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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Valuation and Qualifying Accounts |  |  |
Balance at beginning of period | $ 54 | $ 40 | $ 16
Additions Charged to Costs and Expenses | 49 | 20 | 30
Deductions | 5 | 6 | 6
Balance at end of period | 98 | 54 | 40
Valuation allowance for deferred tax assets |  |  |
Valuation and Qualifying Accounts |  |  |
Balance at beginning of period | 31 | 21 | 1
Additions Charged to Costs and Expenses | 38 | 10 | 20
Deductions | 0 | 0 | 0
Balance at end of period | 69 | 31 | 21
Allowance for obsolete inventory parts |  |  |
Valuation and Qualifying Accounts |  |  |
Balance at beginning of period | 22 | 18 | 14
Additions Charged to Costs and Expenses | 5 | 4 | 4
Deductions | 0 | 0 | 0
Balance at end of period | 27 | 22 | 18
Allowance for doubtful accounts |  |  |
Valuation and Qualifying Accounts |  |  |
Balance at beginning of period | 1 | 1 | 1
Additions Charged to Costs and Expenses | 6 | 6 | 6
Deductions | 5 | 6 | 6
Balance at end of period | $ 2 | $ 1 | $ 1

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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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