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
Mar. 31, 2013
Mar. 31, 2012
Cash and cash equivalents $ 1,594  
Realized and unrealized gains on financial instruments, net 97 111
Available-for-sale securities 1,235  
Fair Value, Inputs, Level 1 [Member]
   
Cash and cash equivalents 1,590  
Available-for-sale securities 801  
Fair Value, Inputs, Level 2 [Member]
   
Cash and cash equivalents 4  
Available-for-sale securities 434  
Non-Strategic Securities [Member]
   
Realized and unrealized gains on financial instruments, net 82 73
Other Financial Instruments [Member]
   
Realized and unrealized gains on financial instruments, net $ 15 $ 38