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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Accounts receivable, allowance for doubtful accounts $ 132 $ 136
Accumulated depreciation 6,444 6,190
Finite-lived intangible assets, accumulated amortization $ 593 $ 527
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) 112,000,000 112,000,000
Common stock, shares outstanding (in shares) 63,000,000 64,000,000
Treasury stock shares (in shares) 49,000,000 48,000,000