Segment Information Segment Information - MidAmerican Funding (Details) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) OperatingSegments ReportableSegments	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | OperatingSegments				8
Operating revenue		$ 4,612	$ 4,894	$ 9,139	$ 9,504
Operating income		936	959	1,855	1,878
Interest expense		(503)	(476)	(986)	(953)
Allowance for borrowed funds		19	17	36	33
Allowance for equity funds		38	38	72	70
Other, net		52	30	25	65
Income before income tax (benefit) expense and equity income		1,145	610	1,652	1,097
Assets		104,417		$ 104,417		$ 100,051
MidAmerican Funding, LLC and Subsidiaries [Domain]
Segment Reporting Information [Line Items]
Number of reportable segments | ReportableSegments				2
Operating revenue		616	660	$ 1,302	1,502
Operating income		110	94	212	210
Interest expense		(78)	(74)	(159)	(149)
Allowance for borrowed funds		4	7	7	13
Allowance for equity funds		9	17	17	32
Other, net		21	10	15	31
Income before income tax (benefit) expense and equity income		66	54	92	137
Assets	[1]	22,327		22,327		21,840
MidAmerican Funding, LLC and Subsidiaries [Domain] | Regulated electric
Segment Reporting Information [Line Items]
Operating revenue		518	538	989	1,080
Operating income		101	87	160	153
Assets	[1]	20,852		20,852		20,284
MidAmerican Funding, LLC and Subsidiaries [Domain] | Regulated natural gas
Segment Reporting Information [Line Items]
Operating revenue		95	111	304	406
Operating income		7	5	46	53
Assets	[1]	1,465		1,465		1,547
MidAmerican Funding, LLC and Subsidiaries [Domain] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating revenue		3	11	9	16
Operating income		2	$ 2	6	$ 4
Assets	[1]	$ 10		$ 10		$ 9

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