Asset Retirement Obligation Asset Retirement Obligations (Notes)

6 Months Ended

Jun. 30, 2016

Asset Retirement Obligations Disclosure [Line Items]

Asset Retirement Obligations [Text Block]

Asset Retirement Obligation

MidAmerican Energy estimates its asset retirement obligation ("ARO") liabilities based upon detailed engineering calculations of the amount and timing of the future cash spending for a third party to perform the required work. Spending estimates are escalated for inflation and then discounted at a credit-adjusted, risk-free rate. Changes in estimates could occur for a number of reasons, including changes in laws and regulations, plan revisions, inflation and changes in the amount and timing of the expected work. During the three-month period ended June 30, 2016, MidAmerican Energy recorded an increase of $69 million to its ARO liability for the decommissioning of Quad Cities Generating Station Units 1 and 2 as a result of an updated decommissioning study reflecting changes in the estimated amount and timing of cash flow.

MidAmerican Energy Company [Member]

Asset Retirement Obligations Disclosure [Line Items]

Asset Retirement Obligations [Text Block]

Asset Retirement Obligations

MidAmerican Energy estimates its asset retirement obligation ("ARO") liabilities based upon detailed engineering calculations of the amount and timing of the future cash spending for a third party to perform the required work. Spending estimates are escalated for inflation and then discounted at a credit-adjusted, risk-free rate. Changes in estimates could occur for a number of reasons, including changes in laws and regulations, plan revisions, inflation and changes in the amount and timing of the expected work. During the three-month and six-month periods ended June 30, 2016, MidAmerican Energy recorded an increase of $69 million to its ARO liability for the decommissioning of Quad Cities Generating Station Units 1 and 2 as a result of an updated decommissioning study reflecting changes in the estimated amount and timing of cash flow.

MidAmerican Funding, LLC and Subsidiaries [Domain]

Asset Retirement Obligations Disclosure [Line Items]

Asset Retirement Obligations [Text Block]

Asset Retirement Obligations

Refer to Note 7 of MidAmerican Energy's Notes to Financial Statements.