Joint Ventures (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended	84 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Capital contribution	$ 360	$ 411	$ 228
VCE Company LLC
Schedule of Equity Method Investments [Line Items]
Capital contribution				1,555
Accumulated stock-based compensation contributed to joint venture				17
Consolidated share of losses	64.00%	63.00%	63.00%
Loss From VCE	357	298	245	1,153
Revenue recognized from sales to VCE	$ 803	$ 439	$ 286

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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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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