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Debt (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Debt Instrument [Line Items]    
Total long-term debt (due 2017 and thereafter) $ 4,820,000,000 $ 3,824,000,000
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.
 
Revolving Credit Facility [Member]
   
Debt Instrument [Line Items]    
Line of credit facility, maximum borrowing capacity 2,000,000,000  
Previous Line Of Credit [Member]
   
Debt Instrument [Line Items]    
Line of credit facility, maximum borrowing capacity   1,200,000,000
Senior Notes Due 2019 [Member]
   
Debt Instrument [Line Items]    
Interest rate (in hundredths) 6.15% 6.15%
Maturity date September 2019 September 2019
Total long-term debt 997,000,000 997,000,000
Senior Notes Due 2039 [Member]
   
Debt Instrument [Line Items]    
Interest rate (in hundredths) 7.45% 7.45%
Maturity date September 2039 September 2039
Total long-term debt 995,000,000 995,000,000
Senior Notes Due 2038 [Member]
   
Debt Instrument [Line Items]    
Interest rate (in hundredths) 6.70% 6.70%
Maturity date September 2038 September 2038
Total long-term debt 800,000,000 800,000,000
Senior Notes Due Nov 2021 [Member]
   
Debt Instrument [Line Items]    
Interest rate (in hundredths) 3.25%  
Maturity date November 2021  
Total long-term debt 498,000,000 0
Senior Notes Due 2041 [Member]
   
Debt Instrument [Line Items]    
Interest rate (in hundredths) 4.50%  
Maturity date November 2041  
Total long-term debt 498,000,000 0
Senior Notes Due 2018 [Member]
   
Debt Instrument [Line Items]    
Interest rate (in hundredths) 5.90% 5.90%
Maturity date September 2018 September 2018
Total long-term debt 400,000,000 400,000,000
Senior Debentures Due 2096 [Member]
   
Debt Instrument [Line Items]    
Interest rate (in hundredths) 7.60% 7.60%
Maturity date August 2096 August 2096
Total long-term debt 293,000,000 293,000,000
Debt instruments non-call feature description
may not be redeemed prior to maturity
 
Senior Debentures Due Feb 2021 [Member]
   
Debt Instrument [Line Items]    
Interest rate (in hundredths) 8.75% 8.75%
Maturity date February 2021 February 2021
Total long-term debt 184,000,000 184,000,000
Debt instruments non-call feature description
may not be redeemed prior to maturity
 
Other long-term debt [Member]
   
Debt Instrument [Line Items]    
Total long-term debt $ 155,000,000 $ 155,000,000