Acquisition of Atlas Energy, Inc. (Details) (USD $) In Millions	Feb. 17, 2011
Preliminary allocation of the purchase price to Atlas's assets and liabilities
Current assets	$ 150
Investments and long-term receivables	456
Properties	6,051
Goodwill	39
Other assets	5
Total assets acquired	6,701
Current liabilities	(560)
Long-term debt and capital leases	(761)
Deferred income taxes	(1,918)
Other liabilities	(25)
Total liabilities assumed	(3,264)
Net assets acquired	$ 3,437

Investments and Long-term receivables.

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Long-term debt and capital leases.

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The amount of acquisition cost of a business combination allocated to assets acquired.

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The total purchase price of the acquired entity. This includes cash paid to equity interest holders of the acquired entity, fair value of debt and equity securities issued to equity holders of the acquired entity, and transaction costs paid to third parties to consummate the acquisition.

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The amount of acquisition cost of a business combination allocated to current assets.

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The amount of acquisition cost of a business combination allocated to current liabilities of the acquired entity.

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Amount of deferred tax assets or liabilities for the differences between the values assigned and the tax bases of assets and liabilities in a business combination, net of any valuation allowance for deferred tax assets.

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Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

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The amount of acquisition cost of a business combination allocated to other noncurrent liabilities of the acquired entity.

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The amount of acquisition cost of a business combination allocated to land and building to be used in the normal course of business, not including assets that are held-for-sale.

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