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Fair Value of Financial Assets and Liabilities, Nonrecurring (Details) (Fair Value, Measurements, Nonrecurring [Member], USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Carrying Amount [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 948 $ 1,246
Accounts receivable, net 2,989 2,866
Short-term debt 1,135 1,042
Long-term debt 6,406 7,447
Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 948 1,246
Accounts receivable, net 2,989 2,866
Short-term debt 1,137 1,051
Long-term debt $ 6,857 $ 8,040