Midamerican Funding 10-K 2 Mar 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document (USD $)	12 Months Ended
	Dec. 31, 2014	Jan. 31, 2015	Jun. 30, 2014
Entity Information [Line Items]
Document Period End Date	31-Dec-14
Document Type	10-K
Document Fiscal Year Focus	2014
Amendment Flag	FALSE
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	No
Entity Public Float			$0
Entity Registrant Name	MIDAMERICAN ENERGY COMPANY
Entity Central Index Key	928576
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		70,980,203
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
MidAmerican Funding, LLC and Subsidiaries [Domain]
Entity Information [Line Items]
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	No
Entity Public Float			$0
Entity Registrant Name	MIDAMERICAN FUNDING, LLC
Entity Central Index Key	1098296
Entity Filer Category	Non-accelerated Filer
Entity Voluntary Filers	Yes
Entity Current Reporting Status	No

Balance_Sheets_MEC

Balance Sheets (MEC) (MidAmerican Energy Company [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
MidAmerican Energy Company [Member]
Utility plant, net:
Electric	$13,426	$11,936
Gas	1,432	1,365
Gross utility plant in service	14,858	13,301
Accumulated depreciation and amortization	-4,954	-4,710
Utility plant in service, net	9,904	8,591
Construction work in progress	606	737
Total utility plant, net	10,510	9,328
Current assets:
Cash and cash equivalents	29	194	354
Receivables, net	433	454
Income taxes receivable	307	50
Inventories	185	229
Other	87	64
Total current assets	1,041	991
Other assets:
Regulatory assets	908	748
Investments and nonregulated property, net	634	598
Other	164	204
Total other assets	1,706	1,550
Total assets	13,257	11,869	11,232
Capitalization:
MidAmerican Energy common shareholder's equity	4,250	3,845
Long-term debt, excluding current portion	3,630	3,202
Total capitalization	7,880	7,047
Current liabilities:
Short-term debt	50	0
Current portion of long-term debt	426	350
Accounts payable	392	368
Taxes accrued	128	118
Interest accrued	40	37
Other	131	97
Total current liabilities	1,167	970
Other liabilities:
Deferred income taxes	2,663	2,294
Asset retirement obligations	432	430
Regulatory liabilities	837	875
Other	278	253
Total other liabilities	4,210	3,852
Total capitalization and liabilities	$13,257	$11,869

Statements_of_Operations_MEC

Statements of Operations (MEC) (MidAmerican Energy Company [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
MidAmerican Energy Company [Member]
Operating revenue:
Regulated electric	$1,817	$1,762	$1,694
Regulated gas	996	824	659
Nonregulated	927	817	889
Total operating revenue	3,740	3,403	3,242
Regulated operating costs and expenses:
Cost of fuel, energy and capacity	532	517	458
Cost of gas sold	720	558	424
Other operating expenses	477	435	427
Maintenance	222	224	220
Depreciation and amortization	351	403	392
Property and other taxes	123	119	115
Total regulated operating costs and expenses	2,425	2,256	2,036
Nonregulated operating costs and expenses:
Cost of sales	863	764	807
Other	30	27	29
Total nonregulated operating costs and expenses	893	791	836
Total operating costs and expenses	3,318	3,047	2,872
Operating income	422	356	370
Non-operating income:
Interest income	1	1	1
Allowance for equity funds	39	19	14
Other, net	9	15	9
Total non-operating income	49	35	24
Fixed charges:
Interest on long-term debt	173	150	142
Other interest expense	1	1	1
Allowance for borrowed funds	-16	-7	-5
Total fixed charges	158	144	138
Income (loss) before income tax benefit	313	247	256
Income tax (benefit) expense	-104	-103	-99
Net income	417	350	355
Preferred dividends	0	1	1
Earnings on common stock	$417	$349	$354

Statements_of_Comprehensive_In

Statements of Comprehensive Income (MEC) (MidAmerican Energy Company [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
MidAmerican Energy Company [Member]
Net income	$417	$350	$355
Other comprehensive income (loss):
Unrealized gains on available-for-sale securities, net of tax of $1, $1 and $2	1	1	3
Unrealized (losses) gains on cash flow hedges, net of tax of $(10), $9 and $4	-13	12	7
Total other comprehensive (loss) income, net of tax	-12	13	10
Comprehensive income	$405	$363	$365

Statements_of_Comprehensive_In1

Statements of Comprehensive Income (MEC) Statements of Comprehensive Income (MEC) (Parenthetical) (MidAmerican Energy Company [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
MidAmerican Energy Company [Member]
Unrealized gains on available-for-sale securities, tax	$1	$1	$2
Unrealized (losses) gains on cash flow hedges, tax	($10)	$9	$4

Statements_of_Changes_in_Equit

Statements of Changes in Equity (MEC) (MidAmerican Energy Company [Member], USD $)	MidAmerican Energy Company [Member]	MidAmerican Energy Company [Member]	MidAmerican Energy Company [Member]	MidAmerican Energy Company [Member]	MidAmerican Energy Company [Member]	MidAmerican Energy Company [Member]
In Millions, unless otherwise specified	USD ($)	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Preferred Securities [Member]	Noncontrolling Interest [Member]
		USD ($)	USD ($)	USD ($)	USD ($)	USD ($)
Balance at Dec. 31, 2011	$3,272	$562	$2,716	($34)	$27	$1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	355		355			0
Other comprehensive income (loss)	10			10		0
Disposition of subsidiary	-1					-1
Preferred dividends	-1		-1
Balance at Dec. 31, 2012	3,635		3,070	-24		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	103
Balance at Mar. 31, 2013
Balance at Dec. 31, 2012	3,635	562	3,070	-24	27	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	350		350			0
Other comprehensive income (loss)	13			13		0
Common dividends	-125		-125
Redemption of preferred securities	-28	-1			-27
Balance at Dec. 31, 2013	3,845	561	3,295	-11	0	0
Balance at Sep. 30, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	78
Balance at Dec. 31, 2013	3,845
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	157
Balance at Mar. 31, 2014
Balance at Dec. 31, 2013	3,845		3,295	-11		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	417		417			0
Other comprehensive income (loss)	-12			-12		0
Balance at Dec. 31, 2014	4,250	561	3,712	-23	0	0
Balance at Sep. 30, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	58
Balance at Dec. 31, 2014	$4,250	$561			$0

Statements_of_Cash_Flows_MEC

Statements of Cash Flows (MEC) (MidAmerican Energy Company [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
MidAmerican Energy Company [Member]
Cash flows from operating activities:
Net income	$417	$350	$355
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	351	403	392
Deferred income taxes and amortization of investment tax credits	300	103	178
Changes in other assets and liabilities	47	57	49
Other, net	-57	-27	-21
Changes in other operating assets and liabilities:
Receivables, net	-3	-58	-14
Inventories	44	13	-40
Derivative collateral, net	-53	5	4
Contributions to pension and other postretirement benefit plans, net	-2	8	-53
Accounts payable	30	23	12
Taxes accrued, net	-252	-164	420
Other current assets and liabilities	1	22	-6
Net cash flows from operating activities	823	735	1,276
Net cash flows from investing activities:
Utility construction expenditures	-1,526	-1,026	-645
Purchases of available-for-sale securities	-88	-114	-64
Proceeds from sales of available-for-sale securities	80	102	45
Proceeds from sales of other investments	8	15	7
Other, net	5	11	18
Net cash flows from investing activities	-1,521	-1,012	-639
Net cash flows from financing activities:
Dividends	0	-125	-1
Proceeds from long-term debt	847	947	0
Repayments of long-term debt	-356	-670	-283
Redemption of preferred securities	0	-28	0
Net proceeds from short-term debt	50	0	0
Other, net	-8	-7	0
Net cash flows from financing activities	533	117	-284
Net change in cash and cash equivalents	-165	-160	353
Cash and cash equivalents at beginning of year	194	354	1
Cash and cash equivalents at end of year	$29	$194	$354

Statements_of_Capitalization_M

Statements of Capitalization (MEC) (MidAmerican Energy Company [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
MidAmerican Energy common shareholder's equity	$4,250	$3,845
Long-term debt, excluding current portion	3,630	3,202
Total capitalization	7,880	7,047
MidAmerican Energy Company [Member]
Long-term debt, excluding current portion	3,630	3,202
Obligations under capital leases	0	0
Unamortized debt discount	-15	-19
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 2.40%, Due 2019 [Member]
Noncurrent debt, face amount	500	350
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.70%, Due 2023 [Member]
Noncurrent debt, face amount	250	250
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.50%, Due 2024 [Member]
Noncurrent debt, face amount	300	0
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 4.80%, Due 2043 [Member]
Noncurrent debt, face amount	350	350
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 4.40%, Due 2044 [Member]
Noncurrent debt, face amount	400	0
MidAmerican Energy Company [Member] | Notes, 5.95% Series, due 2017 [Member]
Noncurrent debt, face amount	250	250
MidAmerican Energy Company [Member] | Notes, 5.3% Series, due 2018 [Member]
Noncurrent debt, face amount	350	350
MidAmerican Energy Company [Member] | Notes, 6.75% Series, due 2031 [Member]
Noncurrent debt, face amount	400	400
MidAmerican Energy Company [Member] | Notes, 5.75% Series, due 2035 [Member]
Noncurrent debt, face amount	300	300
MidAmerican Energy Company [Member] | Notes, 5.8% Series, due 2036 [Member]
Noncurrent debt, face amount	350	350
MidAmerican Energy Company [Member] | Turbine purchase obligation, 1.43%, due 2015 [Member]
Noncurrent debt, face amount	0	426
MidAmerican Energy Company [Member] | Variable-rate tax-exempt obligation series, due 2016 [Member]
Noncurrent debt, face amount	34	34
MidAmerican Energy Company [Member] | Variable-rate tax-exempt obligation series, due 2017 [Member]
Noncurrent debt, face amount	4	4
MidAmerican Energy Company [Member] | Variable-rate tax-exempt obligation series, due 2023, issued in 1993 [Member]
Noncurrent debt, face amount	7	7
MidAmerican Energy Company [Member] | Variable-rate tax-exempt obligation series, due 2023, issued in 2008 [Member]
Noncurrent debt, face amount	57	57
MidAmerican Energy Company [Member] | Variable-rate tax-exempt obligation series, due 2024 [Member]
Noncurrent debt, face amount	35	35
MidAmerican Energy Company [Member] | Variable-rate tax-exempt obligation series, due 2025 [Member]
Noncurrent debt, face amount	13	13
MidAmerican Energy Company [Member] | Variable-rate tax-exempt obligation series, due 2038 [Member]
Noncurrent debt, face amount	45	45
MidAmerican Energy common shareholder's equity [Member]
MidAmerican Energy common shareholder's equity	4,250	3,845
Common Stock [Member]
Common shares, no par; 350,000,000 authorized; 70,980,203 outstanding	561	561
Retained Earnings [Member]
Retained earnings	3,712	3,295
Accumulated Other Comprehensive Income (Loss) [Member]
Unrealized losses on available-for-sale securities, net of tax of $(2) and $(3)	-3	-4
Unrealized losses on cash flow hedges, net of tax of $(14) and $(4)	($20)	($7)

Statements_of_Capitalization_M1

Statements of Capitalization (MEC) Statements of Capitalization (MEC) (Parenthetical) (MidAmerican Energy Company [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, except Share data, unless otherwise specified
MEC First Mortgage Bonds, 2.40%, Due 2019 [Member]
Stated interest rate	2.40%	2.40%
MEC First Mortgage Bonds, 3.70%, Due 2023 [Member]
Stated interest rate	3.70%	3.70%
MEC First Mortgage Bonds, 3.50%, Due 2024 [Member]
Stated interest rate	3.50%
MEC First Mortgage Bonds, 4.80%, Due 2043 [Member]
Stated interest rate	4.80%	4.80%
MEC First Mortgage Bonds, 4.40%, Due 2044 [Member]
Stated interest rate	4.40%
Notes, 5.95% Series, due 2017 [Member]
Stated interest rate	5.95%	5.95%
Notes, 5.3% Series, due 2018 [Member]
Stated interest rate	5.30%	5.30%
Notes, 6.75% Series, due 2031 [Member]
Stated interest rate	6.75%	6.75%
Notes, 5.75% Series, due 2035 [Member]
Stated interest rate	5.75%	5.75%
Notes, 5.8% Series, due 2036 [Member]
Stated interest rate	5.80%	5.80%
Turbine purchase obligation, 1.43%, due 2015 [Member]
Vendor financing, discount rate applied		1.43%
Tax-exempt bond obligations, variable rate, due 2016-2038 [Member]
Weighted average interest rate at period end	0.07%	0.08%
Common Stock [Member]
Common Stock, Par or Stated Value Per Share	0	0
Common Stock, Shares Authorized	350,000,000	350,000,000
Common Stock, Shares, Outstanding	70,980,203	70,980,203
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated other comprehensive income (loss), available-for-sale adjustment, tax	-2	-3
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from cash flow hedges, tax	-14	-4

Consolidated_Balance_Sheets_LL

Consolidated Balance Sheets (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
MidAmerican Funding, LLC and Subsidiaries [Domain]
Utility plant, net:
Electric	$13,426	$11,936
Gas	1,432	1,365
Gross utility plant in service	14,858	13,301
Accumulated depreciation and amortization	-4,954	-4,710
Utility plant in service, net	9,904	8,591
Construction work in progress	606	737
Total utility plant, net	10,510	9,328
Current assets:
Cash and cash equivalents	30	194	354
Receivables, net	437	459
Income taxes receivable	303	46
Inventories	185	229
Other	87	65
Total current assets	1,042	993
Other assets:
Goodwill	1,270	1,270
Regulatory assets	908	748
Investments and nonregulated property, net	651	625
Other	163	203
Total other assets	2,992	2,846
Total assets	14,544	13,167	12,530
Capitalization:
MidAmerican Funding member's equity	5,073	4,677
Long-term debt, excluding current portion	3,955	3,527
Total capitalization	9,028	8,204
Current liabilities:
Short-term debt	50	0
Current portion of long-term debt	426	350
Note payable to affiliate	136	135
Accounts payable	392	369
Taxes accrued	128	118
Interest accrued	48	44
Other	131	97
Total current liabilities	1,311	1,113
Other liabilities:
Deferred income taxes	2,657	2,290
Asset retirement obligations	432	430
Regulatory liabilities	837	875
Other	279	255
Total other liabilities	4,205	3,850
Total capitalization and liabilities	$14,544	$13,167

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
MidAmerican Funding, LLC and Subsidiaries [Domain]
Operating revenue:
Regulated electric	$1,817	$1,762	$1,694
Regulated gas	996	824	659
Nonregulated	949	827	894
Total operating revenue	3,762	3,413	3,247
Regulated operating costs and expenses:
Cost of fuel, energy and capacity	532	517	458
Cost of gas sold	720	558	424
Other operating expenses	477	435	427
Maintenance	222	224	220
Depreciation and amortization	351	403	392
Property and other taxes	123	119	115
Total regulated operating costs and expenses	2,425	2,256	2,036
Nonregulated operating costs and expenses:
Cost of sales	881	764	807
Other	33	36	35
Total nonregulated operating costs and expenses	914	800	842
Total operating costs and expenses	3,339	3,056	2,878
Operating income	423	357	369
Non-operating income:
Interest income	1	1	1
Allowance for equity funds	39	19	14
Other, net	17	21	13
Total non-operating income	57	41	28
Fixed charges:
Interest on long-term debt	196	173	164
Other interest expense	1	1	3
Allowance for borrowed funds	-16	-7	-5
Total fixed charges	181	167	162
Income (loss) before income tax benefit	299	231	235
Income tax (benefit) expense	-110	-110	-108
Net income	409	341	343
Net income attributable to noncontrolling interests	0	1	1
Net income attributable to MidAmerican Funding	$409	$340	$342

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
MidAmerican Funding, LLC and Subsidiaries [Domain]
Net income	$409	$341	$343
Other comprehensive income (loss):
Unrealized gains on available-for-sale securities, net of tax of $1, $1 and $2	1	1	3
Unrealized (losses) gains on cash flow hedges, net of tax of $(10), $9 and $4	-13	12	7
Total other comprehensive (loss) income, net of tax	-12	13	10
Comprehensive income	397	354	353
Comprehensive income attributable to noncontrolling interests	0	1	1
Comprehensive income attributable to MidAmerican Funding	$397	$353	$352

Consolidated_Statements_of_Com1

Consolidated Statements of Comprehensive Income (LLC) Consolidated Statements of Comprehensive Income (LLC) (Parenthetical) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
MidAmerican Funding, LLC and Subsidiaries [Domain]
Unrealized gains on available-for-sale securities, tax	$1	$1	$2
Unrealized (losses) gains on cash flow hedges, tax	($10)	$9	$4

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Equity (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	MidAmerican Funding, LLC and Subsidiaries [Domain]	MidAmerican Funding, LLC and Subsidiaries [Domain]	MidAmerican Funding, LLC and Subsidiaries [Domain]	MidAmerican Funding, LLC and Subsidiaries [Domain]	MidAmerican Funding, LLC and Subsidiaries [Domain]
In Millions, unless otherwise specified	USD ($)	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
		USD ($)	USD ($)	USD ($)	USD ($)
Balance at Dec. 31, 2011	$4,000	$1,679	$2,327	($34)	$28
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	343		342		1
Other comprehensive income (loss)	10			10
Disposition of subsidiary	-1				-1
Distributions to noncontrolling interests	-1				-1
Balance at Dec. 31, 2012	4,351	1,679	2,669	-24	27
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	100
Balance at Mar. 31, 2013
Balance at Dec. 31, 2012	4,351	1,679	2,669	-24	27
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	341		340		1
Other comprehensive income (loss)	13			13
Redemption of preferred securities of subsidiary	-28				-28
Balance at Dec. 31, 2013	4,677	1,679	3,009	-11	0
Balance at Sep. 30, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	76
Balance at Dec. 31, 2013	4,677	1,679
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	155
Balance at Mar. 31, 2014
Balance at Dec. 31, 2013	4,677	1,679	3,009	-11	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	409		409		0
Other comprehensive income (loss)	-12			-12
Other equity transactions	-1		-1
Balance at Dec. 31, 2014	5,073	1,679	3,417	-23	0
Balance at Sep. 30, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	56
Balance at Dec. 31, 2014	$5,073	$1,679

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
MidAmerican Funding, LLC and Subsidiaries [Domain]
Cash flows from operating activities:
Net income	$409	$341	$343
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	351	403	392
Deferred income taxes and amortization of investment tax credits	298	102	175
Changes in other assets and liabilities	47	57	49
Other, net	-49	-29	-22
Changes in other operating assets and liabilities:
Receivables, net	-2	-60	-13
Inventories	44	13	-40
Derivative collateral, net	-53	5	4
Contributions to pension and other postretirement benefit plans, net	-2	8	-53
Accounts payable	30	23	12
Taxes accrued, net	-253	-164	419
Other current assets and liabilities	0	22	-6
Net cash flows from operating activities	820	721	1,260
Net cash flows from investing activities:
Utility construction expenditures	-1,526	-1,026	-645
Purchases of available-for-sale securities	-88	-114	-64
Proceeds from sales of available-for-sale securities	80	102	45
Proceeds from sales of other investments	10	16	8
Other, net	5	10	18
Net cash flows from investing activities	-1,519	-1,012	-638
Net cash flows from financing activities:
Proceeds from long-term debt	847	947	0
Repayments of long-term debt	-356	-670	-283
Redemption of preferred securities of subsidiary	0	-28	0
Net change in note payable to affiliate	1	-111	15
Net proceeds from short-term debt	50	0	0
Other, net	-7	-7	-1
Net cash flows from financing activities	535	131	-269
Net change in cash and cash equivalents	-164	-160	353
Cash and cash equivalents at beginning of year	194	354	1
Cash and cash equivalents at end of year	$30	$194	$354

Consolidated_Statements_of_Cap

Consolidated Statements of Capitalization (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
MidAmerican Funding member's equity	$5,073	$4,677
Long-term debt, excluding current portion	3,955	3,527
Total capitalization	9,028	8,204
MidAmerican Energy Company [Member]
Unamortized debt discount	-15	-19
Total MidAmerican Energy long-term debt	3,630	3,202
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 2.40%, Due 2019 [Member]
Noncurrent debt, face amount	500	350
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.70%, Due 2023 [Member]
Noncurrent debt, face amount	250	250
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.50%, Due 2024 [Member]
Noncurrent debt, face amount	300	0
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 4.80%, Due 2043 [Member]
Noncurrent debt, face amount	350	350
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 4.40%, Due 2044 [Member]
Noncurrent debt, face amount	400	0
MidAmerican Energy Company [Member] | Notes, 5.95% Series, due 2017 [Member]
Noncurrent debt, face amount	250	250
MidAmerican Energy Company [Member] | Notes, 5.3% Series, due 2018 [Member]
Noncurrent debt, face amount	350	350
MidAmerican Energy Company [Member] | Notes, 6.75% Series, due 2031 [Member]
Noncurrent debt, face amount	400	400
MidAmerican Energy Company [Member] | Notes, 5.75% Series, due 2035 [Member]
Noncurrent debt, face amount	300	300
MidAmerican Energy Company [Member] | Notes, 5.8% Series, due 2036 [Member]
Noncurrent debt, face amount	350	350
MidAmerican Energy Company [Member] | Turbine purchase obligation, 1.43%, due 2015 [Member]
Noncurrent debt, face amount	0	426
MidAmerican Energy Company [Member] | Variable-rate tax-exempt obligation series, due 2016 [Member]
Noncurrent debt, face amount	34	34
MidAmerican Energy Company [Member] | Variable-rate tax-exempt obligation series, due 2017 [Member]
Noncurrent debt, face amount	4	4
MidAmerican Energy Company [Member] | Variable-rate tax-exempt obligation series, due 2023, issued in 1993 [Member]
Noncurrent debt, face amount	7	7
MidAmerican Energy Company [Member] | Variable-rate tax-exempt obligation series, due 2023, issued in 2008 [Member]
Noncurrent debt, face amount	57	57
MidAmerican Energy Company [Member] | Variable-rate tax-exempt obligation series, due 2024 [Member]
Noncurrent debt, face amount	35	35
MidAmerican Energy Company [Member] | Variable-rate tax-exempt obligation series, due 2025 [Member]
Noncurrent debt, face amount	13	13
MidAmerican Energy Company [Member] | Variable-rate tax-exempt obligation series, due 2038 [Member]
Noncurrent debt, face amount	45	45
MidAmerican Funding LLC [Member] | Senior secured notes, 6.927%, due 2029 [Member]
MidAmerican Funding secured long-term debt, noncurrent	325	325
MidAmerican Funding member's equity [Member]
MidAmerican Funding member's equity	5,073	4,677
Additional Paid-in Capital [Member]
Paid-in capital	1,679	1,679
Retained Earnings [Member]
Retained earnings	3,417	3,009
Accumulated Other Comprehensive Income (Loss) [Member]
Unrealized losses on available-for-sale securities, net of tax of $(2) and $(3)	-3	-4
Unrealized losses on cash flow hedges, net of tax of $(14) and $(4)	($20)	($7)

Consolidated_Statements_of_Cap1

Consolidated Statements of Capitalization (LLC) Consolidated Statements of Capitalization (LLC) (Parenthetical) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated other comprehensive income (loss), available-for-sale adjustment, tax	($2)	($3)
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from cash flow hedges, tax	($14)	($4)
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 2.40%, Due 2019 [Member]
Stated interest rate	2.40%	2.40%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.70%, Due 2023 [Member]
Stated interest rate	3.70%	3.70%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 3.50%, Due 2024 [Member]
Stated interest rate	3.50%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 4.80%, Due 2043 [Member]
Stated interest rate	4.80%	4.80%
MidAmerican Energy Company [Member] | MEC First Mortgage Bonds, 4.40%, Due 2044 [Member]
Stated interest rate	4.40%
MidAmerican Energy Company [Member] | Tax-exempt bond obligations, variable rate, due 2016-2038 [Member]
Weighted average interest rate at period end	0.07%	0.08%
MidAmerican Energy Company [Member] | Notes, 5.95% Series, due 2017 [Member]
Stated interest rate	5.95%	5.95%
MidAmerican Energy Company [Member] | Notes, 5.3% Series, due 2018 [Member]
Stated interest rate	5.30%	5.30%
MidAmerican Energy Company [Member] | Notes, 6.75% Series, due 2031 [Member]
Stated interest rate	6.75%	6.75%
MidAmerican Energy Company [Member] | Notes, 5.75% Series, due 2035 [Member]
Stated interest rate	5.75%	5.75%
MidAmerican Energy Company [Member] | Notes, 5.8% Series, due 2036 [Member]
Stated interest rate	5.80%	5.80%
MidAmerican Energy Company [Member] | Turbine purchase obligation, 1.43%, due 2015 [Member]
Vendor financing, discount rate applied	0.00%	1.43%
MidAmerican Funding LLC [Member] | MidAmerican Funding senior secured notes, 6.927%, due 2029 [Member]
Stated interest rate	6.93%	6.93%

Company_Organization_MEC

Company Organization (MEC) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Notes to Financial Statements [Line Items]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
	-1	Company Organization
	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").

