The percentage of common equity to total capitalization computed on a basis with its commitment to regulators.

No definition available.

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- Definition

Represents the minimum common equity to total capitalization percentage allowed under acquisition commitment without prior regulatory approval, unless there are circumstances beyond the entity’s control.

+ References

No definition available.

+ Details

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- Definition

In the event there are circumstances beyond the entity’s control, represents the minimum common equity to total capitalization percentage allowed under acquisition commitment without prior regulatory approval.

+ References

No definition available.

+ Details

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- Definition

Represents the amount of eligible property that was subject to lien of mortgage (based on original cost).

+ References

No definition available.

+ Details

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- Definition

Discount rate applied to vendor financing.

+ References

No definition available.

+ Details

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- Definition

The amount of dividends that can be declared or paid without affecting the banking or savings institution's regulatory capital position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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-Name Accounting Standards Codification
-Topic 835
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

+ References

+ Details

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- Definition

Amount of long-term debt classified as other.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Period Type:	instant

- Definition

Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586

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-Publisher FASB
-Name Accounting Standards Codification
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Subsidiary Debt Subsidiary Debt - MEC (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Feb. 28, 2018	Dec. 01, 2017	Dec. 31, 2016	Dec. 01, 2016
Debt Instrument [Line Items]
Par value	$ 35,376
Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value	28,780
Other long-term debt	28,641			$ 27,354
MidAmerican Funding [Member] \| Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value	5,319
Other long-term debt	5,259			4,592
MidAmerican Energy Company [Member] \| MidAmerican Funding [Member] \| Subsidiary Debt [Member]
Debt Instrument [Line Items]
Par value	5,080
Other long-term debt	5,043			4,301
Eligible Property Subject To Lien Of Mortgages	16,000
MidAmerican Energy Company [Member] \| MidAmerican Funding [Member] \| Subsidiary Debt [Member] \| MEC First Mortgage Bonds, 2.40%, Due March 2019 [Member]
Debt Instrument [Line Items]
Par value	500
Other long-term debt	$ 499			$ 499
Debt Instrument, Interest Rate, Stated Percentage	2.40%			2.40%
MidAmerican Energy Company [Member] \| MidAmerican Funding [Member] \| Subsidiary Debt [Member] \| MEC First Mortgage Bonds, 3.70%, Due September 2023 [Member]
Debt Instrument [Line Items]
Par value	$ 250
Other long-term debt	$ 248			$ 248
Debt Instrument, Interest Rate, Stated Percentage	3.70%			3.70%
MidAmerican Energy Company [Member] \| MidAmerican Funding [Member] \| Subsidiary Debt [Member] \| MEC First Mortgage Bonds, 3.50%, Due October 2024 [Member]
Debt Instrument [Line Items]
Par value	$ 500
Other long-term debt	$ 501			$ 501
Debt Instrument, Interest Rate, Stated Percentage	3.50%			3.50%
MidAmerican Energy Company [Member] \| MidAmerican Funding [Member] \| Subsidiary Debt [Member] \| MEC First Mortgage Bonds, 3.10%, Due May 2027 [Member]
Debt Instrument [Line Items]
