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Supplemental Data (Summary of Accounts Receivable, Net) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Supplemental Data (Millions of dollars) [Abstract]    
From customers $ 2,092 $ 2,132
Other 170 153
Less allowance for doubtful accounts and sales discounts (55) (50)
Total $ 2,207 $ 2,235