Derivative assets		41
Discontinued Operations, Deferred income tax assets, noncurrent		21
Discontinued Operations, Accounts payable		(49)
Discontinued Operations, Derivative liabilities		(42)
Discontinued Operations, Other assets and liabilities, net		4
Discontinued Operations, Net assets		90
Discontinued Operations, Accumulated other comprehensive loss, net		27
Discontinued Operations, Net assets and AOCI		$ 117