Segment Information Segment Information - MEC (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) OperatingSegments ReportableSegments	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | OperatingSegments			8
Operating revenue	$ 6,193	$ 5,644	$ 15,332	$ 15,148
Operating income	1,547	1,450	3,402	3,328
Interest expense	(504)	(475)	(1,490)	(1,428)
Allowance for borrowed funds	24	23	60	56
Allowance for equity funds	50	56	122	126
Other, net	36	2	61	67
Income before income tax (benefit) expense and equity income	2,967	847	4,619	1,944
Assets	109,186		$ 109,186		$ 100,051
MidAmerican Energy Company [Member]
Segment Reporting Information [Line Items]
Number of reportable segments | ReportableSegments			2
Operating revenue	812	796	$ 2,106	2,297
Operating income	232	234	438	443
Interest expense	(74)	(68)	(224)	(207)
Allowance for borrowed funds	5	7	12	20
Allowance for equity funds	16	27	33	59
Other, net	14	4	30	34
Income before income tax (benefit) expense and equity income	193	204	289	349
Assets	21,268		21,268		20,564
MidAmerican Energy Company [Member] | Regulated electric
Segment Reporting Information [Line Items]
Operating revenue	728	712	1,717	1,792
Operating income	238	243	398	396
Assets	19,782		19,782		19,093
MidAmerican Energy Company [Member] | Regulated natural gas
Segment Reporting Information [Line Items]
Operating revenue	80	76	384	482
Operating income	(6)	(8)	40	45
Assets	1,479		1,479		1,468
MidAmerican Energy Company [Member] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating revenue	4	8	5	23
Operating income	0	$ (1)	0	$ 2
Assets	$ 7		$ 7		$ 3