Quarterly report pursuant to Section 13 or 15(d)

Assets And Liabilities Measured At Fair Value Realized Unrealized Gain Loss (Details)

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Assets And Liabilities Measured At Fair Value Realized Unrealized Gain Loss (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Mar. 31, 2012
Expedia [Member]
Sep. 30, 2013
Exchangeable Senior Debentures [Member]
Sep. 30, 2012
Exchangeable Senior Debentures [Member]
Sep. 30, 2013
Exchangeable Senior Debentures [Member]
Sep. 30, 2012
Exchangeable Senior Debentures [Member]
Sep. 30, 2013
Fair Value Opition Securities [Member]
Sep. 30, 2012
Fair Value Opition Securities [Member]
Sep. 30, 2013
Fair Value Opition Securities [Member]
Sep. 30, 2012
Fair Value Opition Securities [Member]
Sep. 30, 2013
Other Credit Derivatives [Member]
Sep. 30, 2012
Other Credit Derivatives [Member]
Sep. 30, 2013
Other Credit Derivatives [Member]
Sep. 30, 2012
Other Credit Derivatives [Member]
Realized and unrealized gains on financial instruments, net $ 15 $ (160) $ (49) $ (338)   $ (15) $ (293) $ (431) $ (510) $ 31 $ 237 $ 367 $ 418 $ (1) $ (104) $ 15 $ (246) [1]
Forward Contract Indexed to Issuer's Equity, Shares         12                        
Gain (Loss) on Derivative Instruments, Net, Pretax $ 15 $ (160) $ (49) $ (338)   $ (15) $ (293) $ (431) $ (510) $ 31 $ 237 $ 367 $ 418 $ (1) $ (104) $ 15 $ (246) [1]
[1] In the first quarter of 2012, we entered into a forward contract to sell 12 million Expedia, Inc. shares at approximately $34 per share. The derivative contract was in a liability position in the prior year as the stock price of Expedia, Inc. shares had increased since the inception of the derivative contract and resulted in a recognition of unrealized losses on the contract in the prior year. The contract was settled during the fourth quarter of 2012.