Annual report pursuant to Section 13 and 15(d)

Aggregate Minimum Lease Payments , Annual Principal Payments and Amounts Expected to be Spent for Purchase Commitments (Detail)

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Aggregate Minimum Lease Payments , Annual Principal Payments and Amounts Expected to be Spent for Purchase Commitments (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Capital Leases    
2012 $ 59  
2013 56  
2014 51  
2015 50  
2016 48  
After 2016 474  
Total 738  
Less: imputed interest (269)  
Present value of minimum capitalized lease payments 469  
Less: current portion (33)  
Long-term capitalized lease obligations 436  
Operating Leases    
2012 329  
2013 257  
2014 192  
2015 140  
2016 97  
After 2016 393  
Total 1,408  
Debt Principal    
2012     
2013 1,750  
2014 1,000  
2015 100  
2016     
After 2016 7,366  
Total 11,128 10,846
Purchase Commitments    
2012 517  
2013 453  
2014 32  
2015 16  
2016 34  
After 2016     
Total $ 1,052