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Valuation and Qualifying Accounts (Schedule of Valuation and Qualifying Accounts) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for Doubtful Accounts      
Movement in Valuation Allowances and Reserves      
Balance at Beginning of Period $ 50 $ 50 $ 50
Charged to Costs and Expenses 8 8 12
Charged to Other Accounts [1] 2 3 (10)
Write-Offs and Reclassifications [2] 22 11 2
Balance at End of Period 38 50 50
Allowances for Sales Discounts      
Movement in Valuation Allowances and Reserves      
Balance at Beginning of Period 18 15 16
Charged to Costs and Expenses 247 254 256
Charged to Other Accounts [1] 0 0 (1)
Write-Offs and Reclassifications [3] 247 251 256
Balance at End of Period 18 18 15
Deferred Taxes      
Movement in Valuation Allowances and Reserves      
Balance at Beginning of Period 225 274 215
Charged to Costs and Expenses (59) (45) 78
Charged to Other Accounts 0 0 0
Write-Offs and Reclassifications [4] (10) 4 19
Balance at End of Period $ 176 $ 225 $ 274
[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.