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Consolidated Balance Sheets (Parenthetical) - USD ($)
shares in Millions, $ in Millions
Dec. 31, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Accounts receivable, allowance for doubtful accounts $ 132 $ 132
Accumulated depreciation 6,780 6,444
Accumulated amortization of other intangibles $ 673 $ 593
Common stock, par value (USD per share) $ 1 $ 1
Common stock, shares authorized (in shares) 250 250
Common stock, shares issued (in shares) 113 113
Common stock, shares outstanding (in shares) 63 63
Treasury stock shares (in shares) 50 49