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CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical) - USD ($)
shares in Millions, $ in Millions
Mar. 31, 2022
Dec. 31, 2021
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 100 $ 98
Accumulated depreciation 6,696 6,619
Accumulated amortization $ 524 $ 522
Common stock, par value (in USD per share) $ 1 $ 1
Common stock, shares authorized (in shares) 250 250
Common stock, shares issued (in shares) 114 114
Common stock, shares outstanding (in shares) 57 59
Treasury stock (in shares) 57 55