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Long-term Debt and Credit Agreements (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2011
Feb. 28, 2011
Mar. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
Debt Instrument [Line Items]          
Total Long-term debt       $ 7,304 $ 6,278
Less current portion       (514) (523)
Total Noncurrent Debt       6,790 5,755
Proceeds From Issuance Of Long Term Debt     1,400    
Long-Term Debt, by Maturity [Abstract]          
2011       514  
2012       14  
2013       610  
2014       607  
2015       1  
Thereafter       5,558  
Total Long-term debt       7,304 6,278
Less current portion       (514) (523)
Total Long-term debt       6,790 5,755
Long Term Debt And Credit Agreements Paragraph Details [Abstract]          
Payments Of Debt Extinguishment Costs       29  
Payments Of Debt Issuance Costs   19      
Line Of Credit Facility Current Borrowing Capacity 2,800   2,800    
Line Of Credit Facility Maximum Borrowing Capacity 3,500   3,500    
Line Of Credit Facility Borrowing Capacity Description The Credit Agreement is maintained for general corporate purposes, including support for the issuance of commercial paper        
Line Of Credit Facility Expired 2,800   2,800    
Notes 6.125% Due 2011 [Member]
         
Debt Instrument [Line Items]          
Senior Notes       500 500
Various interest rates       6.125%  
Notes 5.625% Due 2012 [Member]
         
Debt Instrument [Line Items]          
Senior Notes       0 400
Various interest rates       5.625%  
Repayment Of Notes       400  
Notes 4.25% Due 2013 [Member]
         
Debt Instrument [Line Items]          
Senior Notes       600 600
Various interest rates       4.25%  
Notes 3.875% Due 2014 [Member]
         
Debt Instrument [Line Items]          
Senior Notes       600 600
Various interest rates       3.875%  
Notes 5.40% Due 2016 [Member]
         
Debt Instrument [Line Items]          
Senior Notes       400 400
Various interest rates       5.40%  
Notes 5.30% Due 2017 [Member]
         
Debt Instrument [Line Items]          
Senior Notes       400 400
Various interest rates       5.30%  
Notes 5.30% Due 2018 [Member]
         
Debt Instrument [Line Items]          
Senior Notes       900 900
Various interest rates       5.30%  
Notes 5.0% Due 2019 [Member]
         
Debt Instrument [Line Items]          
Senior Notes       900 900
Various interest rates       5.00%  
Notes 4.25% Due 2021 [Member]
         
Debt Instrument [Line Items]          
Senior Notes       800 0
Various interest rates       4.25%  
Date of issuance       February 2011  
Notes 5.375% Due 2041 [Member]
         
Debt Instrument [Line Items]          
Senior Notes       600 0
Various interest rates       5.375%  
Date of issuance       February 2011  
Industrial Development Bond Obligations, Floating Rate Maturing At Various Dates Through 2037 [Member]
         
Debt Instrument [Line Items]          
Industrial Development Bond       37 46
Debentures 6.625% Due 2028 [Member]
         
Debt Instrument [Line Items]          
Debentures       216 216
Various interest rates       6.625%  
Debentures 9.065% Due 2033 [Member]
         
Debt Instrument [Line Items]          
Senior Notes       51 51
Various interest rates       9.065%  
Notes 5.70% Due 2036 [Member]
         
Debt Instrument [Line Items]          
Senior Notes       550 550
Various interest rates       5.70%  
Notes 5.70% Due 2037 [Member]
         
Debt Instrument [Line Items]          
Senior Notes       600 600
Various interest rates       5.70%  
Other (including capitalized leases), .6% to15.5% maturing at various dates through 2023 [Member]
         
Debt Instrument [Line Items]          
Other, including capitalized leases       $ 150 $ 115
Interest rate range minimum       0.60000  
Interest rate range maximum       15.50000