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SCHEDULE II - 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] |  |  |
Translation Adjustment | $ 214 |  |
Allowance for doubtful accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 29 | $ 25 | $ 22
Additions - Charged (Credited) To Costs And Expenses | 1 | 10 | 6
Additions - Charged to Other Accounts | (2) | 1 | 1
Write-offs Net of Recoveries | (12) | (6) | (2)
Translation Adjustment | 2 | (1) | (2)
Balance at End of Period | 18 | 29 | 25
Deferred tax asset valuation allowance |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 288 | 288 | 3,015
Additions - Charged (Credited) To Costs And Expenses | (5) | 8 | 108
Additions - Charged to Other Accounts | 0 | 0 | 0
Write-offs Net of Recoveries | (2) | (6) | (2,769)
Translation Adjustment | 6 | (2) | (66)
Balance at End of Period | $ 287 | $ 288 | $ 288

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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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