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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
Movement in valuation and qualifying accounts |  |  |
Balance at Beginning of Period | $ 4 | $ 5 | $ 4
Charged to Costs and Expenses | 3 | 1 | 3
Charged to Other Accounts | 0 | 0 | 0
Deductions | (1) | (2) | (2)
Balance at End of Period | 7 | 4 | 5
Cumulative Effect, Period of Adoption, Adjustment |  |  |
Movement in valuation and qualifying accounts |  |  |
Balance at Beginning of Period | 1 |  |
Balance at End of Period |  | 1 |
Cumulative Effect Period of Adoption Adjusted Balance |  |  |
Movement in valuation and qualifying accounts |  |  |
Balance at Beginning of Period | 5 |  |
Balance at End of Period |  | 5 |
Valuation allowance on deferred tax assets: |  |  |
Movement in valuation and qualifying accounts |  |  |
Balance at Beginning of Period | 38 | 43 | 47
Charged to Costs and Expenses | 0 | 0 | 0
Charged to Other Accounts | 2 | 0 | 0
Deductions | (5) | (5) | (4)
Balance at End of Period | $ 35 | $ 38 | 43
Valuation allowance on deferred tax assets: | Other Comprehensive Income (Loss) |  |  |
Movement in valuation and qualifying accounts |  |  |
Deductions |  |  | (1)
Income Tax Benefit | Valuation allowance on deferred tax assets: |  |  |
Movement in valuation and qualifying accounts |  |  |
Deductions |  |  | $ (3)

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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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