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
Dec. 31, 2012
Gain (Loss) on Derivative Instruments, Net, Pretax $ 9 $ (160) $ (64) $ (178)  
Cash and Cash Equivalents, Fair Value Disclosure 1,087   1,087    
Short term marketable securities 508   508   186
Available-for-sale securities 1,361   1,361    
Debt 1,879   1,879    
Quoted Prices In Active Markets For Identical Assets (Level 1)
         
Cash and Cash Equivalents, Fair Value Disclosure 1,053   1,053    
Short term marketable securities 0   0    
Available-for-sale securities 869   869    
Debt 0   0    
Significant Other Observable Inputs (Level 2)
         
Cash and Cash Equivalents, Fair Value Disclosure 34   34    
Short term marketable securities 508   508    
Available-for-sale securities 492   492    
Debt 1,879   1,879    
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 $ 112 $ 41 $ 336 $ 181