Revenue from Contracts with Customers - MEC (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Total Customer Revenue	$ 4,712	$ 3,516
Operating revenue	6,081	4,527
Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	137	118
MidAmerican Energy Company [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	1,062	677
Operating revenue	1,067	681
MidAmerican Energy Company [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	5	4
Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	4,094	3,213
Regulated Operation [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	2,108	2,061
Regulated Operation [Member] | Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	498	234
Regulated Operation [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	193	77
Regulated Operation [Member] | Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	25	27
Regulated Operation [Member] | MidAmerican Energy Company [Member] | Regulated retail [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	912	596
Regulated Operation [Member] | MidAmerican Energy Company [Member] | Regulated retail [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	469	276
Regulated Operation [Member] | MidAmerican Energy Company [Member] | Regulated retail [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	200	113
Regulated Operation [Member] | MidAmerican Energy Company [Member] | Regulated retail [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	202	167
Regulated Operation [Member] | MidAmerican Energy Company [Member] | Regulated retail [Member] | Natural gas distribution, transportation-only services [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	10	11
Regulated Operation [Member] | MidAmerican Energy Company [Member] | Regulated retail [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	31	29	[1]
Regulated Operation [Member] | MidAmerican Energy Company [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	125	64
Regulated Operation [Member] | MidAmerican Energy Company [Member] | Electricity Transmission [Member] | Multi value transmission projects [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	15	16
Unregulated Operation [Member] | MidAmerican Energy Company [Member] | Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	10	1
Electricity Us Regulated Member | MidAmerican Energy Company [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	545	471
Electricity Us Regulated Member | Regulated Operation [Member] | MidAmerican Energy Company [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	541	468
Operating revenue	545	471
Electricity Us Regulated Member | Regulated Operation [Member] | MidAmerican Energy Company [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	452	410
Electricity Us Regulated Member | Regulated Operation [Member] | MidAmerican Energy Company [Member] | Regulated retail electric [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	161	148
Electricity Us Regulated Member | Regulated Operation [Member] | MidAmerican Energy Company [Member] | Regulated retail electric [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	71	70
Electricity Us Regulated Member | Regulated Operation [Member] | MidAmerican Energy Company [Member] | Regulated retail electric [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	190	163
Electricity Us Regulated Member | Regulated Operation [Member] | MidAmerican Energy Company [Member] | Regulated retail electric [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	30	29	[1]
Electricity Us Regulated Member | Regulated Operation [Member] | MidAmerican Energy Company [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	74	42
Electricity Us Regulated Member | Regulated Operation [Member] | MidAmerican Energy Company [Member] | Electricity Transmission [Member] | Multi value transmission projects [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	15	16
Electricity Us Regulated Member | Regulated Operation [Member] | MidAmerican Energy Company [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	4	3
Natural Gas US Regulated Member | MidAmerican Energy Company [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	512	209
Natural Gas US Regulated Member | Regulated Operation [Member] | MidAmerican Energy Company [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	511	208
Operating revenue	512	209
Natural Gas US Regulated Member | Regulated Operation [Member] | MidAmerican Energy Company [Member] | Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	460	186
Natural Gas US Regulated Member | Regulated Operation [Member] | MidAmerican Energy Company [Member] | Regulated retail gas [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	308	128
Natural Gas US Regulated Member | Regulated Operation [Member] | MidAmerican Energy Company [Member] | Regulated retail gas [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	129	43
Natural Gas US Regulated Member | Regulated Operation [Member] | MidAmerican Energy Company [Member] | Regulated retail gas [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	12	4
Natural Gas US Regulated Member | Regulated Operation [Member] | MidAmerican Energy Company [Member] | Regulated retail gas [Member] | Natural gas distribution, transportation-only services [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	10	11
Natural Gas US Regulated Member | Regulated Operation [Member] | MidAmerican Energy Company [Member] | Regulated retail gas [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	1	0	[1]
Natural Gas US Regulated Member | Regulated Operation [Member] | MidAmerican Energy Company [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	51	22
Natural Gas US Regulated Member | Regulated Operation [Member] | MidAmerican Energy Company [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	1	1
Corporate and Other [Member] | MidAmerican Energy Company [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	10	1
Corporate and Other [Member] | Unregulated Operation [Member] | MidAmerican Energy Company [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	10	1
Operating revenue	10	1
Corporate and Other [Member] | Unregulated Operation [Member] | MidAmerican Energy Company [Member] | Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Total Customer Revenue	10	1
Corporate and Other [Member] | Unregulated Operation [Member] | MidAmerican Energy Company [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	$ 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.