Revenue from Contracts with Customers Revenue from Contracts with Customers - MEC (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		$ 4,213	$ 4,270	$ 11,329	$ 11,358
Operating revenue		5,644	5,637	15,148	15,070
Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue		124	149	400	460
Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		3,753	3,844	10,223	10,297
Regulated Operation [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		2,968	2,971	7,356	7,303
Regulated Operation [Member] | Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		77	96	490	500
Regulated Operation [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		69	80	311	306
Regulated Operation [Member] | Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0	0	1	1
MidAmerican Energy Company [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		793	828	2,279	2,277
Operating revenue		796	832	2,297	2,295
MidAmerican Energy Company [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue		3	4	18	18
MidAmerican Energy Company [Member] | Regulated electric
Disaggregation of Revenue [Line Items]
Operating revenue		712	727	1,792	1,785
MidAmerican Energy Company [Member] | Regulated natural gas
Disaggregation of Revenue [Line Items]
Operating revenue		76	103	482	505
MidAmerican Energy Company [Member] | Corporate and Other [Member]
Disaggregation of Revenue [Line Items]
Operating revenue		8	2	23	5
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated retail [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		712	730	1,977	1,967
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated retail [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		269	287	829	854
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated retail [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		111	117	350	351
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated retail [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		277	271	653	621
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated retail [Member] | Natural gas distribution, transportation-only services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		7	8	27	27
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated retail [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[1]	48	47	118	114
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		56	82	232	262
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Electricity Transmission [Member] | Multi value transmission projects [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		17	14	47	43
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		709	723	1,776	1,769
Operating revenue		712	727	1,792	1,785
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		651	647	1,561	1,539
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric | Regulated retail electric [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		228	233	547	567
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric | Regulated retail electric [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		101	100	255	251
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric | Regulated retail electric [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		274	268	641	608
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric | Regulated retail electric [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[1]	48	46	118	113
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		41	62	168	187
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric | Electricity Transmission [Member] | Multi value transmission projects [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		17	14	47	43
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue		3	4	16	16
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		76	103	480	503
Operating revenue		76	103	482	505
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas | Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		61	83	416	428
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas | Regulated retail gas [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		41	54	282	287
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas | Regulated retail gas [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		10	17	95	100
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas | Regulated retail gas [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		3	3	12	13
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas | Regulated retail gas [Member] | Natural gas distribution, transportation-only services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		7	8	27	27
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas | Regulated retail gas [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[1]	0	1	0	1
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		15	20	64	75
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue		0	0	2	2
MidAmerican Energy Company [Member] | Unregulated Operation [Member] | Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		8	2	23	5
MidAmerican Energy Company [Member] | Unregulated Operation [Member] | Corporate and Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		8	2	23	5
Operating revenue		8	2	23	5
MidAmerican Energy Company [Member] | Unregulated Operation [Member] | Corporate and Other [Member] | Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		8	2	23	$ 5
MidAmerican Energy Company [Member] | Unregulated Operation [Member] | Corporate and Other [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue		$ 0	$ 0	$ 0

[1] Other retail includes provisions for rate refunds, for which any actual refunds will be reflected in the applicable customer classes upon resolution of the related regulatory proceeding.