Summary_of_Significant_Account

Summary of Significant Accounting Policies (MEC) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Notes to Financial Statements [Line Items]
Significant Accounting Policies [Text Block]
	-2	Summary of Significant Accounting Policies
	Use of Estimates in Preparation of Financial Statements
	The preparation of the Financial Statements in conformity with accounting principles generally accepted in the United States of America ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the period. These estimates include, but are not limited to, the effects of regulation; certain assumptions made in accounting for pension and other postretirement benefits; asset retirement obligations ("AROs"); income taxes; unbilled revenue; valuation of certain financial assets and liabilities, including derivative contracts; and accounting for contingencies. Actual results may differ from the estimates used in preparing the Financial Statements.
	Accounting for the Effects of Certain Types of Regulation
	MidAmerican Energy's utility operations are subject to the regulation of the Iowa Utilities Board ("IUB"), the Illinois Commerce Commission ("ICC"), the South Dakota Public Utilities Commission, and the Federal Energy Regulatory Commission ("FERC"). MidAmerican Energy's accounting policies and the accompanying Financial Statements conform to GAAP applicable to rate-regulated enterprises and reflect the effects of the ratemaking process.
	MidAmerican Energy prepares its financial statements in accordance with authoritative guidance for regulated operations, which recognizes the economic effects of regulation. Accordingly, MidAmerican Energy defers the recognition of certain costs or income if it is probable that, through the ratemaking process, there will be a corresponding increase or decrease in future regulated rates. Regulatory assets and liabilities are established to reflect the impacts of these deferrals, which will be recognized in earnings in the periods the corresponding changes in regulated rates occur.
	MidAmerican Energy continually evaluates the applicability of the guidance for regulated operations and whether its regulatory assets and liabilities are probable of inclusion in future regulated rates by considering factors such as a change in the regulator's approach to setting rates from cost-based ratemaking to another form of regulation, other regulatory actions or the impact of competition, that could limit MidAmerican Energy's ability to recover its costs. MidAmerican Energy believes the application of the guidance for regulated operations is appropriate, and its existing regulatory assets and liabilities are probable of inclusion in future regulated rates. The evaluation reflects the current political and regulatory climate at both the federal and state levels. If it becomes no longer probable that the deferred costs or income will be included in future regulated rates, the related regulatory assets and liabilities will be written off to net income, returned to customers or re-established as accumulated other comprehensive income (loss) ("AOCI").
	Fair Value Measurements
	As defined under GAAP, fair value is the price that would be received to sell an asset or paid to transfer a liability between market participants in the principal market or in the most advantageous market when no principal market exists. Adjustments to transaction prices or quoted market prices may be required in illiquid or disorderly markets in order to estimate fair value. Different valuation techniques may be appropriate under the circumstances to determine the value that would be received to sell an asset or paid to transfer a liability in an orderly transaction. Market participants are assumed to be independent, knowledgeable, able and willing to transact an exchange and not under duress. Nonperformance or credit risk is considered in determining fair value. Considerable judgment may be required in interpreting market data used to develop the estimates of fair value. Accordingly, estimates of fair value presented herein are not necessarily indicative of the amounts that could be realized in a current or future market exchange.
	Cash Equivalents and Restricted Cash and Investments
	Cash equivalents consist of funds invested in money market mutual funds, United States Treasury Bills and other investments with a maturity of three months or less when purchased. Cash and cash equivalents exclude amounts where availability is restricted by legal requirements, loan agreements or other contractual provisions. Restricted amounts are included in other current assets and investments and nonregulated property, net on the Balance Sheets.
	Investments
	MidAmerican Energy's management determines the appropriate classification of investments in debt and equity securities at the acquisition date and reevaluates the classification at each balance sheet date. Investments that management does not intend to use or is restricted from using in current operations are presented as noncurrent on the Balance Sheets.
	Available-for-sale securities are carried at fair value with realized gains and losses, as determined on a specific identification basis, recognized in earnings and unrealized gains and losses recognized in AOCI, net of tax. Realized and unrealized gains and losses on securities in a trust related to the decommissioning of the Quad Cities Generating Station Units 1 and 2 ("Quad Cities Station") are recorded as a net regulatory liability because MidAmerican Energy expects to recover costs for these activities through regulated rates. Held-to-maturity securities are carried at amortized cost, reflecting the ability and intent to hold the securities to maturity.
	Investments gains and losses arise when investments are sold (as determined on a specific identification basis) or are other-than-temporarily impaired. If a decline in value of an investment below cost is deemed other than temporary, the cost of the investment is written down to fair value, with a corresponding charge to earnings. Factors considered in judging whether an impairment is other than temporary include: the financial condition, business prospects and creditworthiness of the issuer; the relative amount of the decline; MidAmerican Energy's ability and intent to hold the investment until the fair value recovers; and the length of time that fair value has been less than cost. Impairment losses on equity securities are charged to earnings. With respect to an investment in a debt security, any resulting impairment loss is recognized in earnings if MidAmerican Energy intends to sell, or expects to be required to sell, the debt security before its amortized cost is recovered. If MidAmerican Energy does not expect to ultimately recover the amortized cost basis even if it does not intend to sell the security, the credit loss component is recognized in earnings and any difference between fair value and the amortized cost basis, net of the credit loss, is reflected in other comprehensive income (loss) ("OCI"). For regulated investments, any impairment charge is offset by the establishment of a regulatory asset to the extent recovery in regulated rates is probable.
	Allowance for Doubtful Accounts
	Receivables are stated at the outstanding principal amount, net of an estimated allowance for doubtful accounts. The allowance for doubtful accounts is based on MidAmerican Energy's assessment of the collectibility of amounts owed to it by its customers. This assessment requires judgment regarding the ability of customers to pay or the outcome of any pending disputes. As of December 31, 2014 and 2013, the allowance for doubtful accounts totaled $7 million and $10 million, respectively, and is included in receivables, net on the Balance Sheets.
	Derivatives
	MidAmerican Energy employs a number of different derivative contracts, including forwards, futures, options, swaps and other agreements, to manage price risk for electricity, natural gas and other commodities, and interest rate risk. 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. Derivative balances reflect offsetting permitted under master netting agreements with counterparties and cash collateral paid or received under such agreements. Cash collateral received from or paid to counterparties to secure derivative contract assets or liabilities in excess of amounts offset is included in other current assets on the Balance Sheets.
	Commodity derivatives used in normal business operations that are settled by physical delivery, among other criteria, are eligible for and may be designated as normal purchases or normal sales. Normal purchases or normal sales contracts are not marked to market, and settled amounts are recognized as operating revenue or cost of sales on the Statements of Operations.
	For MidAmerican Energy's derivatives not designated as hedging contracts, the settled amount is generally included in regulated rates. Accordingly, the net unrealized gains and losses associated with interim price movements on contracts that are accounted for as derivatives and probable of inclusion in regulated rates are recorded as regulatory assets and liabilities. For MidAmerican Energy's derivatives not designated as hedging contracts and for which changes in fair value are not recorded as regulatory assets and liabilities, unrealized gains and losses are recognized on the Statements of Operations as nonregulated operating revenue for sales contracts and as nonregulated cost of sales for purchase contracts and electricity and natural gas swap contracts.
	For MidAmerican Energy's derivatives designated as hedging contracts, MidAmerican Energy formally assesses, at inception and thereafter, whether the hedging contract is highly effective in offsetting changes in the hedged item. MidAmerican Energy formally documents hedging activity by transaction type and risk management strategy.
	Changes in the estimated fair value of a derivative contract designated and qualified as a cash flow hedge, to the extent effective, are included on the Statements of Changes in Equity as AOCI, net of tax, until the contract settles and the hedged item is recognized in earnings. MidAmerican Energy discontinues hedge accounting prospectively when it has determined that a derivative contract no longer qualifies as an effective hedge, or when it is no longer probable that the hedged forecasted transaction will occur. When hedge accounting is discontinued because the derivative contract no longer qualifies as an effective hedge, future changes in the estimated fair value of the derivative contract are charged to earnings. Gains and losses related to discontinued hedges that were previously recorded in AOCI will remain in AOCI until the contract settles and the hedged item is recognized in earnings, unless it becomes probable that the hedged forecasted transaction will not occur, at which time associated deferred amounts in AOCI are immediately recognized in earnings.
	Inventories
	Inventories consist mainly of materials and supplies, totaling $101 million and $95 million as of December 31, 2014 and 2013, respectively, coal stocks, totaling $54 million and $109 million as of December 31, 2014 and 2013, respectively, and natural gas in storage, totaling $24 million and $19 million as of December 31, 2014 and 2013, respectively. The cost of materials and supplies, coal stocks and fuel oil is determined using the average cost method. The cost of stored natural gas is determined using the last-in-first-out method. With respect to stored natural gas, the replacement cost would be $41 million and $36 million higher as of December 31, 2014 and 2013, respectively.
	Utility Plant, Net
	General
	Additions to utility plant are recorded at cost. MidAmerican Energy capitalizes all construction-related material, direct labor and contract services, as well as indirect construction costs. Indirect construction costs include debt allowance for funds used during construction ("AFUDC") and equity AFUDC. The cost of additions and betterments are capitalized, while costs incurred that do not improve or extend the useful lives of the related assets are generally expensed. Additionally, MidAmerican Energy has regulatory arrangements in Iowa in which the carrying cost of certain utility plant has been reduced for amounts associated with electric returns on equity exceeding specified thresholds.
	Depreciation and amortization for MidAmerican Energy's utility operations are computed by applying the composite or straight-line method based on either estimated useful lives or mandated recovery periods as prescribed by its various regulatory authorities. Depreciation studies are completed by MidAmerican Energy to determine the appropriate group lives, net salvage and group depreciation rates. These studies are reviewed and rates are ultimately approved by the applicable regulatory commission. Net salvage includes the estimated future residual values of the assets and any estimated removal costs recovered through approved depreciation rates. Estimated removal costs are recorded as either a cost of removal regulatory liability or an ARO liability on the Balance Sheets, depending on whether the obligation meets the requirements of an ARO. As actual removal costs are incurred, the associated liability is reduced.
	During the third quarter of 2012, MidAmerican Energy revised its depreciation rates for certain coal-fueled generation facilities reflecting shorter estimated useful lives. The effect of this change increased depreciation and amortization expense by $5 million in 2012 and $11 million annually based on depreciable plant balances at the time of the change. During the third quarter of 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 $20 million in 2013 and $49 million annually based on depreciable plant balances at the time of the change. 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 based on depreciable plant balances at the time of the change.
	The average depreciation and amortization rates applied to depreciable utility plant for the years ended December 31 were as follows:
		2014		2013		2012
	Electric	2.8	%	3.3	%	3.3	%
	Gas	2.8	%	2.8	%	2.8	%
	Generally, when MidAmerican Energy retires or sells a component of utility plant, it charges the original cost, net of any proceeds from the disposition to accumulated depreciation. Any gain or loss on disposals of nonregulated assets is recorded through earnings.
	Debt and equity AFUDC, which represent the estimated costs of debt and equity funds necessary to finance the construction of its regulated facilities, is capitalized by MidAmerican Energy as a component of utility plant, with offsetting credits to the Statements of Operations. AFUDC is computed based on guidelines set forth by the FERC. After construction is completed, MidAmerican Energy is permitted to earn a return on these costs as a component of the related assets, as well as recover these costs through depreciation expense over the useful lives of the related assets.
	Asset Retirement Obligations
	MidAmerican Energy recognizes AROs when it has a legal obligation to perform decommissioning or removal activities upon retirement of an asset. MidAmerican Energy's AROs are primarily related to decommissioning of the Quad Cities Station and obligations associated with its other generating facilities. The fair value of an ARO liability is recognized in the period in which it is incurred, if a reasonable estimate of fair value can be made, and is added to the carrying amount of the associated asset, which is then depreciated over the remaining useful life of the asset. Subsequent to the initial recognition, the ARO liability is adjusted for any revisions to the original estimate of undiscounted cash flows (with corresponding adjustments to utility plant) and for accretion of the ARO liability due to the passage of time. The difference between the ARO liability, the corresponding ARO asset included in utility plant, net and amounts recovered in rates to satisfy such liabilities is recorded as a regulatory asset or liability.
	Impairment
	MidAmerican Energy evaluates long-lived assets for impairment, including utility plant, when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable or the assets are being held for sale. Upon the occurrence of a triggering event, the asset is reviewed to assess whether the estimated undiscounted cash flows expected from the use of the asset plus the residual value from the ultimate disposal exceeds the carrying value of the asset. If the carrying value exceeds the estimated recoverable amounts, the asset is written down to the estimated fair value. The impacts of regulation are considered when evaluating the carrying value of regulated assets. For all other assets, any resulting impairment loss is reflected on the Statements of Operations.
	Revenue Recognition
	Revenue from electric and natural gas customers is recognized as electricity or natural gas is delivered or services are provided. Revenue recognized includes billed and unbilled amounts. As of December 31, 2014 and 2013, unbilled revenue was $131 million and $145 million, respectively, and is included in receivables, net on the Balance Sheets.
	The determination of revenue from an individual customer is based on a systematic reading of meters and rates. At the end of each month, amounts of energy provided to customers since the date of the last meter reading are estimated, and the corresponding unbilled revenue is recorded. Factors that can impact the estimate of unbilled energy include, but are not limited to, seasonal weather patterns compared to normal, total volumes supplied to the system, line losses, economic impacts and composition of customer classes. Estimates are reversed in the following month and actual revenue is recorded based on subsequent meter readings.
	All of MidAmerican Energy's regulated retail electric and gas sales are subject to energy adjustment clauses. MidAmerican Energy also has costs that are recovered, at least in part, through bill riders, including demand-side management costs. The clauses and riders allow MidAmerican Energy to adjust the amounts charged for electric and gas service as the related costs change. The costs recovered in revenue through use of the adjustment clauses and bill riders are charged to expense in the same year the related revenue is recognized. At any given time, these costs may be over or under collected from customers. The total under collection included in receivables at December 31, 2014 and 2013, was $25 million and $49 million, respectively.
	Sales and Excise Tax
	MidAmerican Energy collects from its customers sales and excise taxes assessed by governmental authorities on transactions with customers and later remits the collected taxes to the appropriate authority. If the obligation to pay a particular tax resides with the customer, MidAmerican Energy reports such taxes collected on a net basis and, accordingly, they do not affect the Statement of Operations. Taxes for which the obligation resides with MidAmerican Energy are reported on a gross basis in operating revenue and operating expenses. The amounts reported on a gross basis are not material.
	Unamortized Debt Premiums, Discounts and Financing Costs
	Premiums, discounts and financing costs incurred for the issuance of long-term debt are amortized over the term of the related financing using the effective interest method.
	Income Taxes
	MidAmerican Funding's and MidAmerican Energy's provisions for income taxes have been computed on a stand-alone basis, and substantially all of their respective currently payable or receivable income taxes are remitted to or received from BHE.
	Deferred income tax assets and liabilities are based on differences between the financial statement and income tax basis of assets and liabilities using estimated income tax rates expected to be in effect for the year in which the differences are expected to reverse. Changes in deferred income tax assets and liabilities that are associated with components of OCI are charged or credited directly to OCI. Changes in deferred income tax assets and liabilities that are associated with income tax benefits and expense for certain property-related basis differences and other various differences that MidAmerican Energy is required to pass on to its customers in Iowa are charged or credited directly to a regulatory asset or liability. As of December 31, 2014 and 2013, these amounts were recognized as a net regulatory asset totaling $730 million and $649 million, respectively, and will be included in regulated rates when the temporary differences reverse. Other changes in deferred income tax assets and liabilities are included as a component of income tax expense. Changes in deferred income tax assets and liabilities attributable to changes in enacted income tax rates are charged or credited to income tax expense or a regulatory asset or liability in the period of enactment. Investment tax credits are generally deferred and amortized over the estimated useful lives of the related properties or as prescribed by various regulatory jurisdictions.
	In determining MidAmerican Funding's and MidAmerican Energy's income taxes, management is required to interpret complex income tax laws and regulations, which includes consideration of regulatory implications imposed by MidAmerican Energy's various regulatory jurisdictions. MidAmerican Funding's and MidAmerican Energy's income tax returns are subject to continuous examinations by federal, state and local tax authorities that may give rise to different interpretations of these complex laws and regulations. Due to the nature of the examination process, it generally takes years before these examinations are completed and these matters are resolved. MidAmerican Funding and MidAmerican Energy recognize the tax benefit from an uncertain tax position only if it is more-likely-than-not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the Consolidated Financial Statements from such a position are measured based on the largest benefit that is more-likely-than-not to be realized upon ultimate settlement. Although the ultimate resolution of their federal, state and local income tax examinations is uncertain, each company believes it has made adequate provisions for its income tax positions. The aggregate amount of any additional income tax liabilities that may result from these examinations, if any, is not expected to have a material impact on its consolidated financial results. MidAmerican Funding's and MidAmerican Energy's unrecognized tax benefits are primarily included in taxes accrued and other long-term liabilities on their respective Consolidated Balance Sheets. Estimated interest and penalties, if any, related to uncertain tax positions are included as a component of income tax expense on the Consolidated Statements of Operations.
	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.

Jointly_Owned_Utility_Faciliti

Jointly Owned Utility Facilities (MEC) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Facilities Disclosure [Text Block]	(3)    Jointly Owned Utility Facilities
	Under joint facility ownership agreements with other utilities, MidAmerican Energy, as a tenant in common, has undivided interests in jointly owned generation and transmission facilities. MidAmerican Energy accounts for its proportionate share of each facility, and each joint owner has provided financing for its share of each facility. Operating costs of each facility are assigned to joint owners based on their percentage of ownership or energy production, depending on the nature of the cost. Operating costs and expenses on the Statements of Operations include MidAmerican Energy's share of the expenses of these facilities.
	The amounts shown in the table below represent MidAmerican Energy's share in each jointly owned facility as of December 31, 2014 (dollars in millions):
						Accumulated		Construction
		Company		Plant in		Depreciation and		Work in
		Share		Service		Amortization		Progress
	Louisa Unit No. 1	88	%	$	747	$	392	$	4
	Quad Cities Unit Nos. 1 & 2(1)	25		656		316		27
	Walter Scott, Jr. Unit No. 3	79.1		561		287		7
	Walter Scott, Jr. Unit No. 4(2)	59.7		446		82		3
	George Neal Unit No. 4	40.6		303		142		—
	Ottumwa Unit No. 1	52		530		171		2
	George Neal Unit No. 3	72		390		141		3
	Transmission facilities(3)	Various		243		81		17
	Total			$	3,876	$	1,612	$	63
	-1	Includes amounts related to nuclear fuel.
	-2	Plant in service and accumulated depreciation and amortization amounts are net of credits applied under Iowa revenue sharing arrangements totaling $320 million and $60 million, respectively.
	-3	Includes 345 and 161 kilovolt transmission lines and substations.

Regulatory_Matters_MEC

Regulatory Matters (MEC) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Regulatory Matters Disclosure [Line Items]
Regulatory Matters [Text Block]	Regulatory Matters
	Regulatory assets represent costs that are expected to be recovered in future regulated rates. MidAmerican Energy's regulatory assets reflected on the Balance Sheets consist of the following as of December 31 (in millions):
		Average
		Remaining Life	2014		2013
	Deferred income taxes, net(1)	24 years	$	730	$	649
	Asset retirement obligations(2)	12 years	62		34
	Employee benefit plans(3)	10 years	42		26
	Unrealized loss on regulated derivative contracts	1 year	38		10
	Other	Various	36		29
	Total		$	908	$	748
	-1	Amounts primarily represent income tax benefits related to state accelerated tax depreciation and certain property-related basis differences that were previously flowed through to customers and will be included in regulated rates when the temporary differences reverse.
	-2	Amount predominantly relates to asset retirement obligations for fossil-fueled and wind-powered generating facilities. Refer to Note 12 for a discussion of asset retirement obligations.
	-3	Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in regulated rates when recognized.
	MidAmerican Energy had regulatory assets not earning a return on investment of $904 million and $743 million as of December 31, 2014 and 2013, respectively.
	Regulatory liabilities represent income to be recognized or amounts to be returned to customers in future periods. MidAmerican Energy's regulatory liabilities reflected on the Balance Sheets consist of the following as of December 31 (in millions):
		Average
		Remaining Life	2014		2013
	Cost of removal accrual(1)	24 years	$	642	$	649
	Asset retirement obligations(2)	23 years	159		140
	Employee benefit plans(3)	10 years	5		55
	Other	Various	31		31
	Total		$	837	$	875
	-1	Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing utility plant in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying cost.
	-2	Amount predominantly represents the excess of nuclear decommission trust assets over the related asset retirement obligation. Refer to Note 12 for a discussion of asset retirement obligations.
	-3	Represents amounts not yet recognized as a component of net periodic benefit cost that are to be returned to customers in future periods when recognized.

Investments_and_Nonregulated_P

Investments and Nonregulated Property, Net (MEC) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Investments and Nonregulated Property, Net [Line Items]
Investments and Nonregulated Property, Net [Text Block]
	-5	Investments and Nonregulated Property, Net
	Investments and nonregulated property, net consists of the following amounts as of December 31 (in millions):
		2014		2013
	Nuclear decommissioning trust	$	424	$	394
	Rabbi trusts	175		172
	Auction rate securities	26		23
	Nonregulated property, net of accumulated depreciation of $5 and $5, respectively	9		9
	Total	$	634	$	598
	MidAmerican Energy has established a trust for the investment of funds for decommissioning the Quad Cities Station. These investments in debt and equity securities are classified as available-for-sale and are reported at fair value. Funds are invested in the trust in accordance with applicable federal and state investment guidelines and are restricted for use as reimbursement for costs of decommissioning the Quad Cities Station, which is currently licensed for operation until December 2032. As of December 31, 2014 and 2013, the fair value of the trust's funds was invested as follows: 56% and 54%, respectively, in domestic common equity securities, 32% and 34%, respectively, in United States government securities, 9% and 9%, respectively, in domestic corporate debt securities and 3% and 3%, respectively, in other securities.
	Rabbi trusts primarily hold corporate-owned life insurance on certain current and former key executives and directors. The Rabbi trusts were established to hold investments used to fund the obligations of various nonqualified executive and director compensation plans and to pay the costs of the trusts. The amount represents the cash surrender value of all of the policies included in the Rabbi trusts, net of amounts borrowed against the cash surrender value. Changes in the cash surrender value of the policies are reflected in non-operating income - other, net on the Statements of Operation.
	MidAmerican Energy has investments in interest bearing auction rate securities with a par value of $35 million as of December 31, 2014 and 2013, and remaining maturities of 3 to 21 years. MidAmerican Energy considers the securities to be temporarily impaired, except for an other-than-temporary impairment of $3 million, after-tax, recorded in 2008, and has recorded unrealized losses on the securities of $3 million and $4 million, after tax, in AOCI as of December 31, 2014 and 2013, respectively. MidAmerican Energy does not intend to sell or expect to be required to sell the securities until the remaining principal investment is collected.
	Nonregulated property includes computer software, land and other assets not recoverable for regulated utility purposes. Depreciable property consists primarily of computer software, which is amortized on a straight-line basis over five years.

Components_of_Accumulated_Othe

Components of Accumulated Other Comprehensive Loss, Net (MEC) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Accumulated Other Comprehensive Loss, Net [Line Items]
Components of Accumulated Other Comprehensive Loss, Net [Text Block]
	-6	Components of Accumulated Other Comprehensive Loss, Net
	The following table shows the change in accumulated other comprehensive loss by each component of other comprehensive income, net of applicable income taxes, for the years ended December 31, 2014 and 2013 (in millions):
			Unrealized			Unrealized			Accumulated
			Losses on			Losses			Other
			Available-For-Sale			on Cash Flow			Comprehensive
			Securities			Hedges			Loss, Net
	Balance, December 31, 2012		$	(5	)	$	(19	)	$	(24	)
	Other comprehensive income		1			12			13
	Balance, December 31, 2013		$	(4	)	$	(7	)	$	(11	)
	Other comprehensive income (loss)		1			(13		)	(12		)
	Balance, December 31, 2014		$	(3	)	$	(20	)	$	(23	)
	For information regarding cash flow hedge reclassifications from AOCI to net income in their entirety for the years ended December 31, 2014, 2013 and 2012, refer to Note 13.

Preferred_Securities_MEC

Preferred Securities (MEC) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Class of Stock [Line Items]
Preferred Stock [Text Block]
	-7	Preferred Securities
	In April 2013, MidAmerican Energy redeemed and canceled all outstanding shares of each series of its preferred securities at the stated redemption prices, which in aggregate totaled $28 million including accrued dividends.

Longterm_Debt_MEC

Long-term Debt (MEC) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Debt Instrument [Line Items]
Long-term Debt [Text Block]
	-8	Long-Term Debt
	The annual repayments of MidAmerican Energy's long-term debt for the years beginning January 1, 2015, and thereafter, excluding unamortized discounts, are as follows (in millions):
	2015		$	426
	2016		34
	2017		254
	2018		350
	2019		500
	2020 and thereafter		2,507
	Refer to MidAmerican Energy's Statements of Capitalization for detail of long-term debt.
	In conjunction with the construction of wind-powered generating facilities in 2012, MidAmerican Energy has accrued in gross utility plant in service amounts for turbine purchases it is not contractually obligated to pay until December 2015. The amount ultimately payable was discounted and recognized upon delivery of the equipment as long-term debt. The discount is being amortized as interest expense over the period until payment is due using the effective interest method. The amount ultimately payable is reflected as a turbine purchase obligation with the applicable discount rate on the Statements of Capitalization.
	MidAmerican Energy issued $850 million of first mortgage bonds in April 2014 pursuant to its indenture dated September 9, 2013, as supplemented and amended. The net proceeds were used for the optional redemption of $350 million of MidAmerican Energy's 4.65% Senior Notes due October 2014, and for general corporate purposes.
	Pursuant to MidAmerican Energy's mortgage dated September 9, 2013, MidAmerican Energy's first mortgage bonds, currently and from time to time outstanding, are secured by a first mortgage lien on substantially all of its electric generating, transmission and distribution property within the State of Iowa, subject to certain exceptions and permitted encumbrances. As of December 31, 2014, MidAmerican Energy's eligible property subject to the lien of the mortgage totaled approximately $12 billion based on original cost. Additionally, MidAmerican Energy's senior notes outstanding are equally and ratably secured with the first mortgage bonds as required by the indentures under which the senior notes were issued.
	MidAmerican Energy's variable rate tax-exempt obligations, including the tax-exempt bonds discussed below, bear interest at rates that are periodically established through remarketing of the bonds in the short-term tax-exempt market. MidAmerican Energy, at its option, may change the mode of interest calculation for these bonds by selecting from among several floating or fixed rate alternatives. The interest rates shown on the Statements of Capitalization are the weighted average interest rates as of December 31, 2014 and 2013. MidAmerican Energy maintains revolving credit facility agreements to provide liquidity for holders of these issues.
	As of December 31, 2014, MidAmerican Energy was in compliance with all of its applicable long-term debt covenants.
	In March 1999, MidAmerican Energy committed to the IUB to use commercially reasonable efforts to maintain an investment grade rating on its long-term debt and to maintain its common equity level above 42% of total capitalization unless circumstances beyond its control result in the common equity level decreasing to below 39% of total capitalization. MidAmerican Energy must seek the approval from the IUB of a reasonable utility capital structure if MidAmerican Energy's common equity level decreases below 42% of total capitalization, unless the decrease is beyond the control of MidAmerican Energy. MidAmerican Energy is also required to seek the approval of the IUB if MidAmerican Energy's equity level decreases to below 39%, even if the decrease is due to circumstances beyond the control of MidAmerican Energy. As of December 31, 2014, MidAmerican Energy's common equity ratio was 51% computed on a basis consistent with its commitment. As a result of its regulatory commitment to maintain its common equity level above certain thresholds, MidAmerican Energy could dividend $1.3 billion as of December 31, 2014, without falling below 42%.

Shortterm_Debt_and_Revolving_C

Short-term Debt and Revolving Credit Facilities (MEC) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Line of Credit Facility [Line Items]
Short-term Debt [Text Block]	(9)    Short-Term Debt and Credit Facilities
	Interim financing of working capital needs and the construction program is obtained from unaffiliated parties through the sale of commercial paper or short-term borrowing from banks. MidAmerican Energy has a $600 million unsecured credit facility expiring in March 2018. The credit facility, which supports MidAmerican Energy's commercial paper program and its variable-rate tax-exempt bond obligations and provides for the issuance of letters of credit, has a variable interest rate based on the London Interbank Offered Rate ("LIBOR") or a base rate, at MidAmerican Energy's option, plus a spread that varies based on MidAmerican Energy's credit ratings for senior unsecured long-term debt securities. In addition, MidAmerican Energy has a $5 million unsecured credit facility, which expires in June 2015 and has a variable interest rate based on LIBOR plus a spread. As of December 31, 2014, the weighted average interest rate on commercial paper borrowings outstanding was 0.35%. The $600 million credit facility requires that MidAmerican Energy's ratio of consolidated debt, including current maturities, to total capitalization not exceed 0.65 to 1.0 as of the last day of any quarter. As of December 31, 2014, MidAmerican Energy was in compliance with the covenants of its credit facilities. MidAmerican Energy has authority from the FERC to issue commercial paper and bank notes aggregating $605 million through June 30, 2016.
	The following table summarizes MidAmerican Energy's availability under its two unsecured revolving credit facilities as of December 31 (in millions):
		2014			2013
	Credit facilities	$	605		$	605
	Less:
	Short-term debt outstanding	(50		)	—
	Variable-rate tax-exempt bond support	(195		)	(195		)
	Net credit facilities	$	360		$	410

Income_Taxes_MEC

Income Taxes (MEC) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Income Tax Disclosure [Line Items]
Income Tax Disclosure [Text Block]
	-10	Income Taxes
	MidAmerican Energy's income tax benefit consists of the following for the years ended December 31 (in millions):
		2014				2013				2012
	Current:
	Federal	$	(401	)		$	(196	)		$	(256	)
	State	(3		)		(10		)		(21		)
		(404		)		(206		)		(277		)
	Deferred:
	Federal	299				101				200
	State	2				3				(20		)
		301				104				180
	Investment tax credits	(1		)		(1		)		(2		)
	Total	$	(104	)		$	(103	)		$	(99	)
	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 for the years ended December 31:
		2014			2013			2012
	Federal statutory income tax rate	35	%		35	%		35	%
	Income tax credits	(59	)		(70	)		(56	)
	State income tax, net of federal income tax benefit	—			(2	)		(10	)
	Income tax method changes	—			—			(6	)
	Effects of ratemaking	(8	)		(3	)		—
	Other, net	(1	)		(2	)		(2	)
	Effective income tax rate	(33	)%		(42	)%		(39	)%
	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.
	MidAmerican Energy's income tax benefit for the year ended December 31, 2012, reflects $16 million of federal income tax benefits recognized in connection with an income tax method change for income tax years prior to 2012 related to repair costs for its regulated utility electric transmission and distribution assets based on guidance published by the Internal Revenue Service.
	The income tax method change results in current deductibility for applicable repair costs, which are capitalized for book purposes. MidAmerican Energy retroactively applied the method changes and deducted amounts related to prior years' costs on the tax return that includes the year of change. State utility rate regulation in Iowa requires that the tax effect of certain temporary differences be flowed through immediately to customers. Therefore, certain deferred amounts that would otherwise have been recognized in income tax expense have been included as changes in regulatory assets in recognition of MidAmerican Energy's ability to recover increased tax expense when such temporary differences reverse. This treatment of such temporary differences impacts income tax expense and effective income tax rates from year to year.
	MidAmerican Energy's net deferred income tax liability consists of the following as of December 31 (in millions):
		2014				2013
	Deferred income tax assets:
	Regulatory liabilities	$	332			$	351
	Employee benefits	68				61
	Derivative contracts	30				9
	Asset retirement obligations	185				172
	Other	58				60
	Total deferred income tax assets	673				653
	Deferred income tax liabilities:
	Depreciable property	(2,945		)		(2,599		)
	Regulatory assets	(366		)		(304		)
	Other	(25		)		(40		)
	Total deferred income tax liabilities	(3,336		)		(2,943		)
	Net deferred income tax liability	$	(2,663	)		$	(2,290	)
	Reflected as:
	Current assets - other	$	—			$	4
	Deferred income taxes	(2,663		)		(2,294		)
		$	(2,663	)		$	(2,290	)
	As of December 31, 2014, MidAmerican Energy has available $20 million of state carryforwards, principally related to $429 million of net operating losses, that expire at various intervals between 2015 and 2033.
	The United States Internal Revenue Service has effectively settled its examination of BHE's income tax returns through December 2009, including components related to MidAmerican Energy. In addition, state jurisdictions have closed their examinations of MidAmerican Energy's income tax returns through at least February 9, 2006, including Iowa and Illinois, which are closed through December 31, 2012, and December 31, 2008, respectively.
	A reconciliation of the beginning and ending balances of MidAmerican Energy's net unrecognized tax benefits is as follows for the years ended December 31 (in millions):
		2014				2013
	Beginning balance	$	29			$	36
	Additions based on tax positions related to the current year	6				10
	Additions for tax positions of prior years	38				3
	Reductions based on tax positions related to the current year	(4		)		(10		)
	Reductions for tax positions of prior years	(40		)		(8		)
	Statute of limitations	(3		)		(2		)
	Ending balance	$	26			$	29
	As of December 31, 2014 and 2013, substantially all of MidAmerican Energy's unrecognized tax benefits of $26 million and $29 million, respectively, if recognized, would have an impact on the effective tax rate. The unrecognized tax benefits relate to tax positions for which ultimate deductibility is highly certain but for which there is uncertainty as to the timing of such deductibility.

