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Consolidated Balance Sheets (Parentheticals) (USD $)
In Millions, except Per Share data, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Statement of Financial Position [Abstract]    
Allowance for Doubtful Accounts Receivable, Current $ 63 $ 60
Accumulated depreciation 6,106 6,070
Finite-Lived Intangible Assets, Accumulated Amortization $ 225 $ 211
Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract]    
Common Stock, Par or Stated Value Per Share $ 1 $ 1
Common Stock, Shares Authorized 250 250
Common Stock, Shares, Issued 109 108
Common Stock, Shares, Outstanding 79 79
Treasury Stock, Shares 30 29