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CONDENSED CONSOLIDATED BALANCE SHEETS (PARENTHETICAL) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 29 $ 27
Cumulative preferred stock, par value (in dollars per share) $ 5 $ 5
Cumulative preferred stock, shares authorized 12,000,000 12,000,000
Cumulative preferred stock, shares issued 0 0
Cumulative preferred stock, shares outstanding 0 0
Common stock, par value (in dollars per share) $ 0.50 $ 0.50
Common stock, shares authorized 300,000,000 300,000,000
Common stock, shares issued 109,659,219 109,659,219
Treasury stock, shares at cost 58,139,172 57,134,828