Investments In Affiliates Accounted For Using The Equity Method (Schedule Of Equity Ownership And Carrying Amount) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011
Derivative, Forward Price		$ 34.316
Securities Owned and Pledged as Collateral, Description		12
Pledged Financial Instruments, Not Separately Reported, Loans Receivable Pledged as Collateral		$ 214
Investments in affiliates, accounted for using the equity method		1,152	1,135
Collateral Already Posted, Aggregate Fair Value		401
sale of a portion of an equity method affilate subsequent to period end	8.5
Proceeds from Sale of Equity Method Investments	338
Other [Member]
Investments in affiliates, accounted for using the equity method		110	113
TripAdvisor, Inc. [Member]
Percentage ownership		26.00%
Investments in affiliates, accounted for using the equity method		197	184
Equity Method Investment, Quoted Market Value		1,235
Expedia [Member]
Percentage ownership		27.00%
Investments in affiliates, accounted for using the equity method		616	621
Equity Method Investment, Quoted Market Value		1,157
HSN, Inc. [Member]
Percentage ownership		34.00%
Investments in affiliates, accounted for using the equity method		229	217
Equity Method Investment, Quoted Market Value		$ 761

sale of a portion of an equity method affilate subsequent to period end

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The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

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The forward price on the price risk forward or futures contract, such as a gas futures contract.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the aggregate value of each identified investment accounted for under the equity method of accounting based on the quoted market price for those investments in common stock for which a quoted market price is available.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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The sum of the carrying amounts, as of the date of the latest financial statement presented, of loans receivable which are owned but transferred to serve as collateral for the payment of related debt obligations, primarily secured borrowings and repurchase agreements, and for which the transferees are not permitted to sell or re-pledge them to an unrelated party.

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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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Description of financial instruments held by the entity for its own account for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions. Description may include equity, fixed income, debt or other securities.

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