Par value	$ 375
Other long-term debt	$ 372			$ 0
Debt Instrument, Interest Rate, Stated Percentage	3.10%			3.10%
MidAmerican Energy Company [Member] \| MidAmerican Funding [Member] \| Subsidiary Debt [Member] \| MEC First Mortgage Bonds, 4.80%, Due September 2043 [Member]
Debt Instrument [Line Items]
Par value	$ 350
Other long-term debt	$ 346			$ 345
Debt Instrument, Interest Rate, Stated Percentage	4.80%			4.80%
MidAmerican Energy Company [Member] \| MidAmerican Funding [Member] \| Subsidiary Debt [Member] \| MEC First Mortgage Bonds, 4.40%, Due October 2044 [Member]
Debt Instrument [Line Items]
Par value	$ 400
Other long-term debt	$ 394			$ 394
Debt Instrument, Interest Rate, Stated Percentage	4.40%			4.40%
MidAmerican Energy Company [Member] \| MidAmerican Funding [Member] \| Subsidiary Debt [Member] \| MEC First Mortgage Bonds, 4.25%, Due May 2046 [Member]
Debt Instrument [Line Items]
Par value	$ 450
Other long-term debt	$ 445			$ 445
Debt Instrument, Interest Rate, Stated Percentage	4.25%			4.25%
MidAmerican Energy Company [Member] \| MidAmerican Funding [Member] \| Subsidiary Debt [Member] \| MEC First Mortgage Bonds, 3.95%, Due 2047 [Member]
Debt Instrument [Line Items]
Par value	$ 475
Other long-term debt	$ 470			$ 0
Debt Instrument, Interest Rate, Stated Percentage	3.95%			3.95%
MidAmerican Energy Company [Member] \| MidAmerican Funding [Member] \| Subsidiary Debt [Member] \| MEC Notes, 5.95% Series, due 2017 [Member]
Debt Instrument [Line Items]
Par value	$ 0
Other long-term debt	$ 0			$ 250
Debt Instrument, Interest Rate, Stated Percentage	5.95%			5.95%
MidAmerican Energy Company [Member] \| MidAmerican Funding [Member] \| Subsidiary Debt [Member] \| MEC Notes, 5.3% Series, due 2018 [Member]
Debt Instrument [Line Items]
Par value	$ 350
Other long-term debt	$ 350			$ 350
Debt Instrument, Interest Rate, Stated Percentage	5.30%			5.30%
MidAmerican Energy Company [Member] \| MidAmerican Funding [Member] \| Subsidiary Debt [Member] \| MEC Notes, 6.75% Series, due 2031 [Member]
Debt Instrument [Line Items]
Par value	$ 400
Other long-term debt	$ 396			$ 396
Debt Instrument, Interest Rate, Stated Percentage	6.75%			6.75%
MidAmerican Energy Company [Member] \| MidAmerican Funding [Member] \| Subsidiary Debt [Member] \| MEC Notes, 5.75% Series, due 2035 [Member]
Debt Instrument [Line Items]
Par value	$ 300
Other long-term debt	$ 298			$ 298
Debt Instrument, Interest Rate, Stated Percentage	5.75%			5.75%
MidAmerican Energy Company [Member] \| MidAmerican Funding [Member] \| Subsidiary Debt [Member] \| MEC Notes, 5.8% Series, due 2036 [Member]
Debt Instrument [Line Items]
Par value	$ 350
Other long-term debt	$ 348			$ 347
Debt Instrument, Interest Rate, Stated Percentage	5.80%			5.80%
MidAmerican Energy Company [Member] \| MidAmerican Funding [Member] \| Subsidiary Debt [Member] \| MEC Transmission Upgrade Obligations, 4.45% and 3.42% Due Through 2035 and 2036 [Member]
Debt Instrument [Line Items]
Par value	$ 8
Other long-term debt	$ 6			$ 7
Vendor Financing, Discount Rate Applied				4.45%
MidAmerican Energy Company [Member] \| MidAmerican Funding [Member] \| Subsidiary Debt [Member] \| Capital Lease Obligations, 4.16%, Due Through 2020 [Member]
Debt Instrument [Line Items]
Vendor Financing, Discount Rate Applied	4.16%			4.16%
MidAmerican Energy Company [Member] \| MidAmerican Funding [Member] \| Subsidiary Debt [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Par value	$ 180
MidAmerican Energy Company [Member] \| MidAmerican Funding [Member] \| Maximum [Member] \| Subsidiary Debt [Member] \| MEC Transmission Upgrade Obligations, 4.45% and 3.42% Due Through 2035 and 2036 [Member]
Debt Instrument [Line Items]
Vendor Financing, Discount Rate Applied	4.45%
