Income Taxes - MEC (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	21.00%	21.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	136.00%	(46.00%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	21.00%	0.00%
Effects of ratemaking	10.00%	(8.00%)
Other, net	(1.00%)	1.00%
Effective income tax rate	(217.00%)	36.00%
Production Tax Credit Carryforwards [Abstract]
Years eligible for federal renewable energy production tax credit	10 years
Recognized Renewable Energy Production Tax Credits	$ 315	$ 233
Related Party Income Tax Receivable (Payable) [Abstract]
Income tax benefit	(535)	(184)
Income before income tax expense and equity income	(246)	$ 507
Effective Income Tax Rate Reconciliation, Tax Credit, Amount	334
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 52
MidAmerican Energy Company [Member]
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	21.00%	21.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	2400.00%	(430.00%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	(29.00%)	(28.00%)
Effects of ratemaking	(186.00%)	(3.00%)
Other, net	(6.00%)	1.00%
Effective income tax rate	2200.00%	(439.00%)
Production Tax Credit Carryforwards [Abstract]
Years eligible for federal renewable energy production tax credit	10 years
Recognized Renewable Energy Production Tax Credits	$ 151	$ 120
Related Party Income Tax Receivable (Payable) [Abstract]
Income tax benefit	(154)	(123)
Income before income tax expense and equity income	(7)	28
Effective Income Tax Rate Reconciliation, Tax Credit, Amount	168
Effective Income Tax Rate Reconciliation, Regulatory Differences, Amount	13
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	2
MidAmerican Energy Company [Member] \| Berkshire Hathaway Energy [Member]
Related Party Income Tax Receivable (Payable) [Abstract]
Related party transaction, cash (paid) received for income taxes, net	$ 0	$ (46)
MidAmerican Funding, LLC and Subsidiaries [Member]
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	21.00%	21.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	1400.00%	(463.00%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	(8.00%)	(31.00%)
Effects of ratemaking	(108.00%)	(3.00%)
Other, net	(5.00%)	(1.00%)
Effective income tax rate	1300.00%	(477.00%)
Production Tax Credit Carryforwards [Abstract]
Years eligible for federal renewable energy production tax credit	10 years
Recognized Renewable Energy Production Tax Credits	$ 151	$ 120
Related Party Income Tax Receivable (Payable) [Abstract]
Income tax benefit	(156)	(124)
Income before income tax expense and equity income	(12)	26
Effective Income Tax Rate Reconciliation, Tax Credit, Amount	168
Effective Income Tax Rate Reconciliation, Regulatory Differences, Amount	13
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	3
MidAmerican Funding, LLC and Subsidiaries [Member] \| Berkshire Hathaway Energy [Member]
Related Party Income Tax Receivable (Payable) [Abstract]
Related party transaction, cash (paid) received for income taxes, net	$ 0	$ (47)

Effective Income Tax Rate Reconciliation, Regulatory Differences, Amount

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the tax effect of certain temporary differences due to state utility rate regulation.

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Renewable Energy Production Tax Credits recognized during the period.

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The amount of cash received during the current period from affiliates for refunds for the overpayment of taxes on income, net of any amounts paid during the current period.

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The number of years from its in-service date that each wind-powered generating facility is eligible for federal renewable energy production tax credits.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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