Segment Information Segment Information - MEC (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) OperatingSegments ReportableSegments	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | OperatingSegments			8
Revenues	$ 5,283	$ 5,092	$ 14,003	$ 13,254
Operating income	1,624	1,585	3,644	3,392
Assets	91,054		$ 91,054		$ 85,440
MidAmerican Energy Company [Member]
Segment Reporting Information [Line Items]
Number of reportable segments | ReportableSegments			2
Electric Domestic Regulated Revenue	707	692	$ 1,677	1,572
Revenues	813	795	2,166	2,004
Utilities Operating Expense, Depreciation and Amortization	111	118	369	338
Operating income	288	284	530	523
Assets	16,902		16,902		15,459
MidAmerican Energy Company [Member] | Regulated Electric [Member]
Segment Reporting Information [Line Items]
Electric Domestic Regulated Revenue	707	692	1,677	1,572
Utilities Operating Expense, Depreciation and Amortization	101	107	338	306
Operating income	290	289	485	481
Assets	15,556		15,556		14,113
MidAmerican Energy Company [Member] | Regulated Gas [Member]
Segment Reporting Information [Line Items]
Gas Domestic Regulated Revenue	103	102	485	430
Utilities Operating Expense, Depreciation and Amortization	10	11	31	32
Operating income	(2)	(5)	45	42
Assets	1,339		1,339		1,345
MidAmerican Energy Company [Member] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Other Revenue, Net	3	$ 1	4	$ 2
Assets	$ 7		$ 7		$ 1