Employee_Benefit_Plans_MEC

Employee Benefit Plans (MEC) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Disclosure [Text Block]
	-11	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. Benefit obligations under the plan are based on a cash balance arrangement for salaried employees and most union employees and final average pay formulas for other union employees. MidAmerican Energy also maintains noncontributory, nonqualified defined benefit supplemental executive retirement plans ("SERP") for certain active and retired participants.
	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. Under the plans, a majority of all employees of the participating companies may become eligible for these benefits if they reach retirement age. New employees are not eligible for benefits under the plans. MidAmerican Energy has been allowed to recover accrued pension and other postretirement benefit costs in its electric and gas service rates.
	Net Periodic Benefit Cost
	For purposes of calculating the expected return on pension plan assets, a market-related value is used. The market-related value of plan assets is calculated by spreading the difference between expected and actual investment returns on equity investments over a five-year period beginning after the first year in which they occur.
	MidAmerican Energy bills to and is reimbursed currently for affiliates' share of the net periodic benefit costs from all plans in which such affiliates participate. In 2014, 2013 and 2012, MidAmerican Energy's share of the pension net periodic benefit cost was $1 million, $11 million and $8 million, respectively. MidAmerican Energy's share of the other postretirement net periodic benefit cost (benefit) in 2014, 2013 and 2012 totaled $- million, $(1) million and $(2) million, respectively.
	Net periodic benefit cost for the plans of MidAmerican Energy and the aforementioned affiliates included the following components for the years ended December 31 (in millions):
		Pension											Other Postretirement
		2014				2013				2012			2014				2013			2012
	Service cost	$	14			$	18			$	18		$	6			$	5		$	4
	Interest cost	35				33				37			10				8			8
	Expected return on plan assets	(45		)		(45		)		(45		)	(15		)		(13		)	(13		)
	Net amortization	1				11				4			(3		)		(3		)	(3		)
	Net periodic benefit cost (benefit)	$	5			$	17			$	14		$	(2	)		$	(3	)	$	(4	)
	Funded Status
	The following table is a reconciliation of the fair value of plan assets for the years ended December 31 (in millions):
		Pension								Other Postretirement
		2014				2013				2014			2013
	Plan assets at fair value, beginning of year	$	722			$	643			$	256		$	226
	Employer contributions	7				7				1			1
	Participant contributions	—				—				1			1
	Actual return on plan assets	52				142				13			40
	Benefits paid	(51		)		(70		)		(12		)	(12		)
	Plan assets at fair value, end of year	$	730			$	722			$	259		$	256
	The following table is a reconciliation of the benefit obligations for the years ended December 31 (in millions):
		Pension								Other Postretirement
		2014				2013				2014			2013
	Benefit obligation, beginning of year	$	768			$	846			$	235		$	213
	Service cost	14				18				6			5
	Interest cost	35				33				10			8
	Participant contributions	—				—				1			1
	Actuarial loss (gain)	74				(59		)		9			20
	Benefits paid	(51		)		(70		)		(12		)	(12		)
	Benefit obligation, end of year	$	840			$	768			$	249		$	235
	Accumulated benefit obligation, end of year	$	825			$	751
	The funded status of the plans and the amounts recognized on the Balance Sheets as of December 31 are as follows (in millions):
		Pension								Other Postretirement
		2014				2013				2014			2013
	Plan assets at fair value, end of year	$	730			$	722			$	259		$	256
	Less - Benefit obligation, end of year	840				768				249			235
	Funded status	$	(110	)		$	(46	)		$	10		$	21
	Amounts recognized on the Balance Sheets:
	Other assets	$	12			$	66			$	10		$	21
	Other current liabilities	(8		)		(8		)		—			—
	Other liabilities	(114		)		(104		)		—			—
	Amounts recognized	$	(110	)		$	(46	)		$	10		$	21
	MidAmerican Energy sponsors pension and other postretirement benefit plans on behalf of certain of its affiliates in addition to itself, and therefore, the portion of the funded status of the respective plans that has not yet been recognized in net periodic benefit cost is attributable to multiple entities. Additionally, substantially all of MidAmerican Energy's portion of such amounts is either refundable to or recoverable from its customers and is reflected as regulatory liabilities and regulatory assets.
	The SERP has no plan assets; however, MidAmerican Energy and BHE have Rabbi trusts that hold corporate-owned life insurance and other investments to provide funding for the future cash requirements of the SERP. The cash surrender value of all of the policies included in the Rabbi trusts, net of amounts borrowed against the cash surrender value, plus the fair market value of other Rabbi trust investments, was $156 million and $149 million as of December 31, 2014 and 2013, respectively, of which $103 million and $98 million was held by MidAmerican Energy as of December 31, 2014 and 2013, respectively, with the remainder held by BHE. These assets are not included in the plan assets in the above table, but are reflected in investments and nonregulated property, net on the Balance Sheets.
	Unrecognized Amounts
	The portion of the funded status of the plans not yet recognized in net periodic benefit cost as of December 31 is as follows (in millions):
		Pension								Other Postretirement
		2014				2013				2014			2013
	Net (gain) loss	$	21			$	(44	)		$	49		$	41
	Prior service cost (credit)	3				3				(42		)	(47		)
	Total	$	24			$	(41	)		$	7		$	(6	)
	A reconciliation of the amounts not yet recognized as components of net periodic benefit cost for the years ended December 31, 2014 and 2013 is as follows (in millions):
		Regulatory				Regulatory				Receivables			Total
		Asset				Liability				(Payables)
										with Affiliates
	Pension
	Balance, December 31, 2012	$	110			$	—			$	15		$	125
	Net gain arising during the year	(91		)		(49		)		(15		)	(155		)
	Net amortization	(3		)		(6		)		(2		)	(11		)
Total	(94		)		(55		)		(17		)	(166		)
Balance, December 31, 2013	16				(55		)		(2		)	(41		)
Net loss arising during the year	6				51				9			66
Net amortization	—				(1		)		—			(1		)
Total	6				50				9			65
Balance, December 31, 2014	$	22			$	(5	)		$	7		$	24
	Regulatory				Regulatory				Receivables			Total
	Asset				Liability				(Payables)
									with Affiliates
Other Postretirement
Balance, December 31, 2012	$	11			$	—			$	(13	)	$	(2	)
Net gain arising during the year	(3		)		—				(4		)	(7		)
Net amortization	2				—				1			3
Total	(1		)		—				(3		)	(4		)
Balance, December 31, 2013	10				—				(16		)	(6		)
Net loss arising during the year	8				—				2			10
Net amortization	2				—				1			3
Total	10				—				3			13
Balance, December 31, 2014	$	20			$	—			$	(13	)	$	7
The net loss and prior service cost (credit) that will be amortized in 2015 into net periodic benefit cost are estimated to be as follows (in millions):
	Net				Prior				Total
	Loss				Service
					Cost (Credit)
Pension	$	1			$	1			$	2
Other postretirement	2				(5		)		(3		)
Total	$	3			$	(4	)		$	(1	)
Plan Assumptions
Assumptions used to determine benefit obligations and net periodic benefit cost were as follows:
	Pension									Other Postretirement
	2014			2013			2012			2014		2013			2012
Benefit obligations as of December 31:
Discount rate	4	%		4.75	%		4	%		3.75	%	4.5	%		3.75	%
Rate of compensation increase	2.75	%		3	%		3	%		N/A		N/A			N/A
Net periodic benefit cost for the years ended December 31:
Discount rate	4.75	%		4	%		4.75	%		4.5	%	3.75	%		4.75	%
Expected return on plan assets(1)	7.5	%		7.5	%		7.5	%		7.25	%	7.25	%		7.5	%
Rate of compensation increase	3	%		3	%		3.5	%		N/A		N/A			N/A
-1	Amounts reflected are pre-tax values. Assumed after-tax returns for a taxable, non-union other postretirement plan were 5.37% for 2014, and 5.56% for 2013, and 5.75% for 2012.
In establishing its assumption as to the expected return on plan assets, MidAmerican Energy utilizes the expected asset allocation and return assumptions for each asset class based on historical performance and forward-looking views of the financial markets.
	2014			2013
Assumed healthcare cost trend rates as of December 31:
Healthcare cost trend rate assumed for next year	8	%		8	%
Rate that the cost trend rate gradually declines to	5	%		5	%
Year that the rate reaches the rate it is assumed to remain at	2025			2019
A one percentage-point change in assumed healthcare cost trend rates would have the following effects (in millions):
	One Percentage-Point
	Increase				Decrease
Increase (decrease) in:
Total service and interest cost for the year ended December 31, 2014	$	1			$	—
Other postretirement benefit obligation as of December 31, 2014	5				(4		)
Contributions and Benefit Payments
Employer contributions to the pension and other postretirement benefit plans are expected to be $8 million and $1 million, respectively, during 2015. Funding to MidAmerican Energy's pension benefit plan trust is based upon the actuarially determined costs of the plan and the requirements of the Internal Revenue Code, the Employee Retirement Income Security Act of 1974 and the Pension Protection Act of 2006, as amended. MidAmerican Energy considers contributing additional amounts from time to time in order to achieve certain funding levels specified under the Pension Protection Act of 2006, as amended. MidAmerican Energy's funding policy for its other postretirement benefit plan is to generally contribute amounts consistent with its rate regulatory arrangements.
Net periodic benefit costs assigned to MidAmerican Energy affiliates are reimbursed currently in accordance with its intercompany administrative services agreement. The expected benefit payments to participants in MidAmerican Energy's pension and other postretirement benefit plans for 2015 through 2019 and for the five years thereafter are summarized below (in millions):
	Projected Benefit Payments
	Pension				Other Postretirement
2015	$	54			$	16
2016	58				17
2017	59				19
2018	59				20
2019	60				21
2020-2024	298				109
Plan Assets
Investment Policy and Asset Allocations
MidAmerican Energy's investment policy for its pension and other postretirement benefit plans is to balance risk and return through a diversified portfolio of debt securities, equity securities and other alternative investments. Maturities for debt securities are managed to targets consistent with prudent risk tolerances. The plans retain outside investment advisors to manage plan investments within the parameters outlined by the MidAmerican Energy Pension and Employee Benefits Plans Administrative Committee. The investment portfolio is managed in line with the investment policy with sufficient liquidity to meet near-term benefit payments. The return on assets assumption for each plan is based on a weighted-average of the expected historical performance for the types of assets in which the plans invest.
The target allocations (percentage of plan assets) for MidAmerican Energy's pension and other postretirement benefit plan assets are as follows as of December 31, 2014:
	Pension		Other
			Postretirement
	%		%
Debt securities(1)	20-40		25-45
Equity securities(1)	60-80		50-80
Real estate funds	8-Feb		—
Other	0-5		0-5
-1	For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds are allocated based on the underlying investments in debt and equity securities.
Fair Value Measurements
The following table presents the fair value of plan assets, by major category, for MidAmerican Energy's defined benefit pension plan (in millions):
	Input Levels for Fair Value Measurements(1)
	Level 1				Level 2				Level 3			Total
As of December 31, 2014
Cash equivalents	$	—			$	24			$	—		$	24
Debt securities:
United States government obligations	8				—				—			8
Corporate obligations	—				29				—			29
Municipal obligations	—				4				—			4
Agency, asset and mortgage-backed obligations	—				33				—			33
Equity securities:
United States companies	149				—				—			149
International equity securities	40				—				—			40
Investment funds(2)	84				319				—			403
Real estate funds	—				—				40			40
Total	$	281			$	409			$	40		$	730
As of December 31, 2013
Cash equivalents	$	—			$	10			$	—		$	10
Debt securities:
United States government obligations	10				—				—			10
Corporate obligations	—				30				—			30
Municipal obligations	—				5				—			5
Agency, asset and mortgage-backed obligations	—				31				—			31
Equity securities:
United States companies	163				—				—			163
International equity securities	52				—				—			52
Investment funds(2)	105				285				—			390
Real estate funds	—				—				31			31
Total	$	330			$	361			$	31		$	722
-1	Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy.
-2	Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 68% and 32%, respectively, for 2014 and 78% and 22%, respectively, for 2013. Additionally, these funds are invested in United States and international securities of approximately 74% and 26%, respectively, for 2014 and 80% and 20%, respectively, for 2013.
The following table presents the fair value of plan assets, by major category, for MidAmerican Energy's defined benefit other postretirement plans (in millions):
	Input Levels for Fair Value Measurements(1)
	Level 1				Level 2				Level 3			Total
As of December 31, 2014
Cash equivalents	$	4			$	—			$	—		$	4
Debt securities:
United States government obligations	5				—				—			5
Corporate obligations	—				11				—			11
Municipal obligations	—				40				—			40
Agency, asset and mortgage-backed obligations	—				15				—			15
Equity securities:
United States companies	128				—				—			128
Investment funds(2)	56				—				—			56
Total	$	193			$	66			$	—		$	259
As of December 31, 2013
Cash equivalents	$	1			$	—			$	—		$	1
Debt securities:
United States government obligations	7				—				—			7
Corporate obligations	—				9				—			9
Municipal obligations	—				37				—			37
Agency, asset and mortgage-backed obligations	—				13				—			13
Equity securities:
United States companies	125				—				—			125
Investment funds(2)	64				—				—			64
Total	$	197			$	59			$	—		$	256
-1	Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy.
-2	Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 69% and 31%, respectively, for 2014 and 86% and 14%, respectively, for 2013. Additionally, these funds are invested in United States and international securities of approximately 31% and 69%, respectively, for 2014 and 43% and 57%, respectively, for 2013.
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. When observable market data is not available, the fair value is determined using unobservable inputs, such as estimated future cash flows, purchase multiples paid in other comparable third-party transactions or other information. The real estate funds determine fair value of their underlying assets using independent appraisals given there is no current liquid market for the underlying assets. The following table reconciles the beginning and ending balances of MidAmerican Energy's pension plan assets measured at fair value using significant Level 3 inputs for the years ended December 31, (in millions):
	Real Estate Funds
	2014				2013				2012
Beginning balance	$	31			$	26			$	24
Actual return on plan assets still held at period end	4				5				2
Purchases and sales	5				—				—
Ending balance	$	40			$	31			$	26
MidAmerican Energy sponsors a defined contribution plan ("401(k) plan") covering substantially all employees. MidAmerican Energy's contributions are based primarily on each participant's level of contribution and cannot exceed the maximum allowable for tax purposes. Certain participants now receive enhanced benefits in the 401(k) plan and no longer accrue benefits in the noncontributory defined benefit pension plans. MidAmerican Energy's contributions to the plan were $19 million, $17 million, and $16 million for the years ended December 31, 2014, 2013 and 2012, respectively.

Asset_Retirement_Obligations_M

Asset Retirement Obligations (MEC) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Asset Retirement Obligations Disclosure [Line Items]
Asset Retirement Obligation Disclosure [Text Block]
	-12	Asset Retirement Obligations
	MidAmerican Energy estimates its ARO liabilities based upon detailed engineering calculations of the amount and timing of the future cash spending for a third party to perform the required work. Spending estimates are escalated for inflation and then discounted at a credit-adjusted, risk-free rate. Changes in estimates could occur for a number of reasons, including changes in laws and regulations, plan revisions, inflation and changes in the amount and timing of the expected work.
	MidAmerican Energy does not recognize liabilities for AROs for which the fair value cannot be reasonably estimated. Due to the indeterminate removal date, the fair value of the associated liabilities on certain generation, transmission, distribution and other assets cannot currently be estimated, and no amounts are recognized on the Financial Statements other than those included in the cost of removal regulatory liability established via approved depreciation rates in accordance with accepted regulatory practices. These accruals totaled $642 million and $649 million as of December 31, 2014 and 2013, respectively.
	The following table presents MidAmerican Energy's ARO liabilities by asset type as of December 31, (in millions):
		2014			2013
	Quad Cities Station	$	265		$	254
	Fossil-fueled generating facilities	132			127
	Wind-powered generating facilities	60			45
	Other	3			4
	Total asset retirement obligations	$	460		$	430
	Quad Cities Station nuclear decommissioning trust funds(1)	$	424		$	394
	-1	Refer to Note 5 for a discussion of the Quad Cities Station nuclear decommissioning trust funds.
	The following table reconciles the beginning and ending balances of MidAmerican Energy's ARO liabilities for the years ended December 31, (in millions):
		2014			2013
	Beginning balance	$	430		$	318
	Change in estimated costs	(2		)	88
	Additions	11			5
	Accretion	21			19
	Ending balance	$	460		$	430
	Reflected as:
	Other current liabilities	$	28		$	—
	Asset retirement obligations	432			430
		$	460		$	430
	The 2013 change in estimated costs is primarily due to an increase of $98 million in ARO liabilities as a result of changes in the amount and timing of cash flows for ash pond closures at certain MidAmerican Energy fossil-fueled generating facilities.

Risk_Management_and_Hedging_Ac

Risk Management and Hedging Activities (MEC) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments and Hedging Activities Disclosure [Text Block]	(13)    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 Notes 2 and 14 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
		Assets			Assets			Liabilities			Liabilities
		- Other			- Other			- Other			- Other			Total
	As of December 31, 2014
	Not designated as hedging contracts(1):
	Commodity assets	$	14		$	3		$	19		$	1		$	37
	Commodity liabilities	—			—			(69		)	(4		)	(73		)
	Total	14			3			(50		)	(3		)	(36		)
	Designated as hedging contracts:
	Commodity assets	—			—			4			2			6
	Commodity liabilities	—			—			(27		)	(17		)	(44		)
	Total	—			—			(23		)	(15		)	(38		)
	Total derivatives	14			3			(73		)	(18		)	(74		)
	Cash collateral receivable	—			—			42			5			47
	Total derivatives - net basis	$	14		$	3		$	(31	)	$	(13	)	$	(27	)
	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. Accordingly, as of December 31, 2014 and 2013, a net regulatory asset of $38 million and $10 million, respectively, was recorded related to the net derivative liability of $36 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 for the years ended December 31 (in millions):
		2014			2013			2012
	Beginning balance	$	10		$	45		$	73
	Changes in fair value recognized in net regulatory assets	61			5			14
	Net (losses) gains reclassified to operating revenue	(28		)	(1		)	21
	Net (losses) gains reclassified to cost of fuel, energy and capacity	(1		)	(1		)	2
	Net losses reclassified to cost of gas sold	(4		)	(38		)	(65		)
	Ending balance	$	38		$	10		$	45
	The following table summarizes the pre-tax unrealized gains (losses) included on the Statements of Operations associated with MidAmerican Energy's derivative contracts not designated as hedging contracts and not recorded as a net regulatory asset or liability for the years ended December 31 (in millions):
		2014			2013			2012
	Nonregulated operating revenue	$	6		$	—		$	8
	Nonregulated cost of sales	9			(2		)	(4		)
	Total	$	15		$	(2	)	$	4
	Designated as Hedging Contracts
	MidAmerican Energy uses 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 loss (pre-tax) and summarizes pre-tax gains and losses on derivative contracts designated and qualifying as cash flow hedges recognized in OCI, as well as amounts reclassified to earnings, for the years ended December 31 (in millions):
		2014			2013			2012
	Beginning balance	$	11		$	32		$	43
	Changes in fair value recognized in OCI	(3		)	(11		)	27
	Net losses reclassified to nonregulated cost of sales	26			(10		)	(38		)
	Ending balance	$	34		$	11		$	32
	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 years ended December 31, 2014, 2013 and 2012, hedge ineffectiveness was a pre-tax loss of $2 million, $- million and $- million, respectively. As of December 31, 2014, MidAmerican Energy had cash flow hedges with expiration dates extending through December 2018, and $23 million of pre-tax net unrealized losses are forecasted to be reclassified from AOCI into earnings over the next twelve months as contracts settle.
	Derivative Contract Volumes
	The following table summarizes the net notional amounts of outstanding derivative contracts with fixed price terms that comprise the mark-to-market values as of December 31 (in millions):
		Unit of
		Measure		2014		2013
	Electricity purchases	Megawatt hours		14		5
	Natural gas purchases	Decatherms		19		21
	Credit Risk
	MidAmerican Energy is exposed to counterparty credit risk associated with wholesale energy supply and marketing activities with other utilities, energy marketing companies, financial institutions and other market participants. Additionally, MidAmerican Energy participates in the regional transmission organization ("RTO") markets and has indirect credit exposure related to other participants, although RTO credit policies are designed to limit exposure to credit losses from individual participants. Credit risk may be concentrated to the extent MidAmerican Energy's counterparties have similar economic, industry or other characteristics and due to direct or indirect relationships among the counterparties. Before entering into a transaction, MidAmerican Energy analyzes the financial condition of each significant wholesale counterparty, establishes limits on the amount of unsecured credit to be extended to each counterparty, and evaluates the appropriateness of unsecured credit limits on an ongoing basis. To further mitigate wholesale counterparty credit risk, MidAmerican Energy enters into netting and collateral arrangements that may include margining and cross-product netting agreements and obtains third-party guarantees, letters of credit and cash deposits. If required, MidAmerican Energy exercises rights under these arrangements, including calling on the counterparty's credit support arrangement.
Collateral and Contingent Features
In accordance with industry practice, certain wholesale derivative contracts contain credit support provisions that in part base MidAmerican Energy's collateral requirements on its credit ratings for senior unsecured debt as reported by one or more of the three recognized credit rating agencies. These derivative contracts may either specifically provide bilateral rights to demand cash or other security if credit exposures on a net basis exceed specified rating-dependent threshold levels ("credit-risk-related contingent features") or provide the right for counterparties to demand "adequate assurance," or in some cases terminate the contract, in the event of a material adverse change in MidAmerican Energy's creditworthiness. These rights can vary by contract and by counterparty. As of December 31, 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 $52 million and $35 million as of December 31, 2014 and 2013, respectively, for which MidAmerican Energy had posted collateral of $- million at each date. If all credit-risk-related contingent features for derivative contracts in liability positions had been triggered as of December 31, 2014 and 2013, MidAmerican Energy would have been required to post $36 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])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Disclosures [Text Block]
	-14	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 December 31, 2014:
	Assets:
	Commodity derivatives		$	1			$	18			$	24			$	(26	)	$	17
	Money market mutual funds(2)		1				—				—				—			1
	Debt securities:
	United States government obligations		136				—				—				—			136
	International government obligations		—				1				—				—			1
	Corporate obligations		—				39				—				—			39
	Municipal obligations		—				2				—				—			2
	Agency, asset and mortgage-backed obligations		—				2				—				—			2
	Auction rate securities		—				—				26				—			26
	Equity securities:
	United States companies		238				—				—				—			238
	International companies		5				—				—				—			5
			$	381			$	62			$	50			$	(26	)	$	467
	Liabilities - commodity derivatives		$	(18	)		$	(87	)		$	(12	)		$	73		$	(44	)
	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 $47 million and $- million as of December 31, 2014 and 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 13 for further discussion regarding MidAmerican Energy's risk management and hedging activities.
	MidAmerican Energy's investments in money market mutual funds and debt and equity securities are stated at fair value and are accounted for as available-for-sale securities. When available, a readily observable quoted market price or net asset value of an identical security in an active market is used to record the fair value. In the absence of a quoted market price or net asset value of an identical security, the fair value is determined using pricing models or net asset values based on observable market inputs and quoted market prices of securities with similar characteristics. The fair value of MidAmerican Energy's investments in auction rate securities, where there is no current liquid market, is determined using pricing models based on available observable market data and MidAmerican Energy's judgment about the assumptions, including liquidity and nonperformance risks, which market participants would use when pricing the asset.
	The following table reconciles the beginning and ending balances of MidAmerican Energy's assets measured at fair value on a recurring basis using significant Level 3 inputs for the years ended December 31 (in millions):
			Commodity Derivatives												Auction Rate Securities
			2014				2013				2012				2014			2013			2012
	Beginning balance		$	(3	)		$	—			$	22			$	23		$	21		$	16
	Changes included in earnings(1)		12				3				5				—			—			—
	Changes in fair value recognized in OCI		—				(2		)		—				3			2			5
	Changes in fair value recognized in net regulatory assets		6				—				(3		)		—			—			—
	Purchases		1				—				—				—			—			—
	Settlements		(4		)		(4		)		(24		)		—			—			—
	Ending balance		$	12			$	(3	)		$	—			$	26		$	23		$	21
	-1	Changes included in earnings are reported as nonregulated operating revenue on the Statements of Operations. Net unrealized (losses) gains included in earnings for the years ended December 31, 2014, 2013 and 2012, related to commodity derivatives held at December 31, 2014 , 2013 and 2012, totaled $16 million, $(5) 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 as of December 31, (in millions):
		2014								2013
		Carrying				Fair Value				Carrying				Fair Value
		Value								Value
	Long-term debt	$	4,056			$	4,581			$	3,552			$	3,849

Commitments_and_Contingencies_

Commitments and Contingencies (MEC) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Notes to Financial Statements [Line Items]
Commitments and Contingencies Disclosure [Text Block]
	-15	Commitments and Contingencies
	Commitments
	MidAmerican Energy had the following firm commitments that are not reflected on the Balance Sheet. Minimum payments as of December 31, 2014, are as follows (in millions):
													2020 and
			2015		2016		2017		2018		2019		Thereafter		Total
	Contract type:
	Coal and natural gas for generation		$	190	$	118	$	92	$	41	$	—	$	—	$	441
	Electric capacity and transmission		30		31		30		11		11		66		179
	Natural gas contracts for gas operations		148		69		58		22		3		6		306
	Construction commitments		767		56		6		—		—		—		829
	Operating leases, easements and
	maintenance and services contracts		47		48		59		71		70		746		1,041
			$	1,182	$	322	$	245	$	145	$	84	$	818	$	2,796
	Coal, Natural Gas, Electric Capacity and Transmission Commitments
	MidAmerican Energy has coal supply and related transportation and lime contracts for its coal-fueled generating facilities. MidAmerican Energy expects to supplement the coal contracts with additional contracts and spot market purchases to fulfill its future coal supply needs. Additionally, MidAmerican Energy has a natural gas transportation contract for a natural gas-fueled generating facility. The contracts have minimum payment commitments ranging through 2018.
	MidAmerican Energy has various natural gas supply and transportation contracts for its regulated and nonregulated gas operations that have minimum payment commitments ranging through 2025.
	MidAmerican Energy has contracts to purchase electric capacity to meet its electric system energy requirements that have minimum payment commitments ranging through 2028. MidAmerican Energy also has contracts for the right to transmit electricity over other entities' transmission lines with minimum payment commitments ranging through 2019.
	Construction Commitments
	MidAmerican Energy's firm construction commitments reflected in the table above consist primarily of contracts for the construction of wind-powered generating facilities in 2015 and the construction in 2015 through 2017 of four Multi-Value Projects approved by the Midcontinent Independent System Operator, Inc. for high voltage transmission lines in Iowa and Illinois.
	Operating Leases, Easements and Maintenance and Services Contracts
	MidAmerican Energy has non-cancelable operating leases with minimum payment commitments ranging through 2020 primarily for office and other building space, rail cars and computer equipment. These leases generally require the Company to pay for insurance, taxes and maintenance applicable to the leased property. Certain leases contain renewal options for varying periods and escalation clauses for adjusting rent to reflect changes in price indices. MidAmerican Energy also has non-cancelable easements with minimum payment commitments ranging through 2061 for land in Iowa on which its wind-powered generating facilities are located. Additionally, MidAmerican Energy has non-cancelable maintenance and services contracts related to various generating facilities with minimum payment commitments ranging through 2027. Payments on non-cancelable operating leases, easements and maintenance and services contracts totaled $38 million, $34 million and $32 million for 2014, 2013 and 2012, respectively.
	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.
	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.

NonOperating_Other_Net_MEC

Non-Operating Other, Net (MEC) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Components of Other Income (Expense), Nonoperating [Line Items]
Other Income and Other Expense Disclosure [Text Block]	(16)    Non-Operating Income - Other, Net
	Non-operating income - other, net; as shown on the Statements of Operations, includes the following other income (expense) items for the years ended December 31 (in millions):
		2014		2013			2012
	Corporate-owned life insurance income	$	8	$	15		$	9
	Gains on sales of assets and other investments	—		1			2
	Other, net	1		(1		)	(2		)
	Total	$	9	$	15		$	9

Supplemental_Cash_Flows_Inform

Supplemental Cash Flows Information (MEC) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Cash Flow, Supplemental Disclosures [Text Block]	(17)    Supplemental Cash Flow Disclosures
	The summary of supplemental cash flow disclosures as of and for the years ending December 31 is as follows (in millions):
		2014		2013		2012
	Supplemental cash flow information:
	Interest paid, net of amounts capitalized	$	144	$	109	$	123
	Income taxes received, net	$	149	$	36	$	692
	Supplemental disclosure of non-cash investing transactions:
	Accounts payable related to utility plant additions	$	128	$	117	$	122
	Deferred payments on equipment purchased for wind-powered generation(1)	$	—	$	—	$	406
	-1	In conjunction with the construction of wind-powered generating facilities, MidAmerican Energy accrued in gross utility plant in service amounts it was not contractually obligated to pay until a stated future date. Refer to Note 8 for additional information.

Related_Party_Transactions_MEC

Related Party Transactions (MEC) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Related Party Transactions [Line Items]
Related Party Transactions Disclosure [Text Block]
	-18	Related Party Transactions
	The companies identified as affiliates of MidAmerican Energy are Berkshire Hathaway and its subsidiaries, including BHE and its subsidiaries. The basis for the following transactions is provided for in service agreements between MidAmerican Energy and the affiliates.
	MidAmerican Energy is reimbursed for charges incurred on behalf of its affiliates. The majority of these reimbursed expenses are for general costs, such as insurance and building rent, and for employee wages, benefits and costs related to corporate functions such as information technology, human resources, treasury, legal and accounting. The amount of such reimbursements was $58 million, $38 million and $51 million for 2014, 2013 and 2012, respectively.
	MidAmerican Energy reimbursed BHE in the amount of $8 million, $10 million and $7 million in 2014, 2013 and 2012, respectively, for its share of corporate expenses.
	MidAmerican Energy purchases natural gas transportation and storage capacity services from Northern Natural Gas Company, a wholly owned subsidiary of BHE, and coal transportation services from BNSF Railway Company, a wholly-owned subsidiary of Berkshire Hathaway, in the normal course of business at either tariffed or market prices. These purchases totaled $144 million, $155 million and $59 million in 2014, 2013 and 2012, respectively.
	MidAmerican Energy had accounts receivable from affiliates of $12 million and $8 million as of December 31, 2014 and 2013, respectively, that are included in receivables on the Balance Sheets. MidAmerican Energy also had accounts payable to affiliates of $12 million and $14 million as of December 31, 2014 and 2013, respectively, that are included in accounts payable on the Balance Sheets.
	MidAmerican Energy is party to a tax-sharing agreement and is part of the Berkshire Hathaway United States federal income tax return. As of December 31, 2014 and 2013, MidAmerican Energy had current federal and state income taxes receivable from BHE of $299 million and $50 million, respectively. MidAmerican Energy received net cash receipts for federal and state income taxes from BHE totaling $149 million, $36 million and $692 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	MidAmerican Energy recognizes the full amount of the funded status for its pension and postretirement plans, and amounts attributable to MidAmerican Energy's affiliates that have not previously been recognized through income are recognized as an intercompany balance with such affiliates. MidAmerican Energy adjusts these balances when changes to the funded status of the respective plans are recognized and does not intend to settle the balances currently. Amounts receivable from affiliates attributable to the funded status of employee benefit plans totaled $13 million and $5 million as of December 31, 2014 and 2013, respectively, and similar amounts payable to affiliates totaled $30 million and $31 million as of December 31, 2014 and 2013, respectively. See Note 11 for further information pertaining to pension and postretirement accounting.

Segment_Information_MEC

Segment Information (MEC) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Segment Reporting Information [Line Items]
Segment Reporting Disclosure [Text Block]
	-19	Segment Information
	MidAmerican Energy has identified three reportable operating 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. Refer to Note 10 for a discussion of income tax method changes and related items affecting income tax (benefit) expense for the regulated electric and gas operating segments.
	The following tables provide information on a reportable segment basis (in millions):
		Years Ended December 31,
		2014			2013			2012
	Operating revenue:
	Regulated electric	$	1,817		$	1,762		$	1,694
	Regulated gas	996			824			659
	Nonregulated energy	927			817			889
	Total operating revenue	$	3,740		$	3,403		$	3,242
	Depreciation and amortization:
	Regulated electric	$	312		$	366		$	356
	Regulated gas	39			37			36
	Total depreciation and amortization	$	351		$	403		$	392
	Operating income:
	Regulated electric	$	319		$	255		$	270
	Regulated gas	75			74			47
	Nonregulated energy	28			27			53
	Total operating income	$	422		$	356		$	370
	Fixed charges:
	Regulated electric	$	141		$	129		$	123
	Regulated gas	17			15			15
	Total fixed charges	$	158		$	144		$	138
	Income tax (benefit) expense:
	Regulated electric	$	(138	)	$	(136	)	$	(129	)
	Regulated gas	22			23			7
	Nonregulated energy	12			10			23
	Total income tax (benefit) expense	$	(104	)	$	(103	)	$	(99	)
	Earnings on common stock:
	Regulated electric	$	361		$	292		$	297
	Regulated gas	40			41			28
	Nonregulated energy	16			16			29
	Total earnings on common stock	$	417		$	349		$	354
		Years Ended December 31,
		2014			2013			2012
	Utility construction expenditures:
	Regulated electric	$	1,429		$	945		$	588
	Regulated gas	97			81			57
	Total utility construction expenditures	$	1,526		$	1,026		$	645
		As of December 31,
		2014			2013			2012
	Total assets:
	Regulated electric	$	11,859		$	10,532		$	9,898
	Regulated gas	1,231			1,206			1,202
	Nonregulated energy	167			131			132
	Total assets	$	13,257		$	11,869		$	11,232

Unaudited_Quarterly_Operating_

Unaudited Quarterly Operating Results (MEC) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Unaudited Quarterly Operating Results [Line Items]
Unaudited Quarterly Financial Information [Text Block]	(20)    Unaudited Quarterly Operating Results
		2014
		1st Quarter		2nd Quarter		3rd Quarter		4th Quarter
		(In millions)
	Operating revenue	$	1,225	$	769	$	862	$	884
	Operating income	153		51		160		58
	Net income	157		32		170		58
	Earnings on common stock	157		32		170		58
		2013
		1st Quarter		2nd Quarter		3rd Quarter		4th Quarter
		(In millions)
	Operating revenue	$	920	$	757	$	826	$	900
	Operating income	106		43		130		77
	Net income	103		24		145		78
	Earnings on common stock	103		23		145		78
	Quarterly data reflect seasonal variations common to a Midwest utility.

