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Indebtedness Long-Term Debt (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
Long term debt obligations $ 18,108 $ 17,034
Long-term Debt, Current 3,284 2,206
Long-term Debt 14,824 14,828
US Dollar Notes [Member] | U.S. Dollar Notes [Member]
   
Debt Instrument [Line Items]    
Long-term Debt 12,493 11,269
Due through 2042  
Interest rate, minimum 1.625%  
Interest rate, maximum 6.875%  
Interest rate, average 4.81%  
Foreign Currency Obligations [Member] | Euro Notes [Member]
   
Debt Instrument [Line Items]    
Long-term Debt 3,511 3,533
Due through 2024  
Interest rate, minimum 2.125%  
Interest rate, maximum 5.875%  
Interest rate, average 4.227%  
Foreign Currency Obligations [Member] | Swiss Franc Notes [Member]
   
Debt Instrument [Line Items]    
Long-term Debt 1,679 1,719
Due through 2021  
Interest rate, minimum 1.00%  
Interest rate, maximum 4.00%  
Interest rate, average 2.801%  
Foreign Currency Obligations [Member] | Other [Member]
   
Debt Instrument [Line Items]    
Long term debt obligations $ 425 $ 513
Due through 2024  
Interest rate, average 3.303%