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Details of Consolidated Statements of Cash Flows - Components of Cash and Cash Equivalents (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash and Cash Equivalents [Abstract]
Bank term deposits, bankers' acceptances and government paper	$ 1,058us-gaap_CashEquivalentsAtCarryingValue	$ 1,331us-gaap_CashEquivalentsAtCarryingValue
Cash	195us-gaap_Cash	223us-gaap_Cash
Cash and cash equivalents	$ 1,253	$ 1,554	$ 1,522	$ 1,325

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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