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Fair Value of Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Long-term debt, including current portion $ 16,457 $ 15,866
Carrying Amount
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Notes receivable 97 [1] 88 [1]
Long-term debt, including current portion 16,457 15,866
Fair Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Notes receivable 97 [1] 88 [1]
Long-term debt, including current portion $ 17,133 $ 16,492
[1] Includes the current portion of notes receivable which is recorded in prepayments and other current assets on the Company's consolidated balance sheets