Company_Organization_LLC

Company Organization (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Notes to Financial Statements [Line Items]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
	-1	Company Organization
	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. ("Midwest Capital Group") and MEC Construction Services Co.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Notes to Financial Statements [Line Items]
Significant Accounting Policies [Text Block]
	-2	Summary of Significant Accounting Policies
	In addition to the following significant accounting policies, refer to Note 2 of MidAmerican Energy's Notes to Financial Statements for significant accounting policies of MidAmerican Funding.
	Basis of Consolidation and Presentation
	The Consolidated Financial Statements include the accounts of MidAmerican Funding and its subsidiaries in which it held a controlling financial interest as of the financial statement date. Intercompany accounts and transactions have been eliminated, other than those between rate-regulated operations.
	Goodwill
	Goodwill represents the excess of the purchase price over the fair value of identifiable net assets acquired when MidAmerican Funding purchased MHC. MidAmerican Funding evaluates goodwill for impairment at least annually and completed its annual review as of October 31. When evaluating goodwill for impairment, MidAmerican Funding estimates the fair value of the reporting unit. If the carrying amount of a reporting unit, including goodwill, exceeds the estimated fair value, then the identifiable assets, including identifiable intangible assets, and liabilities of the reporting unit are estimated at fair value as of the current testing date. The excess of the estimated fair value of the reporting unit over the current estimated fair value of net assets establishes the implied value of goodwill. The excess of the recorded goodwill over the implied goodwill value is charged to earnings as an impairment loss. Significant judgment is required in estimating the fair value of the reporting unit and performing goodwill impairment tests. MidAmerican Funding uses a variety of methods to estimate a reporting unit's fair value, principally discounted projected future net cash flows. Key assumptions used include, but are not limited to, the use of estimated future cash flows; multiples of earnings; and an appropriate discount rate. In estimating future cash flows, MidAmerican Funding incorporates current market information, as well as historical factors. As such, the determination of fair value incorporates significant unobservable inputs. During 2014, 2013 and 2012, MidAmerican Funding did not record any goodwill impairments.

Jointly_Owned_Utility_Faciliti1

Jointly Owned Utility Facilities (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Facilities Disclosure [Text Block]
	-3	Jointly Owned Utility Facilities
	Refer to Note 3 of MidAmerican Energy's Notes to Financial Statements.

Regulatory_Matters_LLC

Regulatory Matters (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Regulatory Matters Disclosure [Line Items]
Regulatory Matters [Text Block]
	-4	Regulatory Matters
	Refer to Note 4 of MidAmerican Energy's Notes to Financial Statements.

Investments_and_Nonregulated_P1

Investments and Nonregulated Property, Net (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Investments and Nonregulated Property, Net [Line Items]
Investments and Nonregulated Property, Net [Text Block]
	-5	Investments and Nonregulated Property, Net
	Investments and nonregulated property, net consists of the following amounts as of December 31 (in millions):
		2014		2013
	Nuclear decommissioning trust	$	424	$	394
	Rabbi trusts	177		177
	Auction rate securities	26		23
	Nonregulated property, net of accumulated depreciation of $11 and $11, respectively	21		21
	Other	3		10
	Total	$	651	$	625
	In addition to the following discussion, refer to Note 5 of MidAmerican Energy's Notes to Financial Statements for additional information regarding the investments included in the table above. In addition to assets of MidAmerican Energy, nonregulated property, net includes a corporate aircraft owned by MHC.

Components_of_Accumulated_Othe1

Components of Accumulated Other Comprehensive Loss, Net (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Schedule of accumulated other comprehensive income (loss) [Line Items]
Components of Accumulated Other Comprehensive Loss, Net [Text Block]
	-6	Components of Accumulated Other Comprehensive Loss, Net
	Refer to Note 6 of MidAmerican Energy's Notes to Financial Statements.

Noncontrolling_Interests_LLC

Noncontrolling Interests (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Noncontrolling Interest [Line Items]
Noncontrolling Interest Disclosure [Text Block]
	-7	Noncontrolling Interests
	Refer to Note 7 of MidAmerican Energy's Notes to Financial Statements for a discussion of MidAmerican Energy's preferred securities, which were MidAmerican Funding's noncontrolling interest at the time of their redemption.

LongTerm_Debt_LLC

Long-Term Debt (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Debt Instrument [Line Items]
Long-term Debt [Text Block]	(8)    Long-Term Debt
	Refer to MidAmerican Funding's Consolidated Statements of Capitalization for detail of long-term debt and to Note 8 of MidAmerican Energy's Notes to Financial Statements for a discussion of its long-term debt. In addition to MidAmerican Energy's annual repayments of long-term debt, MidAmerican Funding has $325 million of long-term debt due in 2029.
	MidAmerican Funding parent company long-term debt is secured by a pledge of the common stock of MHC. See Item 15(c) for the Consolidated Financial Statements of MHC Inc. and subsidiaries. The bonds are the direct senior secured obligations of MidAmerican Funding and effectively rank junior to all indebtedness and other liabilities of the direct and indirect subsidiaries of MidAmerican Funding, to the extent of the assets of these subsidiaries. MidAmerican Funding may redeem the bonds in whole or in part at any time at a redemption price equal to the sum of any accrued and unpaid interest to the date of redemption and the greater of (1) 100% of the principal amount of the bonds or (2) the sum of the present values of the remaining scheduled payments of principal and interest on the bonds, discounted to the date of redemption on a semiannual basis at the treasury yield plus 25 basis points.
	Subsidiaries of MidAmerican Funding must make payments on their own indebtedness before making distributions to MidAmerican Funding. Refer to Note 8 of MidAmerican Energy's Notes to Financial Statements for a discussion of utility regulatory restrictions affecting distributions from MidAmerican Energy. As a result of the utility regulatory restrictions agreed to by MidAmerican Energy in March 1999, MidAmerican Funding had restricted net assets of $2.9 billion as of December 31, 2014.
	As of December 31, 2014, MidAmerican Funding was in compliance with all of its applicable long-term debt covenants.
	Each of MidAmerican Funding's direct or indirect subsidiaries is organized as a legal entity separate and apart from MidAmerican Funding and its other subsidiaries. It should not be assumed that any asset of any subsidiary of MidAmerican Funding will be available to satisfy the obligations of MidAmerican Funding or any of its other subsidiaries; provided, however, that unrestricted cash or other assets which are available for distribution may, subject to applicable law and the terms of financing arrangements of such parties, be advanced, loaned, paid as dividends or otherwise distributed or contributed to MidAmerican Funding, one of its subsidiaries or affiliates thereof.

Recovered_Sheet1

Short-Term Debt and Revolving Credit Facilities (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Line of Credit Facility [Line Items]
Short-term Debt [Text Block]
	-9	Short-Term Debt and Credit Facilities
	Refer to Note 9 of MidAmerican Energy's Notes to Financial Statements. In addition to MidAmerican Energy's credit facilities, MHC has a $4 million unsecured credit facility, which expires in June 2015 and has a variable interest rate based on LIBOR plus a spread. As of December 31, 2014 and 2013, there were no borrowings outstanding under this credit facility. As of December 31, 2014, MHC was in compliance with the covenants of its credit facility.

Income_Taxes_LLC

Income Taxes (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Income Tax Disclosure [Line Items]
Income Tax Disclosure [Text Block]	(10)    Income Taxes
	MidAmerican Funding's income tax benefit consists of the following for the years ended December 31 (in millions):
		2014				2013				2012
	Current:
	Federal	$	(404	)		$	(200	)		$	(260	)
	State	(4		)		(12		)		(23		)
		(408		)		(212		)		(283		)
	Deferred:
	Federal	297				100				198
	State	2				3				(21		)
		299				103				177
	Investment tax credits	(1		)		(1		)		(2		)
	Total	$	(110	)		$	(110	)		$	(108	)
	A reconciliation of the federal statutory income tax rate MidAmerican Funding's the effective income tax rate applicable to income before income tax benefit is as follows for the years ended December 31:
		2014			2013			2012
	Federal statutory income tax rate	35	%		35	%		35	%
	Income tax credits	(61	)		(75	)		(60	)
	State income tax, net of federal income tax benefit	(1	)		(3	)		(12	)
	Income tax method changes	—			—			(6	)
	Effects of ratemaking	(9	)		(3	)		(1	)
	Other, net	(1	)		(2	)		(2	)
	Effective income tax rate	(37	)%		(48	)%		(46	)%
	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.
	MidAmerican Energy's income tax benefit for the year ended December 31, 2012, reflects $16 million of federal income tax benefits recognized in connection with an income tax method change for income tax years prior to 2012 related to repair costs for its regulated utility electric transmission and distribution assets based on guidance published by the Internal Revenue Service.
	The income tax method change results in current deductibility for applicable repair costs, which are capitalized for book purposes. MidAmerican Energy retroactively applied the method changes and deducted amounts related to prior years' costs on the tax return that includes the year of change. State utility rate regulation in Iowa requires that the tax effect of certain temporary differences be flowed through immediately to customers. Therefore, certain deferred amounts that would otherwise have been recognized in income tax expense have been included as changes in regulatory assets in recognition of MidAmerican Energy's ability to recover increased tax expense when such temporary differences reverse. This treatment of such temporary differences impacts income tax expense and effective income tax rates from year to year.
	MidAmerican Funding's net deferred income tax liability consists of the following as of December 31 (in millions):
		2014				2013
	Deferred income tax assets:
	Regulatory liabilities	$	332			$	351
	Employee benefits	68				61
	Derivative contracts	30				9
	Asset retirement obligations	185				172
	Other	69				72
	Total deferred income tax assets	684				665
	Deferred income tax liabilities:
	Depreciable property	(2,950		)		(2,604		)
	Regulatory assets	(366		)		(304		)
	Other	(25		)		(43		)
	Total deferred income tax liabilities	(3,341		)		(2,951		)
	Net deferred income tax liability	$	(2,657	)		$	(2,286	)
	Reflected as:
	Current assets - other	$	—			$	4
	Deferred income taxes	(2,657		)		(2,290		)
		$	(2,657	)		$	(2,286	)
	As of December 31, 2014, MidAmerican Funding has available $20 million of state carryforwards, principally related to $429 million of net operating losses, that expire at various intervals between 2015 and 2033.
	The United States Internal Revenue Service has effectively settled its examination of BHE's income tax returns through December 2009, including components related to MidAmerican Funding. In addition, state jurisdictions have closed their examinations of MidAmerican Funding's income tax returns through at least February 9, 2006, including Iowa and Illinois, which are closed through December 31, 2012, and December 31, 2008, respectively.
	A reconciliation of the beginning and ending balances of MidAmerican Funding's net unrecognized tax benefits is as follows for the years ended December 31 (in millions):
		2014				2013
	Beginning balance	$	29			$	37
	Additions based on tax positions related to the current year	6				11
	Additions for tax positions of prior years	38				3
	Reductions based on tax positions related to the current year	(4		)		(10		)
	Reductions for tax positions of prior years	(40		)		(9		)
	Statute of limitations	(3		)		(2		)
	Settlements	—				(1		)
	Ending balance	$	26			$	29
	As of December 31, 2014 and 2013, substantially all of MidAmerican Funding's unrecognized tax benefits of $26 million and $29 million, respectively, if recognized, would have an impact on the effective tax rate. The unrecognized tax benefits relate to tax positions for which ultimate deductibility is highly certain but for which there is uncertainty as to the timing of such deductibility.

Employee_Benefit_Plans_LLC

Employee Benefit Plans (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Disclosure [Text Block]
	-11	Employee Benefit Plans
	Refer to Note 11 of MidAmerican Energy's Notes to Financial Statements for additional information regarding MidAmerican Funding's pension, supplemental retirement and postretirement benefit plans.
	Pension and postretirement costs allocated by MidAmerican Funding to its parent and other affiliates in each of the years ended December 31, were as follows (in millions):
		2014			2013			2012
	Pension costs	$	4		$	6		$	5
	Other postretirement costs	(2		)	(2		)	(2		)

Asset_Retirement_Obligations_L

Asset Retirement Obligations (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Asset Retirement Obligations Disclosure [Line Items]
Asset Retirement Obligation Disclosure [Text Block]
	-12	Asset Retirement Obligations
	Refer to Note 12 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])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Derivatives, Fair Value [Line Items]
Derivative Instruments and Hedging Activities Disclosure [Text Block]
	-13	Risk Management and Hedging Activities
	Refer to Note 13 of MidAmerican Energy's Notes to Financial Statements.

Fair_Value_Measurements_LLC

Fair Value Measurements (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Disclosures [Text Block]	(14)    Fair Value Measurements
	Refer to Note 14 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 as of December 31 (in millions):
		2014				2013
		Carrying		Fair Value		Carrying		Fair Value
		Value				Value
	Long-term debt	$	4,381	$	5,012	$	3,877	$	4,245

Commitments_and_Contingencies_1

Commitments and Contingencies (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Notes to Financial Statements [Line Items]
Commitments and Contingencies Disclosure [Text Block]	(15)    Commitments and Contingencies
	Refer to Note 15 of MidAmerican Energy's Notes to Financial Statements.
	Legal Matters
	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.

NonOperating_Other_Net_LLC

Non-Operating Other, Net (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Components of Other Income (Expense), Nonoperating [Line Items]
Other Income and Other Expense Disclosure [Text Block]	(16)    Non-Operating Income - Other, Net
	Non-operating income - other, net; as shown on the Consolidated Statements of Operations, includes the following other income (expense) items for the years ended December 31 (in millions):
		2014		2013		2012
	Corporate-owned life insurance income	$	8	$	15	$	9
	Gains on sales of assets and other investments	—		1		2
	Leverage leases	5		2		2
	Other, net	4		3		—
	Total	$	17	$	21	$	13

Supplemental_Cash_Flows_Inform1

Supplemental Cash Flows Information (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Cash Flow, Supplemental Disclosures [Text Block]	(17)    Supplemental Cash Flow Information
	The summary of supplemental cash flow information as of and for the years ending December 31 is as follows (in millions):
		2014		2013		2012
	Supplemental cash flow information:
	Interest paid, net of amounts capitalized	$	167	$	132	$	147
	Income taxes received, net	$	153	$	42	$	698
	Supplemental disclosure of non-cash investing transactions:
	Accounts payable related to utility plant additions	$	128	$	117	$	122
	Deferred payments on equipment purchased for wind-powered generation	$	—	$	—	$	406
	at MidAmerican Energy(1)
	-1	In conjunction with the construction of wind-powered generating facilities, MidAmerican Energy accrued in gross utility plant in service amounts it was not contractually obligated to pay until a stated future date. Refer to Note 8 for additional information.

Related_Party_Transactions_LLC

Related Party Transactions (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Related Party Transactions [Line Items]
Related Party Transactions Disclosure [Text Block]
	-18	Related Party Transactions
	The companies identified as affiliates of MidAmerican Funding are Berkshire Hathaway and its subsidiaries, including BHE and its subsidiaries. The basis for the following transactions is provided for in service agreements between MidAmerican Funding and the affiliates.
	MidAmerican Funding is reimbursed for charges incurred on behalf of its affiliates. The majority of these reimbursed expenses are for allocated general costs, such as insurance and building rent, and for employee wages, benefits and costs for corporate functions, such as information technology, human resources, treasury, legal and accounting. The amount of such reimbursements was $37 million, $28 million and $42 million for 2014, 2013 and 2012, respectively.
	MidAmerican Funding reimbursed BHE in the amount of $8 million, $10 million and $7 million in 2014, 2013 and 2012, respectively, for its share of corporate expenses.
	MidAmerican Energy purchases natural gas transportation and storage capacity services from Northern Natural Gas Company, a wholly owned subsidiary of BHE, and coal transportation services from BNSF Railway Company, a wholly-owned subsidiary of Berkshire Hathaway, in the normal course of business at either tariffed or market prices. These purchases totaled $144 million, $155 million and $59 million in 2014, 2013 and 2012, respectively.
	MHC has a $300 million revolving credit arrangement carrying interest at the 30-day LIBOR rate plus a spread to borrow from BHE. Outstanding balances are unsecured and due on demand. The outstanding balance was $136 million at an interest rate of 0.408% as of December 31, 2014, and $135 million at an interest rate of 0.418% as of December 31, 2013, and is reflected as note payable to affiliate on the Consolidated Balance Sheet.
	BHE has a $100 million revolving credit arrangement, carrying interest at the 30-day LIBOR rate plus a spread to borrow from MHC. Outstanding balances are unsecured and due on demand. There were no borrowings outstanding throughout 2014 and 2013.
	MidAmerican Funding had accounts receivable from affiliates of $7 million as of December 31, 2014 and 2013, respectively, that are included in receivables, net on the Consolidated Balance Sheets. MidAmerican Funding also had accounts payable to affiliates of $12 million and $14 million as of December 31, 2014 and 2013, respectively, that are included in accounts payable on the Consolidated Balance Sheets.
	MidAmerican Funding is party to a tax-sharing agreement and is part of the Berkshire Hathaway United States federal income tax return. As of December 31, 2014 and 2013, MidAmerican Funding had current federal and state income taxes receivable from BHE of $296 million and $46 million, respectively. MidAmerican Funding received net cash receipts for federal and state income taxes from BHE totaling $154 million, $42 million and $698 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	MidAmerican Funding recognizes the full amount of the funded status for its pension and postretirement plans, and amounts attributable to MidAmerican Funding's affiliates that have not previously been recognized through income are recognized as an intercompany balance with such affiliates. MidAmerican Funding adjusts these balances when changes to the funded status of the respective plans are recognized and does not intend to settle the balances currently. Amounts receivable from affiliates attributable to the funded status of employee benefit plans totaled $13 million and $5 million as of December 31, 2014 and 2013, respectively, and similar amounts payable to affiliates totaled $30 million and $31 million as of December 31, 2014 and 2013, respectively. See Note 11 for further information pertaining to pension and postretirement accounting.
	The indenture pertaining to MidAmerican Funding's long-term debt restricts MidAmerican Funding from paying a distribution on its equity securities, unless after making such distribution either its debt to total capital ratio does not exceed 0.67:1 and its interest coverage ratio is not less than 2.2:1 or its senior secured long-term debt rating is at least BBB or its equivalent. MidAmerican Funding may seek a release from this restriction upon delivery to the indenture trustee of written confirmation from the ratings agencies that without this restriction MidAmerican Funding's senior secured long-term debt would be rated at least BBB+.

Segment_Information_LLC

Segment Information (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Segment Reporting Information [Line Items]
Segment Reporting Disclosure [Text Block]
	-19	Segment Information
	MidAmerican Funding has identified three reportable operating 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. Refer to Note 10 for a discussion of income tax method changes and related items affecting income tax (benefit) expense for the regulated electric and gas operating segments.
	The following tables provide information on a reportable segment basis (in millions):
		Years Ended December 31,
		2014			2013			2012
	Operating revenue:
	Regulated electric	$	1,817		$	1,762		$	1,694
	Regulated gas	996			824			659
	Nonregulated energy	927			817			889
	Other	22			10			5
	Total operating revenue	$	3,762		$	3,413		$	3,247
	Depreciation and amortization:
	Regulated electric	$	312		$	366		$	356
	Regulated gas	39			37			36
	Total depreciation and amortization	$	351		$	403		$	392
	Operating income:
	Regulated electric	$	319		$	255		$	270
	Regulated gas	75			74			47
	Nonregulated energy	28			27			53
	Other	1			1			(1		)
	Total operating income	$	423		$	357		$	369
	Fixed charges:
	Regulated electric	$	141		$	129		$	123
	Regulated gas	17			15			15
	Other	23			23			24
	Total fixed charges	$	181		$	167		$	162
	Income tax (benefit) expense:
	Regulated electric	$	(138	)	$	(136	)	$	(129	)
	Regulated gas	22			23			7
	Nonregulated energy	12			10			23
	Other	(6		)	(7		)	(9		)
	Total income tax (benefit) expense	$	(110	)	$	(110	)	$	(108	)
	Net income attributable to MidAmerican Funding:
	Regulated electric	$	361		$	292		$	297
	Regulated gas	40			41			28
	Nonregulated energy	16			16			29
	Other	(8		)	(9		)	(12		)
	Total net income attributable to MidAmerican Funding	$	409		$	340		$	342
	Utility construction expenditures:
	Regulated electric	$	1,429		$	945		$	588
	Regulated gas	97			81			57
	Total utility construction expenditures	$	1,526		$	1,026		$	645
		As of December 31,
		2014			2013			2012
	Total assets:
	Regulated electric	$	13,050		$	11,723		$	11,089
	Regulated gas	1,310			1,285			1,280
	Nonregulated energy	167			131			132
	Other	17			28			29
	Total assets	$	14,544		$	13,167		$	12,530
	Goodwill by reportable segment as of December 31, 2014 and 2013, was as follows (in millions):
	Regulated electric	$	1,191
	Regulated gas	79
	Total	$	1,270

Unaudited_Quarterly_Operating_1

Unaudited Quarterly Operating Results (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Unaudited Quarterly Operating Results [Line Items]
Unaudited Quarterly Financial Information [Text Block]
	-20	Unaudited Quarterly Operating Results
		2014
		1st Quarter		2nd Quarter		3rd Quarter		4th Quarter
		(In millions)
	Operating revenue	$	1,230	$	775	$	864	$	893
	Operating income	153		51		161		58
	Net income	155		30		168		56
	Net income attributable to MidAmerican Funding	155		30		168		56
		2013
		1st Quarter		2nd Quarter		3rd Quarter		4th Quarter
		(In millions)
	Operating revenue	$	921	$	759	$	828	$	905
	Operating income	106		43		130		78
	Net income	100		22		143		76
	Net income attributable to MidAmerican Funding	100		21		143		76
	Quarterly data reflect seasonal variations common to a Midwest utility.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (MEC) Summary of Significant Accounting (Policies) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Notes to Financial Statements [Line Items]
Use of Estimates in Preparation of Financial Statements [Policy Text Block]	Use of Estimates in Preparation of Financial Statements
	The preparation of the Financial Statements in conformity with accounting principles generally accepted in the United States of America ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the period. These estimates include, but are not limited to, the effects of regulation; certain assumptions made in accounting for pension and other postretirement benefits; asset retirement obligations ("AROs"); income taxes; unbilled revenue; valuation of certain financial assets and liabilities, including derivative contracts; and accounting for contingencies. Actual results may differ from the estimates used in preparing the Financial Statements.
Accounting for the Effects of Certain Types of Regulation [Policy Text Block]	Accounting for the Effects of Certain Types of Regulation
	MidAmerican Energy's utility operations are subject to the regulation of the Iowa Utilities Board ("IUB"), the Illinois Commerce Commission ("ICC"), the South Dakota Public Utilities Commission, and the Federal Energy Regulatory Commission ("FERC"). MidAmerican Energy's accounting policies and the accompanying Financial Statements conform to GAAP applicable to rate-regulated enterprises and reflect the effects of the ratemaking process.
	MidAmerican Energy prepares its financial statements in accordance with authoritative guidance for regulated operations, which recognizes the economic effects of regulation. Accordingly, MidAmerican Energy defers the recognition of certain costs or income if it is probable that, through the ratemaking process, there will be a corresponding increase or decrease in future regulated rates. Regulatory assets and liabilities are established to reflect the impacts of these deferrals, which will be recognized in earnings in the periods the corresponding changes in regulated rates occur.
	MidAmerican Energy continually evaluates the applicability of the guidance for regulated operations and whether its regulatory assets and liabilities are probable of inclusion in future regulated rates by considering factors such as a change in the regulator's approach to setting rates from cost-based ratemaking to another form of regulation, other regulatory actions or the impact of competition, that could limit MidAmerican Energy's ability to recover its costs. MidAmerican Energy believes the application of the guidance for regulated operations is appropriate, and its existing regulatory assets and liabilities are probable of inclusion in future regulated rates. The evaluation reflects the current political and regulatory climate at both the federal and state levels. If it becomes no longer probable that the deferred costs or income will be included in future regulated rates, the related regulatory assets and liabilities will be written off to net income, returned to customers or re-established as accumulated other comprehensive income (loss) ("AOCI").
Fair Value Measurements [Policy Text Block]	Fair Value Measurements
	As defined under GAAP, fair value is the price that would be received to sell an asset or paid to transfer a liability between market participants in the principal market or in the most advantageous market when no principal market exists. Adjustments to transaction prices or quoted market prices may be required in illiquid or disorderly markets in order to estimate fair value. Different valuation techniques may be appropriate under the circumstances to determine the value that would be received to sell an asset or paid to transfer a liability in an orderly transaction. Market participants are assumed to be independent, knowledgeable, able and willing to transact an exchange and not under duress. Nonperformance or credit risk is considered in determining fair value. Considerable judgment may be required in interpreting market data used to develop the estimates of fair value. Accordingly, estimates of fair value presented herein are not necessarily indicative of the amounts that could be realized in a current or future market exchange.
Cash Equivalents [Policy Text Block]	Cash Equivalents and Restricted Cash and Investments
	Cash equivalents consist of funds invested in money market mutual funds, United States Treasury Bills and other investments with a maturity of three months or less when purchased. Cash and cash equivalents exclude amounts where availability is restricted by legal requirements, loan agreements or other contractual provisions. Restricted amounts are included in other current assets and investments and nonregulated property, net on the Balance Sheets.
Investments [Policy Text Block]	Investments
	MidAmerican Energy's management determines the appropriate classification of investments in debt and equity securities at the acquisition date and reevaluates the classification at each balance sheet date. Investments that management does not intend to use or is restricted from using in current operations are presented as noncurrent on the Balance Sheets.
	Available-for-sale securities are carried at fair value with realized gains and losses, as determined on a specific identification basis, recognized in earnings and unrealized gains and losses recognized in AOCI, net of tax. Realized and unrealized gains and losses on securities in a trust related to the decommissioning of the Quad Cities Generating Station Units 1 and 2 ("Quad Cities Station") are recorded as a net regulatory liability because MidAmerican Energy expects to recover costs for these activities through regulated rates. Held-to-maturity securities are carried at amortized cost, reflecting the ability and intent to hold the securities to maturity.
	Investments gains and losses arise when investments are sold (as determined on a specific identification basis) or are other-than-temporarily impaired. If a decline in value of an investment below cost is deemed other than temporary, the cost of the investment is written down to fair value, with a corresponding charge to earnings. Factors considered in judging whether an impairment is other than temporary include: the financial condition, business prospects and creditworthiness of the issuer; the relative amount of the decline; MidAmerican Energy's ability and intent to hold the investment until the fair value recovers; and the length of time that fair value has been less than cost. Impairment losses on equity securities are charged to earnings. With respect to an investment in a debt security, any resulting impairment loss is recognized in earnings if MidAmerican Energy intends to sell, or expects to be required to sell, the debt security before its amortized cost is recovered. If MidAmerican Energy does not expect to ultimately recover the amortized cost basis even if it does not intend to sell the security, the credit loss component is recognized in earnings and any difference between fair value and the amortized cost basis, net of the credit loss, is reflected in other comprehensive income (loss) ("OCI"). For regulated investments, any impairment charge is offset by the establishment of a regulatory asset to the extent recovery in regulated rates is probable.
Allowance for Doubtful Accounts [Policy Text Block]	Allowance for Doubtful Accounts
	Receivables are stated at the outstanding principal amount, net of an estimated allowance for doubtful accounts. The allowance for doubtful accounts is based on MidAmerican Energy's assessment of the collectibility of amounts owed to it by its customers. This assessment requires judgment regarding the ability of customers to pay or the outcome of any pending disputes. As of December 31, 2014 and 2013, the allowance for doubtful accounts totaled $7 million and $10 million, respectively, and is included in receivables, net on the Balance Sheets.
Derivatives [Policy Text Block]	Derivatives
	MidAmerican Energy employs a number of different derivative contracts, including forwards, futures, options, swaps and other agreements, to manage price risk for electricity, natural gas and other commodities, and interest rate risk. 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. Derivative balances reflect offsetting permitted under master netting agreements with counterparties and cash collateral paid or received under such agreements. Cash collateral received from or paid to counterparties to secure derivative contract assets or liabilities in excess of amounts offset is included in other current assets on the Balance Sheets.
	Commodity derivatives used in normal business operations that are settled by physical delivery, among other criteria, are eligible for and may be designated as normal purchases or normal sales. Normal purchases or normal sales contracts are not marked to market, and settled amounts are recognized as operating revenue or cost of sales on the Statements of Operations.
	For MidAmerican Energy's derivatives not designated as hedging contracts, the settled amount is generally included in regulated rates. Accordingly, the net unrealized gains and losses associated with interim price movements on contracts that are accounted for as derivatives and probable of inclusion in regulated rates are recorded as regulatory assets and liabilities. For MidAmerican Energy's derivatives not designated as hedging contracts and for which changes in fair value are not recorded as regulatory assets and liabilities, unrealized gains and losses are recognized on the Statements of Operations as nonregulated operating revenue for sales contracts and as nonregulated cost of sales for purchase contracts and electricity and natural gas swap contracts.
	For MidAmerican Energy's derivatives designated as hedging contracts, MidAmerican Energy formally assesses, at inception and thereafter, whether the hedging contract is highly effective in offsetting changes in the hedged item. MidAmerican Energy formally documents hedging activity by transaction type and risk management strategy.
	Changes in the estimated fair value of a derivative contract designated and qualified as a cash flow hedge, to the extent effective, are included on the Statements of Changes in Equity as AOCI, net of tax, until the contract settles and the hedged item is recognized in earnings. MidAmerican Energy discontinues hedge accounting prospectively when it has determined that a derivative contract no longer qualifies as an effective hedge, or when it is no longer probable that the hedged forecasted transaction will occur. When hedge accounting is discontinued because the derivative contract no longer qualifies as an effective hedge, future changes in the estimated fair value of the derivative contract are charged to earnings. Gains and losses related to discontinued hedges that were previously recorded in AOCI will remain in AOCI until the contract settles and the hedged item is recognized in earnings, unless it becomes probable that the hedged forecasted transaction will not occur, at which time associated deferred amounts in AOCI are immediately recognized in earnings.
Inventories [Policy Text Block]	Inventories
	Inventories consist mainly of materials and supplies, totaling $101 million and $95 million as of December 31, 2014 and 2013, respectively, coal stocks, totaling $54 million and $109 million as of December 31, 2014 and 2013, respectively, and natural gas in storage, totaling $24 million and $19 million as of December 31, 2014 and 2013, respectively. The cost of materials and supplies, coal stocks and fuel oil is determined using the average cost method. The cost of stored natural gas is determined using the last-in-first-out method. With respect to stored natural gas, the replacement cost would be $41 million and $36 million higher as of December 31, 2014 and 2013, respectively.
Utility Plant, Net - General [Policy Text Block]	Utility Plant, Net
	General
	Additions to utility plant are recorded at cost. MidAmerican Energy capitalizes all construction-related material, direct labor and contract services, as well as indirect construction costs. Indirect construction costs include debt allowance for funds used during construction ("AFUDC") and equity AFUDC. The cost of additions and betterments are capitalized, while costs incurred that do not improve or extend the useful lives of the related assets are generally expensed. Additionally, MidAmerican Energy has regulatory arrangements in Iowa in which the carrying cost of certain utility plant has been reduced for amounts associated with electric returns on equity exceeding specified thresholds.
	Depreciation and amortization for MidAmerican Energy's utility operations are computed by applying the composite or straight-line method based on either estimated useful lives or mandated recovery periods as prescribed by its various regulatory authorities. Depreciation studies are completed by MidAmerican Energy to determine the appropriate group lives, net salvage and group depreciation rates. These studies are reviewed and rates are ultimately approved by the applicable regulatory commission. Net salvage includes the estimated future residual values of the assets and any estimated removal costs recovered through approved depreciation rates. Estimated removal costs are recorded as either a cost of removal regulatory liability or an ARO liability on the Balance Sheets, depending on whether the obligation meets the requirements of an ARO. As actual removal costs are incurred, the associated liability is reduced.
	During the third quarter of 2012, MidAmerican Energy revised its depreciation rates for certain coal-fueled generation facilities reflecting shorter estimated useful lives. The effect of this change increased depreciation and amortization expense by $5 million in 2012 and $11 million annually based on depreciable plant balances at the time of the change. During the third quarter of 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 $20 million in 2013 and $49 million annually based on depreciable plant balances at the time of the change. 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 based on depreciable plant balances at the time of the change.
	The average depreciation and amortization rates applied to depreciable utility plant for the years ended December 31 were as follows:
		2014		2013		2012
	Electric	2.8	%	3.3	%	3.3	%
	Gas	2.8	%	2.8	%	2.8	%
	Generally, when MidAmerican Energy retires or sells a component of utility plant, it charges the original cost, net of any proceeds from the disposition to accumulated depreciation. Any gain or loss on disposals of nonregulated assets is recorded through earnings.
	Debt and equity AFUDC, which represent the estimated costs of debt and equity funds necessary to finance the construction of its regulated facilities, is capitalized by MidAmerican Energy as a component of utility plant, with offsetting credits to the Statements of Operations. AFUDC is computed based on guidelines set forth by the FERC. After construction is completed, MidAmerican Energy is permitted to earn a return on these costs as a component of the related assets, as well as recover these costs through depreciation expense over the useful lives of the related assets.
Utility Plant, Net - Asset Retirement Obligations [Policy Text Block]	Asset Retirement Obligations
	MidAmerican Energy recognizes AROs when it has a legal obligation to perform decommissioning or removal activities upon retirement of an asset. MidAmerican Energy's AROs are primarily related to decommissioning of the Quad Cities Station and obligations associated with its other generating facilities. The fair value of an ARO liability is recognized in the period in which it is incurred, if a reasonable estimate of fair value can be made, and is added to the carrying amount of the associated asset, which is then depreciated over the remaining useful life of the asset. Subsequent to the initial recognition, the ARO liability is adjusted for any revisions to the original estimate of undiscounted cash flows (with corresponding adjustments to utility plant) and for accretion of the ARO liability due to the passage of time. The difference between the ARO liability, the corresponding ARO asset included in utility plant, net and amounts recovered in rates to satisfy such liabilities is recorded as a regulatory asset or liability.
Utility Plant, Net - Impairment [Policy Text Block]	Impairment
	MidAmerican Energy evaluates long-lived assets for impairment, including utility plant, when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable or the assets are being held for sale. Upon the occurrence of a triggering event, the asset is reviewed to assess whether the estimated undiscounted cash flows expected from the use of the asset plus the residual value from the ultimate disposal exceeds the carrying value of the asset. If the carrying value exceeds the estimated recoverable amounts, the asset is written down to the estimated fair value. The impacts of regulation are considered when evaluating the carrying value of regulated assets. For all other assets, any resulting impairment loss is reflected on the Statements of Operations.
Revenue Recognition [Policy Text Block]	Revenue Recognition
	Revenue from electric and natural gas customers is recognized as electricity or natural gas is delivered or services are provided. Revenue recognized includes billed and unbilled amounts. As of December 31, 2014 and 2013, unbilled revenue was $131 million and $145 million, respectively, and is included in receivables, net on the Balance Sheets.
	The determination of revenue from an individual customer is based on a systematic reading of meters and rates. At the end of each month, amounts of energy provided to customers since the date of the last meter reading are estimated, and the corresponding unbilled revenue is recorded. Factors that can impact the estimate of unbilled energy include, but are not limited to, seasonal weather patterns compared to normal, total volumes supplied to the system, line losses, economic impacts and composition of customer classes. Estimates are reversed in the following month and actual revenue is recorded based on subsequent meter readings.
	All of MidAmerican Energy's regulated retail electric and gas sales are subject to energy adjustment clauses. MidAmerican Energy also has costs that are recovered, at least in part, through bill riders, including demand-side management costs. The clauses and riders allow MidAmerican Energy to adjust the amounts charged for electric and gas service as the related costs change. The costs recovered in revenue through use of the adjustment clauses and bill riders are charged to expense in the same year the related revenue is recognized. At any given time, these costs may be over or under collected from customers. The total under collection included in receivables at December 31, 2014 and 2013, was $25 million and $49 million, respectively.
Sales and Excise Tax [Policy Text Block]	Sales and Excise Tax
	MidAmerican Energy collects from its customers sales and excise taxes assessed by governmental authorities on transactions with customers and later remits the collected taxes to the appropriate authority. If the obligation to pay a particular tax resides with the customer, MidAmerican Energy reports such taxes collected on a net basis and, accordingly, they do not affect the Statement of Operations. Taxes for which the obligation resides with MidAmerican Energy are reported on a gross basis in operating revenue and operating expenses. The amounts reported on a gross basis are not material.
Unamortized Debt Premiums, Discounts and Financing Costs [Policy Text Block]	Unamortized Debt Premiums, Discounts and Financing Costs
	Premiums, discounts and financing costs incurred for the issuance of long-term debt are amortized over the term of the related financing using the effective interest method.
Income Taxes [Policy Text Block]	Income Taxes
	MidAmerican Funding's and MidAmerican Energy's provisions for income taxes have been computed on a stand-alone basis, and substantially all of their respective currently payable or receivable income taxes are remitted to or received from BHE.
	Deferred income tax assets and liabilities are based on differences between the financial statement and income tax basis of assets and liabilities using estimated income tax rates expected to be in effect for the year in which the differences are expected to reverse. Changes in deferred income tax assets and liabilities that are associated with components of OCI are charged or credited directly to OCI. Changes in deferred income tax assets and liabilities that are associated with income tax benefits and expense for certain property-related basis differences and other various differences that MidAmerican Energy is required to pass on to its customers in Iowa are charged or credited directly to a regulatory asset or liability. As of December 31, 2014 and 2013, these amounts were recognized as a net regulatory asset totaling $730 million and $649 million, respectively, and will be included in regulated rates when the temporary differences reverse. Other changes in deferred income tax assets and liabilities are included as a component of income tax expense. Changes in deferred income tax assets and liabilities attributable to changes in enacted income tax rates are charged or credited to income tax expense or a regulatory asset or liability in the period of enactment. Investment tax credits are generally deferred and amortized over the estimated useful lives of the related properties or as prescribed by various regulatory jurisdictions.
Income Tax Uncertainties [Policy Text Block]	In determining MidAmerican Funding's and MidAmerican Energy's income taxes, management is required to interpret complex income tax laws and regulations, which includes consideration of regulatory implications imposed by MidAmerican Energy's various regulatory jurisdictions. MidAmerican Funding's and MidAmerican Energy's income tax returns are subject to continuous examinations by federal, state and local tax authorities that may give rise to different interpretations of these complex laws and regulations. Due to the nature of the examination process, it generally takes years before these examinations are completed and these matters are resolved. MidAmerican Funding and MidAmerican Energy recognize the tax benefit from an uncertain tax position only if it is more-likely-than-not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the Consolidated Financial Statements from such a position are measured based on the largest benefit that is more-likely-than-not to be realized upon ultimate settlement. Although the ultimate resolution of their federal, state and local income tax examinations is uncertain, each company believes it has made adequate provisions for its income tax positions. The aggregate amount of any additional income tax liabilities that may result from these examinations, if any, is not expected to have a material impact on its consolidated financial results. MidAmerican Funding's and MidAmerican Energy's unrecognized tax benefits are primarily included in taxes accrued and other long-term liabilities on their respective Consolidated Balance Sheets. Estimated interest and penalties, if any, related to uncertain tax positions are included as a component of income tax expense on the Consolidated Statements of Operations.
New Accounting Pronouncements [Policy Text Block]	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.