MidAmerican Energy Company [Member] \| MidAmerican Funding [Member] \| Minimum [Member] \| Subsidiary Debt [Member] \| MEC Transmission Upgrade Obligations, 4.45% and 3.42% Due Through 2035 and 2036 [Member]
Debt Instrument [Line Items]
Vendor Financing, Discount Rate Applied	3.42%
MidAmerican Energy Company [Member] \| Subsequent Event [Member] \| MidAmerican Funding [Member] \| Subsidiary Debt [Member] \| MEC First Mortgage Bonds, 3.65%, Due August 2048 [Member]
Debt Instrument [Line Items]
Par value		$ 700
Debt Instrument, Interest Rate, Stated Percentage		4.00%
MidAmerican Energy Company [Member]
Debt Instrument [Line Items]
Par value	$ 5,080
Other long-term debt	5,042			$ 4,301
Eligible Property Subject To Lien Of Mortgages	$ 16,000
MidAmerican Energy Company [Member] \| Tax-exempt bond obligations, variable rate, due 2016-2046 [Member]
Debt Instrument [Line Items]
Variable interest rate	1.91%
MidAmerican Energy Company [Member] \| MEC First Mortgage Bonds, 2.40%, Due March 2019 [Member]
Debt Instrument [Line Items]
Par value	$ 500
Other long-term debt	$ 499			$ 499
Debt Instrument, Interest Rate, Stated Percentage	2.40%			2.40%
MidAmerican Energy Company [Member] \| MEC First Mortgage Bonds, 3.70%, Due September 2023 [Member]
Debt Instrument [Line Items]
Par value	$ 250
Other long-term debt	$ 248			$ 248
Debt Instrument, Interest Rate, Stated Percentage	3.70%			3.70%
MidAmerican Energy Company [Member] \| MEC First Mortgage Bonds, 3.50%, Due October 2024 [Member]
Debt Instrument [Line Items]
Par value	$ 500
Other long-term debt	$ 501			$ 501
Debt Instrument, Interest Rate, Stated Percentage	3.50%			3.50%
MidAmerican Energy Company [Member] \| MEC First Mortgage Bonds, 3.10%, Due May 2027 [Member]
Debt Instrument [Line Items]
Par value	$ 375
Other long-term debt	372			$ 0
MidAmerican Energy Company [Member] \| MEC First Mortgage Bonds, 4.80%, Due September 2043 [Member]
Debt Instrument [Line Items]
Par value	350
Other long-term debt	$ 346			$ 345
Debt Instrument, Interest Rate, Stated Percentage	4.80%			4.80%
MidAmerican Energy Company [Member] \| MEC First Mortgage Bonds, 4.40%, Due October 2044 [Member]
Debt Instrument [Line Items]
Par value	$ 400
Other long-term debt	$ 394			$ 394
Debt Instrument, Interest Rate, Stated Percentage	4.40%			4.40%
MidAmerican Energy Company [Member] \| MEC First Mortgage Bonds, 4.25%, Due May 2046 [Member]
Debt Instrument [Line Items]
Par value	$ 450
Other long-term debt	$ 445			$ 445
Debt Instrument, Interest Rate, Stated Percentage	4.25%			4.25%
MidAmerican Energy Company [Member] \| MEC First Mortgage Bonds, 3.95%, Due 2047 [Member]
Debt Instrument [Line Items]
Par value	$ 475
Other long-term debt	470			$ 0
MidAmerican Energy Company [Member] \| MEC Notes, 5.95% Series, due 2017 [Member]
Debt Instrument [Line Items]
Par value	0
Other long-term debt	$ 0			$ 250
Debt Instrument, Interest Rate, Stated Percentage	5.95%			5.95%
MidAmerican Energy Company [Member] \| MEC Notes, 5.3% Series, due 2018 [Member]
Debt Instrument [Line Items]
Par value	$ 350
Other long-term debt	$ 350			$ 350
Debt Instrument, Interest Rate, Stated Percentage	5.30%			5.30%
MidAmerican Energy Company [Member] \| MEC Notes, 6.75% Series, due 2031 [Member]
Debt Instrument [Line Items]
Par value	$ 400
Other long-term debt	$ 396			$ 396
Debt Instrument, Interest Rate, Stated Percentage	6.75%			6.75%
MidAmerican Energy Company [Member] \| MEC Notes, 5.75% Series, due 2035 [Member]
Debt Instrument [Line Items]
Par value	$ 300
Other long-term debt	$ 298			$ 298
Debt Instrument, Interest Rate, Stated Percentage	5.75%			5.75%
MidAmerican Energy Company [Member] \| MEC Notes, 5.8% Series, due 2036 [Member]
Debt Instrument [Line Items]
Par value	$ 350
Other long-term debt	$ 347			$ 347
Debt Instrument, Interest Rate, Stated Percentage	5.80%			5.80%
