The charge, which has no tax effect, is the result of the annual impairment test and is primarily due to the decline in the market valuation of the contract drilling business. The company has not yet fully completed the measurement because of the complexities involved in determining the implied fair value of goodwill. In accordance with U.S. Generally Accepted Accounting Principles, the company anticipates that it will complete its goodwill impairment assessment by March 31, 2012. As of September 30, 2011, goodwill associated with the contract drilling services reporting unit was approximately $8 billion.
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