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Valuation and Qualifying Accounts (Schedule of Valuation and Qualifying Accounts) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Allowance for Doubtful Accounts |  |  |  |
Movement in Valuation Allowances and Reserves |  |  |  |
Balance at Beginning of Period |  | $ 32 | $ 36 | $ 38
Charged to Costs and Expenses |  | 3 | 2 | 15
Charged to Other Accounts | [1] | 1 | (1) | (3)
Deductions | [2] | 2 | 5 | 14
Balance at End of Period |  | 34 | 32 | 36
Allowances for Sales Discounts |  |  |  |
Movement in Valuation Allowances and Reserves |  |  |  |
Balance at Beginning of Period |  | 17 | 17 | 18
Charged to Costs and Expenses |  | 240 | 249 | 248
Charged to Other Accounts | [1] | (3) | (4) | (4)
Deductions | [3] | 238 | 245 | 245
Balance at End of Period |  | 16 | 17 | 17
Deferred Taxes |  |  |  |
Movement in Valuation Allowances and Reserves |  |  |  |
Balance at Beginning of Period |  | 248 | 220 | 176
Charged to Costs and Expenses |  | 21 | 26 | 55
Charged to Other Accounts |  | 0 | 0 | 0
Deductions | [4] | (3) | (2) | 11
Balance at End of Period |  | $ 272 | $ 248 | $ 220
[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.

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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