Midamerican Funding 10-Q 7 Nov 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document	9 Months Ended
	Sep. 30, 2014	Oct. 31, 2014
Entity Information [Line Items]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Entity Filer Category	'Non-accelerated Filer	'
Entity Registrant Name	'MIDAMERICAN ENERGY COMPANY	'
Entity Central Index Key	'0000928576	'
Current Fiscal Year End Date	'--12-31	'
Entity Common Stock, Shares Outstanding	'	70,980,203
MidAmerican Funding, LLC and Subsidiaries [Domain]	'	'
Entity Information [Line Items]	'	'
Entity Filer Category	'Non-accelerated Filer	'
Entity Registrant Name	'MIDAMERICAN FUNDING, LLC	'
Entity Central Index Key	'0001098296	'
Current Fiscal Year End Date	'--12-31	'

Balance_Sheets_MEC

Balance Sheets (MEC) (MidAmerican Energy Company [Member], USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
MidAmerican Energy Company [Member]	'	'
Utility plant, net:	'	'
Electric	$12,465	$11,936
Gas	1,403	1,365
Gross utility plant in service	13,868	13,301
Accumulated depreciation and amortization	-4,885	-4,710
Utility plant in service, net	8,983	8,591
Construction work in progress	1,150	737
Total utility plant, net	10,133	9,328
Current assets:	'	'
Cash and cash equivalents	396	194
Receivables, net	397	454
Income taxes receivable	0	50
Inventories	195	229
Other	63	64
Total current assets	1,051	991
Other assets:	'	'
Regulatory assets	881	748
Investments and nonregulated property, net	616	598
Other	214	204
Total other assets	1,711	1,550
Total assets	12,895	11,869
Capitalization:	'	'
MidAmerican Energy common shareholder's equity	4,220	3,845
Long-term debt, excluding current portion	4,054	3,202
Total capitalization	8,274	7,047
Current liabilities:	'	'
Current portion of long-term debt	0	350
Accounts payable	412	368
Taxes accrued	140	118
Interest accrued	36	37
Other	108	97
Total current liabilities	696	970
Other liabilities:	'	'
Deferred income taxes	2,349	2,294
Asset retirement obligations	449	430
Regulatory liabilities	874	875
Other	253	253
Total other liabilities	3,925	3,852
Total capitalization and liabilities	$12,895	$11,869

Statements_of_Operations_MEC

Statements of Operations (MEC) (MidAmerican Energy Company [Member], USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
MidAmerican Energy Company [Member]	'	'	'	'
Operating revenue:	'	'	'	'
Regulated electric	$539	$512	$1,415	$1,338
Regulated gas	99	98	746	555
Nonregulated	224	216	695	610
Total operating revenue	862	826	2,856	2,503
Regulated operating costs and expenses:	'	'	'	'
Cost of fuel, energy and capacity	139	145	405	382
Cost of gas sold	54	55	546	367
Other operating expenses	119	103	351	320
Maintenance	50	57	171	172
Depreciation and amortization	88	97	258	308
Property and other taxes	31	29	92	89
Total regulated operating costs and expenses	481	486	1,823	1,638
Nonregulated operating costs and expenses:	'	'	'	'
Cost of sales	213	203	648	567
Other	8	7	21	19
Total nonregulated operating costs and expenses	221	210	669	586
Total operating costs and expenses	702	696	2,492	2,224
Operating income	160	130	364	279
Non-operating income:	'	'	'	'
Interest income	0	0	1	1
Allowance for equity funds	11	4	30	12
Other, net	2	3	7	10
Total non-operating income	13	7	38	23
Fixed charges:	'	'	'	'
Interest on long-term debt	44	36	129	106
Other interest expense	0	0	1	1
Allowance for borrowed funds	-4	-1	-12	-4
Total fixed charges	40	35	118	103
Income before income tax (benefit) expense	133	102	284	199
Income tax (benefit) expense	-37	-43	-75	-73
Net income	170	145	359	272
Preferred dividends	0	0	0	1
Earnings on common stock	$170	$145	$359	$271

Statements_of_Comprehensive_In

Statements of Comprehensive Income (MEC) (MidAmerican Energy Company [Member], USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
MidAmerican Energy Company [Member]	'	'	'	'
Net income	$170	$145	$359	$272
Other comprehensive income (loss), net of tax:	'	'	'	'
Unrealized gains on available-for-sale securities, net of tax of $-, $-, $1 and $1	0	1	1	1
Unrealized gains (losses) on cash flow hedges, net of tax of $(6), $-, $10 and $3	-8	-1	15	3
Total other comprehensive income (loss), net of tax	-8	0	16	4
Comprehensive income	$162	$145	$375	$276

Statements_of_Comprehensive_In1

Statements of Comprehensive Income (MEC) (Parenthetical) (MidAmerican Energy Company [Member], USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
MidAmerican Energy Company [Member]	'	'	'	'
Unrealized gains on available-for-sale securities, tax	$0	$0	$1	$1
Unrealized gains (losses) on cash flow hedges, tax	($6)	$0	$10	$3

Statements_of_Changes_in_Equit

Statements of Changes in Equity (MEC) (MidAmerican Energy Company [Member], USD $)	MidAmerican Energy Company [Member]	MidAmerican Energy Company [Member]	MidAmerican Energy Company [Member]	MidAmerican Energy Company [Member]	MidAmerican Energy Company [Member]
In Millions, unless otherwise specified	USD ($)	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss), Net [Member]	Preferred Securities [Member]
		USD ($)	USD ($)	USD ($)	USD ($)
Balance at Dec. 31, 2012	$3,635	$562	$3,070	($24)	$27
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'
Net income	272	'	272	'	'
Other comprehensive income (loss)	4	'	'	4	'
Redemption of preferred securities	-28	-1	'	'	-27
Common dividends	-125	'	-125	'	'
Balance at Sep. 30, 2013	3,758	561	3,217	-20	0
Balance at Jun. 30, 2013	'	'	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'
Net income	145	'	'	'	'
Other comprehensive income (loss)	0	'	'	'	'
Balance at Sep. 30, 2013	3,758	'	'	'	'
Balance at Dec. 31, 2013	3,845	561	3,295	-11	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'
Net income	359	'	359	'	'
Other comprehensive income (loss)	16	'	'	16	'
Balance at Sep. 30, 2014	4,220	561	3,654	5	0
Balance at Jun. 30, 2014	'	'	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'
Net income	170	'	'	'	'
Other comprehensive income (loss)	-8	'	'	'	'
Balance at Sep. 30, 2014	$4,220	$561	'	'	$0

Statements_of_Cash_Flows_MEC

Statements of Cash Flows (MEC) (MidAmerican Energy Company [Member], USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
MidAmerican Energy Company [Member]	'	'
Cash flows from operating activities:	'	'
Net income	$359	$272
Adjustments to reconcile net income to net cash flows from operating activities:	'	'
Depreciation and amortization	258	308
Deferred income taxes and amortization of investment tax credits	-14	42
Changes in other assets and liabilities	35	42
Other, net	-38	-3
Changes in other operating assets and liabilities:	'	'
Receivables, net	31	30
Inventories	34	-6
Derivative collateral, net	-33	6
Pension and other postretirement benefit plans	-2	6
Accounts payable	-30	-7
Taxes accrued	72	-117
Other current assets and liabilities	11	16
Net cash flows from operating activities	683	589
Cash flows from investing activities:	'	'
Utility construction expenditures	-967	-598
Purchases of available-for-sale securities	-69	-80
Proceeds from sales of available-for-sale securities	64	70
Other, net	8	20
Net cash flows from investing activities	-964	-588
Cash flows from financing activities:	'	'
Dividends	0	-125
Proceeds from long-term debt	847	947
Repayments of long-term debt	-356	0
Redemption of preferred securities	0	-28
Other, net	-8	-7
Net cash flows from financing activities	483	787
Net change in cash and cash equivalents	202	788
Cash and cash equivalents at beginning of period	194	354
Cash and cash equivalents at end of period	$396	$1,142

Consolidated_Balance_Sheets_LL

Consolidated Balance Sheets (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	Sep. 30, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
MidAmerican Funding, LLC and Subsidiaries [Domain]	'		'
Utility plant, net:	'		'
Electric	$12,465		$11,936
Gas	1,403		1,365
Gross utility plant in service	13,868		13,301
Accumulated depreciation and amortization	-4,885		-4,710
Utility plant in service, net	8,983		8,591
Construction work in progress	1,150		737
Total utility plant, net	10,133		9,328
Current assets:	'		'
Cash and cash equivalents	397		194
Receivables, net	400		459
Income taxes receivable	0		46
Inventories	195		229
Other	63		65
Total current assets	1,055		993
Other assets:	'		'
Goodwill	1,270		1,270
Regulatory assets	881		748
Investments and nonregulated property, net	634		625
Other	214		203
Total other assets	2,999		2,846
Total assets	14,187	[1]	13,167	[1]
Capitalization:	'		'
MidAmerican Funding member's equity	5,046		4,677
Long-term debt, excluding current portion	4,379		3,527
Total capitalization	9,425		8,204
Current liabilities:	'		'
Current portion of long-term debt	0		350
Note payable to affiliate	138		135
Accounts payable	411		369
Taxes accrued	144		118
Interest accrued	38		44
Other	109		97
Total current liabilities	840		1,113
Other liabilities:	'		'
Deferred income taxes	2,344		2,290
Asset retirement obligations	449		430
Regulatory liabilities	874		875
Other	255		255
Total other liabilities	3,922		3,850
Total capitalization and liabilities	$14,187		$13,167
[1]	(1)Total assets by reportable segment reflect the assignment of goodwill to applicable reporting units.

