Asset Retirement Obligation Asset Retirement Obligations (Notes)

6 Months Ended

Jun. 30, 2018

MidAmerican Energy Company [Member]

Asset Retirement Obligations Disclosure [Line Items]

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 concluded in March 2018 that it will discontinue sending CCR to surface impoundments effective April 2018 and remove all CCR material located below the water table in such facilities, the latter of which is a more extensive closure activity than previously assumed. The incremental cost and timing of such actions is not currently reasonably determinable, but an evaluation of such estimates is expected to be completed in the third quarter of 2018, with any necessary adjustments to the related asset retirement obligations recognized at that time.

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.