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Valuation and Qualifying Accounts (Schedule of Valuation and Qualifying Accounts) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Allowance for Doubtful Accounts      
Movement in Valuation Allowances and Reserves      
Balance at Beginning of Period $ 34 $ 32 $ 36
Charged to Costs and Expenses 12 3 2
Charged to Other Accounts [1] (4) 1 (1)
Deductions [2] 2 2 5
Balance at End of Period 40 34 32
Allowances for Sales Discounts      
Movement in Valuation Allowances and Reserves      
Balance at Beginning of Period 16 17 17
Charged to Costs and Expenses 225 240 249
Charged to Other Accounts [1] (2) (3) (4)
Deductions [3] 224 238 245
Balance at End of Period 15 16 17
Deferred Taxes      
Movement in Valuation Allowances and Reserves      
Balance at Beginning of Period 272 248 220
Charged to Costs and Expenses 12 21 26
Charged to Other Accounts 0 0 0
Deductions [4] 5 (3) (2)
Balance at End of Period $ 279 $ 272 $ 248
[1] Includes bad debt recoveries and the effects of changes in foreign currency exchange rates.
[2] Primarily uncollectible receivables written off.
[3] Sales discounts allowed.
[4] Represents the net currency effects of translating valuation allowances at current rates of exchange.