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
MidAmerican Funding, LLC and Subsidiaries [Domain]	'	'	'	'
Operating revenue:	'	'	'	'
Regulated electric	$539	$512	$1,415	$1,338
Regulated gas	99	98	746	555
Nonregulated	226	218	708	615
Total operating revenue	864	828	2,869	2,508
Regulated operating costs and expenses:	'	'	'	'
Cost of fuel, energy and capacity	139	145	405	382
Cost of gas sold	54	55	546	367
Other operating expenses	119	103	351	320
Maintenance	50	57	171	172
Depreciation and amortization	88	97	258	308
Property and other taxes	31	29	92	89
Total regulated operating costs and expenses	481	486	1,823	1,638
Nonregulated operating costs and expenses:	'	'	'	'
Cost of sales	213	203	648	568
Other	9	9	33	23
Total nonregulated operating costs and expenses	222	212	681	591
Total operating costs and expenses	703	698	2,504	2,229
Operating income	161	130	365	279
Non-operating income:	'	'	'	'
Interest income	0	0	1	1
Allowance for equity funds	11	4	30	12
Other, net	3	5	12	15
Total non-operating income	14	9	43	28
Fixed charges:	'	'	'	'
Interest on long-term debt	50	42	146	123
Other interest expense	0	0	1	1
Allowance for borrowed funds	-4	-1	-12	-4
Total fixed charges	46	41	135	120
Income before income tax (benefit) expense	129	98	273	187
Income tax (benefit) expense	-39	-45	-80	-78
Net income	168	143	353	265
Net income attributable to noncontrolling interests	0	0	0	1
Net income attributable to MidAmerican Funding member	$168	$143	$353	$264

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
MidAmerican Funding, LLC and Subsidiaries [Domain]	'	'	'	'
Net income	$168	$143	$353	$265
Other comprehensive income (loss), net of tax:	'	'	'	'
Unrealized gains on available-for-sale securities, net of tax of $-, $-, $1 and $1	0	1	1	1
Unrealized gains (losses) on cash flow hedges, net of tax of $(6), $-, $10 and $3	-8	-1	15	3
Total other comprehensive income (loss), net of tax	-8	0	16	4
Comprehensive income	160	143	369	269
Comprehensive income attributable to noncontrolling interests	0	0	0	1
Comprehensive income attributable to MidAmerican Funding member	$160	$143	$369	$268

Consolidated_Statements_of_Com1

Consolidated Statements of Comprehensive Income (LLC) (Parenthetical) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
MidAmerican Funding, LLC and Subsidiaries [Domain]	'	'	'	'
Unrealized gains on available-for-sale securities, tax	$0	$0	$1	$1
Unrealized gains (losses) on cash flow hedges, tax	($6)	$0	$10	$3

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Equity (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	MidAmerican Funding, LLC and Subsidiaries [Domain]	MidAmerican Funding, LLC and Subsidiaries [Domain]	MidAmerican Funding, LLC and Subsidiaries [Domain]	MidAmerican Funding, LLC and Subsidiaries [Domain]	MidAmerican Funding, LLC and Subsidiaries [Domain]
In Millions, unless otherwise specified	USD ($)	Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss), Net [Member]	Noncontrolling Interests [Member]
		USD ($)	USD ($)	USD ($)	USD ($)
Balance at Dec. 31, 2012	$4,351	$1,679	$2,669	($24)	$27
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'
Net income	265	'	264	'	1
Other comprehensive income (loss)	4	'	'	4	0
Redemption of preferred securities of subsidiary	-28	'	'	'	-28
Balance at Sep. 30, 2013	4,592	1,679	2,933	-20	0
Balance at Jun. 30, 2013	'	'	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'
Net income	143	'	'	'	'
Other comprehensive income (loss)	0	'	'	'	'
Balance at Sep. 30, 2013	4,592	1,679	'	'	'
Balance at Dec. 31, 2013	4,677	1,679	3,009	-11	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'
Net income	353	'	353	'	'
Other comprehensive income (loss)	16	'	'	16	'
Balance at Sep. 30, 2014	5,046	1,679	3,362	5	0
Balance at Jun. 30, 2014	'	'	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'
Net income	168	'	'	'	'
Other comprehensive income (loss)	-8	'	'	'	'
Balance at Sep. 30, 2014	$5,046	$1,679	'	'	$0

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
MidAmerican Funding, LLC and Subsidiaries [Domain]	'	'
Cash flows from operating activities:	'	'
Net income	$353	$265
Adjustments to reconcile net income to net cash flows from operating activities:	'	'
Depreciation and amortization	258	308
Deferred income taxes and amortization of investment tax credits	-15	42
Changes in other assets and liabilities	35	42
Other, net	-30	-4
Changes in other operating assets and liabilities:	'	'
Receivables, net	33	30
Inventories	34	-6
Derivative collateral, net	-33	6
Pension and other postretirement benefit plans	-2	6
Accounts payable	-30	-7
Taxes accrued	71	-117
Other current assets and liabilities	5	10
Net cash flows from operating activities	679	575
Cash flows from investing activities:	'	'
Utility construction expenditures	-967	-598
Purchases of available-for-sale securities	-69	-80
Proceeds from sales of available-for-sale securities	64	70
Other, net	10	20
Net cash flows from investing activities	-962	-588
Cash flows from financing activities:	'	'
Proceeds from long-term debt	847	947
Repayments of long-term debt	-356	0
Redemption of preferred securities of subsidiary	0	-28
Net change in note payable to affiliate	3	-111
Other, net	-8	-7
Net cash flows from financing activities	486	801
Net change in cash and cash equivalents	203	788
Cash and cash equivalents at beginning of period	194	354
Cash and cash equivalents at end of period	$397	$1,142

General_MEC

General (MEC) (MidAmerican Energy Company [Member])	9 Months Ended
	Sep. 30, 2014
MidAmerican Energy Company [Member]	'
Notes to Financial Statements [Line Items]	'
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	'
	-1	General
	MidAmerican Energy Company ("MidAmerican Energy") is a public utility with electric and natural gas operations and is the principal subsidiary of MHC Inc. ("MHC"). MHC is a holding company that conducts no business other than the ownership of its subsidiaries and related corporate services. MHC's nonregulated subsidiaries include Midwest Capital Group, Inc. and MEC Construction Services Co. MHC is the direct, wholly owned subsidiary of MidAmerican Funding, LLC ("MidAmerican Funding"), which is an Iowa limited liability company with Berkshire Hathaway Energy Company ("BHE") as its sole member. BHE is a consolidated subsidiary of Berkshire Hathaway Inc. ("Berkshire Hathaway").
	The unaudited Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and the United States Securities and Exchange Commission's rules and regulations for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the disclosures required by GAAP for annual financial statements. Management believes the unaudited Financial Statements contain all adjustments (consisting only of normal recurring adjustments) considered necessary for the fair presentation of the unaudited Financial Statements as of September 30, 2014, and for the three- and nine-month periods ended September 30, 2014 and 2013. The results of operations for the three- and nine-month periods ended September 30, 2014, 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, 2013, describes the most significant accounting policies used in the preparation of the unaudited Financial Statements. There have been no significant changes in MidAmerican Energy's assumptions regarding significant accounting estimates and policies during the nine-month period ended September 30, 2014.
	Utility Plant Depreciation Rates
	Effective January 1, 2014, MidAmerican Energy revised depreciation rates for certain electric generating facilities based on the results of its 2013 Iowa electric retail rate case. The new depreciation rates reflect longer estimated useful lives for certain generating facilities. The effect of this change was to reduce depreciation and amortization expense by $50 million annually, or $13 million and $38 million for the three- and nine-month periods ended September 30, 2014, respectively, based on depreciable plant balances at the time of the change. In August 2013, MidAmerican Energy revised its depreciation rates for certain electric generating facilities based on the results of a new depreciation study. The new rates reflect longer estimated useful lives for wind-powered generating facilities placed in service in 2011 and 2012 and a lower accrual rate for the cost of removal regulatory liability related to coal-fueled generating facilities. The effect of this change was to reduce depreciation and amortization expense by $49 million annually, or $13 million and $37 million for the three- and nine-month periods ended September 30, 2014, respectively, based on depreciable plant balances at the time of the change.

New_Accounting_Pronouncements_

New Accounting Pronouncements (MEC) (MidAmerican Energy Company [Member])	9 Months Ended
	Sep. 30, 2014
MidAmerican Energy Company [Member]	'
Notes to Financial Statements [Line Items]	'
Accounting Changes [Text Block]	'
	-2	New Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-09, which creates FASB Accounting Standards Codification ("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. This guidance is effective for interim and annual reporting periods beginning after December 15, 2016. Early application is not permitted. 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.
	In February 2013, the FASB issued ASU No. 2013-04, which amends FASB ASC Topic 405, "Liabilities." The amendments in this guidance require an entity to measure obligations resulting from joint and several liability arrangements for which the total amount of the obligation is fixed at the reporting date as the amount the reporting entity agreed to pay plus any additional amounts the reporting entity expects to pay on behalf of its co-obligor. Additionally, the guidance requires the entity to disclose the nature and amount of the obligation, as well as other information about those obligations. MidAmerican Energy adopted this guidance on January 1, 2014. The adoption of this guidance did not have a material impact on MidAmerican Energy's disclosures included within Notes to Financial Statements.

Components_of_Accumulated_Othe

Components of Accumulated Other Comprehensive Income (Loss), Net (MEC) (MidAmerican Energy Company [Member])	9 Months Ended
	Sep. 30, 2014
MidAmerican Energy Company [Member]	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Components of Accumulated Other Comprehensive Income (Loss), Net [Text Block]	'
	-3	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) Gains			Other
			Available-For-Sale			on Cash Flow			Comprehensive
			Securities			Hedges			Income (Loss), Net
	Balance, December 31, 2012		$	(5	)	$	(19	)	$	(24	)
	Other comprehensive income		1			3			4
	Balance, September 30, 2013		$	(4	)	$	(16	)	$	(20	)
	Balance, December 31, 2013		$	(4	)	$	(7	)	$	(11	)
	Other comprehensive income		1			15			16
	Balance, September 30, 2014		$	(3	)	$	8		$	5
	For information regarding cash flow hedge reclassifications from AOCI to net income in their entirety, refer to Note 7.

Recent_Financing_Transactions_

Recent Financing Transactions (MEC) (MidAmerican Energy Company [Member])	9 Months Ended
	Sep. 30, 2014
MidAmerican Energy Company [Member]	'
Debt Instrument [Line Items]	'
Debt Disclosure [Text Block]	'
	-4	Recent Financing Transactions
	In April 2014, MidAmerican Energy issued $150 million of its 2.40% First Mortgage Bonds due March 2019, $300 million of its 3.50% First Mortgage Bonds due October 2024 and $400 million of its 4.40% First Mortgage Bonds due October 2044. The net proceeds were used for the optional redemption in May 2014 of $350 million of MidAmerican Energy's 4.65% Senior Notes due October 2014 and for general corporate purposes.

