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Fair Value Fair Value (Details 4) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Fair Value of Financial Instruments [Line Items]    
Notes Receivable, excluding Capital Leases $ 44 $ 48
Notes receivable, excluding capital leases   48
Dividends Payable Fair Value Disclosure   99
Dividends Payable, Current 207 99
Short-term borrowing   419
Short-term Debt 39 419
Long-term debt   8,757
Long-term Debt 8,041 7,682
Fair Value, Inputs, Level 1 [Member]
   
Fair Value of Financial Instruments [Line Items]    
Notes receivable, excluding capital leases 0  
Dividends Payable Fair Value Disclosure 207  
Short-term borrowing 0  
Long-term debt 316  
Fair Value, Inputs, Level 2 [Member]
   
Fair Value of Financial Instruments [Line Items]    
Notes receivable, excluding capital leases 0  
Dividends Payable Fair Value Disclosure 0  
Short-term borrowing 39  
Long-term debt 8,245  
Fair Value, Inputs, Level 3 [Member]
   
Fair Value of Financial Instruments [Line Items]    
Notes receivable, excluding capital leases 44  
Dividends Payable Fair Value Disclosure 0  
Short-term borrowing 0  
Long-term debt $ 613