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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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 | $ 77 | $ 73 | $ 59
Charged to Costs and Expenses, additions | 15 | 8 | 18
Other, additions | 0 | 0 | 0
Deductions | 10 | 4 | 4
Ending balance of valuation allowance and reserves | 82 | 77 | 73
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 | 9 | 0 | 0
Charged to Costs and Expenses, additions | 45 | 9 | 0
Other, additions | 0 | 0 | 0
Deductions | 0 | 0 | 0
Ending balance of valuation allowance and reserves | $ 54 | $ 9 | $ 0

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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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