Income_Taxes_MEC

Income Taxes (MEC) (MidAmerican Energy Company [Member])	9 Months Ended
	Sep. 30, 2014
MidAmerican Energy Company [Member]	'
Income Taxes [Line Items]	'
Income Tax Disclosure [Text Block]	'
	-5	Income Taxes
	A reconciliation of the federal statutory income tax rate to MidAmerican Energy's effective income tax rate applicable to income before income tax benefit is as follows:
		Three-Month Periods				Nine-Month Periods
		Ended September 30,				Ended September 30,
		2014		2013		2014		2013
	Federal statutory income tax rate	35	%	35	%	35	%	35	%
	Income tax credits	(56	)	(71	)	(56	)	(66	)
	State income tax, net of federal income tax benefit	(3	)	(2	)	—		(2	)
	Effects of ratemaking	(4	)	(5	)	(5	)	(5	)
	Other, net	—		1		—		1
	Effective income tax rate	(28	)%	(42	)%	(26	)%	(37	)%
	Income tax credits relate primarily to production tax credits earned by 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 receipts for income taxes from BHE totaling $150 million and $17 million for the nine-month periods ended September 30, 2014 and 2013, respectively.

Employee_Benefit_Plans_MEC

Employee Benefit Plans (MEC) (MidAmerican Energy Company [Member])	9 Months Ended
	Sep. 30, 2014
MidAmerican Energy Company [Member]	'
Defined Benefit Plan Disclosure [Line Items]	'
Pension and Other Postretirement Benefits Disclosure [Text Block]	'
	-6	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 for the plans of MidAmerican Energy and the aforementioned affiliates included the following components (in millions):
		Three-Month Periods						Nine-Month Periods
		Ended September 30,						Ended September 30,
		2014			2013			2014			2013
	Pension:
	Service cost	$	4		$	4		$	11		$	13
	Interest cost	8			9			26			25
	Expected return on plan assets	(11		)	(12		)	(34		)	(34		)
	Net amortization	—			3			1			8
	Net periodic benefit cost	$	1		$	4		$	4		$	12
	Other postretirement:
	Service cost	$	2		$	2		$	5		$	4
	Interest cost	2			2			7			6
	Expected return on plan assets	(4		)	(3		)	(11		)	(10		)
	Net amortization	(1		)	(1		)	(3		)	(2		)
	Net periodic benefit cost (benefit)	$	(1	)	$	—		$	(2	)	$	(2	)
	Employer contributions to the pension and other postretirement benefit plans are expected to be $8 million and $1 million, respectively, during 2014. As of September 30, 2014, $5 million and $- million of contributions had been made to the pension and other postretirement benefit plans, respectively.

Risk_Management_and_Hedging_Ac

Risk Management and Hedging Activities (MEC) (MidAmerican Energy Company [Member])	9 Months Ended
	Sep. 30, 2014
MidAmerican Energy Company [Member]	'
Derivatives, Fair Value [Line Items]	'
Derivative Instruments and Hedging Activities Disclosure [Text Block]	'
	-7	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. MidAmerican Energy also provides nonregulated retail electricity and natural gas services in competitive markets. 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, monitor, report, manage and mitigate 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.
	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):
		Current			Other			Current			Other			Total
		Assets -			Assets -			Liabilities -			Liabilities -
		Other			Other			Other			Other
	As of September 30, 2014:
	Not designated as hedging contracts(1):
	Commodity assets	$	3		$	1		$	25		$	—		$	29
	Commodity liabilities	(2		)	—			(75		)	(2		)	(79		)
	Total	1			1			(50		)	(2		)	(50		)
	Designated as hedging contracts:
	Commodity assets	14			—			6			5			25
	Commodity liabilities	(5		)	—			(1		)	(9		)	(15		)
	Total	9			—			5			(4		)	10
	Total derivatives	10			1			(45		)	(6		)	(40		)
	Cash collateral receivable	—			—			36			2			38
	Total derivatives - net basis	$	10		$	1		$	(9	)	$	(4	)	$	(2	)
		Current			Other			Current			Other			Total
		Assets -			Assets -			Liabilities -			Liabilities -
		Other			Other			Other			Other
	As of December 31, 2013:
	Not designated as hedging contracts(1):
	Commodity assets	$	3		$	3		$	16		$	1		$	23
	Commodity liabilities	(1		)	(1		)	(32		)	(6		)	(40		)
	Total	2			2			(16		)	(5		)	(17		)
	Designated as hedging contracts:
	Commodity assets	1			—			1			—			2
	Commodity liabilities	(1		)	—			(5		)	(6		)	(12		)
	Total	—			—			(4		)	(6		)	(10		)
	Total derivatives	2			2			(20		)	(11		)	(27		)
	Cash collateral receivable	(2		)	—			1			1			—
	Total derivatives - net basis	$	—		$	2		$	(19	)	$	(10	)	$	(27	)
	-1	MidAmerican Energy's commodity derivatives not designated as hedging contracts are generally included in regulated rates, and as of September 30, 2014 and December 31, 2013, a net regulatory asset of $51 million and $10 million, respectively, was recorded related to the net derivative liability of $50 million and $17 million, respectively.
	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						Nine-Month Periods
		Ended September 30,						Ended September 30,
		2014			2013			2014			2013
	Beginning balance	$	48		$	23		$	10		$	45
	Changes in fair value recognized in net regulatory assets	2			4			64			4
	Net gains (losses) reclassified to operating revenue	3			(1		)	(21		)	2
	Net losses reclassified to cost of gas sold	(2		)	(6		)	(2		)	(31		)
	Ending balance	$	51		$	20		$	51		$	20
	The following table summarizes the pre-tax gains (losses) included on the Statements of Operations associated with MidAmerican Energy's commodity derivative contracts not designated as hedging contracts and not recorded as a net regulatory asset or liability (in millions):
		Three-Month Periods						Nine-Month Periods
		Ended September 30,						Ended September 30,
		2014			2013			2014			2013
	Nonregulated operating revenue	$	2		$	—		$	(6	)	$	1
	Nonregulated cost of sales	(3		)	—			18			—
	Total	$	(1	)	$	—		$	12		$	1
	Designated as Hedging Contracts
	MidAmerican Energy uses commodity derivative contracts accounted for as cash flow hedges to hedge electricity and natural gas commodity prices for delivery to nonregulated customers. The following table reconciles the beginning and ending balances of MidAmerican Energy'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						Nine-Month Periods
		Ended September 30,						Ended September 30,
		2014			2013			2014			2013
	Beginning balance	$	(28	)	$	26		$	11		$	32
	Changes in fair value recognized in OCI	19			1			(60		)	1
	Net (losses) gains reclassified to nonregulated cost of sales	(5		)	(1		)	35			(7		)
	Ending balance	$	(14	)	$	26		$	(14	)	$	26
	Realized gains and losses on hedges and hedge ineffectiveness are recognized in income as nonregulated operating revenue or nonregulated cost of sales depending upon the nature of the item being hedged. For the three- and nine-month periods ended September 30, 2014 and 2013, hedge ineffectiveness was insignificant. As of September 30, 2014, MidAmerican Energy had cash flow hedges with expiration dates extending through December 2018, and $14 million of pre-tax net unrealized gains 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 commodity derivative contracts with fixed price terms that comprise the mark-to-market values as of (in millions):
	Unit of		September 30,		December 31,
	Measure		2014		2013
Electricity purchases	Megawatt hours		11		5
Natural gas purchases	Decatherms		19		21
Credit Risk
MidAmerican Energy extends unsecured credit to other utilities, energy marketing companies, financial institutions and other market participants in conjunction with its wholesale energy supply and marketing activities. Credit risk relates to the risk of loss that might occur as a result of nonperformance by counterparties on their contractual obligations to make or take delivery of electricity, natural gas or other commodities and to make financial settlements of these obligations. Credit risk may be concentrated to the extent that one or more groups of counterparties have similar economic, industry or other characteristics that would cause their ability to meet contractual obligations to be similarly affected by changes in market or other conditions. In addition, credit risk includes not only the risk that a counterparty may default due to circumstances relating directly to it, but also the risk that a counterparty may default due to circumstances involving other market participants that have a direct or indirect relationship with the counterparty.
MidAmerican Energy analyzes the financial condition of each significant wholesale counterparty before entering into any transactions, 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 mitigate exposure to the financial risks of wholesale counterparties, 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. Counterparties may be assessed fees for delayed payments. If required, MidAmerican Energy exercises rights under these arrangements, including calling on the counterparty's credit support arrangement.
MidAmerican Energy also has potential indirect credit exposure to other market participants in the regional transmission organization ("RTO") markets where it actively participates, including the Midcontinent Independent System Operator, Inc. and the PJM Interconnection, L.L.C.
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 September 30, 2014, 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 $33 million and $35 million as of September 30, 2014 and December 31, 2013, respectively, for which MidAmerican Energy had posted collateral of $- million. If all credit-risk-related contingent features for derivative contracts in liability positions had been triggered as of September 30, 2014 and December 31, 2013, MidAmerican Energy would have been required to post $15 million and $24 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.

