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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]    
Accounts receivable, allowance for doubtful accounts $ 185 $ 160
Accumulated depreciation (6,055) (5,953)
Finite-lived intangible assets, accumulated amortization $ 387 $ 327
Common stock, par value (USD per share) $ 1 $ 1
Common stock, shares authorized (in shares) 250,000,000 250,000,000
Common stock, shares issued (in shares) 111,000,000 111,000,000
Common stock, shares outstanding (in shares) 74,000,000 77,000,000
Treasury stock shares (in shares) 37,000,000 33,000,000