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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Accounts receivable, allowance for doubtful accounts $ 160 $ 154
Accumulated depreciation 5,953 5,959
Finite-lived intangible assets, accumulated amortization $ 327 $ 267
Common stock, par value (USD per share) $ 1 $ 1
Common stock, shares authorized (shares) 250,000,000 250,000,000
Common stock, shares issued (shares) 111,000,000 110,000,000
Common stock, shares outstanding (shares) 77,000,000 78,000,000
Treasury stock shares (shares) 33,000,000 32,000,000