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
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Realized and unrealized gains on financial instruments, net $ (160) $ (91) $ (338) $ (61)
Non-Strategic Securities [Member]
       
Realized and unrealized gains on financial instruments, net 237 (239) 418 (90)
Exchangeable Senior Debentures [Member]
       
Realized and unrealized gains on financial instruments, net (293) 137 (510) (28)
Other [Member]
       
Realized and unrealized gains on financial instruments, net $ (104) $ 11 $ (246) $ 57