Quarterly report pursuant to Section 13 or 15(d)

Investments In Affiliates Accounted For Using The Equity Method (Schedule Of Equity Ownership And Carrying Amount) (Details)

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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