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Ventures and Variable Interest Entities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Variable Interest Entity [Line Items]
Equity in net earnings (loss) of affiliates	$ 48	$ 40
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Ownership percentage	50.00%
Expected production capacity per year	1,300,000

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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