Summary_of_Significant_Account3

Summary of Significant Accounting (Policies) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Notes to Financial Statements [Line Items]
Basis of Consolidation and Presentation [Policy Text Block]	Basis of Consolidation and Presentation
	The Consolidated Financial Statements include the accounts of MidAmerican Funding and its subsidiaries in which it held a controlling financial interest as of the financial statement date. Intercompany accounts and transactions have been eliminated, other than those between rate-regulated operations.
Goodwill [Policy Text Block]	Goodwill
	Goodwill represents the excess of the purchase price over the fair value of identifiable net assets acquired when MidAmerican Funding purchased MHC. MidAmerican Funding evaluates goodwill for impairment at least annually and completed its annual review as of October 31. When evaluating goodwill for impairment, MidAmerican Funding estimates the fair value of the reporting unit. If the carrying amount of a reporting unit, including goodwill, exceeds the estimated fair value, then the identifiable assets, including identifiable intangible assets, and liabilities of the reporting unit are estimated at fair value as of the current testing date. The excess of the estimated fair value of the reporting unit over the current estimated fair value of net assets establishes the implied value of goodwill. The excess of the recorded goodwill over the implied goodwill value is charged to earnings as an impairment loss. Significant judgment is required in estimating the fair value of the reporting unit and performing goodwill impairment tests. MidAmerican Funding uses a variety of methods to estimate a reporting unit's fair value, principally discounted projected future net cash flows. Key assumptions used include, but are not limited to, the use of estimated future cash flows; multiples of earnings; and an appropriate discount rate. In estimating future cash flows, MidAmerican Funding incorporates current market information, as well as historical factors. As such, the determination of fair value incorporates significant unobservable inputs. During 2014, 2013 and 2012, MidAmerican Funding did not record any goodwill impairments.

Summary_of_Significant_Account4

Summary of Significant Accounting Policies (MEC) (Tables) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Notes to Financial Statements [Line Items]
Schedule of Public Utility Property, Plant, and Equipment [Table Text Block]	The average depreciation and amortization rates applied to depreciable utility plant for the years ended December 31 were as follows:
		2014		2013		2012
	Electric	2.8	%	3.3	%	3.3	%
	Gas	2.8	%	2.8	%	2.8	%

Jointly_Owned_Utility_Faciliti2

Jointly Owned Utility Facilities (MEC) (Tables) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Jointly Owned Utility Plant Interests [Line Items]
Schedule of Jointly Owned Utility Plants [Table Text Block]	The amounts shown in the table below represent MidAmerican Energy's share in each jointly owned facility as of December 31, 2014 (dollars in millions):
						Accumulated		Construction
		Company		Plant in		Depreciation and		Work in
		Share		Service		Amortization		Progress
	Louisa Unit No. 1	88	%	$	747	$	392	$	4
	Quad Cities Unit Nos. 1 & 2(1)	25		656		316		27
	Walter Scott, Jr. Unit No. 3	79.1		561		287		7
	Walter Scott, Jr. Unit No. 4(2)	59.7		446		82		3
	George Neal Unit No. 4	40.6		303		142		—
	Ottumwa Unit No. 1	52		530		171		2
	George Neal Unit No. 3	72		390		141		3
	Transmission facilities(3)	Various		243		81		17
	Total			$	3,876	$	1,612	$	63
	-1	Includes amounts related to nuclear fuel.
	-2	Plant in service and accumulated depreciation and amortization amounts are net of credits applied under Iowa revenue sharing arrangements totaling $320 million and $60 million, respectively.
	-3	Includes 345 and 161 kilovolt transmission lines and substations.

Regulatory_Matters_MEC_Tables

Regulatory Matters (MEC) (Tables) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Regulatory Matters Disclosure [Line Items]
Regulatory Assets [Table Text Block]	Regulatory assets represent costs that are expected to be recovered in future regulated rates. MidAmerican Energy's regulatory assets reflected on the Balance Sheets consist of the following as of December 31 (in millions):
		Average
		Remaining Life	2014		2013
	Deferred income taxes, net(1)	24 years	$	730	$	649
	Asset retirement obligations(2)	12 years	62		34
	Employee benefit plans(3)	10 years	42		26
	Unrealized loss on regulated derivative contracts	1 year	38		10
	Other	Various	36		29
	Total		$	908	$	748
	-1	Amounts primarily represent income tax benefits related to state accelerated tax depreciation and certain property-related basis differences that were previously flowed through to customers and will be included in regulated rates when the temporary differences reverse.
	-2	Amount predominantly relates to asset retirement obligations for fossil-fueled and wind-powered generating facilities. Refer to Note 12 for a discussion of asset retirement obligations.
	-3	Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in regulated rates when recognized.
Regulatory Liabilities [Table Text Block]	Regulatory liabilities represent income to be recognized or amounts to be returned to customers in future periods. MidAmerican Energy's regulatory liabilities reflected on the Balance Sheets consist of the following as of December 31 (in millions):
		Average
		Remaining Life	2014		2013
	Cost of removal accrual(1)	24 years	$	642	$	649
	Asset retirement obligations(2)	23 years	159		140
	Employee benefit plans(3)	10 years	5		55
	Other	Various	31		31
	Total		$	837	$	875
	-1	Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing utility plant in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying cost.
	-2	Amount predominantly represents the excess of nuclear decommission trust assets over the related asset retirement obligation. Refer to Note 12 for a discussion of asset retirement obligations.
	-3	Represents amounts not yet recognized as a component of net periodic benefit cost that are to be returned to customers in future periods when recognized.

Investments_and_Nonregulated_P2

Investments and Nonregulated Property, Net (MEC) (Tables) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Investments and Nonregulated Property, Net [Line Items]
Investments and Nonregulated Property, Net [Table Text Block]	Investments and nonregulated property, net consists of the following amounts as of December 31 (in millions):
		2014		2013
	Nuclear decommissioning trust	$	424	$	394
	Rabbi trusts	175		172
	Auction rate securities	26		23
	Nonregulated property, net of accumulated depreciation of $5 and $5, respectively	9		9
	Total	$	634	$	598

Components_of_Accumulated_Othe2

Components of Accumulated Other Comprehensive Loss, Net (MEC) (Tables) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Accumulated Other Comprehensive Loss, Net [Line Items]
Components of Accumulated Other Comprehensive Loss, Net [Table Text Block]	The following table shows the change in accumulated other comprehensive loss by each component of other comprehensive income, net of applicable income taxes, for the years ended December 31, 2014 and 2013 (in millions):
		Unrealized			Unrealized			Accumulated
		Losses on			Losses			Other
		Available-For-Sale			on Cash Flow			Comprehensive
		Securities			Hedges			Loss, Net
	Balance, December 31, 2012	$	(5	)	$	(19	)	$	(24	)
	Other comprehensive income	1			12			13
	Balance, December 31, 2013	$	(4	)	$	(7	)	$	(11	)
	Other comprehensive income (loss)	1			(13		)	(12		)
	Balance, December 31, 2014	$	(3	)	$	(20	)	$	(23	)
	For information regarding cash flow hedge reclassifications from AOCI to net income in their entirety for the years ended December 31, 2014, 2013 and 2012, refer to Note 13.

Longterm_Debt_MEC_Tables

Long-term Debt (MEC) (Tables) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Debt Instrument [Line Items]
Schedule of Maturities of Long-term Debt [Table Text Block]	The annual repayments of MidAmerican Energy's long-term debt for the years beginning January 1, 2015, and thereafter, excluding unamortized discounts, are as follows (in millions):
	2015	$	426
	2016	34
	2017	254
	2018	350
	2019	500
	2020 and thereafter	2,507

Shortterm_Debt_and_Revolving_C1

Short-term Debt and Revolving Credit Facilities (MEC) (Tables) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Line of Credit Facility [Line Items]
Schedule of Line of Credit Facilities [Table Text Block]	The following table summarizes MidAmerican Energy's availability under its two unsecured revolving credit facilities as of December 31 (in millions):
		2014			2013
	Credit facilities	$	605		$	605
	Less:
	Short-term debt outstanding	(50		)	—
	Variable-rate tax-exempt bond support	(195		)	(195		)
	Net credit facilities	$	360		$	410

Income_Taxes_MEC_Tables

Income Taxes (MEC) (Tables) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Income Tax Disclosure [Line Items]
Components of Income Tax Expense (Benefit) [Table Text Block]	MidAmerican Energy's income tax benefit consists of the following for the years ended December 31 (in millions):
		2014				2013				2012
	Current:
	Federal	$	(401	)		$	(196	)		$	(256	)
	State	(3		)		(10		)		(21		)
		(404		)		(206		)		(277		)
	Deferred:
	Federal	299				101				200
	State	2				3				(20		)
		301				104				180
	Investment tax credits	(1		)		(1		)		(2		)
	Total	$	(104	)		$	(103	)		$	(99	)
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 for the years ended December 31:
		2014			2013			2012
	Federal statutory income tax rate	35	%		35	%		35	%
	Income tax credits	(59	)		(70	)		(56	)
	State income tax, net of federal income tax benefit	—			(2	)		(10	)
	Income tax method changes	—			—			(6	)
	Effects of ratemaking	(8	)		(3	)		—
	Other, net	(1	)		(2	)		(2	)
	Effective income tax rate	(33	)%		(42	)%		(39	)%
Components of Net Deferred Income Tax Liability [Table Text Block]	MidAmerican Energy's net deferred income tax liability consists of the following as of December 31 (in millions):
		2014				2013
	Deferred income tax assets:
	Regulatory liabilities	$	332			$	351
	Employee benefits	68				61
	Derivative contracts	30				9
	Asset retirement obligations	185				172
	Other	58				60
	Total deferred income tax assets	673				653
	Deferred income tax liabilities:
	Depreciable property	(2,945		)		(2,599		)
	Regulatory assets	(366		)		(304		)
	Other	(25		)		(40		)
	Total deferred income tax liabilities	(3,336		)		(2,943		)
	Net deferred income tax liability	$	(2,663	)		$	(2,290	)
	Reflected as:
	Current assets - other	$	—			$	4
	Deferred income taxes	(2,663		)		(2,294		)
		$	(2,663	)		$	(2,290	)
Net Unrecognized Tax Benefits Roll Forward [Table Text Block]	A reconciliation of the beginning and ending balances of MidAmerican Energy's net unrecognized tax benefits is as follows for the years ended December 31 (in millions):
		2014				2013
	Beginning balance	$	29			$	36
	Additions based on tax positions related to the current year	6				10
	Additions for tax positions of prior years	38				3
	Reductions based on tax positions related to the current year	(4		)		(10		)
	Reductions for tax positions of prior years	(40		)		(8		)
	Statute of limitations	(3		)		(2		)
	Ending balance	$	26			$	29

Employee_Benefit_Plans_MEC_Tab

Employee Benefit Plans (MEC) (Tables) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Net Benefit Costs [Table Text Block]	Net periodic benefit cost for the plans of MidAmerican Energy and the aforementioned affiliates included the following components for the years ended December 31 (in millions):
		Pension												Other Postretirement
		2014				2013				2012				2014				2013				2012
	Service cost	$	14			$	18			$	18			$	6			$	5			$	4
	Interest cost	35				33				37				10				8				8
	Expected return on plan assets	(45		)		(45		)		(45		)		(15		)		(13		)		(13		)
	Net amortization	1				11				4				(3		)		(3		)		(3		)
	Net periodic benefit cost (benefit)	$	5			$	17			$	14			$	(2	)		$	(3	)		$	(4	)
Schedule of Changes in Fair Value of Plan Assets [Table Text Block]	The following table is a reconciliation of the fair value of plan assets for the years ended December 31 (in millions):
		Pension								Other Postretirement
		2014				2013				2014				2013
	Plan assets at fair value, beginning of year	$	722			$	643			$	256			$	226
	Employer contributions	7				7				1				1
	Participant contributions	—				—				1				1
	Actual return on plan assets	52				142				13				40
	Benefits paid	(51		)		(70		)		(12		)		(12		)
	Plan assets at fair value, end of year	$	730			$	722			$	259			$	256
Schedule of Changes in Projected Benefit Obligations [Table Text Block]	The following table is a reconciliation of the benefit obligations for the years ended December 31 (in millions):
		Pension								Other Postretirement
		2014				2013				2014				2013
	Benefit obligation, beginning of year	$	768			$	846			$	235			$	213
	Service cost	14				18				6				5
	Interest cost	35				33				10				8
	Participant contributions	—				—				1				1
	Actuarial loss (gain)	74				(59		)		9				20
	Benefits paid	(51		)		(70		)		(12		)		(12		)
	Benefit obligation, end of year	$	840			$	768			$	249			$	235
	Accumulated benefit obligation, end of year	$	825			$	751
Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]	The funded status of the plans and the amounts recognized on the Balance Sheets as of December 31 are as follows (in millions):
		Pension								Other Postretirement
		2014				2013				2014				2013
	Plan assets at fair value, end of year	$	730			$	722			$	259			$	256
	Less - Benefit obligation, end of year	840				768				249				235
	Funded status	$	(110	)		$	(46	)		$	10			$	21
	Amounts recognized on the Balance Sheets:
	Other assets	$	12			$	66			$	10			$	21
	Other current liabilities	(8		)		(8		)		—				—
	Other liabilities	(114		)		(104		)		—				—
	Amounts recognized	$	(110	)		$	(46	)		$	10			$	21
Schedule of Net Periodic Benefit Costs Not Yet Recognized [Table Text Block]	A reconciliation of the amounts not yet recognized as components of net periodic benefit cost for the years ended December 31, 2014 and 2013 is as follows (in millions):
		Regulatory				Regulatory				Receivables				Total
		Asset				Liability				(Payables)
										with Affiliates
	Pension
	Balance, December 31, 2012	$	110			$	—			$	15			$	125
	Net gain arising during the year	(91		)		(49		)		(15		)		(155		)
	Net amortization	(3		)		(6		)		(2		)		(11		)
	Total	(94		)		(55		)		(17		)		(166		)
	Balance, December 31, 2013	16				(55		)		(2		)		(41		)
	Net loss arising during the year	6				51				9				66
	Net amortization	—				(1		)		—				(1		)
	Total	6				50				9				65
	Balance, December 31, 2014	$	22			$	(5	)		$	7			$	24
		Regulatory				Regulatory				Receivables				Total
		Asset				Liability				(Payables)
										with Affiliates
	Other Postretirement
	Balance, December 31, 2012	$	11			$	—			$	(13	)		$	(2	)
	Net gain arising during the year	(3		)		—				(4		)		(7		)
	Net amortization	2				—				1				3
	Total	(1		)		—				(3		)		(4		)
	Balance, December 31, 2013	10				—				(16		)		(6		)
	Net loss arising during the year	8				—				2				10
	Net amortization	2				—				1				3
	Total	10				—				3				13
	Balance, December 31, 2014	$	20			$	—			$	(13	)		$	7
	The portion of the funded status of the plans not yet recognized in net periodic benefit cost as of December 31 is as follows (in millions):
		Pension								Other Postretirement
		2014				2013				2014				2013
	Net (gain) loss	$	21			$	(44	)		$	49			$	41
	Prior service cost (credit)	3				3				(42		)		(47		)
	Total	$	24			$	(41	)		$	7			$	(6	)
Schedule of Defined Benefit Plan, Amounts To Be Recognized In Following Year [Table Text Block]	The net loss and prior service cost (credit) that will be amortized in 2015 into net periodic benefit cost are estimated to be as follows (in millions):
		Net				Prior				Total
		Loss				Service
						Cost (Credit)
	Pension	$	1			$	1			$	2
	Other postretirement	2				(5		)		(3		)
	Total	$	3			$	(4	)		$	(1	)
Schedule of Assumptions Used [Table Text Block]	Assumptions used to determine benefit obligations and net periodic benefit cost were as follows:
		Pension									Other Postretirement
		2014			2013			2012			2014			2013			2012
	Benefit obligations as of December 31:
	Discount rate	4	%		4.75	%		4	%		3.75	%		4.5	%		3.75	%
	Rate of compensation increase	2.75	%		3	%		3	%		N/A			N/A			N/A
	Net periodic benefit cost for the years ended December 31:
	Discount rate	4.75	%		4	%		4.75	%		4.5	%		3.75	%		4.75	%
	Expected return on plan assets(1)	7.5	%		7.5	%		7.5	%		7.25	%		7.25	%		7.5	%
	Rate of compensation increase	3	%		3	%		3.5	%		N/A			N/A			N/A
	-1	Amounts reflected are pre-tax values. Assumed after-tax returns for a taxable, non-union other postretirement plan were 5.37% for 2014, and 5.56% for 2013, and 5.75% for 2012.
	In establishing its assumption as to the expected return on plan assets, MidAmerican Energy utilizes the expected asset allocation and return assumptions for each asset class based on historical performance and forward-looking views of the financial markets.
		2014			2013
	Assumed healthcare cost trend rates as of December 31:
	Healthcare cost trend rate assumed for next year	8	%		8	%
	Rate that the cost trend rate gradually declines to	5	%		5	%
	Year that the rate reaches the rate it is assumed to remain at	2025			2019
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]	A one percentage-point change in assumed healthcare cost trend rates would have the following effects (in millions):
		One Percentage-Point
		Increase				Decrease
	Increase (decrease) in:
	Total service and interest cost for the year ended December 31, 2014	$	1			$	—
	Other postretirement benefit obligation as of December 31, 2014	5				(4		)
Schedule of Expected Benefit Payments [Table Text Block]	Net periodic benefit costs assigned to MidAmerican Energy affiliates are reimbursed currently in accordance with its intercompany administrative services agreement. The expected benefit payments to participants in MidAmerican Energy's pension and other postretirement benefit plans for 2015 through 2019 and for the five years thereafter are summarized below (in millions):
		Projected Benefit Payments
		Pension				Other Postretirement
	2015	$	54			$	16
	2016	58				17
	2017	59				19
	2018	59				20
	2019	60				21
	2020-2024	298				109
Schedule of Allocation of Plan Assets [Table Text Block]	The target allocations (percentage of plan assets) for MidAmerican Energy's pension and other postretirement benefit plan assets are as follows as of December 31, 2014:
		Pension		Other
				Postretirement
		%		%
	Debt securities(1)	20-40		25-45
	Equity securities(1)	60-80		50-80
	Real estate funds	8-Feb		—
	Other	0-5		0-5
	-1	For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds are allocated based on the underlying investments in debt and equity securities.
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The following table presents the fair value of plan assets, by major category, for MidAmerican Energy's defined benefit pension plan (in millions):
		Input Levels for Fair Value Measurements(1)
		Level 1				Level 2				Level 3				Total
	As of December 31, 2014
	Cash equivalents	$	—			$	24			$	—			$	24
	Debt securities:
	United States government obligations	8				—				—				8
	Corporate obligations	—				29				—				29
	Municipal obligations	—				4				—				4
	Agency, asset and mortgage-backed obligations	—				33				—				33
	Equity securities:
	United States companies	149				—				—				149
	International equity securities	40				—				—				40
	Investment funds(2)	84				319				—				403
	Real estate funds	—				—				40				40
	Total	$	281			$	409			$	40			$	730
	As of December 31, 2013
	Cash equivalents	$	—			$	10			$	—			$	10
	Debt securities:
	United States government obligations	10				—				—				10
	Corporate obligations	—				30				—				30
	Municipal obligations	—				5				—				5
	Agency, asset and mortgage-backed obligations	—				31				—				31
	Equity securities:
	United States companies	163				—				—				163
	International equity securities	52				—				—				52
	Investment funds(2)	105				285				—				390
	Real estate funds	—				—				31				31
	Total	$	330			$	361			$	31			$	722
	-1	Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy.
	-2	Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 68% and 32%, respectively, for 2014 and 78% and 22%, respectively, for 2013. Additionally, these funds are invested in United States and international securities of approximately 74% and 26%, respectively, for 2014 and 80% and 20%, respectively, for 2013.
	The following table presents the fair value of plan assets, by major category, for MidAmerican Energy's defined benefit other postretirement plans (in millions):
		Input Levels for Fair Value Measurements(1)
		Level 1				Level 2				Level 3				Total
	As of December 31, 2014
	Cash equivalents	$	4			$	—			$	—			$	4
	Debt securities:
	United States government obligations	5				—				—				5
	Corporate obligations	—				11				—				11
	Municipal obligations	—				40				—				40
	Agency, asset and mortgage-backed obligations	—				15				—				15
	Equity securities:
	United States companies	128				—				—				128
	Investment funds(2)	56				—				—				56
	Total	$	193			$	66			$	—			$	259
	As of December 31, 2013
	Cash equivalents	$	1			$	—			$	—			$	1
	Debt securities:
	United States government obligations	7				—				—				7
	Corporate obligations	—				9				—				9
	Municipal obligations	—				37				—				37
	Agency, asset and mortgage-backed obligations	—				13				—				13
	Equity securities:
	United States companies	125				—				—				125
	Investment funds(2)	64				—				—				64
	Total	$	197			$	59			$	—			$	256
	-1	Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy.
	-2	Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 69% and 31%, respectively, for 2014 and 86% and 14%, respectively, for 2013. Additionally, these funds are invested in United States and international securities of approximately 31% and 69%, respectively, for 2014 and 43% and 57%, respectively, for 2013.
	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 December 31, 2014:
	Assets:
	Commodity derivatives		$	1			$	18			$	24			$	(26	)		$	17
Money market mutual funds(2)		1				—				—				—				1
Debt securities:
United States government obligations		136				—				—				—				136
International government obligations		—				1				—				—				1
Corporate obligations		—				39				—				—				39
Municipal obligations		—				2				—				—				2
Agency, asset and mortgage-backed obligations		—				2				—				—				2
Auction rate securities		—				—				26				—				26
Equity securities:
United States companies		238				—				—				—				238
International companies		5				—				—				—				5
		$	381			$	62			$	50			$	(26	)		$	467
Liabilities - commodity derivatives		$	(18	)		$	(87	)		$	(12	)		$	73			$	(44	)
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 $47 million and $- million as of December 31, 2014 and 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.
Schedule of Level Three Defined Benefit Plan Assets Roll Forward [Table Text Block]	The following table reconciles the beginning and ending balances of MidAmerican Energy's pension plan assets measured at fair value using significant Level 3 inputs for the years ended December 31, (in millions):
		Real Estate Funds
		2014				2013				2012
	Beginning balance	$	31			$	26			$	24
	Actual return on plan assets still held at period end	4				5				2
	Purchases and sales	5				—				—
	Ending balance	$	40			$	31			$	26

