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Valuation and Qualifying Accounts (Schedule of Valuation and Qualifying Accounts) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for Doubtful Accounts      
Movement in Valuation Allowances and Reserves      
Balance at Beginning of Period $ 38 $ 50 $ 50
Charged to Costs and Expenses 15 8 8
Charged to Other Accounts [1] (3) 2 3
Deductions [2] 14 22 11
Balance at End of Period 36 38 50
Allowances for Sales Discounts      
Movement in Valuation Allowances and Reserves      
Balance at Beginning of Period 18 18 15
Charged to Costs and Expenses 248 247 254
Charged to Other Accounts [1] (4) 0 0
Deductions [3] 245 247 251
Balance at End of Period 17 18 18
Deferred Taxes      
Movement in Valuation Allowances and Reserves      
Balance at Beginning of Period 176 225 274
Charged to Costs and Expenses 55 (59) (45)
Charged to Other Accounts 0 0 0
Deductions [4] 11 (10) 4
Balance at End of Period $ 220 $ 176 $ 225
[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.