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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Gain (Loss) on Derivative Instruments, Net, Pretax $ 15 $ (160) $ (49) $ (338)  
Cash and Cash Equivalents, Fair Value Disclosure 600   600    
Short term marketable securities 552   552   186
Available-for-sale securities 1,339   1,339    
Debt 2,236   2,236    
Quoted Prices In Active Markets For Identical Assets (Level 1)
         
Cash and Cash Equivalents, Fair Value Disclosure 600   600    
Short term marketable securities 0   0    
Available-for-sale securities 899   899    
Debt 0   0    
Significant Other Observable Inputs (Level 2)
         
Cash and Cash Equivalents, Fair Value Disclosure 0   0    
Short term marketable securities 552   552    
Available-for-sale securities 440   440    
Debt 2,236   2,236    
Fair Value, Inputs, Level 3 [Member]
         
Cash and Cash Equivalents, Fair Value Disclosure 0   0    
Short term marketable securities 0   0    
Available-for-sale securities 0   0    
Debt 0   0    
Fair Value Opition Securities [Member]
         
Gain (Loss) on Derivative Instruments, Net, Pretax $ 31 $ 237 $ 367 $ 418