Segment Information Segment Information - MEC (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 Energy Company [Member]
Segment Reporting Information [Line Items]
Number of reportable segments | ReportableSegments			2
Operating revenue	613	659	$ 1,294	1,501
Operating income	108	94	206	209
Interest expense	(74)	(70)	(150)	(139)
Allowance for borrowed funds	4	7	7	13
Allowance for equity funds	9	17	17	32
Other, net	21	10	16	30
Income before income tax (benefit) expense and equity income	68	58	96	145
Assets	21,048		21,048		20,564
MidAmerican Energy Company [Member] | Regulated electric
Segment Reporting Information [Line Items]
Operating revenue	518	538	989	1,080
Operating income	101	87	160	153
Assets	19,661		19,661		19,093
MidAmerican Energy Company [Member] | Regulated natural gas
Segment Reporting Information [Line Items]
Operating revenue	95	111	304	406
Operating income	7	5	46	53
Assets	1,386		1,386		1,468
MidAmerican Energy Company [Member] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating revenue	0	10	1	15
Operating income	0	$ 2	0	$ 3
Assets	$ 1		$ 1		$ 3