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Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Accounts Receivable, Allowance for Credit Loss, Current | $ 1 |  |
Valuation and Qualifying Accounts |  |  |
Balance at beginning of period | 40 | $ 16 | $ 17
Additions Charged to Costs and Expenses | 14 | 26 | 3
Deductions | 0 | 2 | 4
Balance at end of period | 54 | 40 | 16
Allowance for doubtful accounts [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Accounts Receivable, Allowance for Credit Loss, Current |  | 1 |
Valuation and Qualifying Accounts |  |  |
Balance at beginning of period | 1 | 1 | 5
Additions Charged to Costs and Expenses | 0 | 2 | 0
Deductions | 0 | 2 | 4
Balance at end of period | 1 | 1 | 1
Allowance for obsolete inventory parts [Member] |  |  |
Valuation and Qualifying Accounts |  |  |
Balance at beginning of period | 18 | 14 | 12
Additions Charged to Costs and Expenses | 4 | 4 | 2
Deductions | 0 | 0 | 0
Balance at end of period | 22 | 18 | 14
Valuation allowance for deferred tax assets [Member] |  |  |
Valuation and Qualifying Accounts |  |  |
Balance at beginning of period | 21 | 1 | 0
Additions Charged to Costs and Expenses | 10 | 20 | 1
Deductions | 0 | 0 | 0
Balance at end of period | $ 31 | $ 21 | $ 1

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- Definition Amount of allowance for credit loss on accounts receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446 + Details
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