MidAmerican Energy Company [Member] \| MEC Transmission Upgrade Obligations, 4.45% and 3.42% Due Through 2035 and 2036 [Member]
Debt Instrument [Line Items]
Par value	$ 8
Other long-term debt	6			$ 7
MidAmerican Energy Company [Member] \| MEC Transmission Upgrade Obligation, 4.449%, Due Through 2035 [Member]
Debt Instrument [Line Items]
Vendor Financing, Discount Rate Applied				4.45%
MidAmerican Energy Company [Member] \| Variable Rate Tax Exempt Obligation Series due 2023, issued 1993 [Member]
Debt Instrument [Line Items]
Par value	7
Other long-term debt	7			$ 7
MidAmerican Energy Company [Member] \| Variable Rate Tax Exempt Obligation Series Due 2023, issued in 2008 [Member]
Debt Instrument [Line Items]
Par value	57
Other long-term debt	57			57
MidAmerican Energy Company [Member] \| Variable-rate tax-exempt obligation series due 2024 [Member]
Debt Instrument [Line Items]
Par value	35
Other long-term debt	35			35
MidAmerican Energy Company [Member] \| Variable-rate tax-exempt obligation series, due 2025 [Member]
Debt Instrument [Line Items]
Par value	13
Other long-term debt	13			13
MidAmerican Energy Company [Member] \| Variable-rate tax-exempt obligation series, due 2036 [Member]
Debt Instrument [Line Items]
Par value	33
Other long-term debt	33			33
MidAmerican Energy Company [Member] \| Variable-rate tax-exempt obligation series, due 2038 [Member]
Debt Instrument [Line Items]
Par value	45
Other long-term debt	45			45
MidAmerican Energy Company [Member] \| Variable-rate tax-exempt obligation series, due 2046 [Member]
Debt Instrument [Line Items]
Par value	30				$ 30
Other long-term debt	29			29
MidAmerican Energy Company [Member] \| Variable Rate Tax Exempt Obligation Series Due 2047 [Member]
Debt Instrument [Line Items]
Par value	150		$ 150
Other long-term debt	149			0
MidAmerican Energy Company [Member] \| Capital Lease Obligations, 4.16%, Due Through 2020 [Member]
Debt Instrument [Line Items]
Par value	2
Other long-term debt	$ 2			$ 2
Debt Instrument, Interest Rate, Stated Percentage	4.16%
MidAmerican Energy Company [Member] \| Tax-exempt bond obligations, variable rate, due 2016-2038 [Member]
Debt Instrument [Line Items]
Variable interest rate				0.76%
MidAmerican Energy Company [Member] \| Committed Common Equity Percentage To Regulators [Member]
Debt Instrument [Line Items]
Common equity to total capitalization percentage	42.00%
MidAmerican Energy Company [Member] \| 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%
MidAmerican Energy Company [Member] \| Dividend Restriction For Common Equity Commitment [Member]
Debt Instrument [Line Items]
Amount Available for Dividend Distribution without Affecting Capital Adequacy Requirements	$ 2,100
MidAmerican Energy Company [Member] \| Common Equity Level To Total Capitalization [Member]
Debt Instrument [Line Items]
Common Equity Level To Total Capitalization	53.00%
MidAmerican Energy Company [Member] \| Maximum [Member] \| MEC Transmission Upgrade Obligations, 4.45% and 3.42% Due Through 2035 and 2036 [Member]
Debt Instrument [Line Items]
Vendor Financing, Discount Rate Applied	4.45%
MidAmerican Energy Company [Member] \| Minimum [Member] \| MEC Transmission Upgrade Obligations, 4.45% and 3.42% Due Through 2035 and 2036 [Member]
Debt Instrument [Line Items]
Vendor Financing, Discount Rate Applied	3.42%
MidAmerican Energy Company [Member] \| Subsequent Event [Member] \| MidAmerican Energy Company [Member] \| MEC First Mortgage Bonds, 3.65%, Due August 2048 [Member]
Debt Instrument [Line Items]
Par value		$ 700
Debt Instrument, Interest Rate, Stated Percentage		3.65%
MidAmerican Energy Company [Member] \| Variable Rate Tax Exempt Obligation Series Due 2047 [Member]
Debt Instrument [Line Items]
Restricted Cash and Cash Equivalents, Current	$ 108