Fair_Value_Measurements_MEC

Fair Value Measurements (MEC) (MidAmerican Energy Company [Member])	9 Months Ended
	Sep. 30, 2014
MidAmerican Energy Company [Member]	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Fair Value Disclosures [Text Block]	'
	-8	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 September 30, 2014:
	Assets:
	Commodity derivatives		$	—			$	40			$	14			$	(43	)	$	11
	Money market mutual funds(2)		347				—				—				—			347
	Debt securities:
	United States government obligations		136				—				—				—			136
	International government obligations		—				1				—				—			1
	Corporate obligations		—				37				—				—			37
	Municipal obligations		—				2				—				—			2
	Agency, asset and mortgage-backed obligations		—				2				—				—			2
	Auction rate securities		—				—				25				—			25
	Equity securities:
	United States companies		226				—				—				—			226
	International companies		5				—				—				—			5
			$	714			$	82			$	39			$	(43	)	$	792
	Liabilities - commodity derivatives		$	(2	)		$	(72	)		$	(20	)		$	81		$	(13	)
	As of December 31, 2013:
	Assets:
	Commodity derivatives		$	3			$	16			$	6			$	(23	)	$	2
	Money market mutual funds(2)		95				—				—				—			95
	Debt securities:
	United States government obligations		134				—				—				—			134
	International government obligations		—				1				—				—			1
	Corporate obligations		—				36				—				—			36
	Municipal obligations		—				2				—				—			2
	Agency, asset and mortgage-backed obligations		—				2				—				—			2
	Auction rate securities		—				—				23				—			23
	Equity securities:
	United States companies		214				—				—				—			214
	International companies		4				—				—				—			4
			$	450			$	57			$	29			$	(23	)	$	513
	Liabilities - commodity derivatives		$	(1	)		$	(42	)		$	(9	)		$	23		$	(29	)
	-1	Represents netting under master netting arrangements and a net cash collateral receivable of $38 million and $- million as of September 30, 2014 and December 31, 2013, respectively.
	-2	Amounts are included in cash and cash equivalents and investments and nonregulated property, net 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 energy 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 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. 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								Nine-Month Periods
		Ended September 30,								Ended September 30,
		Commodity				Auction Rate				Commodity				Auction Rate Securities
		Derivatives				Securities				Derivatives
	2014:00:00
	Beginning balance	$	(2	)		$	25			$	(3	)		$	23
	Changes included in earnings(1)	3				—				(1		)		—
	Changes in fair value recognized in OCI	—				—				4				2
	Changes in fair value recognized in net regulatory assets	—				—				(1		)		—
	Settlements	(7		)		—				(5		)		—
	Ending balance	$	(6	)		$	25			$	(6	)		$	25
	2013:00:00
	Beginning balance	$	(2	)		$	22			$	—			$	21
	Changes included in earnings(1)	1				—				6				—
	Changes in fair value recognized in OCI	—				1				(5		)		2
	Changes in fair value recognized in net regulatory assets	(1		)		—				1				—
	Settlements	—				—				(4		)		—
	Ending balance	$	(2	)		$	23			$	(2	)		$	23
-1	Changes included in earnings are reported as nonregulated operating revenue on the Statements of Operations. For commodity derivatives held as of September 30, 2014 and 2013, net unrealized gains included in earnings for the three-month periods ended September 30, 2014 and 2013, totaled $1 million and $1 million, respectively, and for the nine-month periods ended September 30, 2014 and 2013, totaled $2 million and $- million, respectively.
MidAmerican Energy's long-term debt is carried at cost on the Financial Statements. The fair value of MidAmerican Energy's long-term debt is a Level 2 fair value measurement and has been estimated based upon quoted market prices, where available, or at the present value of future cash flows discounted at rates consistent with comparable maturities with similar credit risks. The carrying value of MidAmerican Energy's variable-rate long-term debt approximates fair value because of the frequent repricing of these instruments at market rates. The following table presents the carrying value and estimated fair value of MidAmerican Energy's long-term debt (in millions):
	As of September 30, 2014								As of December 31, 2013
	Carrying				Fair				Carrying				Fair
	Value				Value				Value				Value
Long-term debt	$	4,054			$	4,487			$	3,552			$	3,849

Commitments_and_Contingencies_

Commitments and Contingencies (MEC) (MidAmerican Energy Company [Member])	9 Months Ended
	Sep. 30, 2014
MidAmerican Energy Company [Member]	'
Notes to Financial Statements [Line Items]	'
Commitments and Contingencies Disclosure [Text Block]	'
	-9	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.

Segment_Information_MEC

Segment Information (MEC) (MidAmerican Energy Company [Member])	9 Months Ended
	Sep. 30, 2014
MidAmerican Energy Company [Member]	'
Segment Reporting Information [Line Items]	'
Segment Reporting Disclosure [Text Block]	'
	-10	Segment Information
	MidAmerican Energy has identified three reportable segments: regulated electric, regulated gas and nonregulated energy. 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. The nonregulated energy segment derives most of its revenue from nonregulated retail electric and gas activities. Common operating costs, interest income, interest expense and income tax expense are allocated to each segment based on certain factors, which primarily relate to the nature of the cost.
	The following tables provide information on a reportable segment basis (in millions):
		Three-Month Periods						Nine-Month Periods
		Ended September 30,						Ended September 30,
		2014			2013			2014		2013
	Operating revenue:
	Regulated electric	$	539		$	512		$	1,415	$	1,338
	Regulated gas	99			98			746		555
	Nonregulated energy	224			216			695		610
	Total operating revenue	$	862		$	826		$	2,856	$	2,503
	Depreciation and amortization:
	Regulated electric	$	78		$	88		$	229	$	281
	Regulated gas	10			9			29		27
	Total depreciation and amortization	$	88		$	97		$	258	$	308
	Operating income:
	Regulated electric	$	163		$	130		$	294	$	211
	Regulated gas	(6		)	(6		)	49		43
	Nonregulated energy	3			6			21		25
	Total operating income	$	160		$	130		$	364	$	279
		As of
		September 30,			December 31,
		2014			2013
	Total assets:
	Regulated electric	$	11,570		$	10,532
	Regulated gas	1,167			1,206
	Nonregulated energy	158			131
	Total assets	$	12,895		$	11,869

General_LLC

General (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	9 Months Ended
	Sep. 30, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]	'
Notes to Consolidated Financial Statements [Line Items]	'
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	'
	-1	General
	MidAmerican Funding, LLC ("MidAmerican Funding") is an Iowa limited liability company with Berkshire Hathaway Energy Company ("BHE") as its sole member. BHE is a consolidated subsidiary of Berkshire Hathaway Inc. ("Berkshire Hathaway"). MidAmerican Funding's direct, wholly owned subsidiary is MHC Inc. ("MHC"), which constitutes substantially all of MidAmerican Funding's assets, liabilities and business activities except those related to MidAmerican Funding's long-term debt securities. MHC conducts no business other than the ownership of its subsidiaries and related corporate services. MHC's principal subsidiary is MidAmerican Energy Company ("MidAmerican Energy"), a public utility with electric and natural gas operations. Direct, wholly owned nonregulated subsidiaries of MHC are Midwest Capital Group, Inc. and MEC Construction Services Co.
	The unaudited Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and the United States Securities and Exchange Commission's rules and regulations for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the disclosures required by GAAP for annual financial statements. Management believes the unaudited Consolidated Financial Statements contain all adjustments (consisting only of normal recurring adjustments) considered necessary for the fair presentation of the unaudited Consolidated Financial Statements as of September 30, 2014, and for the three- and nine-month periods ended September 30, 2014 and 2013. The results of operations for the three- and nine-month periods ended September 30, 2014, 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, 2013, describes the most significant accounting policies used in the preparation of the unaudited Consolidated Financial Statements. There have been no significant changes in MidAmerican Funding's assumptions regarding significant accounting estimates and policies during the nine-month period ended September 30, 2014.
	Refer to Note 1 of MidAmerican Energy's Notes to Financial Statements.

New_Accounting_Pronouncements_1

New Accounting Pronouncements (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	9 Months Ended
	Sep. 30, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]	'
Notes to Consolidated Financial Statements [Line Items]	'
Accounting Changes [Text Block]	'
	-2	New Accounting Pronouncements
	Refer to Note 2 of MidAmerican Energy's Notes to Financial Statements.

Components_of_Accumulated_Othe1

Components of Accumulated Other Comprehensive Income (Loss), Net (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	9 Months Ended
	Sep. 30, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Components of Accumulated Other Comprehensive Income (Loss), Net [Text Block]	'
	-3	Components of Accumulated Other Comprehensive Income (Loss), Net
	Refer to Note 3 of MidAmerican Energy's Notes to Financial Statements.

Recent_Financing_Transactions_1

Recent Financing Transactions (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	9 Months Ended
	Sep. 30, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]	'
Debt Instrument [Line Items]	'
Debt Disclosure [Text Block]	'
	-4	Recent Financing Transactions
	Refer to Note 4 of MidAmerican Energy's Notes to Financial Statements.

Income_Taxes_LLC

Income Taxes (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	9 Months Ended
	Sep. 30, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]	'
Income Taxes [Line Items]	'
Income Tax Disclosure [Text Block]	'
	-5	Income Taxes
	A reconciliation of the federal statutory income tax rate to MidAmerican Funding's effective income tax rate applicable to income before income tax benefit is as follows:
		Three-Month Periods				Nine-Month Periods
		Ended September 30,				Ended September 30,
		2014		2013		2014		2013
	Federal statutory income tax rate	35	%	35	%	35	%	35	%
	Income tax credits	(58	)	(74	)	(58	)	(70	)
	State income tax, net of federal income tax benefit	(3	)	(2	)	(1	)	(3	)
	Effects of ratemaking	(4	)	(5	)	(5	)	(5	)
	Other, net	—		—		—		1
	Effective income tax rate	(30	)%	(46	)%	(29	)%	(42	)%
	Income tax credits relate primarily to production tax credits earned by 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 receipts for income taxes from BHE totaling $153 million and $22 million for the nine-month periods ended September 30, 2014 and 2013, respectively.

Employee_Benefit_Plans_LLC

Employee Benefit Plans (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	9 Months Ended
	Sep. 30, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]	'
Defined Benefit Plan Disclosure [Line Items]	'
Pension and Other Postretirement Benefits Disclosure [Text Block]	'
	-6	Employee Benefit Plans
	Refer to Note 6 of MidAmerican Energy's Notes to Financial Statements.

Risk_Management_and_Hedging_Ac1

Risk Management and Hedging Activities (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	9 Months Ended
	Sep. 30, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]	'
Derivatives, Fair Value [Line Items]	'
Derivative Instruments and Hedging Activities Disclosure [Text Block]	'
	-7	Risk Management and Hedging Activities
	Refer to Note 7 of MidAmerican Energy's Notes to Financial Statements.

Fair_Value_Measurements_LLC

Fair Value Measurements (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	9 Months Ended
	Sep. 30, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'
Fair Value Disclosures [Text Block]	'
	-8	Fair 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 September 30, 2014				As of December 31, 2013
		Carrying		Fair		Carrying		Fair
		Value		Value		Value		Value
	Long-term debt	$	4,379	$	4,914	$	3,877	$	4,245

Commitments_and_Contingencies_1

Commitments and Contingencies (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	9 Months Ended
	Sep. 30, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]	'
Notes to Consolidated Financial Statements [Line Items]	'
Commitments and Contingencies Disclosure [Text Block]	'
	-9	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.

Segment_Information_LLC

Segment Information (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	9 Months Ended
	Sep. 30, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]	'
Segment Reporting Information [Line Items]	'
Segment Reporting Disclosure [Text Block]	'
	-10	Segment Information
	MidAmerican Funding has identified three reportable segments: regulated electric, regulated gas and nonregulated energy. 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. The nonregulated energy segment derives most of its revenue from nonregulated retail electric and gas activities. 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 nonregulated subsidiaries of MidAmerican Funding not engaged in the energy business and parent company interest expense.
	The following tables provide information on a reportable segment basis (in millions):
		Three-Month Periods						Nine-Month Periods
		Ended September 30,						Ended September 30,
		2014			2013			2014		2013
	Operating revenue:
	Regulated electric	$	539		$	512		$	1,415	$	1,338
	Regulated gas	99			98			746		555
	Nonregulated energy	224			216			695		610
	Other	2			2			13		5
	Total operating revenue	$	864		$	828		$	2,869	$	2,508
	Depreciation and amortization:
	Regulated electric	$	78		$	88		$	229	$	281
	Regulated gas	10			9			29		27
	Total depreciation and amortization	$	88		$	97		$	258	$	308
	Operating income:
	Regulated electric	$	163		$	130		$	294	$	211
	Regulated gas	(6		)	(6		)	49		43
	Nonregulated energy	3			6			21		25
	Other	1			—			1		—
	Total operating income	$	161		$	130		$	365	$	279
		As of
		September 30,			December 31,
		2014			2013
	Total assets(1):
	Regulated electric	$	12,761		$	11,723
	Regulated gas	1,246			1,285
	Nonregulated energy	158			131
	Other	22			28
	Total assets	$	14,187		$	13,167
	-1	Total assets by reportable segment reflect the assignment of goodwill to applicable reporting units.