Asset_Retirement_Obligations_M1

Asset Retirement Obligations (MEC) (Tables) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Asset Retirement Obligations Disclosure [Line Items]
Asset Retirement Obligations by Type [Table Text Block]	The following table presents MidAmerican Energy's ARO liabilities by asset type as of December 31, (in millions):
		2014			2013
	Quad Cities Station	$	265		$	254
	Fossil-fueled generating facilities	132			127
	Wind-powered generating facilities	60			45
	Other	3			4
	Total asset retirement obligations	$	460		$	430
	Quad Cities Station nuclear decommissioning trust funds(1)	$	424		$	394
Asset Retirement Obligations Disclosure [Table Text Block]	The following table reconciles the beginning and ending balances of MidAmerican Energy's ARO liabilities for the years ended December 31, (in millions):
		2014			2013
	Beginning balance	$	430		$	318
	Change in estimated costs	(2		)	88
	Additions	11			5
	Accretion	21			19
	Ending balance	$	460		$	430
	Reflected as:
	Other current liabilities	$	28		$	—
	Asset retirement obligations	432			430
		$	460		$	430

Risk_Management_and_Hedging_Ac2

Risk Management and Hedging Activities (MEC) (Tables) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 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
		Assets			Assets			Liabilities			Liabilities
		- Other			- Other			- Other			- Other			Total
	As of December 31, 2014
	Not designated as hedging contracts(1):
	Commodity assets	$	14		$	3		$	19		$	1		$	37
	Commodity liabilities	—			—			(69		)	(4		)	(73		)
	Total	14			3			(50		)	(3		)	(36		)
	Designated as hedging contracts:
	Commodity assets	—			—			4			2			6
	Commodity liabilities	—			—			(27		)	(17		)	(44		)
	Total	—			—			(23		)	(15		)	(38		)
	Total derivatives	14			3			(73		)	(18		)	(74		)
	Cash collateral receivable	—			—			42			5			47
	Total derivatives - net basis	$	14		$	3		$	(31	)	$	(13	)	$	(27	)
	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. Accordingly, as of December 31, 2014 and 2013, a net regulatory asset of $38 million and $10 million, respectively, was recorded related to the net derivative liability of $36 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 for the years ended December 31 (in millions):
		2014			2013			2012
	Beginning balance	$	10		$	45		$	73
	Changes in fair value recognized in net regulatory assets	61			5			14
	Net (losses) gains reclassified to operating revenue	(28		)	(1		)	21
	Net (losses) gains reclassified to cost of fuel, energy and capacity	(1		)	(1		)	2
	Net losses reclassified to cost of gas sold	(4		)	(38		)	(65		)
	Ending balance	$	38		$	10		$	45
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 unrealized gains (losses) included on the Statements of Operations associated with MidAmerican Energy's derivative contracts not designated as hedging contracts and not recorded as a net regulatory asset or liability for the years ended December 31 (in millions):
		2014			2013			2012
	Nonregulated operating revenue	$	6		$	—		$	8
	Nonregulated cost of sales	9			(2		)	(4		)
	Total	$	15		$	(2	)	$	4
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 loss (pre-tax) and summarizes pre-tax gains and losses on derivative contracts designated and qualifying as cash flow hedges recognized in OCI, as well as amounts reclassified to earnings, for the years ended December 31 (in millions):
		2014			2013			2012
	Beginning balance	$	11		$	32		$	43
	Changes in fair value recognized in OCI	(3		)	(11		)	27
	Net losses reclassified to nonregulated cost of sales	26			(10		)	(38		)
	Ending balance	$	34		$	11		$	32
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]	The following table summarizes the net notional amounts of outstanding derivative contracts with fixed price terms that comprise the mark-to-market values as of December 31 (in millions):
		Unit of
		Measure		2014		2013
	Electricity purchases	Megawatt hours		14		5
	Natural gas purchases	Decatherms		19		21

Fair_Value_Measurements_MEC_Ta

Fair Value Measurements (MEC) (Tables) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 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 the fair value of plan assets, by major category, for MidAmerican Energy's defined benefit pension plan (in millions):
		Input Levels for Fair Value Measurements(1)
		Level 1				Level 2				Level 3				Total
	As of December 31, 2014
	Cash equivalents	$	—			$	24			$	—			$	24
	Debt securities:
	United States government obligations	8				—				—				8
	Corporate obligations	—				29				—				29
	Municipal obligations	—				4				—				4
	Agency, asset and mortgage-backed obligations	—				33				—				33
	Equity securities:
	United States companies	149				—				—				149
	International equity securities	40				—				—				40
	Investment funds(2)	84				319				—				403
	Real estate funds	—				—				40				40
	Total	$	281			$	409			$	40			$	730
	As of December 31, 2013
	Cash equivalents	$	—			$	10			$	—			$	10
	Debt securities:
	United States government obligations	10				—				—				10
	Corporate obligations	—				30				—				30
	Municipal obligations	—				5				—				5
	Agency, asset and mortgage-backed obligations	—				31				—				31
	Equity securities:
	United States companies	163				—				—				163
	International equity securities	52				—				—				52
	Investment funds(2)	105				285				—				390
	Real estate funds	—				—				31				31
	Total	$	330			$	361			$	31			$	722
	-1	Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy.
	-2	Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 68% and 32%, respectively, for 2014 and 78% and 22%, respectively, for 2013. Additionally, these funds are invested in United States and international securities of approximately 74% and 26%, respectively, for 2014 and 80% and 20%, respectively, for 2013.
	The following table presents the fair value of plan assets, by major category, for MidAmerican Energy's defined benefit other postretirement plans (in millions):
		Input Levels for Fair Value Measurements(1)
		Level 1				Level 2				Level 3				Total
	As of December 31, 2014
	Cash equivalents	$	4			$	—			$	—			$	4
	Debt securities:
	United States government obligations	5				—				—				5
	Corporate obligations	—				11				—				11
	Municipal obligations	—				40				—				40
	Agency, asset and mortgage-backed obligations	—				15				—				15
	Equity securities:
	United States companies	128				—				—				128
	Investment funds(2)	56				—				—				56
	Total	$	193			$	66			$	—			$	259
	As of December 31, 2013
	Cash equivalents	$	1			$	—			$	—			$	1
	Debt securities:
	United States government obligations	7				—				—				7
	Corporate obligations	—				9				—				9
	Municipal obligations	—				37				—				37
	Agency, asset and mortgage-backed obligations	—				13				—				13
	Equity securities:
	United States companies	125				—				—				125
	Investment funds(2)	64				—				—				64
	Total	$	197			$	59			$	—			$	256
	-1	Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy.
	-2	Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 69% and 31%, respectively, for 2014 and 86% and 14%, respectively, for 2013. Additionally, these funds are invested in United States and international securities of approximately 31% and 69%, respectively, for 2014 and 43% and 57%, respectively, for 2013.
	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 December 31, 2014:
	Assets:
	Commodity derivatives		$	1			$	18			$	24			$	(26	)	$	17
Money market mutual funds(2)		1				—				—				—			1
Debt securities:
United States government obligations		136				—				—				—			136
International government obligations		—				1				—				—			1
Corporate obligations		—				39				—				—			39
Municipal obligations		—				2				—				—			2
Agency, asset and mortgage-backed obligations		—				2				—				—			2
Auction rate securities		—				—				26				—			26
Equity securities:
United States companies		238				—				—				—			238
International companies		5				—				—				—			5
		$	381			$	62			$	50			$	(26	)	$	467
Liabilities - commodity derivatives		$	(18	)		$	(87	)		$	(12	)		$	73		$	(44	)
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 $47 million and $- million as of December 31, 2014 and 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 measured at fair value on a recurring basis using significant Level 3 inputs for the years ended December 31 (in millions):
			Commodity Derivatives												Auction Rate Securities
			2014				2013				2012				2014			2013			2012
	Beginning balance		$	(3	)		$	—			$	22			$	23		$	21		$	16
	Changes included in earnings(1)		12				3				5				—			—			—
	Changes in fair value recognized in OCI		—				(2		)		—				3			2			5
	Changes in fair value recognized in net regulatory assets		6				—				(3		)		—			—			—
	Purchases		1				—				—				—			—			—
	Settlements		(4		)		(4		)		(24		)		—			—			—
	Ending balance		$	12			$	(3	)		$	—			$	26		$	23		$	21
	-1	Changes included in earnings are reported as nonregulated operating revenue on the Statements of Operations. Net unrealized (losses) gains included in earnings for the years ended December 31, 2014, 2013 and 2012, related to commodity derivatives held at December 31, 2014 , 2013 and 2012, totaled $16 million, $(5) 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 as of December 31, (in millions):
		2014								2013
		Carrying				Fair Value				Carrying				Fair Value
		Value								Value
	Long-term debt	$	4,056			$	4,581			$	3,552			$	3,849

Commitments_and_Contingencies_2

Commitments and Contingencies (MEC) (Tables) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Contractual Obligation [Line Items]
Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block]	MidAmerican Energy had the following firm commitments that are not reflected on the Balance Sheet. Minimum payments as of December 31, 2014, are as follows (in millions):
												2020 and
		2015		2016		2017		2018		2019		Thereafter		Total
	Contract type:
	Coal and natural gas for generation	$	190	$	118	$	92	$	41	$	—	$	—	$	441
	Electric capacity and transmission	30		31		30		11		11		66		179
	Natural gas contracts for gas operations	148		69		58		22		3		6		306
	Construction commitments	767		56		6		—		—		—		829
	Operating leases, easements and
	maintenance and services contracts	47		48		59		71		70		746		1,041
		$	1,182	$	322	$	245	$	145	$	84	$	818	$	2,796

NonOperating_Other_Net_MEC_Tab

Non-Operating Other, Net (MEC) (Tables) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Components of Other Income (Expense), Nonoperating [Line Items]
Schedule of Other Nonoperating Income (Expense) [Table Text Block]	Non-operating income - other, net; as shown on the Statements of Operations, includes the following other income (expense) items for the years ended December 31 (in millions):
		2014		2013			2012
	Corporate-owned life insurance income	$	8	$	15		$	9
	Gains on sales of assets and other investments	—		1			2
	Other, net	1		(1		)	(2		)
	Total	$	9	$	15		$	9

Supplemental_Cash_Flows_Inform2

Supplemental Cash Flows Information (MEC) (Tables) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]	The summary of supplemental cash flow disclosures as of and for the years ending December 31 is as follows (in millions):
		2014		2013		2012
	Supplemental cash flow information:
	Interest paid, net of amounts capitalized	$	144	$	109	$	123
	Income taxes received, net	$	149	$	36	$	692
	Supplemental disclosure of non-cash investing transactions:
	Accounts payable related to utility plant additions	$	128	$	117	$	122
	Deferred payments on equipment purchased for wind-powered generation(1)	$	—	$	—	$	406
	-1	In conjunction with the construction of wind-powered generating facilities, MidAmerican Energy accrued in gross utility plant in service amounts it was not contractually obligated to pay until a stated future date. Refer to Note 8 for additional information.

Segment_Information_MEC_Tables

Segment Information (MEC) (Tables) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 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 operating 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. Refer to Note 10 for a discussion of income tax method changes and related items affecting income tax (benefit) expense for the regulated electric and gas operating segments.
	The following tables provide information on a reportable segment basis (in millions):
		Years Ended December 31,
		2014			2013			2012
	Operating revenue:
	Regulated electric	$	1,817		$	1,762		$	1,694
	Regulated gas	996			824			659
	Nonregulated energy	927			817			889
	Total operating revenue	$	3,740		$	3,403		$	3,242
	Depreciation and amortization:
	Regulated electric	$	312		$	366		$	356
	Regulated gas	39			37			36
	Total depreciation and amortization	$	351		$	403		$	392
	Operating income:
	Regulated electric	$	319		$	255		$	270
	Regulated gas	75			74			47
	Nonregulated energy	28			27			53
	Total operating income	$	422		$	356		$	370
	Fixed charges:
	Regulated electric	$	141		$	129		$	123
	Regulated gas	17			15			15
	Total fixed charges	$	158		$	144		$	138
	Income tax (benefit) expense:
	Regulated electric	$	(138	)	$	(136	)	$	(129	)
	Regulated gas	22			23			7
	Nonregulated energy	12			10			23
	Total income tax (benefit) expense	$	(104	)	$	(103	)	$	(99	)
	Earnings on common stock:
	Regulated electric	$	361		$	292		$	297
	Regulated gas	40			41			28
	Nonregulated energy	16			16			29
	Total earnings on common stock	$	417		$	349		$	354
		Years Ended December 31,
		2014			2013			2012
	Utility construction expenditures:
	Regulated electric	$	1,429		$	945		$	588
	Regulated gas	97			81			57
	Total utility construction expenditures	$	1,526		$	1,026		$	645
		As of December 31,
		2014			2013			2012
	Total assets:
	Regulated electric	$	11,859		$	10,532		$	9,898
	Regulated gas	1,231			1,206			1,202
	Nonregulated energy	167			131			132
	Total assets	$	13,257		$	11,869		$	11,232

Unaudited_Quarterly_Operating_2

Unaudited Quarterly Operating Results (MEC) (Tables) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Unaudited Quarterly Operating Results [Line Items]
Schedule of Quarterly Financial Information [Table Text Block]
		2014
		1st Quarter		2nd Quarter		3rd Quarter		4th Quarter
		(In millions)
	Operating revenue	$	1,225	$	769	$	862	$	884
	Operating income	153		51		160		58
	Net income	157		32		170		58
	Earnings on common stock	157		32		170		58
		2013
		1st Quarter		2nd Quarter		3rd Quarter		4th Quarter
		(In millions)
	Operating revenue	$	920	$	757	$	826	$	900
	Operating income	106		43		130		77
	Net income	103		24		145		78
	Earnings on common stock	103		23		145		78
	Quarterly data reflect seasonal variations common to a Midwest utility.

Investments_and_Nonregulated_P3

Investments and Nonregulated Property, Net (LLC) (Tables) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Investments and Nonregulated Property, Net [Line Items]
Investments and Nonregulated Property, Net [Table Text Block]	Investments and nonregulated property, net consists of the following amounts as of December 31 (in millions):
		2014		2013
	Nuclear decommissioning trust	$	424	$	394
	Rabbi trusts	177		177
	Auction rate securities	26		23
	Nonregulated property, net of accumulated depreciation of $11 and $11, respectively	21		21
	Other	3		10
	Total	$	651	$	625

Income_Taxes_LLC_Tables

Income Taxes (LLC) (Tables) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Income Tax Disclosure [Line Items]
Components of Income Tax Expense (Benefit) [Table Text Block]	MidAmerican Funding's income tax benefit consists of the following for the years ended December 31 (in millions):
		2014				2013				2012
	Current:
	Federal	$	(404	)		$	(200	)		$	(260	)
	State	(4		)		(12		)		(23		)
		(408		)		(212		)		(283		)
	Deferred:
	Federal	297				100				198
	State	2				3				(21		)
		299				103				177
	Investment tax credits	(1		)		(1		)		(2		)
	Total	$	(110	)		$	(110	)		$	(108	)
Effective Income Tax Rate Reconciliation [Table Text Block]	A reconciliation of the federal statutory income tax rate MidAmerican Funding's the effective income tax rate applicable to income before income tax benefit is as follows for the years ended December 31:
		2014			2013			2012
	Federal statutory income tax rate	35	%		35	%		35	%
	Income tax credits	(61	)		(75	)		(60	)
	State income tax, net of federal income tax benefit	(1	)		(3	)		(12	)
	Income tax method changes	—			—			(6	)
	Effects of ratemaking	(9	)		(3	)		(1	)
	Other, net	(1	)		(2	)		(2	)
	Effective income tax rate	(37	)%		(48	)%		(46	)%
Components of Net Deferred Income Tax Liability [Table Text Block]	MidAmerican Funding's net deferred income tax liability consists of the following as of December 31 (in millions):
		2014				2013
	Deferred income tax assets:
	Regulatory liabilities	$	332			$	351
	Employee benefits	68				61
	Derivative contracts	30				9
	Asset retirement obligations	185				172
	Other	69				72
	Total deferred income tax assets	684				665
	Deferred income tax liabilities:
	Depreciable property	(2,950		)		(2,604		)
	Regulatory assets	(366		)		(304		)
	Other	(25		)		(43		)
	Total deferred income tax liabilities	(3,341		)		(2,951		)
	Net deferred income tax liability	$	(2,657	)		$	(2,286	)
	Reflected as:
	Current assets - other	$	—			$	4
	Deferred income taxes	(2,657		)		(2,290		)
		$	(2,657	)		$	(2,286	)
Net Unrecognized Tax Benefits Roll Forward [Table Text Block]	A reconciliation of the beginning and ending balances of MidAmerican Funding's net unrecognized tax benefits is as follows for the years ended December 31 (in millions):
		2014				2013
	Beginning balance	$	29			$	37
	Additions based on tax positions related to the current year	6				11
	Additions for tax positions of prior years	38				3
	Reductions based on tax positions related to the current year	(4		)		(10		)
	Reductions for tax positions of prior years	(40		)		(9		)
	Statute of limitations	(3		)		(2		)
	Settlements	—				(1		)
	Ending balance	$	26			$	29

Employee_Benefit_Plans_LLC_Tab

Employee Benefit Plans (LLC) (Tables) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Net Benefit Costs [Table Text Block]	Pension and postretirement costs allocated by MidAmerican Funding to its parent and other affiliates in each of the years ended December 31, were as follows (in millions):
		2014			2013			2012
	Pension costs	$	4		$	6		$	5
	Other postretirement costs	(2		)	(2		)	(2		)

Fair_Value_Measurements_LLC_Ta

Fair Value Measurements (LLC) (Tables) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 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 as of December 31 (in millions):
		2014				2013
		Carrying		Fair Value		Carrying		Fair Value
		Value				Value
	Long-term debt	$	4,381	$	5,012	$	3,877	$	4,245

NonOperating_Other_Net_LLC_Tab

Non-Operating Other, Net (LLC) (Tables) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Components of Other Income (Expense), Nonoperating [Line Items]
Schedule of Other Nonoperating Income (Expense) [Table Text Block]	Non-operating income - other, net; as shown on the Consolidated Statements of Operations, includes the following other income (expense) items for the years ended December 31 (in millions):
		2014		2013		2012
	Corporate-owned life insurance income	$	8	$	15	$	9
	Gains on sales of assets and other investments	—		1		2
	Leverage leases	5		2		2
	Other, net	4		3		—
	Total	$	17	$	21	$	13

Supplemental_Cash_Flows_Inform3

Supplemental Cash Flows Information (LLC) (Tables) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]	The summary of supplemental cash flow information as of and for the years ending December 31 is as follows (in millions):
		2014		2013		2012
	Supplemental cash flow information:
	Interest paid, net of amounts capitalized	$	167	$	132	$	147
	Income taxes received, net	$	153	$	42	$	698
	Supplemental disclosure of non-cash investing transactions:
	Accounts payable related to utility plant additions	$	128	$	117	$	122
	Deferred payments on equipment purchased for wind-powered generation	$	—	$	—	$	406
	at MidAmerican Energy(1)
	-1	In conjunction with the construction of wind-powered generating facilities, MidAmerican Energy accrued in gross utility plant in service amounts it was not contractually obligated to pay until a stated future date. Refer to Note 8 for additional information.

Segment_Information_LLC_Tables

Segment Information (LLC) (Tables) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 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 operating 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. Refer to Note 10 for a discussion of income tax method changes and related items affecting income tax (benefit) expense for the regulated electric and gas operating segments.
	The following tables provide information on a reportable segment basis (in millions):
		Years Ended December 31,
		2014			2013			2012
	Operating revenue:
	Regulated electric	$	1,817		$	1,762		$	1,694
	Regulated gas	996			824			659
	Nonregulated energy	927			817			889
	Other	22			10			5
	Total operating revenue	$	3,762		$	3,413		$	3,247
	Depreciation and amortization:
	Regulated electric	$	312		$	366		$	356
	Regulated gas	39			37			36
	Total depreciation and amortization	$	351		$	403		$	392
	Operating income:
	Regulated electric	$	319		$	255		$	270
	Regulated gas	75			74			47
	Nonregulated energy	28			27			53
	Other	1			1			(1		)
	Total operating income	$	423		$	357		$	369
	Fixed charges:
	Regulated electric	$	141		$	129		$	123
	Regulated gas	17			15			15
	Other	23			23			24
	Total fixed charges	$	181		$	167		$	162
	Income tax (benefit) expense:
	Regulated electric	$	(138	)	$	(136	)	$	(129	)
	Regulated gas	22			23			7
	Nonregulated energy	12			10			23
	Other	(6		)	(7		)	(9		)
	Total income tax (benefit) expense	$	(110	)	$	(110	)	$	(108	)
	Net income attributable to MidAmerican Funding:
	Regulated electric	$	361		$	292		$	297
	Regulated gas	40			41			28
	Nonregulated energy	16			16			29
	Other	(8		)	(9		)	(12		)
	Total net income attributable to MidAmerican Funding	$	409		$	340		$	342
	Utility construction expenditures:
	Regulated electric	$	1,429		$	945		$	588
	Regulated gas	97			81			57
	Total utility construction expenditures	$	1,526		$	1,026		$	645
		As of December 31,
		2014			2013			2012
	Total assets:
	Regulated electric	$	13,050		$	11,723		$	11,089
	Regulated gas	1,310			1,285			1,280
	Nonregulated energy	167			131			132
	Other	17			28			29
	Total assets	$	14,544		$	13,167		$	12,530
Schedule of Goodwill [Table Text Block]	Goodwill by reportable segment as of December 31, 2014 and 2013, was as follows (in millions):
	Regulated electric	$	1,191
	Regulated gas	79
	Total	$	1,270

Unaudited_Quarterly_Operating_3

Unaudited Quarterly Operating Results (LLC) (Tables) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Unaudited Quarterly Operating Results [Line Items]
Schedule of Quarterly Financial Information [Table Text Block]
		2014
		1st Quarter		2nd Quarter		3rd Quarter		4th Quarter
		(In millions)
	Operating revenue	$	1,230	$	775	$	864	$	893
	Operating income	153		51		161		58
	Net income	155		30		168		56
	Net income attributable to MidAmerican Funding	155		30		168		56
		2013
		1st Quarter		2nd Quarter		3rd Quarter		4th Quarter
		(In millions)
	Operating revenue	$	921	$	759	$	828	$	905
	Operating income	106		43		130		78
	Net income	100		22		143		76
	Net income attributable to MidAmerican Funding	100		21		143		76
	Quarterly data reflect seasonal variations common to a Midwest utility.

Summary_of_Significant_Account5

Summary of Significant Accounting Policies (MEC) Allowance for Doubtful Accounts (Details) (MidAmerican Energy Company [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
MidAmerican Energy Company [Member]
Notes to Financial Statements [Line Items]
Allowance for Doubtful Accounts Receivable, Current	$7	$10

Summary_of_Significant_Account6

Summary of Significant Accounting Policies (MEC) Inventories (Details) (MidAmerican Energy Company [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
MidAmerican Energy Company [Member]
Notes to Financial Statements [Line Items]
Materials and supplies inventory	$101	$95
Coal inventory	54	109
Natural gas storage inventory	24	19
Replacement cost of natural gas storage inventory	$41	$36

Summary_of_Significant_Account7

Summary of Significant Accounting Policies (MEC) Utility Plant, Net - General (Details) (MidAmerican Energy Company [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Regulated electric [Member]
Notes to Financial Statements [Line Items]
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service	2.80%	3.30%	3.30%
Regulated gas [Member]
Notes to Financial Statements [Line Items]
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service	2.80%	2.80%	2.80%
Service Life [Member]
Notes to Financial Statements [Line Items]
Change in Accounting Estimates, Impact on Period of Change	50		5
Change in Accounting Estimates, Impact on Future Periods			11
Electricity Generation Plant, Non-Nuclear [Member]
Notes to Financial Statements [Line Items]
Change in Accounting Estimates, Impact on Period of Change		20
Change in Accounting Estimates, Impact on Future Periods		49

Summary_of_Significant_Account8

Summary of Significant Accounting Policies (MEC) Revenue Recognition (Details) (MidAmerican Energy Company [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
MidAmerican Energy Company [Member]
Notes to Financial Statements [Line Items]
Unbilled revenue receivable	$131	$145
Adjustment clauses and bill rider accounts receivable	$25	$49

Summary_of_Significant_Account9

Summary of Significant Accounting Policies (MEC) Income Taxes (Details) (MidAmerican Energy Company [Member], USD $)	Dec. 31, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Notes to Financial Statements [Line Items]
Regulatory Assets, Noncurrent	$908		$748
Deferred Income Tax Charges [Member]
Notes to Financial Statements [Line Items]
Regulatory Assets, Noncurrent	$730	[1]	$649	[1]
[1]	Amounts primarily represent income tax benefits related to state accelerated tax depreciation and certain property-related basis differences that were previously flowed through to customers and will be included in regulated rates when the temporary differences reverse.

Jointly_Owned_Utility_Faciliti3

Jointly Owned Utility Facilities (MEC) (Details) (MidAmerican Energy Company [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	$3,876
Accumulated Depreciation and Amortization	1,612
Construction Work in Progress	63
Louisa Unit No. 1 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Company Share	88.00%
Plant in Service	747
Accumulated Depreciation and Amortization	392
Construction Work in Progress	4
Quad Cities Unit Nos. 1 & 2 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Company Share	25.00%	[1]
Plant in Service	656	[1]
Accumulated Depreciation and Amortization	316	[1]
Construction Work in Progress	27	[1]
Walter Scott, Jr. Unit No. 3 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Company Share	79.10%
Plant in Service	561
Accumulated Depreciation and Amortization	287
Construction Work in Progress	7
Walter Scott, Jr. Unit No. 4 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Company Share	59.70%	[2]
Plant in Service	446	[2]
Accumulated Depreciation and Amortization	82	[2]
Construction Work in Progress	3	[2]
Revenue Sharing Credits Netted Against Facility In Service	320
Revenue Sharing Credits Netted Against Accumulated Depreciation	60
George Neal Unit No. 4 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Company Share	40.60%
Plant in Service	303
Accumulated Depreciation and Amortization	142
Construction Work in Progress	0
Ottumwa Unit No. 1 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Company Share	52.00%
Plant in Service	530
Accumulated Depreciation and Amortization	171
Construction Work in Progress	2
George Neal Unit No. 3 [Member]
Jointly Owned Utility Plant Interests [Line Items]
Company Share	72.00%
Plant in Service	390
Accumulated Depreciation and Amortization	141
Construction Work in Progress	3
Transmission facilities [Member]
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	243	[3]
Accumulated Depreciation and Amortization	81	[3]
Construction Work in Progress	$17	[3]
Jointly Owned Utility Plant Proportionate Ownership Percentage Share	Various	[3]
[1]	Includes amounts related to nuclear fuel.
[2]	Plant in service and accumulated depreciation and amortization amounts are net of credits applied under Iowa revenue sharing arrangements totaling $320 million and $60 million, respectively.
[3]	Includes 345 and 161B kilovolt transmission lines and substations.

Regulatory_Matters_MEC_Assets_

Regulatory Matters (MEC) Assets (Details) (MidAmerican Energy Company [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Regulatory Assets [Line Items]
Regulatory assets	$908		$748
Regulatory assets not earning a return on investment	904		743
Deferred income taxes, net [Member]
Regulatory Assets [Line Items]
Regulatory assets	730	[1]	649	[1]
Average Remaining Life	24 years
Asset retirement obligations [Member]
Regulatory Assets [Line Items]
Regulatory assets	62	[2]	34	[2]
Average Remaining Life	12 years
Employee benefit plans [Member]
Regulatory Assets [Line Items]
Regulatory assets	42	[3]	26	[3]
Average Remaining Life	10 years
Unrealized loss on regulated derivative contracts [Member]
Regulatory Assets [Line Items]
Regulatory assets	38		10
Average Remaining Life	1 year
Other [Member]
Regulatory Assets [Line Items]
Regulatory assets	$36		$29
Regulatory asset amortization period years	Various
[1]	Amounts primarily represent income tax benefits related to state accelerated tax depreciation and certain property-related basis differences that were previously flowed through to customers and will be included in regulated rates when the temporary differences reverse.
[2]	(2)Amount predominantly relates to asset retirement obligations for fossil-fueled and wind-powered generating facilities. Refer to NoteB 12 for a discussion of asset retirement obligations.
[3]	Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in regulated rates when recognized.

Regulatory_Matters_MEC_Liabili

Regulatory Matters (MEC) Liabilities (Details) (MidAmerican Energy Company [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	$837		$875
Cost of removal accrual [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	642	[1]	649	[1]
Average Remaining Life	24 years
Asset retirement obligations [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	159	[2]	140	[2]
Average Remaining Life	23 years
Employee benefit plans [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	5	[3]	55	[3]
Average Remaining Life	10 years
Other [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability, Noncurrent	$31		$31
Regulatory liability amortization period years	Various
[1]	Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing utility plant in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying cost.
[2]	Amount predominantly represents the excess of nuclear decommission trust assets over the related asset retirement obligation. Refer to NoteB 12 for a discussion of asset retirement obligations.
[3]	Represents amounts not yet recognized as a component of net periodic benefit cost that are to be returned to customers in future periods when recognized.

