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Debt (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
Long-term debt $ 4,820,000,000 $ 4,820,000,000
Debt instrument call feature description We may redeem all of our senior notes from time to time or all of the notes of each series at any time at the applicable redemption prices, plus accrued and unpaid interest.  
Line of credit facility revolving period (years) 5 years  
Long-term debt due in 2017 45,000,000  
Revolving Credit Facility
   
Debt Instrument [Line Items]    
Line of credit facility, maximum borrowing capacity 2,000,000,000  
Senior Notes Due 2019
   
Debt Instrument [Line Items]    
Long-term debt 997,000,000  
Maturity date September 2019  
Interest rate (in hundredths) 6.15%  
Senior Notes Due 2039
   
Debt Instrument [Line Items]    
Long-term debt 995,000,000  
Maturity date September 2039  
Interest rate (in hundredths) 7.45%  
Senior Notes Due 2038
   
Debt Instrument [Line Items]    
Long-term debt 800,000,000  
Maturity date September 2038  
Interest rate (in hundredths) 6.70%  
Senior Notes Due Nov 2021
   
Debt Instrument [Line Items]    
Long-term debt 498,000,000  
Maturity date November 2021  
Interest rate (in hundredths) 3.25%  
Senior Notes Due 2041
   
Debt Instrument [Line Items]    
Long-term debt 498,000,000  
Maturity date November 2041  
Interest rate (in hundredths) 4.50%  
Senior Notes Due 2018
   
Debt Instrument [Line Items]    
Long-term debt 400,000,000  
Maturity date September 2018  
Interest rate (in hundredths) 5.90%  
Senior Debentures Due 2096
   
Debt Instrument [Line Items]    
Long-term debt 293,000,000  
Maturity date August 2096  
Interest rate (in hundredths) 7.60%  
Debt instruments non-call feature description may not be redeemed prior to maturity  
Senior Debentures Due Feb 2021
   
Debt Instrument [Line Items]    
Long-term debt 184,000,000  
Maturity date February 2021  
Interest rate (in hundredths) 8.75%  
Other
   
Debt Instrument [Line Items]    
Long-term debt $ 155,000,000