Segment Information Segment Information - MEC (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) OperatingSegments ReportableSegments	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | OperatingSegments			8
Operating revenue	$ 4,894	$ 4,993	$ 9,504	$ 9,433
Operating income	959	972	1,878	1,843
Interest expense	(476)	(461)	(953)	(927)
Capitalized interest	17	15	33	27
Allowance for equity funds	38	24	70	45
Other, net	30	1	65	31
Income before income tax (benefit) expense and equity income	610	196	1,097	481
Assets	96,142		$ 96,142		$ 92,189
MidAmerican Energy Company [Member]
Segment Reporting Information [Line Items]
Number of reportable segments | ReportableSegments			2
Operating revenue	659	717	$ 1,501	1,463
Operating income	94	87	209	166
Interest expense	(70)	(56)	(139)	(114)
Capitalized interest	7	4	13	8
Allowance for equity funds	17	13	32	23
Other, net	10	12	30	21
Income before income tax (benefit) expense and equity income	58	60	145	104
Assets	19,027		19,027		17,920
MidAmerican Energy Company [Member] | Regulated electric
Segment Reporting Information [Line Items]
Operating revenue	538	589	1,080	1,058
Operating income	87	78	153	114
Assets	17,735		17,735		16,511
MidAmerican Energy Company [Member] | Regulated natural gas
Segment Reporting Information [Line Items]
Operating revenue	111	127	406	402
Operating income	5	8	53	51
Assets	1,289		1,289		1,406
MidAmerican Energy Company [Member] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating revenue	10	1	15	3
Operating income	2	$ 1	3	$ 1
Assets	$ 3		$ 3		$ 3