Income Taxes Income Taxes - MidAmerican Funding - Components of Net Deferred Income Tax Liability (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Assets and Liabilities [Line Items]
Regulatory liabilities		$ 1,610	$ 1,674
AROs		306	232
Other		590	527
Total deferred income tax assets, net		2,938	2,892
Property-related items		(10,439)	(10,185)
Regulatory assets		(631)	(656)
Other		(384)	(222)
Total deferred income tax liabilities		(12,591)	(11,939)
Net deferred income tax liability		(9,653)	(9,047)
Federal, state and foreign carryforwards		575	596
MidAmerican Funding, LLC and Subsidiaries [Domain]
Deferred Tax Assets and Liabilities [Line Items]
Regulatory liabilities		368	405
AROs		234	164
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits		26	47
Other		76	85
Total deferred income tax assets, net		704	701
Property-related items		(3,253)	(2,947)
Regulatory assets		(68)	(62)
Other		(4)	(11)
Total deferred income tax liabilities		(3,325)	(3,020)
Net deferred income tax liability		(2,621)	$ (2,319)
State and Local Jurisdiction [Member]
Deferred Tax Assets and Liabilities [Line Items]
Operating Loss Carryforwards	[1]	5,819
State and Local Jurisdiction [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain]
Deferred Tax Assets and Liabilities [Line Items]
Federal, state and foreign carryforwards		51
Operating Loss Carryforwards		$ 745
Minimum [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain]
Deferred Tax Assets and Liabilities [Line Items]
Deferred Tax Assets, Operating Loss and Tax Credit Carry Forwards, Domestic Federal and State, ExpirationDate		2020
Maximum [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain]
Deferred Tax Assets and Liabilities [Line Items]
Deferred Tax Assets, Operating Loss and Tax Credit Carry Forwards, Domestic Federal and State, ExpirationDate		2038

[1] The federal net operating loss carryforwards relate principally to net operating loss carryforwards of subsidiaries that are tax residents in both the United States and the United Kingdom. The federal net operating loss carryforwards were generated prior to Berkshire Hathaway Inc.'s ownership and will begin to expire in 2020.