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Debt (Details 4) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Debt    
Weighted-average life of long-term debt 10 years  
Maturities    
2013 $ 250  
2015 550  
2016 429  
Thereafter 3,300  
Total 4,529  
Aggregate unamortized net discount 13 12
Other long-term obligations excluded from debt maturities 4  
Debt Covenant Compliance As of December 31, 2011, we were in compliance with the covenants contained in our credit agreements and indentures.  
Issuance period for standby letters of credit, upper limit (in days) 70 days  
Outstanding letters of credit $ 33 $ 75