Components_of_Accumulated_Othe2

Components of Accumulated Other Comprehensive Income (Loss), Net (MEC) (Tables) (MidAmerican Energy Company [Member])	9 Months Ended
	Sep. 30, 2014
MidAmerican Energy Company [Member]	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Components of Accumulated Other Comprehensive Income (Loss), Net [Table Text Block]	'
	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) Gains			Other
		Available-For-Sale			on Cash Flow			Comprehensive
		Securities			Hedges			Income (Loss), Net
	Balance, December 31, 2012	$	(5	)	$	(19	)	$	(24	)
	Other comprehensive income	1			3			4
	Balance, September 30, 2013	$	(4	)	$	(16	)	$	(20	)
	Balance, December 31, 2013	$	(4	)	$	(7	)	$	(11	)
	Other comprehensive income	1			15			16
	Balance, September 30, 2014	$	(3	)	$	8		$	5

Income_Taxes_MEC_Tables

Income Taxes (MEC) (Tables) (MidAmerican Energy Company [Member])	9 Months Ended
	Sep. 30, 2014
MidAmerican Energy Company [Member]	'
Income Taxes [Line Items]	'
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	'
	A reconciliation of the federal statutory income tax rate to MidAmerican Energy's effective income tax rate applicable to income before income tax benefit is as follows:
		Three-Month Periods				Nine-Month Periods
		Ended September 30,				Ended September 30,
		2014		2013		2014		2013
	Federal statutory income tax rate	35	%	35	%	35	%	35	%
	Income tax credits	(56	)	(71	)	(56	)	(66	)
	State income tax, net of federal income tax benefit	(3	)	(2	)	—		(2	)
	Effects of ratemaking	(4	)	(5	)	(5	)	(5	)
	Other, net	—		1		—		1
	Effective income tax rate	(28	)%	(42	)%	(26	)%	(37	)%

Employee_Benefit_Plans_MEC_Tab

Employee Benefit Plans (MEC) (Tables) (MidAmerican Energy Company [Member])	9 Months Ended
	Sep. 30, 2014
MidAmerican Energy Company [Member]	'
Defined Benefit Plan Disclosure [Line Items]	'
Schedule of Defined Benefit Plans Disclosures [Table Text Block]	'
	Net periodic benefit cost for the plans of MidAmerican Energy and the aforementioned affiliates included the following components (in millions):
		Three-Month Periods						Nine-Month Periods
		Ended September 30,						Ended September 30,
		2014			2013			2014			2013
	Pension:
	Service cost	$	4		$	4		$	11		$	13
	Interest cost	8			9			26			25
	Expected return on plan assets	(11		)	(12		)	(34		)	(34		)
	Net amortization	—			3			1			8
	Net periodic benefit cost	$	1		$	4		$	4		$	12
	Other postretirement:
	Service cost	$	2		$	2		$	5		$	4
	Interest cost	2			2			7			6
	Expected return on plan assets	(4		)	(3		)	(11		)	(10		)
	Net amortization	(1		)	(1		)	(3		)	(2		)
	Net periodic benefit cost (benefit)	$	(1	)	$	—		$	(2	)	$	(2	)

Risk_Management_and_Hedging_Ac2

Risk Management and Hedging Activities (MEC) (Tables) (MidAmerican Energy Company [Member])	9 Months Ended
	Sep. 30, 2014
MidAmerican Energy Company [Member]	'
Derivatives, Fair Value [Line Items]	'
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]	'
	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):
		Current			Other			Current			Other			Total
		Assets -			Assets -			Liabilities -			Liabilities -
		Other			Other			Other			Other
	As of September 30, 2014:
	Not designated as hedging contracts(1):
	Commodity assets	$	3		$	1		$	25		$	—		$	29
	Commodity liabilities	(2		)	—			(75		)	(2		)	(79		)
	Total	1			1			(50		)	(2		)	(50		)
	Designated as hedging contracts:
	Commodity assets	14			—			6			5			25
	Commodity liabilities	(5		)	—			(1		)	(9		)	(15		)
	Total	9			—			5			(4		)	10
	Total derivatives	10			1			(45		)	(6		)	(40		)
	Cash collateral receivable	—			—			36			2			38
	Total derivatives - net basis	$	10		$	1		$	(9	)	$	(4	)	$	(2	)
		Current			Other			Current			Other			Total
		Assets -			Assets -			Liabilities -			Liabilities -
		Other			Other			Other			Other
	As of December 31, 2013:
	Not designated as hedging contracts(1):
	Commodity assets	$	3		$	3		$	16		$	1		$	23
	Commodity liabilities	(1		)	(1		)	(32		)	(6		)	(40		)
	Total	2			2			(16		)	(5		)	(17		)
	Designated as hedging contracts:
	Commodity assets	1			—			1			—			2
	Commodity liabilities	(1		)	—			(5		)	(6		)	(12		)
	Total	—			—			(4		)	(6		)	(10		)
	Total derivatives	2			2			(20		)	(11		)	(27		)
	Cash collateral receivable	(2		)	—			1			1			—
	Total derivatives - net basis	$	—		$	2		$	(19	)	$	(10	)	$	(27	)
	-1	MidAmerican Energy's commodity derivatives not designated as hedging contracts are generally included in regulated rates, and as of September 30, 2014 and December 31, 2013, a net regulatory asset of $51 million and $10 million, respectively, was recorded related to the net derivative liability of $50 million and $17 million, respectively.
Schedule of Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Contracts [Table Text Block]	'
	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						Nine-Month Periods
		Ended September 30,						Ended September 30,
		2014			2013			2014			2013
	Beginning balance	$	48		$	23		$	10		$	45
	Changes in fair value recognized in net regulatory assets	2			4			64			4
	Net gains (losses) reclassified to operating revenue	3			(1		)	(21		)	2
	Net losses reclassified to cost of gas sold	(2		)	(6		)	(2		)	(31		)
	Ending balance	$	51		$	20		$	51		$	20
Schedule Of Nonregulated Derivatives Not Designated As Hedging Instruments Gain (Loss) In Statement Of Financial Performance [Table Text Block]	'
	The following table summarizes the pre-tax gains (losses) included on the Statements of Operations associated with MidAmerican Energy's commodity derivative contracts not designated as hedging contracts and not recorded as a net regulatory asset or liability (in millions):
		Three-Month Periods						Nine-Month Periods
		Ended September 30,						Ended September 30,
		2014			2013			2014			2013
	Nonregulated operating revenue	$	2		$	—		$	(6	)	$	1
	Nonregulated cost of sales	(3		)	—			18			—
	Total	$	(1	)	$	—		$	12		$	1
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block]	'
	The following table reconciles the beginning and ending balances of MidAmerican Energy'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						Nine-Month Periods
		Ended September 30,						Ended September 30,
		2014			2013			2014			2013
	Beginning balance	$	(28	)	$	26		$	11		$	32
	Changes in fair value recognized in OCI	19			1			(60		)	1
	Net (losses) gains reclassified to nonregulated cost of sales	(5		)	(1		)	35			(7		)
	Ending balance	$	(14	)	$	26		$	(14	)	$	26
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]	'
	The following table summarizes the net notional amounts of outstanding commodity derivative contracts with fixed price terms that comprise the mark-to-market values as of (in millions):
		Unit of		September 30,		December 31,
		Measure		2014		2013
	Electricity purchases	Megawatt hours		11		5
	Natural gas purchases	Decatherms		19		21

Fair_Value_Measurements_MEC_Fa

Fair Value Measurements (MEC) Fair Value Measurements (MEC) (Tables) (MidAmerican Energy Company [Member])	9 Months Ended
	Sep. 30, 2014
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 [Table Text Block]	'
	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 September 30, 2014:
	Assets:
	Commodity derivatives		$	—			$	40			$	14			$	(43	)	$	11
	Money market mutual funds(2)		347				—				—				—			347
	Debt securities:
	United States government obligations		136				—				—				—			136
	International government obligations		—				1				—				—			1
	Corporate obligations		—				37				—				—			37
	Municipal obligations		—				2				—				—			2
	Agency, asset and mortgage-backed obligations		—				2				—				—			2
	Auction rate securities		—				—				25				—			25
	Equity securities:
	United States companies		226				—				—				—			226
	International companies		5				—				—				—			5
			$	714			$	82			$	39			$	(43	)	$	792
	Liabilities - commodity derivatives		$	(2	)		$	(72	)		$	(20	)		$	81		$	(13	)
	As of December 31, 2013:
	Assets:
	Commodity derivatives		$	3			$	16			$	6			$	(23	)	$	2
	Money market mutual funds(2)		95				—				—				—			95
	Debt securities:
	United States government obligations		134				—				—				—			134
	International government obligations		—				1				—				—			1
	Corporate obligations		—				36				—				—			36
	Municipal obligations		—				2				—				—			2
	Agency, asset and mortgage-backed obligations		—				2				—				—			2
	Auction rate securities		—				—				23				—			23
	Equity securities:
	United States companies		214				—				—				—			214
	International companies		4				—				—				—			4
			$	450			$	57			$	29			$	(23	)	$	513
	Liabilities - commodity derivatives		$	(1	)		$	(42	)		$	(9	)		$	23		$	(29	)
	-1	Represents netting under master netting arrangements and a net cash collateral receivable of $38 million and $- million as of September 30, 2014 and December 31, 2013, respectively.
	-2	Amounts are included in cash and cash equivalents and investments and nonregulated property, net 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 [Table Text Block]	'
	The following table reconciles the beginning and ending balances of MidAmerican Energy's assets and liabilities measured at fair value on a recurring basis using significant Level 3 inputs (in millions):
		Three-Month Periods								Nine-Month Periods
		Ended September 30,								Ended September 30,
		Commodity				Auction Rate				Commodity				Auction Rate Securities
		Derivatives				Securities				Derivatives
	2014:00:00
	Beginning balance	$	(2	)		$	25			$	(3	)		$	23
	Changes included in earnings(1)	3				—				(1		)		—
	Changes in fair value recognized in OCI	—				—				4				2
	Changes in fair value recognized in net regulatory assets	—				—				(1		)		—
	Settlements	(7		)		—				(5		)		—
	Ending balance	$	(6	)		$	25			$	(6	)		$	25
	2013:00:00
	Beginning balance	$	(2	)		$	22			$	—			$	21
	Changes included in earnings(1)	1				—				6				—
	Changes in fair value recognized in OCI	—				1				(5		)		2
	Changes in fair value recognized in net regulatory assets	(1		)		—				1				—
	Settlements	—				—				(4		)		—
	Ending balance	$	(2	)		$	23			$	(2	)		$	23
	-1	Changes included in earnings are reported as nonregulated operating revenue on the Statements of Operations. For commodity derivatives held as of September 30, 2014 and 2013, net unrealized gains included in earnings for the three-month periods ended September 30, 2014 and 2013, totaled $1 million and $1 million, respectively, and for the nine-month periods ended September 30, 2014 and 2013, totaled $2 million and $- million, respectively.
Fair Value, by Balance Sheet Grouping [Table Text Block]	'
	MidAmerican Energy's long-term debt is carried at cost on the Financial Statements. The fair value of MidAmerican Energy's long-term debt is a Level 2 fair value measurement and has been estimated based upon quoted market prices, where available, or at the present value of future cash flows discounted at rates consistent with comparable maturities with similar credit risks. The carrying value of MidAmerican Energy's variable-rate long-term debt approximates fair value because of the frequent repricing of these instruments at market rates. The following table presents the carrying value and estimated fair value of MidAmerican Energy's long-term debt (in millions):
		As of September 30, 2014								As of December 31, 2013
		Carrying				Fair				Carrying				Fair
		Value				Value				Value				Value
	Long-term debt	$	4,054			$	4,487			$	3,552			$	3,849

