Quarterly report pursuant to Section 13 or 15(d)

Assets And Liabilities Measured At Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details)

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Assets And Liabilities Measured At Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Cash and cash equivalents $ 173   $ 173  
Realized and unrealized gains on financial instruments, net 61 (73) 158 38
Available-for-sale securities 1,239   1,239  
Fair Value, Inputs, Level 1 [Member]
       
Cash and cash equivalents 173   173  
Available-for-sale securities 865   865  
Fair Value, Inputs, Level 2 [Member]
       
Cash and cash equivalents 0   0  
Available-for-sale securities 374   374  
Non-Strategic Securities [Member]
       
Realized and unrealized gains on financial instruments, net 54 58 136 131
Other Financial Instruments [Member]
       
Realized and unrealized gains on financial instruments, net $ 7 $ (131) $ 22 $ (93)