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Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance at Beginning of Period |  | $ 1,336 | $ 1,264 | $ 1,022
Additions, Charged to Costs and Expenses |  | 131 | 350 | 402
Additions, Charged to Other Accounts | [1] | 19 | (2) | (23)
Deductions | [2] | 113 | 276 | 137
Balance at End of Period |  | 1,373 | 1,336 | 1,264
Allowance for trade receivables |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance at Beginning of Period |  | 35 | 40 | 50
Additions, Charged to Costs and Expenses |  | 10 | 2 | 3
Additions, Charged to Other Accounts | [1] | (1) | (4) | (6)
Deductions | [2] | 2 | 3 | 7
Balance at End of Period |  | 42 | 35 | 40
Allowance for other current receivables |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance at Beginning of Period |  | 44 | 47 | 98
Additions, Charged to Costs and Expenses |  | 1 | (1) | (10)
Additions, Charged to Other Accounts | [1] | (1) | 1 | (24)
Deductions | [2] | 2 | 3 | 17
Balance at End of Period |  | 42 | 44 | 47
Allowance for long-term receivables |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance at Beginning of Period |  | 14 | 24 | 21
Additions, Charged to Costs and Expenses |  | 1 | 0 | 0
Additions, Charged to Other Accounts | [1] | (3) | 0 | 3
Deductions | [2] | 0 | 10 | 0
Balance at End of Period |  | 12 | 14 | 24
Valuation allowance for deferred taxes |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance at Beginning of Period |  | 1,243 | 1,153 | 853
Additions, Charged to Costs and Expenses |  | 119 | 349 | 409
Additions, Charged to Other Accounts | [1] | 24 | 1 | 4
Deductions | [2] | 109 | 260 | 113
Balance at End of Period |  | $ 1,277 | $ 1,243 | $ 1,153
[1] | Primarily related to divestitures, acquisitions and currency translation.
[2] | Represents charges for which allowances were created.

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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=120395691&loc=d3e24092-122690 + Details
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