Segment Information Segment Information - MidAmerican Funding (Details) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) OperatingSegments ReportableSegments	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | OperatingSegments				8
Operating revenue		$ 5,644	$ 5,637	$ 15,148	$ 15,070
Operating income		1,450	1,523	3,328	3,366
Interest expense		(475)	(453)	(1,428)	(1,380)
Capitalized interest		23	17	56	44
Allowance for equity funds		56	30	126	75
Other, net		2	19	67	50
Income before income tax (benefit) expense and equity income		847	1,423	1,944	1,904
Assets		97,913		$ 97,913		$ 92,189
MidAmerican Funding, LLC and Subsidiaries [Domain]
Segment Reporting Information [Line Items]
Number of reportable segments | ReportableSegments				2
Operating revenue		797	832	$ 2,299	2,297
Operating income		234	278	444	444
Interest expense		(74)	(61)	(223)	(185)
Capitalized interest		7	6	20	14
Allowance for equity funds		27	16	59	39
Other, net		5	12	36	35
Income before income tax (benefit) expense and equity income		199	251	336	347
Assets	[1]	20,979		20,979		19,202
MidAmerican Funding, LLC and Subsidiaries [Domain] | Regulated electric
Segment Reporting Information [Line Items]
Operating revenue		712	727	1,792	1,785
Operating income		243	278	396	392
Assets	[1]	19,532		19,532		17,702
MidAmerican Funding, LLC and Subsidiaries [Domain] | Regulated natural gas
Segment Reporting Information [Line Items]
Operating revenue		76	103	482	505
Operating income		(8)	1	45	52
Assets	[1]	1,422		1,422		1,485
MidAmerican Funding, LLC and Subsidiaries [Domain] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating revenue		9	2	25	7
Operating income		(1)	$ (1)	3	$ 0
Assets	[1]	$ 25		$ 25		$ 15

[1] (1)Consists principally of cash and cash equivalents not included in either the regulated electric or regulated natural gas segments.