Segment_Information_MEC_Tables

Segment Information (MEC) (Tables) (MidAmerican Energy Company [Member])	9 Months Ended
	Sep. 30, 2014
MidAmerican Energy Company [Member]	'
Segment Reporting Information [Line Items]	'
Schedule of Segment Reporting Information, by Segment [Table Text Block]	'
	MidAmerican Energy has identified three reportable segments: regulated electric, regulated gas and nonregulated energy. 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. The nonregulated energy segment derives most of its revenue from nonregulated retail electric and gas activities. Common operating costs, interest income, interest expense and income tax expense are allocated to each segment based on certain factors, which primarily relate to the nature of the cost.
	The following tables provide information on a reportable segment basis (in millions):
		Three-Month Periods						Nine-Month Periods
		Ended September 30,						Ended September 30,
		2014			2013			2014		2013
	Operating revenue:
	Regulated electric	$	539		$	512		$	1,415	$	1,338
	Regulated gas	99			98			746		555
	Nonregulated energy	224			216			695		610
	Total operating revenue	$	862		$	826		$	2,856	$	2,503
	Depreciation and amortization:
	Regulated electric	$	78		$	88		$	229	$	281
	Regulated gas	10			9			29		27
	Total depreciation and amortization	$	88		$	97		$	258	$	308
	Operating income:
	Regulated electric	$	163		$	130		$	294	$	211
	Regulated gas	(6		)	(6		)	49		43
	Nonregulated energy	3			6			21		25
	Total operating income	$	160		$	130		$	364	$	279
		As of
		September 30,			December 31,
		2014			2013
	Total assets:
	Regulated electric	$	11,570		$	10,532
	Regulated gas	1,167			1,206
	Nonregulated energy	158			131
	Total assets	$	12,895		$	11,869

Income_Taxes_LLC_Tables

Income Taxes (LLC) (Tables) (MidAmerican Funding, LLC and Subsidiaries [Domain])	9 Months Ended
	Sep. 30, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]	'
Income Taxes [Line Items]	'
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	'
	A reconciliation of the federal statutory income tax rate to MidAmerican Funding's effective income tax rate applicable to income before income tax benefit is as follows:
		Three-Month Periods				Nine-Month Periods
		Ended September 30,				Ended September 30,
		2014		2013		2014		2013
	Federal statutory income tax rate	35	%	35	%	35	%	35	%
	Income tax credits	(58	)	(74	)	(58	)	(70	)
	State income tax, net of federal income tax benefit	(3	)	(2	)	(1	)	(3	)
	Effects of ratemaking	(4	)	(5	)	(5	)	(5	)
	Other, net	—		—		—		1
	Effective income tax rate	(30	)%	(46	)%	(29	)%	(42	)%

Fair_Value_Mearsurements_LLC_T

Fair Value Mearsurements (LLC) (Tables) (MidAmerican Funding, LLC and Subsidiaries [Domain])	9 Months Ended
	Sep. 30, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'
Fair Value, by Balance Sheet Grouping [Table Text Block]	'
	MidAmerican Funding's long-term debt is carried at cost on the Consolidated Financial Statements. The fair value of MidAmerican Funding's long-term debt is a Level 2 fair value measurement and has been estimated based upon quoted market prices, where available, or at the present value of future cash flows discounted at rates consistent with comparable maturities with similar credit risks. The carrying value of MidAmerican Funding's variable-rate long-term debt approximates fair value because of the frequent repricing of these instruments at market rates. The following table presents the carrying value and estimated fair value of MidAmerican Funding's long-term debt (in millions):
		As of September 30, 2014				As of December 31, 2013
		Carrying		Fair		Carrying		Fair
		Value		Value		Value		Value
	Long-term debt	$	4,379	$	4,914	$	3,877	$	4,245

Segment_Information_LLC_Tables

Segment Information (LLC) (Tables) (MidAmerican Funding, LLC and Subsidiaries [Domain])	9 Months Ended
	Sep. 30, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]	'
Segment Reporting Information [Line Items]	'
Schedule of Segment Reporting Information, by Segment [Table Text Block]	'
	MidAmerican Funding has identified three reportable segments: regulated electric, regulated gas and nonregulated energy. 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. The nonregulated energy segment derives most of its revenue from nonregulated retail electric and gas activities. 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 nonregulated subsidiaries of MidAmerican Funding not engaged in the energy business and parent company interest expense.
	The following tables provide information on a reportable segment basis (in millions):
		Three-Month Periods						Nine-Month Periods
		Ended September 30,						Ended September 30,
		2014			2013			2014		2013
	Operating revenue:
	Regulated electric	$	539		$	512		$	1,415	$	1,338
	Regulated gas	99			98			746		555
	Nonregulated energy	224			216			695		610
	Other	2			2			13		5
	Total operating revenue	$	864		$	828		$	2,869	$	2,508
	Depreciation and amortization:
	Regulated electric	$	78		$	88		$	229	$	281
	Regulated gas	10			9			29		27
	Total depreciation and amortization	$	88		$	97		$	258	$	308
	Operating income:
	Regulated electric	$	163		$	130		$	294	$	211
	Regulated gas	(6		)	(6		)	49		43
	Nonregulated energy	3			6			21		25
	Other	1			—			1		—
	Total operating income	$	161		$	130		$	365	$	279
		As of
		September 30,			December 31,
		2014			2013
	Total assets(1):
	Regulated electric	$	12,761		$	11,723
	Regulated gas	1,246			1,285
	Nonregulated energy	158			131
	Other	22			28
	Total assets	$	14,187		$	13,167
	-1	Total assets by reportable segment reflect the assignment of goodwill to applicable reporting units.

General_MEC_Utility_Plant_Depr

General (MEC) Utility Plant Depreciation Rates (Details) (MidAmerican Energy Company [Member], USD $)	3 Months Ended	9 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2014	Dec. 31, 2013
Electricity Generation Plant, Non-Nuclear [Member]	'	'	'
Change in Accounting Estimate [Line Items]	'	'	'
Change in depreciation rates, annual impact on future years	'	'	$49
Change in depreciation rates, impact on current period from prior year change	13	37	'
Service Life [Member]	'	'	'
Change in Accounting Estimate [Line Items]	'	'	'
Change in depreciation rates, impact on period of change	13	38	'
Change in depreciation rates, annual impact on future years	'	$50	'

Components_of_Accumulated_Othe3

Components of Accumulated Other Comprehensive Income (Loss), Net (MEC) (Details) (MidAmerican Energy Company [Member], USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'	'	'	'
Other comprehensive income, unrealized gains on available-for-sales securities	$0	$1	$1	$1
Other comprehensive income, unrealized gains on cash flow hedges	-8	-1	15	3
Other comprehensive income (loss)	-8	0	16	4
Accumulated Other Comprehensive Income (Loss), Net [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'	'	'	'
Beginning Balance, Unrealized Losses on Available-For-Sale Securities	'	'	-4	-5
Beginning Balance, Unrealized (Losses) Gains on Cash Flow Hedges	'	'	-7	-19
Beginning Balance, Accumulated Other Comprehensive Income (Loss), Net	'	'	-11	-24
Other comprehensive income, unrealized gains on available-for-sales securities	'	'	1	1
Other comprehensive income, unrealized gains on cash flow hedges	'	'	15	3
Other comprehensive income (loss)	'	'	16	4
Ending Balance, Unrealized Losses on Available-For-Sale Securities	-3	-4	-3	-4
Ending Balance, Unrealized (Losses) Gains on Cash Flow Hedges	8	-16	8	-16
Ending Balance, Accumulated Other Comprehensive Income (Loss), Net	$5	($20)	$5	($20)

Recent_Financing_Transactions_2

Recent Financing Transactions (MEC) Recent Financing Transactions - Long-term Debt (Details) (MidAmerican Energy Company [Member], MidAmerican Energy Company [Member], USD $)	Apr. 30, 2014	Apr. 30, 2014	Apr. 30, 2014	31-May-14
In Millions, unless otherwise specified	First Mortgage Bonds, 2.40%, Due March 2019 [Member]	First Mortgage Bonds, 3.50%, Due October 2024 [Member]	First Mortgage Bonds, 4.40%, Due October 2044 [Member]	Notes, 4.65% Series, due 2014 [Member]
Debt Instrument [Line Items]	'	'	'	'
Debt Instrument, Face Amount	$150	$300	$400	'
Debt Instrument, Interest Rate, Stated Percentage	2.40%	3.50%	4.40%	4.65%
Debt Instrument, Repurchased Face Amount	'	'	'	$350

