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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Allowance for doubtful accounts and estimated returns |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Beginning balance of valuation allowance and reserves | $ 89 | $ 76 | $ 82
Charged to Costs and Expenses, additions | 35 | 16 | 6
Other, additions | 0 | 0 | 0
Deductions | 46 | 3 | 12
Ending balance of valuation allowance and reserves | 78 | 89 | 76
Valuation allowance for deferred tax assets |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Beginning balance of valuation allowance and reserves | 96 | 115 | 54
Charged to Costs and Expenses, additions | 27 | 31 | 68
Other, additions | 0 | 0 | 0
Deductions | 3 | 50 | 7
Ending balance of valuation allowance and reserves | $ 120 | $ 96 | $ 115

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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(Column B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: 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(Column E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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