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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash and Cash Equivalents, at Carrying Value	$ 2,806	$ 2,771	$ 1,758	$ 891
Restricted Cash and Cash Equivalents	185	425
Allowance for Doubtful Accounts Receivable	196	162
Advertising Expense	270us-gaap_AdvertisingExpense	208us-gaap_AdvertisingExpense	194us-gaap_AdvertisingExpense
Variable Interest Entity, Primary Beneficiary [Member]
Cash and Cash Equivalents, at Carrying Value	$ 944	$ 977

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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