Segment Information Segment Information - MEC (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) OperatingSegments ReportableSegments	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | OperatingSegments	8
Operating revenue	$ 4,527	$ 4,610
Operating income	919	919
Interest expense	(483)	(477)
Allowance for borrowed funds	17	16
Allowance for equity funds	34	32
Other, net	(27)	35
Income before income tax (benefit) expense and equity income	507	487
Assets	$ 100,806		$ 100,051
MidAmerican Energy Company [Member]
Segment Reporting Information [Line Items]
Number of reportable segments | ReportableSegments	2
Operating revenue	$ 681	842
Operating income	98	115
Interest expense	(76)	(69)
Allowance for borrowed funds	3	6
Allowance for equity funds	8	15
Other, net	(5)	20
Income before income tax (benefit) expense and equity income	28	87
Assets	20,591		20,564
MidAmerican Energy Company [Member] | Regulated electric
Segment Reporting Information [Line Items]
Operating revenue	471	542
Operating income	59	66
Assets	19,184		19,093
MidAmerican Energy Company [Member] | Regulated natural gas
Segment Reporting Information [Line Items]
Operating revenue	209	295
Operating income	39	48
Assets	1,407		1,468
MidAmerican Energy Company [Member] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating revenue	1	5
Operating income	0	$ 1
Assets	$ 0		$ 3