Related Party Transactions - Transactions with Significant Shareholders, their Affiliates and Other Related Parties (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Party Transactions [Abstract]
Sales & other services	$ 24us-gaap_RevenueFromRelatedParties	$ 118us-gaap_RevenueFromRelatedParties	$ 226us-gaap_RevenueFromRelatedParties
Research and development expenses		121	282
Other purchases	24	71	53
Accounts receivable	22us-gaap_DueFromRelatedParties	12us-gaap_DueFromRelatedParties	53us-gaap_DueFromRelatedParties
Accounts payable	$ 56	$ 82	$ 62

For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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Carrying amount as of the balance sheet date of obligations due all related parties.

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- Definition

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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