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 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Mar. 31, 2012
Expedia [Member]
Jun. 30, 2013
Exchangeable Senior Debentures [Member]
Jun. 30, 2012
Exchangeable Senior Debentures [Member]
Jun. 30, 2013
Exchangeable Senior Debentures [Member]
Jun. 30, 2012
Exchangeable Senior Debentures [Member]
Jun. 30, 2013
Fair Value Opition Securities [Member]
Jun. 30, 2012
Fair Value Opition Securities [Member]
Jun. 30, 2013
Fair Value Opition Securities [Member]
Jun. 30, 2012
Fair Value Opition Securities [Member]
Jun. 30, 2013
Other Credit Derivatives [Member]
Jun. 30, 2012
Other Credit Derivatives [Member]
Jun. 30, 2013
Other Credit Derivatives [Member]
Jun. 30, 2012
Other Credit Derivatives [Member]
Realized and unrealized gains on financial instruments, net $ 9 $ (160) $ (64) $ (178)   $ (106) $ (35) $ (416) $ (217) $ 112 $ 41 $ 336 $ 181 $ 3 $ (166) [1] $ 16 $ (142) [1]
Forward Contract Indexed to Issuer's Equity, Shares         12                        
Gain (Loss) on Derivative Instruments, Net, Pretax $ 9 $ (160) $ (64) $ (178)   $ (106) $ (35) $ (416) $ (217) $ 112 $ 41 $ 336 $ 181 $ 3 $ (166) [1] $ 16 $ (142) [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.