Segment Information - LLC (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) reportableSegment operatingSegment	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | operatingSegment			8
Operating revenue	$ 7,500	$ 6,968	$ 20,142	$ 19,113
Operating income	1,823	1,834	4,266	4,375
Interest expense	(555)	(531)	(1,637)	(1,593)
Allowance for equity funds	43	34	123	90
Other, net	5	8	(16)	64
(Loss) income before income tax benefit and equity loss	(1,895)	1,675	884	4,189
Assets	132,004		$ 132,004		$ 132,065
MidAmerican Funding, LLC
Segment Reporting Information [Line Items]
Number of reportable segments | reportableSegment			2
Operating revenue	1,148	966	$ 3,050	2,726
Operating income	230	287	420	438
Interest expense	(84)	(81)	(249)	(237)
Allowance for borrowed funds	3	4	12	8
Allowance for equity funds	12	11	41	25
Other, net	2	8	(12)	34
(Loss) income before income tax benefit and equity loss	163	229	212	268
Assets	25,312		25,312		24,531
MidAmerican Funding, LLC | Regulated electric
Segment Reporting Information [Line Items]
Operating revenue	1,009	854	2,342	1,985
Operating income	245	289	383	401
Assets	23,386		23,386		22,576
MidAmerican Funding, LLC | Regulated natural gas
Segment Reporting Information [Line Items]
Operating revenue	138	110	705	728
Operating income	(15)	(2)	37	37
Assets	1,920		1,920		1,950
MidAmerican Funding, LLC | Other
Segment Reporting Information [Line Items]
Operating revenue	1	$ 2	3	$ 13
Assets	$ 6		$ 6		$ 5