Income_Taxes_MEC_Details

Income Taxes (MEC) (Details) (MidAmerican Energy Company [Member], USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]	'	'	'	'
Federal statutory income tax rate	35.00%	35.00%	35.00%	35.00%
Income tax credits	-56.00%	-71.00%	-56.00%	-66.00%
State income tax, net of federal income tax benefit	-3.00%	-2.00%	0.00%	-2.00%
Effects of ratemaking	-4.00%	-5.00%	-5.00%	-5.00%
Other, net	0.00%	1.00%	0.00%	1.00%
Effective income tax rate	-28.00%	-42.00%	-26.00%	-37.00%
Production Tax Credit Carryforwards [Abstract]	'	'	'	'
Years eligible for renewable energy production tax credit	'	'	'10 years	'
Berkshire Hathaway Energy [Member]	'	'	'	'
Related Party Income Tax Receivable (Payable) [Abstract]	'	'	'	'
Related Party Transaction, Cash (Paid) Received for Income Taxes, Net	'	'	150	17

Employee_Benefit_Plans_MEC_Det

Employee Benefit Plans (MEC) (Details) (MidAmerican Energy Company [Member], USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
United States Defined Benefit Pension Plans [Member]	'	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'
Service cost	$4	$4	$11	$13
Interest cost	8	9	26	25
Expected return on plan assets	-11	-12	-34	-34
Net amortization	0	3	1	8
Net periodic benefit cost (benefit)	1	4	4	12
United States Defined Benefit Other Postretirement Plan [Member]	'	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'
Service cost	2	2	5	4
Interest cost	2	2	7	6
Expected return on plan assets	-4	-3	-11	-10
Net amortization	-1	-1	-3	-2
Net periodic benefit cost (benefit)	($1)	$0	($2)	($2)

Employee_Benefit_Plans_MEC_Nar

Employee Benefit Plans (MEC) Narrative (Details) (MidAmerican Energy Company [Member], USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014
United States Defined Benefit Pension Plans [Member]	'
Defined Benefit Plan Disclosure [Line Items]	'
Estimated employer contributions in current fiscal year	$8
Employer contributions in current year	5
United States Defined Benefit Other Postretirement Plan [Member]	'
Defined Benefit Plan Disclosure [Line Items]	'
Estimated employer contributions in current fiscal year	1
Employer contributions in current year	$0

Risk_Management_and_Hedging_Ac3

Risk Management and Hedging Activities (MEC) Balance Sheet Location (Details) (MidAmerican Energy Company [Member], Commodity Contract [Member], USD $)	Sep. 30, 2014		Jun. 30, 2014	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Derivatives, Fair Value [Line Items]	'		'	'		'	'	'
Total derivative assets (liabilities), net	($40)		'	($27)		'	'	'
Cash collateral, net receivable (payable), offset against derivatives	38		'	0		'	'	'
Total derivatives - net of collateral	-2		'	-27		'	'	'
Current Assets - Other [Member]	'		'	'		'	'	'
Derivatives, Fair Value [Line Items]	'		'	'		'	'	'
Total derivative assets (liabilities), net	10		'	2		'	'	'
Cash collateral, net receivable (payable), offset against derivatives	0		'	-2		'	'	'
Total derivatives - net of collateral	10		'	0		'	'	'
Other Assets - Other [Member]	'		'	'		'	'	'
Derivatives, Fair Value [Line Items]	'		'	'		'	'	'
Total derivative assets (liabilities), net	1		'	2		'	'	'
Cash collateral, net receivable (payable), offset against derivatives	0		'	0		'	'	'
Total derivatives - net of collateral	1		'	2		'	'	'
Current Liabilities - Other [Member]	'		'	'		'	'	'
Derivatives, Fair Value [Line Items]	'		'	'		'	'	'
Total derivative assets (liabilities), net	-45		'	-20		'	'	'
Cash collateral, net receivable (payable), offset against derivatives	36		'	1		'	'	'
Total derivatives - net of collateral	-9		'	-19		'	'	'
Other Liabilities - Other [Member]	'		'	'		'	'	'
Derivatives, Fair Value [Line Items]	'		'	'		'	'	'
Total derivative assets (liabilities), net	-6		'	-11		'	'	'
Cash collateral, net receivable (payable), offset against derivatives	2		'	1		'	'	'
Total derivatives - net of collateral	-4		'	-10		'	'	'
Not Designated as Hedging Instrument [Member]	'		'	'		'	'	'
Derivatives, Fair Value [Line Items]	'		'	'		'	'	'
Commodity assets	29	[1]	'	23	[1]	'	'	'
Commodity liabilities	-79	[1]	'	-40	[1]	'	'	'
Total derivative assets (liabilities), net	-50	[1]	'	-17	[1]	'	'	'
Net regulatory asset	51		48	10		20	23	45
Not Designated as Hedging Instrument [Member] | Current Assets - Other [Member]	'		'	'		'	'	'
Derivatives, Fair Value [Line Items]	'		'	'		'	'	'
Commodity assets	3	[1]	'	3	[1]	'	'	'
Commodity liabilities	-2	[1]	'	-1	[1]	'	'	'
Total derivative assets (liabilities), net	1	[1]	'	2	[1]	'	'	'
Not Designated as Hedging Instrument [Member] | Other Assets - Other [Member]	'		'	'		'	'	'
Derivatives, Fair Value [Line Items]	'		'	'		'	'	'
Commodity assets	1	[1]	'	3	[1]	'	'	'
Commodity liabilities	0	[1]	'	-1	[1]	'	'	'
Total derivative assets (liabilities), net	1	[1]	'	2	[1]	'	'	'
Not Designated as Hedging Instrument [Member] | Current Liabilities - Other [Member]	'		'	'		'	'	'
Derivatives, Fair Value [Line Items]	'		'	'		'	'	'
Commodity assets	25	[1]	'	16	[1]	'	'	'
Commodity liabilities	-75	[1]	'	-32	[1]	'	'	'
Total derivative assets (liabilities), net	-50	[1]	'	-16	[1]	'	'	'
Not Designated as Hedging Instrument [Member] | Other Liabilities - Other [Member]	'		'	'		'	'	'
Derivatives, Fair Value [Line Items]	'		'	'		'	'	'
Commodity assets	0	[1]	'	1	[1]	'	'	'
Commodity liabilities	-2	[1]	'	-6	[1]	'	'	'
Total derivative assets (liabilities), net	-2	[1]	'	-5	[1]	'	'	'
Designated as Hedging Instrument [Member]	'		'	'		'	'	'
Derivatives, Fair Value [Line Items]	'		'	'		'	'	'
Commodity assets	25		'	2		'	'	'
Commodity liabilities	-15		'	-12		'	'	'
Total derivative assets (liabilities), net	10		'	-10		'	'	'
Designated as Hedging Instrument [Member] | Current Assets - Other [Member]	'		'	'		'	'	'
Derivatives, Fair Value [Line Items]	'		'	'		'	'	'
Commodity assets	14		'	1		'	'	'
Commodity liabilities	-5		'	-1		'	'	'
Total derivative assets (liabilities), net	9		'	0		'	'	'
Designated as Hedging Instrument [Member] | Other Assets - Other [Member]	'		'	'		'	'	'
Derivatives, Fair Value [Line Items]	'		'	'		'	'	'
Commodity assets	0		'	0		'	'	'
Commodity liabilities	0		'	0		'	'	'
Total derivative assets (liabilities), net	0		'	0		'	'	'
Designated as Hedging Instrument [Member] | Current Liabilities - Other [Member]	'		'	'		'	'	'
Derivatives, Fair Value [Line Items]	'		'	'		'	'	'
Commodity assets	6		'	1		'	'	'
Commodity liabilities	-1		'	-5		'	'	'
Total derivative assets (liabilities), net	5		'	-4		'	'	'
Designated as Hedging Instrument [Member] | Other Liabilities - Other [Member]	'		'	'		'	'	'
Derivatives, Fair Value [Line Items]	'		'	'		'	'	'
Commodity assets	5		'	0		'	'	'
Commodity liabilities	-9		'	-6		'	'	'
Total derivative assets (liabilities), net	($4)		'	($6)		'	'	'
[1]	MidAmerican Energy's commodity derivatives not designated as hedging contracts are generally included in regulated rates, and as of SeptemberB 30, 2014 and DecemberB 31, 2013, a net regulatory asset of $51B million and $10B million, respectively, was recorded related to the net derivative liability of $50B million and $17B million, respectively.

Risk_Management_and_Hedging_Ac4

Risk Management and Hedging Activities (MEC) Not Designated as Hedging Contracts (Details) (MidAmerican Energy Company [Member], Not Designated as Hedging Instrument [Member], Commodity Contract [Member], USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
MidAmerican Energy Company [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contract [Member]	'	'	'	'
Regulatory Assets (Liabilities), Net, Derivatives [Roll Forward]	'	'	'	'
Beginning balance	$48	$23	$10	$45
Changes in fair value recognized in net regulatory assets	2	4	64	4
Net (losses) gains reclassified to operating revenue	3	-1	-21	2
Net gains (losses) reclassified to cost of gas sold	-2	-6	-2	-31
Ending balance	$51	$20	$51	$20

Risk_Management_and_Hedging_Ac5

Risk Management and Hedging Activities (MEC) Not Designated as Hedging Contracts - Nonregulated (Details) (MidAmerican Energy Company [Member], Commodity Contract [Member], Not Designated as Hedging Instrument [Member], USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivative Instruments, Gain (Loss) Recognized in Income, Net	($1)	$0	$12	$1
Nonregulated operating revenue	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivative Instruments, Gain (Loss) Recognized in Income, Net	2	0	-6	1
Nonregulated cost of sales	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivative Instruments, Gain (Loss) Recognized in Income, Net	($3)	$0	$18	$0

Risk_Management_and_Hedging_Ac6

Risk Management and Hedging Activities (MEC) Designated as Hedging Contracts (Details) (MidAmerican Energy Company [Member], Designated as Hedging Instrument [Member], Commodity Contract [Member], USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
MidAmerican Energy Company [Member] | Designated as Hedging Instrument [Member] | Commodity Contract [Member]	'	'	'	'
Accumulated Other Comprehensive (Income) Loss, Net, Derivatives [Roll Forward]	'	'	'	'
Beginning balance	($28)	$26	$11	$32
Changes in fair value recognized in OCI	19	1	-60	1
Net gains (losses) reclassified to nonregulated cost of sales	-5	-1	35	-7
Ending balance	-14	26	-14	26
Cash flow hedge ineffectiveness	'insignificant	'insignificant	'insignificant	'insignificant
Cash flow hedge gain (loss) to be reclassified within twelve months	'	'	$14	'