Investments_and_Nonregulated_P4

Investments and Nonregulated Property, Net (MEC) (Details) (MidAmerican Energy Company [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Investments and Nonregulated Property, Net [Line Items]
Nuclear decommissioning trust	$424	$394
Rabbi trusts	175	172
Auction rate securities	26	23
Nonregulated property, net of accumulated depreciation of $5 and $5, respectively	9	9
Total	634	598
Nonregulated property accumulated depreciation	5	5
Depreciable life of computer software	5 years
Auction rate securities [Member]
Investments and Nonregulated Property, Net [Line Items]
Auction rate securities, par amount	35	35
Other than temporary impairment on auction rate securities	3
Unrealized loss on auction rate securities, net of tax	$3	$4
Auction rate securities [Member] | Minimum [Member]
Investments and Nonregulated Property, Net [Line Items]
Remaining maturity years	3 years
Auction rate securities [Member] | Maximum [Member]
Investments and Nonregulated Property, Net [Line Items]
Remaining maturity years	21 years
Domestic common equity securities [Member]
Investments and Nonregulated Property, Net [Line Items]
Nuclear decommissioning trust fund ownership percentage	56.00%	54.00%
United States government securities [Member]
Investments and Nonregulated Property, Net [Line Items]
Nuclear decommissioning trust fund ownership percentage	32.00%	34.00%
Domestice corporate debt securities [Member]
Investments and Nonregulated Property, Net [Line Items]
Nuclear decommissioning trust fund ownership percentage	9.00%	9.00%
Other securities [Member]
Investments and Nonregulated Property, Net [Line Items]
Nuclear decommissioning trust fund ownership percentage	3.00%	3.00%

Components_of_Accumulated_Othe3

Components of Accumulated Other Comprehensive Loss, Net (MEC) (Details) (MidAmerican Energy Company [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Loss, Net [Roll Forward]
Other comprehensive income, unrealized gains on available-for-sale securities	$1	$1	$3
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges	-13	12	7
Other comprehensive income (loss)	-12	13	10
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Loss, Net [Roll Forward]
Beginning Balance, Unrealized Losses on Available-For-Sale Securities	-4	-5
Beginning Balance, Unrealized Losses on Cash Flow Hedges	-7	-19
Beginning Balance, Accumulated Other Comprehensive Loss, Net	-11	-24
Other comprehensive income, unrealized gains on available-for-sale securities	1	1
Other comprehensive income (loss), unrealized gains (losses) on cash flow hedges	-13	12
Other comprehensive income (loss)	-12	13	10
Ending Balance, Unrealized Losses on Available-For-Sale Securities	-3	-4	-5
Ending Balance, Unrealized Losses on Cash Flow Hedges	-20	-7	-19
Beginning Balance, Accumulated Other Comprehensive Loss, Net	($23)	($11)	($24)

Preferred_Securities_MEC_Detai

Preferred Securities (MEC) (Details) (MidAmerican Energy Company [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013
MidAmerican Energy Company [Member]
Class of Stock [Line Items]
Redemption of preferred securities	$28

Longterm_Debt_MEC_Details

Long-term Debt (MEC) (Details) (MidAmerican Energy Company [Member], USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
MidAmerican Energy Company [Member]
Debt Instrument [Line Items]
2015 long-term debt maturities repayments	$426
2016 long-term debt maturities repayments	34
2017 long-term debt maturities repayments	254
2018 long-term debt maturities repayments	350
2019 long-term debt maturities repayments	500
2020 and thereafter long-term debt maturities repayments	$2,507

Longterm_Debt_MEC_Longterm_Deb

Long-term Debt (MEC) Long-term Debt Narrative (Details) (MidAmerican Energy Company [Member], USD $)	12 Months Ended
	Dec. 31, 2014	31-May-14	Apr. 30, 2014
Debt Instrument [Line Items]
Eligible Property Subject To Lien Of Mortgages	12,000,000,000
Committed Common Equity Percentage To Regulators [Member]
Debt Instrument [Line Items]
Common equity to total capitalization percentage	42.00%
Committed Common Equity Percentage To Regulators Beyond Companies Control [Member]
Debt Instrument [Line Items]
Common equity to total capitalization percentage below which reasonable efforts to maintain agreed to percentage is not required	39.00%
Common Equity Level To Total Capitalization [Member]
Debt Instrument [Line Items]
Actual common equity to total capitalization percentage	51.00%
Dividend Restriction For Common Equity Commitment [Member]
Debt Instrument [Line Items]
Amount Available for Dividend Distribution without Affecting Capital Adequacy Requirements	1,300,000,000
MidAmerican Energy Company [Member] | Notes, 4.65% Series, due 2014 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount		350,000,000
Debt Instrument, Interest Rate, Stated Percentage		4.65%
MidAmerican Energy Company [Member] | First Mortgage Bonds Issued April 2014 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$850,000,000

Shortterm_Debt_and_Revolving_C2

Short-term Debt and Revolving Credit Facilities (MEC) (Details) (USD $)	12 Months Ended	1 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Commercial Paper [Member]
Line of Credit Facility [Line Items]
Short-term debt, weighted average interest rate	0.35%
MidAmerican Energy Company [Member]
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity	$605		$605
Short-term debt	-50		0
Credit facility, amount supported	-195		-195
Credit facility, remaining borrowing capacity	360		410
MidAmerican Energy Company [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Required debt to capitalization ratio	0.65
MidAmerican Energy Company [Member] | Commercial Paper [Member]
Line of Credit Facility [Line Items]
Credit facility, expiration date	30-Jun-16
Regulatory approval for additional short-term debt issuances	605
MidAmerican Energy Company [Member] | Unsecured credit facility, $600 million, expiring March 2018 [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity		600
Credit facility, expiration date		27-Mar-18
MidAmerican Energy Company [Member] | Unsecured 364-day Credit Facility, $5 million, expiring June 2015 [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity	$5
Credit facility, expiration date	30-Jun-15

Income_Taxes_MEC_Components_of

Income Taxes (MEC) Components of Income Tax Expense (Benefit) (Details) (MidAmerican Energy Company [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
MidAmerican Energy Company [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Current federal	($401)	($196)	($256)
Current state	-3	-10	-21
Total current income tax expense (benefit)	-404	-206	-277
Deferred federal	299	101	200
Deferred state	2	3	-20
Total deferred income tax expense (benefit)	301	104	180
Investment tax credits	-1	-1	-2
Income tax expense (benefit)	($104)	($103)	($99)

Income_Taxes_MEC_Reconciliatio

Income Taxes (MEC) Reconciliation of Effective Income Tax Rate (Details) (MidAmerican Energy Company [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	35.00%	35.00%	35.00%
Income tax credits	-59.00%	-70.00%	-56.00%
State income tax, net of federal income tax benefit	0.00%	-2.00%	-10.00%
Income tax method changes	0.00%	0.00%	-6.00%
Effects of ratemaking	-8.00%	-3.00%	0.00%
Other, net	-1.00%	-2.00%	-2.00%
Effective income tax rate	-33.00%	-42.00%	-39.00%
Production Tax Credit Carryforwards [Abstract]
Years eligible for renewable energy production tax credit	10 years
Repairs deduction [Member]
Income tax method change [Abstract]
Income tax benefits from tax method change		16

Income_Taxes_MEC_Components_of1

Income Taxes (MEC) Components of Net Deferred Income Tax Liability (Details) (MidAmerican Energy Company [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred income tax assets: [Abstract]
Regulatory liabilities	332	$351
Employee benefits	68	61
Derivative contracts	30	9
Asset retirement obligations	185	172
Other	58	60
Total deferred income tax assets	673	653
Deferred income tax Liabilities: [Abstract]
Depreciable property	-2,945	-2,599
Regulatory assets	-366	-304
Other	-25	-40
Total deferred income tax liabilities	-3,336	-2,943
Net deferred income tax liabilities	-2,663	-2,290
Reflected as: [Abstract]
Current assets - other	0	4
Deferred income taxes	-2,663	-2,294
Minimum [Member]
Summary of Tax Credit Carryforwards [Abstract]
Domestic carryforwards expiration date	2015
Maximum [Member]
Summary of Tax Credit Carryforwards [Abstract]
Domestic carryforwards expiration date	2033
State and Local [Member]
Summary of Tax Credit Carryforwards [Abstract]
State carryforwards	20
Net operating loss carryforwards	429

Income_Taxes_MEC_Net_Unrecogni

Income Taxes (MEC) Net Unrecognized Tax Benefits (Details) (MidAmerican Energy Company [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
MidAmerican Energy Company [Member]
Net Unrecognized Tax Benefits [Line Items]
Unrecognized tax benefits that would impact the effective tax rate	$26	$29
Reconciliation of Net Unrecognized Tax Benefits [Roll Forward]
Beginning balance	29	36
Additions based on tax positions related to current year	6	10
Additions for tax positions of prior years	38	3
Reductions based on tax positions related to the current year	-4	-10
Reductions for tax positions of prior years	-40	-8
Statute of limitations	-3	-2
Ending balance	$26	$29

Employee_Benefit_Plans_MEC_Pla

Employee Benefit Plans (MEC) Plan Amendments (Details) (MidAmerican Energy Company [Member], United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
MidAmerican Energy Company [Member] | United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost	($2)	($3)	($4)

Employee_Benefit_Plans_MEC_Net

Employee Benefit Plans (MEC) Net Periodic Benefit Cost (Details) (MidAmerican Energy Company [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$14	$18	$18
Interest cost	35	33	37
Expected return on plan assets	-45	-45	-45
Net amortization	1	11	4
Net periodic benefit cost (benefit)	5	17	14
United States Pension Plans of US Entity, Defined Benefit [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (benefit)	1	11	8
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	5	4
Interest cost	10	8	8
Expected return on plan assets	-15	-13	-13
Net amortization	-3	-3	-3
Net periodic benefit cost (benefit)	-2	-3	-4
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (benefit)	$0	($1)	($2)

Employee_Benefit_Plans_MEC_Fun

Employee Benefit Plans (MEC) Funded Status (Details) (MidAmerican Energy Company [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plans, Supplemental Employee Retirement Plans [Abstract]
Rabbi trusts insurance policies and investments	$175	$172
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of defined benefit plan assets, beginning of year	722	643
Employer contributions	7	7
Participant contributions	0	0
Actual return on plan assets	52	142
Benefits paid	-51	-70
Fair value of defined benefit plan assets, end of year	730	722	643
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning of year	768	846
Service cost	14	18	18
Interest cost	35	33	37
Participant contributions	0	0
Actuarial loss (gain)	74	-59
Benefits paid	-51	-70
Benefit obligation, end of year	840	768	846
Accumulated benefit obligation, end of year	825	751
Defined Benefit Plan, Funded Status of Plan [Abstract]
Fair value of defined benefit plan assets, end of year	730	722	643
Less - Benefit obligation, end of year	840	768	846
Funded status	-110	-46
Other assets	12	66
Other current liabilities	-8	-8
Other liabilities	-114	-104
Amounts recognized	-110	-46
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of defined benefit plan assets, beginning of year	256	226
Employer contributions	1	1
Participant contributions	1	1
Actual return on plan assets	13	40
Benefits paid	-12	-12
Fair value of defined benefit plan assets, end of year	259	256	226
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning of year	235	213
Service cost	6	5	4
Interest cost	10	8	8
Participant contributions	1	1
Actuarial loss (gain)	9	20
Benefits paid	-12	-12
Benefit obligation, end of year	249	235	213
Defined Benefit Plan, Funded Status of Plan [Abstract]
Fair value of defined benefit plan assets, end of year	259	256	226
Less - Benefit obligation, end of year	249	235	213
Funded status	10	21
Other assets	10	21
Other current liabilities	0	0
Other liabilities	0	0
Amounts recognized	10	21
Supplemental Employee Retirement Plans, Defined Benefit [Member] | BHE [Member]
Defined Benefit Plans, Supplemental Employee Retirement Plans [Abstract]
Rabbi trusts insurance policies and investments	156	149
Supplemental Employee Retirement Plans, Defined Benefit [Member] | MidAmerican Energy Company [Member]
Defined Benefit Plans, Supplemental Employee Retirement Plans [Abstract]
Rabbi trusts insurance policies and investments	$103	$98

Employee_Benefit_Plans_MEC_Unr

Employee Benefit Plans (MEC) Unrecognized Amounts (Details) (MidAmerican Energy Company [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Amortization of net loss	$3
Amortization of prior service cost (credit), net	-4
Amounts that will be amortized from regulatory assets (liabilities) in 2014	-1
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Net (gain) loss	21	-44
Prior service costs (credit)	3	3
Total net periodic benefit cost (benefit) not yet recognized	24	-41	125
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Net (gain) loss arising during the year	66	-155
Net amortization	-1	-11
Net periodic benefit cost (benefit) not yet recognized, arising during the year	65	-166
Amortization of net loss	1
Amortization of prior service cost (credit), net	1
Amounts that will be amortized from regulatory assets (liabilities) in 2014	2
United States Pension Plans of US Entity, Defined Benefit [Member] | Regulatory Asset [Member]
Defined Benefit Plan Disclosure [Line Items]
Total net periodic benefit cost (benefit) not yet recognized	22	16	110
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Net (gain) loss arising during the year	6	-91
Net amortization	0	-3
Net periodic benefit cost (benefit) not yet recognized, arising during the year	6	-94
United States Pension Plans of US Entity, Defined Benefit [Member] | Regulatory Liability [Member]
Defined Benefit Plan Disclosure [Line Items]
Total net periodic benefit cost (benefit) not yet recognized	-5	-55	0
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Net (gain) loss arising during the year	51	-49
Net amortization	-1	-6
Net periodic benefit cost (benefit) not yet recognized, arising during the year	50	-55
United States Pension Plans of US Entity, Defined Benefit [Member] | Receivables (Payables) with Affiliates [Member]
Defined Benefit Plan Disclosure [Line Items]
Total net periodic benefit cost (benefit) not yet recognized	7	-2	15
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Net (gain) loss arising during the year	9	-15
Net amortization	0	-2
Net periodic benefit cost (benefit) not yet recognized, arising during the year	9	-17
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Net (gain) loss	49	41
Prior service costs (credit)	-42	-47
Total net periodic benefit cost (benefit) not yet recognized	7	-6	-2
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Net (gain) loss arising during the year	10	-7
Net amortization	3	3
Net periodic benefit cost (benefit) not yet recognized, arising during the year	13	-4
Amortization of net loss	2
Amortization of prior service cost (credit), net	-5
Amounts that will be amortized from regulatory assets (liabilities) in 2014	-3
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Regulatory Asset [Member]
Defined Benefit Plan Disclosure [Line Items]
Total net periodic benefit cost (benefit) not yet recognized	20	10	11
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Net (gain) loss arising during the year	8	-3
Net amortization	2	2
Net periodic benefit cost (benefit) not yet recognized, arising during the year	10	-1
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Regulatory Liability [Member]
Defined Benefit Plan Disclosure [Line Items]
Total net periodic benefit cost (benefit) not yet recognized	0	0	0
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Net (gain) loss arising during the year	0	0
Net amortization	0	0
Net periodic benefit cost (benefit) not yet recognized, arising during the year	0	0
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Receivables (Payables) with Affiliates [Member]
Defined Benefit Plan Disclosure [Line Items]
Total net periodic benefit cost (benefit) not yet recognized	-13	-16	-13
Defined Benefit Plan, Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Net (gain) loss arising during the year	2	-4
Net amortization	1	1
Net periodic benefit cost (benefit) not yet recognized, arising during the year	$3	($3)

Employee_Benefit_Plans_MEC_Pla1

Employee Benefit Plans (MEC) Plan Assumptions (Details) (MidAmerican Energy Company [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumptions Used Calculating Benefit Obligation, Discount Rate	4.00%		4.75%		4.00%
Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	2.75%		3.00%		3.00%
Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.75%		4.00%		4.75%
Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	7.50%	[1]	7.50%	[1]	7.50%	[1]
Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	3.00%		3.00%		3.50%
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumptions Used Calculating Benefit Obligation, Discount Rate	3.75%		4.50%		3.75%
Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.50%		3.75%		4.75%
Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	7.25%	[1]	7.25%	[1]	7.50%	[1]
Health Care Cost Trend Rate Assumed for Next Fiscal Year	8.00%		8.00%
Ultimate Health Care Cost Trend Rate	5.00%		5.00%
Year that Rate Reaches Ultimate Trend Rate	2025		2019
Effect of One Percentage Point Increase on Service and Interest Cost Components	1
Effect of One Percentage Point Decrease on Service and Interest Cost Components	0
Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation	5
Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation	-4
United States Non-Union Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	5.37%		5.56%		5.75%
[1]	(1)Amounts reflected are pre-tax values. Assumed after-tax returns for a taxable, non-union other postretirement plan were 5.37% for 2014, and 5.56% for 2013, and 5.75% for 2012.

Employee_Benefit_Plans_MEC_Con

Employee Benefit Plans (MEC) Contributions and Benefit Payments (Details) (MidAmerican Energy Company [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions in 2015	$8
Expected future benefit payments in 2015	54
Expected future benefit payments in 2016	58
Expected future benefit payments in 2017	59
Expected future benefit payments in 2018	59
Expected future benefit payments in 2019	60
Expected future benefit payments, 2020-2024	298
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions in 2015	1
Expected future benefit payments in 2015	16
Expected future benefit payments in 2016	17
Expected future benefit payments in 2017	19
Expected future benefit payments in 2018	20
Expected future benefit payments in 2019	21
Expected future benefit payments, 2020-2024	$109

Employee_Benefit_Plans_MEC_Ass

Employee Benefit Plans (MEC) Asset Allocations (Details) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
United States Pension Plans of US Entity, Defined Benefit [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocations (percentage of plan assets) - minimum	20.00%	[1]
Target allocations (percentage of plan assets) - maximum	40.00%	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocations (percentage of plan assets) - minimum	60.00%	[1]
Target allocations (percentage of plan assets) - maximum	80.00%	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Real estate funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocations (percentage of plan assets) - minimum	2.00%
Target allocations (percentage of plan assets) - maximum	8.00%
United States Pension Plans of US Entity, Defined Benefit [Member] | Other securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocations (percentage of plan assets) - minimum	0.00%
Target allocations (percentage of plan assets) - maximum	5.00%
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocations (percentage of plan assets) - minimum	25.00%	[1]
Target allocations (percentage of plan assets) - maximum	45.00%	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocations (percentage of plan assets) - minimum	50.00%	[1]
Target allocations (percentage of plan assets) - maximum	80.00%	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Real estate funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocations (percentage of plan assets) - minimum	0.00%
Target allocations (percentage of plan assets) - maximum	0.00%
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Other securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocations (percentage of plan assets) - minimum	0.00%
Target allocations (percentage of plan assets) - maximum	5.00%
[1]	For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds are allocated based on the underlying investments in debt and equity securities.

Employee_Benefit_Plans_MEC_Fai

Employee Benefit Plans (MEC) Fair Value Measurements (Details) (MidAmerican Energy Company [Member], USD $)	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
In Millions, unless otherwise specified
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	$730		$722		$643
United States Pension Plans of US Entity, Defined Benefit [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	281	[1]	330	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	409	[1]	361	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	40	[1]	31	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	24		10
United States Pension Plans of US Entity, Defined Benefit [Member] | Cash Equivalents [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Cash Equivalents [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	24	[1]	10	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Cash Equivalents [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | United States government obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	8		10
United States Pension Plans of US Entity, Defined Benefit [Member] | United States government obligations [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	8	[1]	10	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | United States government obligations [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | United States government obligations [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	29		30
United States Pension Plans of US Entity, Defined Benefit [Member] | Corporate Debt Securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Corporate Debt Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	29	[1]	30	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Corporate Debt Securities [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Municipal obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	4		5
United States Pension Plans of US Entity, Defined Benefit [Member] | Municipal obligations [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Municipal obligations [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	4	[1]	5	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Municipal obligations [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Agency, asset and mortgage-backed obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	33		31
United States Pension Plans of US Entity, Defined Benefit [Member] | Agency, asset and mortgage-backed obligations [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Agency, asset and mortgage-backed obligations [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	33	[1]	31	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Agency, asset and mortgage-backed obligations [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | United States companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	149		163
United States Pension Plans of US Entity, Defined Benefit [Member] | United States companies [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	149	[1]	163	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | United States companies [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | United States companies [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | International companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	40		52
United States Pension Plans of US Entity, Defined Benefit [Member] | International companies [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	40	[1]	52	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | International companies [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | International companies [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Investment funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	403	[2]	390	[2]
Percentage of Investment Funds Comprised Of Equity Securitites	68.00%		78.00%
Percentage of Investment Funds Comprised Of Debt Securities	32.00%		22.00%
Percentage Of Investment Funds Invested in United States Securities	74.00%		80.00%
Percentage Of Investment Funds Invested In International Securities	26.00%		20.00%
United States Pension Plans of US Entity, Defined Benefit [Member] | Investment funds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	84	[1],[2]	105	[1],[2]
United States Pension Plans of US Entity, Defined Benefit [Member] | Investment funds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	319	[1],[2]	285	[1],[2]
United States Pension Plans of US Entity, Defined Benefit [Member] | Investment funds [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1],[2]	0	[1],[2]
United States Pension Plans of US Entity, Defined Benefit [Member] | Real estate funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	40		31
United States Pension Plans of US Entity, Defined Benefit [Member] | Real estate funds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Real estate funds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1]	0	[1]
United States Pension Plans of US Entity, Defined Benefit [Member] | Real estate funds [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	40	[1]	31	[1]	26	24
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	259		256		226
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	193		197
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	66		59
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0		0
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	4		1
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Cash Equivalents [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	4	[1]	1	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Cash Equivalents [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1]	0	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Cash Equivalents [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1]	0	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | United States government obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	5		7
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | United States government obligations [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	5	[1]	7	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | United States government obligations [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1]	0	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | United States government obligations [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1]	0	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	11		9
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Corporate Debt Securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1]	0	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Corporate Debt Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	11	[1]	9	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Corporate Debt Securities [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1]	0	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Municipal obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	40		37
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Municipal obligations [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1]	0	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Municipal obligations [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	40	[1]	37	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Municipal obligations [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1]	0	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Agency, asset and mortgage-backed obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	15		13
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Agency, asset and mortgage-backed obligations [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1]	0	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Agency, asset and mortgage-backed obligations [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	15	[1]	13	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Agency, asset and mortgage-backed obligations [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1]	0	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | United States companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	128		125
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | United States companies [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	128	[1]	125	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | United States companies [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1]	0	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | United States companies [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1]	0	[1]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Investment funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	56	[3]	64	[3]
Percentage of Investment Funds Comprised Of Equity Securitites	69.00%		86.00%
Percentage of Investment Funds Comprised Of Debt Securities	31.00%		14.00%
Percentage Of Investment Funds Invested in United States Securities	31.00%		43.00%
Percentage Of Investment Funds Invested In International Securities	69.00%		57.00%
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Investment funds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	56	[1],[3]	64	[1],[3]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Investment funds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	0	[1],[3]	0	[1],[3]
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] | Investment funds [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of defined benefit plan assets, end of year	$0	[1],[3]	$0	[1],[3]
[1]	(1)Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy.
[2]	(2)Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 68% and 32%, respectively, for 2014 and 78% and 22%, respectively, for 2013. Additionally, these funds are invested in United States and international securities of approximately 74% and 26%, respectively, for 2014 and 80% and 20%, respectively, for 2013.
[3]	(2)Investment funds are comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 69% and 31%, respectively, for 2014 and 86% and 14%, respectively, for 2013. Additionally, these funds are invested in United States and international securities of approximately 31% and 69%, respectively, for 2014 and 43% and 57%, respectively, for 2013.

Employee_Benefit_Plans_MEC_Lev

Employee Benefit Plans (MEC) Level 3 Rollforward (Details) (MidAmerican Energy Company [Member], United States Pension Plans of US Entity, Defined Benefit [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of defined benefit plan assets, end of year	$730		$722		$643
Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of defined benefit plan assets, end of year	40	[1]	31	[1]
Real estate funds [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of defined benefit plan assets, end of year	40		31
Real estate funds [Member] | Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of defined benefit plan assets, beginning of year	31	[1]	26		24
Actual return on plan assets still held at period end	4		5		2
Purchases and sales	5		0		0
Fair value of defined benefit plan assets, end of year	$40	[1]	$31	[1]	$26
[1]	(1)Refer to Note 14 for additional discussion regarding the three levels of the fair value hierarchy.

Employee_Benefit_Plans_MEC_Def

Employee Benefit Plans (MEC) Defined Contribution Plans (Details) (MidAmerican Energy Company [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
MidAmerican Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Cost Recognized	$19	$17	$16

Asset_Retirement_Obligations_M2

Asset Retirement Obligations (MEC) By Type (Details) (MidAmerican Energy Company [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Asset Retirement Obligations By Type [Line Items]
Total asset retirement obligations	$460	$430	$318
Quad Cities Station nuclear decommissioning trust funds	424	394
Quad Cities Unit Nos. 1 & 2 [Member]
Asset Retirement Obligations By Type [Line Items]
Quad Cities Station nuclear decommissioning trust funds	424	394
Quad Cities Unit Nos. 1 & 2 [Member]
Asset Retirement Obligations By Type [Line Items]
Total asset retirement obligations	265	254
Fossil-fueled generating facilities [Member]
Asset Retirement Obligations By Type [Line Items]
Total asset retirement obligations	132	127
Wind-powered generating facilities [Member]
Asset Retirement Obligations By Type [Line Items]
Total asset retirement obligations	60	45
Other [Member]
Asset Retirement Obligations By Type [Line Items]
Total asset retirement obligations	3	4
Cost of removal accrual [Member]
Asset Retirement Obligations By Type [Line Items]
Regulatory Liabilities	$642	$649

Change_In_Asset_Retirement_Obl

Change In Asset Retirement Obligations (Details) (MidAmerican Energy Company [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance	$430	$318
Change in estimate costs	-2	88
Additions	11	5
Accretion	21	19
Ending balance	460	430
Reflected as: [Abstract]
Other current liabilities	28	0
Asset retirement obligations	432	430
Total ARO liability	460	430
Fossil-fueled generating facilities [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance	127
Change in estimate costs	98
Ending balance	132
Reflected as: [Abstract]
Total ARO liability	$132

Risk_Management_and_Hedging_Ac3

Risk Management and Hedging Activities (MEC) Balance Sheet Location (Details) (MidAmerican Energy Company [Member], Commodity Contract [Member], USD $)	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
In Millions, unless otherwise specified
Derivatives, Fair Value [Line Items]
Total derivative, assets (liabilities), net	($74)		($27)
Cash collateral, net receivable (payable), offset against derivative positions	47		0
Total derivative, net of collateral	-27		-27
Current Assets - Other [Member]
Derivatives, Fair Value [Line Items]
Total derivative, assets (liabilities), net	14		2
Cash collateral, net receivable (payable), offset against derivative positions	0		-2
Total derivative, net of collateral	14		0
Other Assets - Other [Member]
Derivatives, Fair Value [Line Items]
Total derivative, assets (liabilities), net	3		2
Cash collateral, net receivable (payable), offset against derivative positions	0		0
Total derivative, net of collateral	3		2
Current Liabilities - Other [Member]
Derivatives, Fair Value [Line Items]
Total derivative, assets (liabilities), net	-73		-20
Cash collateral, net receivable (payable), offset against derivative positions	42		1
Total derivative, net of collateral	-31		-19
Other Liabilities - Other [Member]
Derivatives, Fair Value [Line Items]
Total derivative, assets (liabilities), net	-18		-11
Cash collateral, net receivable (payable), offset against derivative positions	5		1
Total derivative, net of collateral	-13		-10
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	37	[1]	23	[1]
Commodity liability	-73	[1]	-40	[1]
Total derivative, assets (liabilities), net	-36	[1]	-17	[1]
Net regulatory asset	38		10		45	73
Not Designated as Hedging Instrument [Member] | Current Assets - Other [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	14	[1]	3	[1]
Commodity liability	0	[1]	-1	[1]
Total derivative, assets (liabilities), net	14	[1]	2	[1]
Not Designated as Hedging Instrument [Member] | Other Assets - Other [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	3	[1]	3	[1]
Commodity liability	0	[1]	-1	[1]
Total derivative, assets (liabilities), net	3	[1]	2	[1]
Not Designated as Hedging Instrument [Member] | Current Liabilities - Other [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	19	[1]	16	[1]
Commodity liability	-69	[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	1	[1]	1	[1]
Commodity liability	-4	[1]	-6	[1]
Total derivative, assets (liabilities), net	-3	[1]	-5	[1]
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	6		2
Commodity liability	-44		-12
Total derivative, assets (liabilities), net	-38		-10
Designated as Hedging Instrument [Member] | Current Assets - Other [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	0		1
Commodity liability	0		-1
Total derivative, assets (liabilities), net	0		0
Designated as Hedging Instrument [Member] | Other Assets - Other [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	0		0
Commodity liability	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	4		1
Commodity liability	-27		-5
Total derivative, assets (liabilities), net	-23		-4
Designated as Hedging Instrument [Member] | Other Liabilities - Other [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	2		0
Commodity liability	-17		-6
Total derivative, assets (liabilities), net	($15)		($6)
[1]	MidAmerican Energy's commodity derivatives not designated as hedging contracts are generally included in regulated rates. Accordingly, as of DecemberB 31, 2014 and 2013, a net regulatory asset of $38 million and $10 million, respectively, was recorded related to the net derivative liability of $36B 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], Commodity Contract [Member], Not Designated as Hedging Instrument [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
MidAmerican Energy Company [Member] | Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]
Regulatory Assets (Liabilities), Net, Derivatives [Roll Forward]
Beginning balance	$10	$45	$73
Changes in fair value recognized in net regulatory assets	61	5	14
Net (losses) gains reclassified to operating revenue	-28	-1	21
Net (losses) gains reclassified to cost of fuel, energy and capacity	-1	-1	2
Net losses reclassified to cost of gas sold	-4	-38	-65
Ending balance	$38	$10	$45

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 $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments, unrealized gain (loss) recognized in income, net	$15	($2)	$4
Nonregulated operating revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments, unrealized gain (loss) recognized in income, net	6	0	8
Nonregulated cost of sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments, unrealized gain (loss) recognized in income, net	$9	($2)	($4)

Risk_Management_and_Hedging_Ac6

Risk Management and Hedging Activities (MEC) Designated As Hedging Contracts (Details) (MidAmerican Energy Company [Member], Commodity Contract [Member], Designated as Hedging Instrument [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
MidAmerican Energy Company [Member] | Commodity Contract [Member] | Designated as Hedging Instrument [Member]
Accumulated Other Comprehensive (Income) Loss, Net, Derivatives [Roll Forward]
Beginning balance	$11	$32	$43
Changes in fair value recognized in other comprehensive income	-3	-11	27
Net losses reclassified to nonregulated cost of sales	26	-10	-38
Ending balance	34	11	32
Gain (loss) on cash flow hedge ineffectiveness, net	-2	0	0
Cash flow hedge gain (loss) to be reclassified within twelve months	($23)

Risk_Management_and_Hedging_Ac7

Risk Management and Hedging Activities (MEC) Derivative Contract Volumes (Details) (MidAmerican Energy Company [Member], Commodity Contract [Member])	Dec. 31, 2014	Dec. 31, 2013
	MWh	MWh
Electricity purchases (in megawatt hours) [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, Nonmonetary Notional Amount	14,000,000	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 $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
MidAmerican Energy Company [Member] | Commodity Contract [Member]
Derivative [Line Items]
Derivative, net liability position, aggregate fair value	$52	$35
Collateral already posted, aggregate fair value	0	0
Additional collateral, aggregate fair value	$36	$24

Fair_Value_Measurements_MEC_De

Fair Value Measurements (MEC) (Details) (MidAmerican Energy Company [Member], USD $)	Dec. 31, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	($26)	[1]	($23)	[1]
Assets, Fair Value Disclosure	467		513
Cash collateral, net receivable (payable), offset against derivative positions	47		0
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	381		450
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	62		57
Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	50		29
Money market mutual funds [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1	[2]	95	[2]
Money market mutual funds [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1	[2]	95	[2]
Money market mutual funds [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	[2]	0	[2]
Money market mutual funds [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	[2]	0	[2]
United States government obligations [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	136		134
United States government obligations [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	136		134
United States government obligations [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0
United States government obligations [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0
International government obligations [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1		1
International government obligations [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0
International government obligations [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1		1
International government obligations [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0
Corporate obligations [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	39		36
Corporate obligations [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0
Corporate obligations [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	39		36
Corporate obligations [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0
Municipal obligations [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2		2
Municipal obligations [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0
Municipal obligations [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2		2
Municipal obligations [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0
Agency, asset and mortgage-backed obligations [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2		2
Agency, asset and mortgage-backed obligations [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0
Agency, asset and mortgage-backed obligations [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2		2
Agency, asset and mortgage-backed obligations [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0
Auction rate securities [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	26		23
Auction rate securities [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0
Auction rate securities [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0
Auction rate securities [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	26		23
United States companies [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	238		214
United States companies [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	238		214
United States companies [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0
United States companies [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0
International companies [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	5		4
International companies [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	5		4
International companies [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0
International companies [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0
Commodity Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash collateral, net receivable (payable), offset against derivative positions	47		0
Commodity Contract [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	17		2
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	-26	[1]	-23	[1]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	-44		-29
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	73	[1]	23	[1]
Commodity Contract [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	1		3
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	-18		-1
Commodity Contract [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	18		16
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	-87		-42
Commodity Contract [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	24		6
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	($12)		($9)
[1]	Represents netting under master netting arrangements and a net cash collateral receivable of $47 million and $- million as of DecemberB 31, 2014 and 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 $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Commodity Derivatives [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	($3)		$0		$22
Changes included in earnings	12	[1]	3	[1]	5	[1]
Changes in fair value recognized in OCI	0		-2		0
Changes in fair value recognized in net regulatory assets	6		0		-3
Purchases	1		0		0
Settlements	-4		-4		-24
Ending balance	12		-3		0
Net unrealized gains (losses) included earnings	16		-5		0
Debt Securities [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	23		21		16
Changes included in earnings	0	[1]	0	[1]	0	[1]
Changes in fair value recognized in OCI	3		2		5
Changes in fair value recognized in net regulatory assets	0		0		0
Purchases	0		0		0
Settlements	0		0		0
Ending balance	26		23		21
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets (Liabilities), Net, Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash collateral, net receivable (payable), offset against derivative positions	$47		$0
[1]	Changes included in earnings are reported as nonregulated operating revenue on the Statements of Operations. Net unrealized (losses) gains included in earnings for the years ended DecemberB 31, 2014, 2013 and 2012, related to commodity derivatives held at DecemberB 31, 2014 , 2013 and 2012, totaled $16B million, $(5) million and $-B million, respectively.

