Segment Information Segment Information - MEC (Details) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) OperatingSegments ReportableSegments	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| OperatingSegments			8
Revenues	$ 4,554	$ 4,121	$ 8,720	$ 8,162
Operating income	1,049	854	2,020	1,807
Assets	87,809		$ 87,809		$ 85,440
MidAmerican Energy Company [Member]
Segment Reporting Information [Line Items]
Number of reportable segments \| ReportableSegments			2
Electric Domestic Regulated Revenue	537	481	$ 970	880
Revenues	658	584	1,353	1,209
Utilities Operating Expense, Depreciation and Amortization	141	110	258	220
Operating income	135	139	242	239
Assets	16,141		16,141		15,459
MidAmerican Energy Company [Member] \| Regulated Electric [Member]
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue	537	481	970	880
Utilities Operating Expense, Depreciation and Amortization	130	100	237	199
Operating income	128	135	195	192
Assets	14,871		14,871		14,113
MidAmerican Energy Company [Member] \| Regulated Gas [Member]
Segment Reporting Information [Line Items]
Gas Domestic Regulated Revenue	120	102	382	328
Utilities Operating Expense, Depreciation and Amortization	11	10	21	21
Operating income	7	4	47	47
Assets	1,269		1,269		1,345
MidAmerican Energy Company [Member] \| Corporate and Other [Member]
Segment Reporting Information [Line Items]
Other Revenue, Net	1	$ 1	1	$ 1
Assets	$ 1		$ 1		$ 1

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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