Revenue from Contract with Customer Revenue from Contract with Customer - MEC (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 14,837	$ 14,972
Revenues	19,844	19,787	$ 18,614
Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	534	601
MidAmerican Energy Company and Subsidiaries [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,902	3,028
Revenues	2,925	3,049	2,837
MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,508	2,551
MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,055	1,117
MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	454	467
MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	816	780
MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail [Member] | Natural gas distribution, transportation-only services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	38	39
MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	145	148
MidAmerican Energy Company and Subsidiaries [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	309	411
MidAmerican Energy Company and Subsidiaries [Member] | Electricity Transmission [Member] | Multi value transmission projects [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	57	55
MidAmerican Energy Company and Subsidiaries [Member] | Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	28	11
MidAmerican Energy Company and Subsidiaries [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	23	21
Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	13,433	13,612
Regulated Operation [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	9,465	9,419
Regulated Operation [Member] | Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	686	737
Regulated Operation [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	457	501
Regulated Operation [Member] | Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2	2
Electricity, US Regulated [Member] | MidAmerican Energy Company and Subsidiaries [Member]
Disaggregation of Revenue [Line Items]
Revenues	2,237	2,283	2,108
Electricity, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,216	2,265
Revenues	2,237	2,283
Electricity, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,938	1,915
Electricity, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail electric [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	672	696
Electricity, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail electric [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	322	314
Electricity, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail electric [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	799	758
Electricity, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail electric [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	145	147
Electricity, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	221	295
Electricity, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Electricity Transmission [Member] | Multi value transmission projects [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	57	55
Electricity, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	21	18
Natural Gas, US Regulated [Member] | MidAmerican Energy Company and Subsidiaries [Member]
Disaggregation of Revenue [Line Items]
Revenues	660	754	719
Natural Gas, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	658	752
Revenues	660	754
Natural Gas, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	570	636
Natural Gas, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail gas [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	383	421
Natural Gas, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail gas [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	132	153
Natural Gas, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail gas [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	17	22
Natural Gas, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail gas [Member] | Natural gas distribution, transportation-only services [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	38	39
Natural Gas, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Regulated retail gas [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0	1
Natural Gas, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	88	116
Natural Gas, US Regulated [Member] | Regulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	2	2
Corporate and Other [Member] | MidAmerican Energy Company and Subsidiaries [Member]
Disaggregation of Revenue [Line Items]
Revenues	28	12	$ 10
Corporate and Other [Member] | Nonregulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	28	11
Revenues	28	12
Corporate and Other [Member] | Nonregulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	28	11
Corporate and Other [Member] | Nonregulated Operation [Member] | MidAmerican Energy Company and Subsidiaries [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 0	$ 1