Fair_Value_Measurements_MEC_De1

Fair Value Measurements (MEC) Debt (Details) (MidAmerican Energy Company [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$4,056	$3,552
Long-term debt, fair value		3,849
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$4,581

Commitments_and_Contingencies_3

Commitments and Contingencies (MEC) (Details) (MidAmerican Energy Company [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	number_of_projects
Contractual Obligation [Line Items]
Contractual Obligation, Due in Next Twelve Months	$1,182
Contractual Obligation, Due in Second Year	322
Contractual Obligation, Due in Third Year	245
Contractual Obligation, Due in Fourth Year	145
Contractual Obligation, Due in Fifth Year	84
Contractual Obligation, Due after Fifth Year	818
Contractual Obligation	2,796
Number of Multi-Value Projects	4
Rent expense	38	34	32
Coal and natural gas for generation [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	190
Purchase Obligation, Due in Second Year	118
Purchase Obligation, Due in Third Year	92
Purchase Obligation, Due in Fourth Year	41
Purchase Obligation, Due in Fifth Year	0
Purchase Obligation, Due after Fifth Year	0
Purchase Obligation	441
Electric capacity and transmission [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	30
Purchase Obligation, Due in Second Year	31
Purchase Obligation, Due in Third Year	30
Purchase Obligation, Due in Fourth Year	11
Purchase Obligation, Due in Fifth Year	11
Purchase Obligation, Due after Fifth Year	66
Purchase Obligation	179
Natural gas contracts for gas operations [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	148
Purchase Obligation, Due in Second Year	69
Purchase Obligation, Due in Third Year	58
Purchase Obligation, Due in Fourth Year	22
Purchase Obligation, Due in Fifth Year	3
Purchase Obligation, Due after Fifth Year	6
Purchase Obligation	306
Construction commitments [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	767
Purchase Obligation, Due in Second Year	56
Purchase Obligation, Due in Third Year	6
Purchase Obligation, Due in Fourth Year	0
Purchase Obligation, Due in Fifth Year	0
Purchase Obligation, Due after Fifth Year	0
Purchase Obligation	829
Operating leases, easements and maintenance and services contracts [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	47
Purchase Obligation, Due in Second Year	48
Purchase Obligation, Due in Third Year	59
Purchase Obligation, Due in Fourth Year	71
Purchase Obligation, Due in Fifth Year	70
Purchase Obligation, Due after Fifth Year	746
Purchase Obligation	$1,041

NonOperating_Other_Net_MEC_Det

Non-Operating Other, Net (MEC) (Details) (MidAmerican Energy Company [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Components of Other Income (Expense), Nonoperating [Line Items]
Non-Operating Other, Net	$9	$15	$9
Corporate-owned life insurance income [Member]
Components of Other Income (Expense), Nonoperating [Line Items]
Non-Operating Other, Net	8	15	9
Gains on sales of assets and other investments [Member]
Components of Other Income (Expense), Nonoperating [Line Items]
Non-Operating Other, Net	0	1	2
Other, net [Member]
Components of Other Income (Expense), Nonoperating [Line Items]
Non-Operating Other, Net	$1	($1)	($2)

Supplemental_Cash_Flows_Inform4

Supplemental Cash Flows Information (MEC) (Details) (MidAmerican Energy Company [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
MidAmerican Energy Company [Member]
Interest paid, net of amounts capitalized	$144		$109		$123
Income taxes received, net	149		36		692
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Accounts payable related to utility plant additions	128		117		122
Deferred payments on equipment purchased for wind-powered generation	$0	[1]	$0	[1]	$406	[1]
[1]	In conjunction with the construction of wind-powered generating facilities, MidAmerican Energy accrued in gross utility plant in service amounts it was not contractually obligated to pay until a stated future date. Refer to Note 8 for additional information.

Related_Party_Transactions_MEC1

Related Party Transactions (MEC) (Details) (MidAmerican Energy Company [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Affiliated Entity [Member]
Related Party Transactions [Line Items]
Expense reimbursement for related party transactions	$58	$38	$51
Receivable from affiliate, current	12	8
Payable to affiliate, current	12	14
Due from affiliates, noncurrent, employee benefit plans	13	5
Due to affiliates, noncurrent, employee benefit plans	30	31
BHE [Member]
Related Party Transactions [Line Items]
Expenses from transactions with related parties	8	10	7
Current federal and state income taxes receivable from (payable to) BHE	299	50
Related party, net cash received for income taxes	149	36	692
Northern Natural Gas and BNSF Railway Company [Member]
Related Party Transactions [Line Items]
Purchases from related party	144	155
Northern Natural Gas [Member]
Related Party Transactions [Line Items]
Purchases from related party			$59

Segment_Information_MEC_Detail

Segment Information (MEC) (Details) (MidAmerican Energy Company [Member], USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
									TheNumberOfReportableSegments
Segment Reporting Information [Line Items]
Number of Reportable Segments									3
Regulated electric revenue									$1,817	$1,762	$1,694
Regulated gas revenue									996	824	659
Nonregulated energy revenue									927	817	889
Total operating revenue	884	862	769	1,225	900	826	757	920	3,740	3,403	3,242
Total depreciation and amortization									351	403	392
Total operating income	58	160	51	153	77	130	43	106	422	356	370
Total fixed charges									158	144	138
Income tax (benefit) expense									-104	-103	-99
Earnings on common stock	58	170	32	157	78	145	23	103	417	349	354
Total utility construction expenditures									1,526	1,026	645
Total assets	13,257				11,869				13,257	11,869	11,232
Regulated electric [Member]
Segment Reporting Information [Line Items]
Regulated electric revenue									1,817	1,762	1,694
Total depreciation and amortization									312	366	356
Total operating income									319	255	270
Total fixed charges									141	129	123
Income tax (benefit) expense									-138	-136	-129
Earnings on common stock									361	292	297
Total utility construction expenditures									1,429	945	588
Total assets	11,859				10,532				11,859	10,532	9,898
Regulated gas [Member]
Segment Reporting Information [Line Items]
Regulated gas revenue									996	824	659
Total depreciation and amortization									39	37	36
Total operating income									75	74	47
Total fixed charges									17	15	15
Income tax (benefit) expense									22	23	7
Earnings on common stock									40	41	28
Total utility construction expenditures									97	81	57
Total assets	1,231				1,206				1,231	1,206	1,202
Nonregulated Energy [Member]
Segment Reporting Information [Line Items]
Nonregulated energy revenue									927	817	889
Total operating income									28	27	53
Income tax (benefit) expense									12	10	23
Earnings on common stock									16	16	29
Total assets	$167				$131				$167	$131	$132

Unaudited_Quarterly_Operating_4

Unaudited Quarterly Operating Results (MEC) (Details) (MidAmerican Energy Company [Member], USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
MidAmerican Energy Company [Member]
Unaudited Quarterly Operating Results [Line Items]
Operating revenue	$884	$862	$769	$1,225	$900	$826	$757	$920	$3,740	$3,403	$3,242
Operating income	58	160	51	153	77	130	43	106	422	356	370
Net income	58	170	32	157	78	145	24	103	417	350	355
Earnings on common stock	$58	$170	$32	$157	$78	$145	$23	$103	$417	$349	$354

Recovered_Sheet2

Summary of Significant Accounting Policies (LLC) (Details) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
MidAmerican Funding, LLC and Subsidiaries [Domain]
Notes to Financial Statements [Line Items]
Goodwill Impairment	$0	$0	$0

Investments_and_Nonregulated_P5

Investments and Nonregulated Property, Net (LLC) (Details) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
MidAmerican Funding, LLC and Subsidiaries [Domain]
Investments and Nonregulated Property, Net [Line Items]
Nuclear decommissioning trust	$424	$394
Rabbi trusts	177	177
Auction rate securities	26	23
Nonregulated property, net of accumulated depreciation of $11 and $11, respectively	21	21
Other	3	10
Total	651	625
Nonregulated property accumulated depreciation	$11	$11

LongTerm_Debt_LLC_Details

Long-Term Debt (LLC) (Details) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	Dec. 31, 2014
Debt Instrument [Line Items]
Restricted net assets	$2,900,000,000
MidAmerican Funding LLC [Member] | Senior Notes, 6.927%, due 2029 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$325,000,000

Recovered_Sheet3

Short-Term Debt and Revolving Credit Facilities (LLC) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Commercial Paper [Member]
Line of Credit Facility [Line Items]
Short-term debt, weighted average interest rate	0.35%
MidAmerican Funding, LLC and Subsidiaries [Domain] | MHC, Inc. [Member] | Unsecured 364-day credit facility, $4 million, expiring June 2015 [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity	$4
Credit facility, expiration date	30-Jun-15
Credit facility, amount outstanding	$0	$0

Income_Taxes_LLC_Components_of

Income Taxes (LLC) Components of Income Tax Expense (Benefit) (Details) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
MidAmerican Funding, LLC and Subsidiaries [Domain]
Components of Income Tax Expense (Benefit) [Line Items]
Current federal	($404)	($200)	($260)
Current state	-4	-12	-23
Total current income tax expense (benefit)	-408	-212	-283
Deferred federal	297	100	198
Deferred state	2	3	-21
Total deferred income tax expense (benefit)	299	103	177
Investment tax credits	-1	-1	-2
Total income tax (benefit) expense	($110)	($110)	($108)

Income_Taxes_LLC_Reconciliatio

Income Taxes (LLC) Reconciliation of Effective Income Tax Rate (Details) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	35.00%	35.00%	35.00%
Income tax credits	-61.00%	-75.00%	-60.00%
State income tax, net of federal income tax benefit	-1.00%	-3.00%	-12.00%
Income tax method changes	0.00%	0.00%	-6.00%
Effects of ratemaking	-9.00%	-3.00%	-1.00%
Other, net	-1.00%	-2.00%	-2.00%
Effective income tax rate	-37.00%	-48.00%	-46.00%
Production Tax Credit Carryforwards [Abstract]
Years eligible for renewable energy production tax credit	10 years
Repairs deduction [Member]
Income tax method change [Abstract]
Income tax benefits from tax method change		16

Income_Taxes_LLC_Components_of1

Income Taxes (LLC) Components of Net Deferred Income Tax Liability (Details) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred income tax assets: [Abstract]
Regulatory liabilities	332	$351
Employee benefits	68	61
Derivative contracts	30	9
Asset retirement obligations	185	172
Other	69	72
Total deferred income tax assets	684	665
Deferred income tax Liabilities: [Abstract]
Depreciable property	-2,950	-2,604
Regulatory assets	-366	-304
Other	-25	-43
Total deferred income tax liabilities	-3,341	-2,951
Net deferred income tax liabilities	-2,657	-2,286
Reflected as: [Abstract]
Current assets - other	0	4
Deferred income taxes	-2,657	-2,290
Minimum [Member]
Summary of Tax Credit Carryforwards [Abstract]
Domestic carryforwards expiration date	2015
Maximum [Member]
Summary of Tax Credit Carryforwards [Abstract]
Domestic carryforwards expiration date	2033
State and Local [Member]
Summary of Tax Credit Carryforwards [Abstract]
State carryforwards	20
Net operating loss carryforwards	429

Income_Taxes_LLC_Net_Unrecogni

Income Taxes (LLC) Net Unrecognized Tax Benefits (Details) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
MidAmerican Funding, LLC and Subsidiaries [Domain]
Net Unrecognized Tax Benefits [Line Items]
Unrecognized tax benefits that would impact the effective tax rate	$26	$29
Reconciliation of Net Unrecognized Tax Benefits [Roll Forward]
Beginning balance	29	37
Additions based on tax positions related to current year	6	11
Additions for tax positions of prior years	38	3
Reductions based on tax positions related to the current year	-4	-10
Reductions for tax positions of prior years	-40	-9
Statute of limitations	-3	-2
Settlements	0	-1
Ending balance	$26	$29

Employee_Benefit_Plans_LLC_Net

Employee Benefit Plans (LLC) Net Periodic Benefit Cost (Details) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost	$4	$6	$5
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost	($2)	($2)	($2)

Fair_Value_Measurements_LLC_De

Fair Value Measurements (LLC) Debt (Details) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$4,381	$3,877
Long-term debt, fair value		4,245
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$5,012

NonOperating_Other_Net_LLC_Det

Non-Operating Other, Net (LLC) (Details) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Components of Other Income (Expense), Nonoperating [Line Items]
Non-Operating Other, Net	$17	$21	$13
Corporate-owned life insurance income [Member]
Components of Other Income (Expense), Nonoperating [Line Items]
Non-Operating Other, Net	8	15	9
Gains on sales of assets and other investments [Member]
Components of Other Income (Expense), Nonoperating [Line Items]
Non-Operating Other, Net	0	1	2
Assets Leased to Others [Member]
Components of Other Income (Expense), Nonoperating [Line Items]
Non-Operating Other, Net	5	2	2
Other, net [Member]
Components of Other Income (Expense), Nonoperating [Line Items]
Non-Operating Other, Net	$4	$3	$0

Supplemental_Cash_Flows_Inform5

Supplemental Cash Flows Information (LLC) (Details) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
MidAmerican Funding, LLC and Subsidiaries [Domain]
Interest paid, net of amounts capitalized	$167		$132		$147
Income taxes received, net	153		42		698
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Accounts payable related to utility plant additions	128		117		122
Deferred payments on equipment purchased for wind-powered generation at MidAmerican Energy	$0	[1]	$0	[1]	$406	[1]
[1]	In conjunction with the construction of wind-powered generating facilities, MidAmerican Energy accrued in gross utility plant in service amounts it was not contractually obligated to pay until a stated future date. Refer to Note 8 for additional information.

Related_Party_Transactions_LLC1

Related Party Transactions (LLC) (Details) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Party Transactions [Line Items]
Note payable to affiliate	$136	$135
Debt indenture maximum debt to capitalization ratio	0.67
Debt indenture minimum interest coverage ratio	2.2
Affiliated Entity [Member]
Related Party Transactions [Line Items]
Expense reimbursement for related party transactions	37	28	42
Receivable from affiliate, current	7	7
Payable to affiliate, current	12	14
Due from affiliates, noncurrent, employee benefit plans	13	5
Due to affiliates, noncurrent, employee benefit plans	30	31
BHE [Member]
Related Party Transactions [Line Items]
Expenses from transactions with related parties	8	10	7
Current federal and state income taxes receivable from (payable to) BHE	296	46
Related party, net cash received for income taxes	154	42	698
BHE [Member] | MHC, Inc. [Member] | Line of Credit [Member] | Revolving Credit Arrangement, $300 million [Member]
Related Party Transactions [Line Items]
Line of Credit Arrangement Offered to Affiliate, Maximum Amount Available	300
Note payable to affiliate	136	135
Debt, Weighted Average Interest Rate	0.41%	0.42%
BHE [Member] | MHC, Inc. [Member] | Line of Credit [Member] | Revolving Credit Arrangement, $100 million [Member]
Related Party Transactions [Line Items]
Credit facility, maximum borrowing capacity	100
Notes Receivable, Related Parties, Current	0	0
Northern Natural Gas and BNSF Railway Company [Member]
Related Party Transactions [Line Items]
Purchases from related party	144	155
Northern Natural Gas [Member]
Related Party Transactions [Line Items]
Purchases from related party			$59

Segment_Information_LLC_Detail

Segment Information (LLC) (Details) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
									TheNumberOfReportableSegments
Segment Reporting Information [Line Items]
Number of Reportable Segments									3
Regulated electric revenue									$1,817	$1,762	$1,694
Regulated gas revenue									996	824	659
Nonregulated									949	827	894
Total operating revenue	893	864	775	1,230	905	828	759	921	3,762	3,413	3,247
Total depreciation and amortization									351	403	392
Total operating income	58	161	51	153	78	130	43	106	423	357	369
Total fixed charges									181	167	162
Total income tax (benefit) expense									-110	-110	-108
Total net income attributable to MidAmerican Funding									409	340	342
Total utility construction expenditures									1,526	1,026	645
Total assets	14,544				13,167				14,544	13,167	12,530
Regulated electric [Member]
Segment Reporting Information [Line Items]
Regulated electric revenue									1,817	1,762	1,694
Total depreciation and amortization									312	366	356
Total operating income									319	255	270
Total fixed charges									141	129	123
Total income tax (benefit) expense									-138	-136	-129
Total net income attributable to MidAmerican Funding									361	292	297
Total utility construction expenditures									1,429	945	588
Total assets	13,050				11,723				13,050	11,723	11,089
Regulated gas [Member]
Segment Reporting Information [Line Items]
Regulated gas revenue									996	824	659
Total depreciation and amortization									39	37	36
Total operating income									75	74	47
Total fixed charges									17	15	15
Total income tax (benefit) expense									22	23	7
Total net income attributable to MidAmerican Funding									40	41	28
Total utility construction expenditures									97	81	57
Total assets	1,310				1,285				1,310	1,285	1,280
Nonregulated Energy [Member]
Segment Reporting Information [Line Items]
Nonregulated									927	817	889
Total operating income									28	27	53
Total income tax (benefit) expense									12	10	23
Total net income attributable to MidAmerican Funding									16	16	29
Total assets	167				131				167	131	132
Other [Member]
Segment Reporting Information [Line Items]
Nonregulated									22	10	5
Total operating income									1	1	-1
Total fixed charges									23	23	24
Total income tax (benefit) expense									-6	-7	-9
Total net income attributable to MidAmerican Funding									-8	-9	-12
Total assets	$17				$28				$17	$28	$29

Segment_Information_LLC_Goodwi

Segment Information (LLC) Goodwill (Details) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Goodwill [Line Items]
Goodwill	$1,270	$1,270
Regulated electric [Member]
Goodwill [Line Items]
Goodwill	1,191	1,191
Regulated gas [Member]
Goodwill [Line Items]
Goodwill	$79	$79

Unaudited_Quarterly_Operating_5

Unaudited Quarterly Operating Results (LLC) (Details) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
MidAmerican Funding, LLC and Subsidiaries [Domain]
Unaudited Quarterly Operating Results [Line Items]
Operating revenue	$893	$864	$775	$1,230	$905	$828	$759	$921	$3,762	$3,413	$3,247
Operating income	58	161	51	153	78	130	43	106	423	357	369
Net income	56	168	30	155	76	143	22	100	409	341	343
Net income attributable to MidAmerican Funding	$56	$168	$30	$155	$76	$143	$21	$100	$409	$340	$342

Schedule_I_MidAmerican_Funding

Schedule I MidAmerican Funding, LLC Condensed Financial Statements (MidAmerican Funding LLC [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding LLC [Member]
Condensed Financial Statements, Captions [Line Items]
Condensed Financial Information of Parent Company Only Disclosure [Text Block]	SCHEDULE I
	Page 1 of 4
	MIDAMERICAN FUNDING, LLC
	PARENT COMPANY ONLY
	CONDENSED BALANCE SHEETS
	(Amounts in millions)
		As of December 31,
		2014			2013
	ASSETS
	Current assets:
	Receivables from affiliates	$	2		$	3
	Investments in and advances to subsidiaries	5,679			5,269
	Total assets	$	5,681		$	5,272
	LIABILITIES AND MEMBER'S EQUITY
	Current liabilities:
	Interest accrued and other current liabilities	$	8		$	8
	Payable to affiliate	274			261
	Long-term debt	325			325
	Other	1			1
	Total liabilities	608			595
	Member's equity:
	Paid-in capital	1,679			1,679
	Retained earnings	3,417			3,009
	Accumulated other comprehensive loss, net	(23		)	(11		)
	Total member's equity	5,073			4,677
	Total liabilities and member's equity	$	5,681		$	5,272
	The accompanying notes are an integral part of this financial statement schedule.
	SCHEDULE I
	Page 2 of 4
	MIDAMERICAN FUNDING, LLC
	PARENT COMPANY ONLY
	CONDENSED STATEMENTS OF OPERATIONS
	(Amounts in millions)
		Years Ended December 31,
		2014			2013			2012
	Interest on long-term debt	$	22		$	22		$	22
	Loss before income taxes	(22		)	(22		)	(22		)
	Income tax benefit	(9		)	(9		)	(9		)
	Equity in undistributed earnings of subsidiaries	422			353			355
	Net income	$	409		$	340		$	342
	The accompanying notes are an integral part of this financial statement schedule.
	MIDAMERICAN FUNDING, LLC
	PARENT COMPANY ONLY
	CONDENSED STATEMENTS OF COMPREHENSIVE INCOME
	(Amounts in millions)
		Years Ended December 31,
		2014			2013			2012
	Net income	$	409		$	340		$	342
	Total other comprehensive (loss) income, net of tax	(12		)	13			10
	Comprehensive income	$	397		$	353		$	352
	The accompanying notes are an integral part of this financial statement schedule.
	SCHEDULE I
	Page 3 of 4
	MIDAMERICAN FUNDING, LLC
	PARENT COMPANY ONLY
	CONDENSED STATEMENTS OF CASH FLOWS
	(In millions)
		Years Ended December 31,
		2014			2013			2012
	Net cash flows from operating activities	$	(13	)	$	(13	)	$	(13	)
	Net cash flows from investing activities	—			—			—
	Net cash flows from financing activities:
	Net change in amounts payable to subsidiary	13			13			13
	Net cash flows from financing activities	13			13			13
Net change in cash and cash equivalents	—			—			—
Cash and cash equivalents at beginning of year	—			—			—
Cash and cash equivalents at end of year	$	—		$	—		$	—
The accompanying notes are an integral part of this financial statement schedule.
SCHEDULE I
Page 4 of 4
MIDAMERICAN FUNDING, LLC
PARENT COMPANY ONLY
NOTES TO CONDENSED FINANCIAL STATEMENTS
Incorporated by reference are MidAmerican Funding, LLC and Subsidiaries Consolidated Statements of Changes in Equity for the three years ended December 31, 2014, and the related Consolidated Statements of Capitalization as of December 31, 2014 and 2013, in Part II, Item 8.
Basis of Presentation - The condensed financial information of MidAmerican Funding, LLC's ("MidAmerican Funding's") investments in subsidiaries is presented under the equity method of accounting. Under this method, the assets and liabilities of subsidiaries are not consolidated. The investments in and advances to subsidiaries are recorded on the Condensed Balance Sheets. The income from operations of the subsidiaries is reported on a net basis as equity in undistributed earnings of subsidiary companies on the Condensed Statements of Operations.
Payable to Affiliate - MHC, Inc. ("MHC") settles all obligations of MidAmerican Funding including primarily interest costs on, and repayments of, MidAmerican Funding's long-term debt. Net amounts paid by MHC on behalf of MidAmerican Funding totaled $13 million for each of the years 2014, 2013 and 2012.
See the notes to the consolidated MidAmerican Funding financial statements in Part II, Item 8 for other disclosures.

Schedule_I_MidAmerican_Funding1

Schedule I MidAmerican Funding, LLC Condensed Financial Statements Condensed Balance Sheets (Details) (MidAmerican Funding LLC [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
MidAmerican Funding LLC [Member]
Current assets:
Receivables from affiliates	$2	$3
Investments in and advances to subsidiaries	5,679	5,269
Total assets	5,681	5,272
Current liabilities:
Interest accrued and other current liabilities	8	8
Payable to affiliate	274	261
Long-term debt	325	325
Other	1	1
Total liabilities	608	595
Member's equity:
Paid-in capital	1,679	1,679
Retained earnings	3,417	3,009
Accumulated other comprehensive loss, net	-23	-11
MidAmerican Funding member's equity	5,073	4,677
Total capitalization and liabilities	$5,681	$5,272

Schedule_I_MidAmerican_Funding2

Schedule I MidAmerican Funding, LLC Condensed Financial Statements Condensed Statements of Operations (Details) (MidAmerican Funding LLC [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
MidAmerican Funding LLC [Member]
Condensed Financial Statements, Captions [Line Items]
Interest on long-term debt	$22	$22	$22
Income (loss) before income tax benefit	-22	-22	-22
Income tax (benefit) expense	-9	-9	-9
Equity in undistributed earnings of subsidiaries	422	353	355
Net income attributable to MidAmerican Funding	$409	$340	$342

Schedule_I_MidAmerican_Funding3

Schedule I MidAmerican Funding, LLC Condensed Financial Statements Condensed Statements of Comprehensive Income (MidAmerican Funding LLC [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
MidAmerican Funding LLC [Member]
Condensed Financial Statements, Captions [Line Items]
Net income	$409	$340	$342
Total other comprehensive (loss) income, net of tax	-12	13	10
Comprehensive income attributable to MidAmerican Funding	$397	$353	$352

Schedule_I_MidAmerican_Funding4

Schedule I MidAmerican Funding, LLC Condensed Financial Statements Condensed Statements of Cash Flows (Details) (MidAmerican Funding LLC [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
MidAmerican Funding LLC [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash flows from operating activities	($13)	($13)	($13)
Net cash flows from investing activities:
Net cash flows from investing activities	0	0	0
Net cash flows from financing activities:
Net change in amounts payable to subsidiary	13	13	13
Net cash flows from financing activities	13	13	13
Net change in cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of year	0	0	0
Cash and cash equivalents at end of year	$0	$0	$0

Schedule_I_MidAmerican_Funding5

Schedule I MidAmerican Funding, LLC Condensed Financial Statements Condensed Financial Statements - Notes (Details) (MidAmerican Funding LLC [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Net amounts paid by affiliate	$13	$13	$13
MHC, Inc. [Member]
Condensed Financial Statements, Captions [Line Items]
Net amounts paid by affiliate	$13

Schedule_II_Valuation_and_Qual

Schedule II Valuation and Qualifying Accounts (MEC) (MidAmerican Energy Company [Member])	12 Months Ended
	Dec. 31, 2014
MidAmerican Energy Company [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]	SCHEDULE II
	MIDAMERICAN ENERGY COMPANY
	VALUATION AND QUALIFYING ACCOUNTS
	FOR THE THREE YEARS ENDED DECEMBER 31, 2014
	(Amounts in millions)
			Column B		Column C					Column E
			Balance at		Additions					Balance
	Column A		Beginning		Charged		Column D			at End
	Description		of Year		to Income		Deductions			of Year
	Reserves Deducted From Assets To Which They Apply:
	Reserve for uncollectible accounts receivable:
	Year ended 2014		$	10	$	7	$	(10	)	$	7
	Year ended 2013		$	10	$	7	$	(7	)	$	10
	Year ended 2012		$	8	$	8	$	(6	)	$	10
	Reserves Not Deducted From Assets(1):
	Year ended 2014		$	9	$	12	$	(10	)	$	11
	Year ended 2013		$	9	$	6	$	(6	)	$	9
	Year ended 2012		$	8	$	6	$	(5	)	$	9
	-1	Reserves not deducted from assets include estimated liabilities for losses retained by MidAmerican Energy for workers compensation, public liability and property damage claims.

Schedule_II_Valuation_and_Qual1

Schedule II Valuation and Qualifying Accounts (MEC) (Details) (MidAmerican Energy Company [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Reserve for uncollectible accounts receivable [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$10		$10		$8
Charged to Income	7		7		8
Deductions	-10		-7		-6
Balance at End of Year	7		10		10
Reserves Not Deducted From Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	9	[1]	9	[1]	8	[1]
Charged to Income	12	[1]	6	[1]	6	[1]
Deductions	-10	[1]	-6	[1]	-5	[1]
Balance at End of Year	$11	[1]	$9	[1]	$9	[1]
[1]	(1)Reserves not deducted from assets include estimated liabilities for losses retained by MidAmerican Energy for workers compensation, public liability and property damage claims.

Schedule_II_Valuation_and_Qual2

Schedule II Valuation and Qualifying Accounts (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain])	12 Months Ended
	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Valuation and Qualifying Accounts Disclosure [Line Items]
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]	SCHEDULE II
	MIDAMERICAN FUNDING, LLC AND SUBSIDIARIES
	MHC INC. AND SUBSIDIARIES
	CONSOLIDATED VALUATION AND QUALIFYING ACCOUNTS
	FOR THE THREE YEARS ENDED DECEMBER 31, 2014
	(Amounts in millions)
			Column B		Column C					Column E
			Balance at		Additions					Balance
	Column A		Beginning		Charged		Column D			at End
	Description		of Year		to Income		Deductions			of Year
	Reserves Deducted From Assets To Which They Apply:
	Reserve for uncollectible accounts receivable:
	Year ended 2014		$	10	$	7	$	(10	)	$	7
	Year ended 2013		$	10	$	7	$	(7	)	$	10
	Year ended 2012		$	8	$	8	$	(6	)	$	10
	Reserves Not Deducted From Assets (1):
	Year ended 2014		$	9	$	12	$	(10	)	$	11
	Year ended 2013		$	9	$	6	$	(6	)	$	9
	Year ended 2012		$	8	$	6	$	(5	)	$	9
	-1	Reserves not deducted from assets include primarily estimated liabilities for losses retained by MidAmerican Funding and MHC for workers compensation, public liability and property damage claims.

Schedule_II_Valuation_and_Qual3

Schedule II Valuation and Qualifying Accounts (LLC) (Details) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Reserve for uncollectible accounts receivable [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$10		$10		$8
Charged to Income	7		7		8
Deductions	-10		-7		-6
Balance at End of Year	7		10		10
Reserves Not Deducted From Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	9	[1]	9	[1]	8	[1]
Charged to Income	12	[1]	6	[1]	6	[1]
Deductions	-10	[1]	-6	[1]	-5	[1]
Balance at End of Year	$11	[1]	$9	[1]	$9	[1]
[1]	(1)Reserves not deducted from assets include primarily estimated liabilities for losses retained by MidAmerican Funding and MHC for workers compensation, public liability and property damage claims.