Asset Retirement Obligation (Notes)

6 Months Ended

Jun. 30, 2019

Asset Retirement Obligation Disclosure [Abstract]

Asset Retirement Obligation Disclosure [Text Block]

ASSET RETIREMENT OBLIGATION

During the six months ended June 30, 2019, the Company decreased the asset retirement obligation at DPL by $23 million, resulting in a reduction to Cost of Sales on the Condensed Consolidated Statement of Operations as the related plants are no longer in service. This decrease was due to reductions in estimated closure costs associated with ash ponds and landfills. The Company uses the cost approach to determine the initial value of ARO liabilities, which is estimated by discounting expected cash outflows to their present value using market-based rates at the initial recording of the liabilities. Cash outflows are based on the approximate future disposal costs as determined by market information, historical information or other management estimates. Subsequent downward revisions of ARO liabilities are discounted using the market-based rates that existed when the liability was initially recognized.