Risk_Management_and_Hedging_Ac7

Risk Management and Hedging Activities (MEC) Derivative Contract Volumes (Details) (MidAmerican Energy Company [Member], Commodity Contract [Member])	Sep. 30, 2014	Dec. 31, 2013
	MWh	MWh
Electricity purchases (in megawatt hours) [Member]	'	'
Notional Amounts of Outstanding Derivative Positions [Line Items]	'	'
Derivative, Nonmonetary Notional Amount	11,000,000	5,000,000
Natural gas purchases (in decatherms) [Member]	'	'
Notional Amounts of Outstanding Derivative Positions [Line Items]	'	'
Derivative, Nonmonetary Notional Amount	19,000,000	21,000,000

Risk_Management_and_Hedging_Ac8

Risk Management and Hedging Activities (MEC) Collateral and Contingent Features (Details) (MidAmerican Energy Company [Member], Commodity Contract [Member], USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
MidAmerican Energy Company [Member] | Commodity Contract [Member]	'	'
Derivative [Line Items]	'	'
Derivatives, net liability positions with specific credit-risk features, aggregate fair value	$33	$35
Collateral already posted, aggregate fair value	0	0
Additional collateral, aggregate fair value	$15	$24

Fair_Value_Measurements_MEC_De

Fair Value Measurements (MEC) (Details) (MidAmerican Energy Company [Member], USD $)	Sep. 30, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Commodity Contract [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions	$38		$0
Fair Value, Measurements, Recurring [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Assets, Fair Value Disclosure	792		513
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions	38	[1]	0	[1]
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Assets, Fair Value Disclosure	714		450
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Assets, Fair Value Disclosure	82		57
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Assets, Fair Value Disclosure	39		29
Fair Value, Measurements, Recurring [Member] | Commodity Contract [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	11		2
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	-43	[1]	-23	[1]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	-13		-29
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	81	[1]	23	[1]
Fair Value, Measurements, Recurring [Member] | Commodity Contract [Member] | Fair Value, Inputs, Level 1 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
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	-2		-1
Fair Value, Measurements, Recurring [Member] | Commodity Contract [Member] | Fair Value, Inputs, Level 2 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	40		16
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	-72		-42
Fair Value, Measurements, Recurring [Member] | Commodity Contract [Member] | Fair Value, Inputs, Level 3 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	14		6
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	-20		-9
Money market mutual funds [Member] | Fair Value, Measurements, Recurring [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	347	[2]	95	[2]
Money market mutual funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	347	[2]	95	[2]
Money market mutual funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	0	[2]	0	[2]
Money market mutual funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	0	[2]	0	[2]
United States government obligations [Member] | Fair Value, Measurements, Recurring [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	136		134
United States government obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	136		134
United States government obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	0		0
United States government obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	0		0
International government obligations [Member] | Fair Value, Measurements, Recurring [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	1		1
International government obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	0		0
International government obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	1		1
International government obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	0		0
Corporate obligations [Member] | Fair Value, Measurements, Recurring [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	37		36
Corporate obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	0		0
Corporate obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	37		36
Corporate obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	0		0
Municipal obligations [Member] | Fair Value, Measurements, Recurring [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	2		2
Municipal obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	0		0
Municipal obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	2		2
Municipal obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	0		0
Agency, asset and mortgage-backed obligations [Member] | Fair Value, Measurements, Recurring [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	2		2
Agency, asset and mortgage-backed obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	0		0
Agency, asset and mortgage-backed obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	2		2
Agency, asset and mortgage-backed obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	0		0
Auction rate securities [Member] | Fair Value, Measurements, Recurring [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	25		23
Auction rate securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	0		0
Auction rate securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	0		0
Auction rate securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	25		23
United States equity securities [Member] | Fair Value, Measurements, Recurring [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	226		214
United States equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	226		214
United States equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	0		0
United States equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	0		0
International equity securities [Member] | Fair Value, Measurements, Recurring [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	5		4
International equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	5		4
International equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	0		0
International equity securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]	'		'
Assets, Fair Value Disclosure [Abstract]	'		'
Available-for-sale Securities, Fair Value Disclosure	$0		$0
[1]	Represents netting under master netting arrangements and a net cash collateral receivable of $38B million and $-B million as of SeptemberB 30, 2014 and DecemberB 31, 2013, respectively.
[2]	Amounts are included in cash and cash equivalents and investments and nonregulated property, net on the Balance Sheets. The fair value of these money market mutual funds approximates cost.

Fair_Value_Measurements_MEC_Le

Fair Value Measurements (MEC) Level 3 (Details) (MidAmerican Energy Company [Member], USD $)	3 Months Ended				9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Commodity Derivative [Member]	'		'		'		'
Fair Value, Assets and Liabilities, Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Beginning balance	($2)		($2)		($3)		$0
Changes included in earnings	3	[1]	1	[1]	-1	[1]	6	[1]
Changes in fair value recognized in OCI	0		0		4		-5
Changes in fair value recognized in net regulatory assets	0		-1		-1		1
Settlements	-7		0		-5		-4
Ending balance	-6		-2		-6		-2
Net unrealized gains (losses) included in earnings	1		1		2		0
Auction rate securities [Member]	'		'		'		'
Fair Value, Assets and Liabilities, Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Beginning balance	25		22		23		21
Changes included in earnings	0	[1]	0	[1]	0	[1]	0	[1]
Changes in fair value recognized in OCI	0		1		2		2
Changes in fair value recognized in net regulatory assets	0		0		0		0
Settlements	0		0		0		0
Ending balance	$25		$23		$25		$23
[1]	Changes included in earnings are reported as nonregulated operating revenue on the Statements of Operations. For commodity derivatives held as of SeptemberB 30, 2014 and 2013, net unrealized gains included in earnings for the three-month periods ended SeptemberB 30, 2014 and 2013, totaled $1B million and $1B million, respectively, and for the nine-month periods ended SeptemberB 30, 2014 and 2013, totaled $2B million and $-B million, respectively.

Fair_Value_Measurements_MEC_De1

Fair Value Measurements (MEC) Debt (Details) (MidAmerican Energy Company [Member], USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Long-term debt, carrying value	$4,054	$3,552
Long-term debt, fair value	'	3,849
Fair Value, Inputs, Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Long-term debt, fair value	$4,487	'

Segment_Information_MEC_Detail

Segment Information (MEC) (Details) (MidAmerican Energy Company [Member], USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
			ReportableSegments
Segment Reporting Information [Line Items]	'	'	'	'	'
Number of Reportable Segments	'	'	3	'	'
Regulated electric	$539	$512	$1,415	$1,338	'
Regulated gas	99	98	746	555	'
Nonregulated energy	224	216	695	610	'
Total operating revenue	862	826	2,856	2,503	'
Depreciation and amortization	88	97	258	308	'
Total operating income	160	130	364	279	'
Assets	12,895	'	12,895	'	11,869
Regulated electric [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Regulated electric	539	512	1,415	1,338	'
Depreciation and amortization	78	88	229	281	'
Total operating income	163	130	294	211	'
Assets	11,570	'	11,570	'	10,532
Regulated gas [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Regulated gas	99	98	746	555	'
Depreciation and amortization	10	9	29	27	'
Total operating income	-6	-6	49	43	'
Assets	1,167	'	1,167	'	1,206
Nonregulated energy [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Nonregulated energy	224	216	695	610	'
Total operating income	3	6	21	25	'
Assets	$158	'	$158	'	$131

Income_Taxes_LLC_Details

Income Taxes (LLC) (Details) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]	'	'	'	'
Federal statutory income tax rate	35.00%	35.00%	35.00%	35.00%
Income tax credits	-58.00%	-74.00%	-58.00%	-70.00%
State income tax, net of federal income tax benefit	-3.00%	-2.00%	-1.00%	-3.00%
Effects of ratemaking	-4.00%	-5.00%	-5.00%	-5.00%
Other, net	0.00%	0.00%	0.00%	1.00%
Effective income tax rate	-30.00%	-46.00%	-29.00%	-42.00%
Production Tax Credit Carryforwards [Abstract]	'	'	'	'
Years eligible for renewable energy production tax credit	'	'	'10 years	'
Berkshire Hathaway Energy [Member]	'	'	'	'
Related Party Income Tax Receivable (Payable) [Abstract]	'	'	'	'
Related Party Transaction, Cash (Paid) Received for Income Taxes, Net	'	'	153	22

Fair_Value_Measurements_LLC_De

Fair Value Measurements (LLC) Debt (Details) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Long-term debt, carrying value	$4,379	$3,877
Long-term debt, fair value	'	4,245
Fair Value, Inputs, Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Long-term debt, fair value	$4,914	'

Segment_Information_LLC_Detail

Segment Information (LLC) (Details) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	3 Months Ended			9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013	Dec. 31, 2013
				ReportableSegments
Segment Reporting Information [Line Items]	'		'	'		'	'
Number of Reportable Segments	'		'	3		'	'
Regulated electric	$539		$512	$1,415		$1,338	'
Regulated gas	99		98	746		555	'
Nonregulated	226		218	708		615	'
Total operating revenue	864		828	2,869		2,508	'
Depreciation and amortization	88		97	258		308	'
Total operating income	161		130	365		279	'
Assets	14,187	[1]	'	14,187	[1]	'	13,167	[1]
Regulated electric [Member]	'		'	'		'	'
Segment Reporting Information [Line Items]	'		'	'		'	'
Regulated electric	539		512	1,415		1,338	'
Depreciation and amortization	78		88	229		281	'
Total operating income	163		130	294		211	'
Assets	12,761	[1]	'	12,761	[1]	'	11,723	[1]
Regulated gas [Member]	'		'	'		'	'
Segment Reporting Information [Line Items]	'		'	'		'	'
Regulated gas	99		98	746		555	'
Depreciation and amortization	10		9	29		27	'
Total operating income	-6		-6	49		43	'
Assets	1,246	[1]	'	1,246	[1]	'	1,285	[1]
Nonregulated energy [Member]	'		'	'		'	'
Segment Reporting Information [Line Items]	'		'	'		'	'
Nonregulated	224		216	695		610	'
Total operating income	3		6	21		25	'
Assets	158	[1]	'	158	[1]	'	131	[1]
Other [Member]	'		'	'		'	'
Segment Reporting Information [Line Items]	'		'	'		'	'
Nonregulated	2		2	13		5	'
Total operating income	1		0	1		0	'
Assets	$22	[1]	'	$22	[1]	'	$28	[1]
[1]	(1)Total assets by reportable segment reflect the assignment of goodwill to applicable reporting units.