Revenue from Contracts with Customers Revenue from Contracts with Customers - MEC (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020		Jun. 30, 2019		Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 3,317		$ 3,429		$ 6,833	$ 7,116
Operating revenue	4,612		4,894		9,139	9,504
Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	102		138		220	276
Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,969		3,063		6,182	6,470
Regulated Operation [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,172		2,232		4,233	4,388
Regulated Operation [Member] | Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	104		116		338	413
Regulated Operation [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	59		86		136	242
Regulated Operation [Member] | Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	20		0		47	1
MidAmerican Energy Company [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	607		651		1,284	1,486
Operating revenue	613		659		1,294	1,501
MidAmerican Energy Company [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	6		8		10	15
MidAmerican Energy Company [Member] | Regulated electric
Disaggregation of Revenue [Line Items]
Operating revenue	518		538		989	1,080
MidAmerican Energy Company [Member] | Regulated natural gas
Disaggregation of Revenue [Line Items]
Operating revenue	95		111		304	406
MidAmerican Energy Company [Member] | Corporate and Other [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	0		10		1	15
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated retail [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	553		561		1,149	1,265
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	225		214		501	560
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	88		98		201	239
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	200		207		367	376
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		18	20
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	33	[1]	34	[1]	62	70	[1]
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	37		66		101	176
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		33	30
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	513		531		981	1,067
Operating revenue	518		538		989	1,080
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	468		466		878	910
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	166		148		314	319
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	73		79		143	154
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	197		204		360	367
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	32	[1]	35	[1]	61	70	[1]
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	28		51		70	127
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		33	30
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	5		7		8	13
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	94		110		302	404
Operating revenue	95		111		304	406
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	85		95		271	355
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	59		66		187	241
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	15		19		58	85
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		7	9
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		18	20
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	[1]	(1)	[1]	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	9		15		31	49
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	1		1		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	0		10		1	15
MidAmerican Energy Company [Member] | Unregulated Operation [Member] | Corporate and Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		10		1	15
Operating revenue	0		10		1	15
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	0		10		1	15
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	$ 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.