Asset Retirement Obligation Asset Retirement Obligations (Notes)

6 Months Ended

Jun. 30, 2019

Asset Retirement Obligations Disclosure [Line Items]

Schedule of Change in Asset Retirement Obligation [Table Text Block]

Asset Retirement Obligations

In January 2018, MidAmerican Energy completed groundwater testing at its coal combustion residuals ("CCR") surface impoundments. Based on this information, MidAmerican Energy discontinued sending CCR to surface impoundments effective April 2018 and initiated analysis of additional actions to be taken. As a result of that analysis, MidAmerican Energy will remove all CCR material located below the water table and cap the material in such facilities, which is a more extensive closure activity than previously assumed. In the first quarter of 2019, MidAmerican Energy increased the asset retirement obligations for its fossil-fueled generating facilities by $237 million related to the cost of this closure activity. Closure activity on the six existing surface impoundments is estimated to extend through 2023.

MidAmerican Energy Company [Member]

Asset Retirement Obligations Disclosure [Line Items]

Schedule of Change in Asset Retirement Obligation [Table Text Block]

The following table reconciles the beginning and ending balances of MidAmerican Energy's ARO liabilities for the six-month period endedJune 30, 2019 (in millions):

Beginning balance	$	562
Change in estimated costs	237
Retirements	(1		)
Accretion	14
Ending balance	$	812

Asset Retirement Obligation Disclosure [Text Block]

Asset Retirement Obligations

In January 2018, MidAmerican Energy completed groundwater testing at its coal combustion residuals ("CCR") surface impoundments. Based on this information, MidAmerican Energy discontinued sending CCR to surface impoundments effective April 2018 and initiated analysis of additional actions to be taken. As a result of that analysis, MidAmerican Energy will remove all CCR material located below the water table and cap the material in such facilities, which is a more extensive closure activity than previously assumed. In the first quarter of 2019, MidAmerican Energy increased the asset retirement obligations for its fossil-fueled generating facilities by $237 million related to the cost of this closure activity. Closure activity on the six existing surface impoundments is estimated to extend through 2023. The following table reconciles the beginning and ending balances of MidAmerican Energy's ARO liabilities for the six-month period endedJune 30, 2019 (in millions):

Beginning balance	$	562
Change in estimated costs	237
Retirements	(1		)
Accretion	14
Ending balance	$	812

MidAmerican Funding, LLC and Subsidiaries [Domain]

Asset Retirement Obligations Disclosure [Line Items]

Asset Retirement Obligation Disclosure [Text Block]

Asset Retirement Obligations

Refer to Note 8 of MidAmerican Energy's Notes to Financial Statements.