Segment Information - MidAmerican Funding (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) reportableSegment operatingSegment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | operatingSegment	8
Revenues	$ 25,150	$ 20,952	$ 19,844
Operating income (loss)	5,327	4,291	4,150
Interest expense	2,118	2,021	1,912
Income tax (benefit) expense	(1,132)	308	(598)
Net income (loss) attributable to parent	5,790	6,943	2,950
Capitalized expenditures	6,611	6,765	7,364
Assets	132,065	127,316	100,051
Goodwill	$ 11,650	11,506	9,722
MidAmerican Funding, LLC
Segment Reporting Information [Line Items]
Number of reportable segments | reportableSegment	2
Revenues	$ 3,547	2,728	2,927
Depreciation and amortization	914	716	639
Operating income (loss)	416	454	549
Interest expense	319	322	302
Income tax (benefit) expense	(680)	(574)	(377)
Net income (loss) attributable to parent	883	818	781
Capitalized expenditures	1,912	1,836	2,810
Assets	24,531	22,711	21,840
Goodwill	1,270	1,270
MidAmerican Funding, LLC | Other
Segment Reporting Information [Line Items]
Revenues	15	16	30
Operating income (loss)	0	6	5
Interest expense	17	18	21
Income tax (benefit) expense	(6)	(4)	(5)
Net income (loss) attributable to parent	(11)	(7)	(10)
Assets	5	5	9
MidAmerican Funding, LLC | Regulated electric | Operating segments
Segment Reporting Information [Line Items]
Revenues	2,529	2,139	2,237
Depreciation and amortization	861	667	593
Operating income (loss)	358	384	473
Interest expense	279	281	259
Income tax (benefit) expense	(677)	(584)	(384)
Net income (loss) attributable to parent	844	780	739
Capitalized expenditures	1,806	1,704	2,684
Assets	22,576	21,083	20,284
Goodwill	1,191	1,191
MidAmerican Funding, LLC | Regulated natural gas | Operating segments
Segment Reporting Information [Line Items]
Revenues	1,003	573	660
Depreciation and amortization	53	49	46
Operating income (loss)	58	64	71
Interest expense	23	23	22
Income tax (benefit) expense	3	14	12
Net income (loss) attributable to parent	50	45	52
Capitalized expenditures	106	132	126
Assets	1,950	1,623	$ 1,547
Goodwill	$ 79	$ 79