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SCHEDULE II. VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Movement in valuation and qualifying accounts |  |  |
Balance at Beginning of Period | $ 5 | $ 4 | $ 5
Additions, Charged to Costs and Expenses | 1 | 3 | 1
Additions, Charged to Other Accounts | 0 | 0 | 0
Deductions | (2) | (2) | (2)
Balance at End of Period | 4 | 5 | 4
Valuation Allowance on deferred tax assets |  |  |
Movement in valuation and qualifying accounts |  |  |
Balance at Beginning of Period | 43 | 47 | 45
Additions, Charged to Costs and Expenses | 0 | 0 | 0
Additions, Charged to Other Accounts | 0 | 0 | 2
Deductions | (5) | (4) | 0
Balance at End of Period | $ 38 | 43 | $ 47
Valuation Allowance on deferred tax assets | Other Comprehensive Income (Loss) |  |  |
Movement in valuation and qualifying accounts |  |  |
Deductions |  | (1) |
Income Tax Benefit [Member] | 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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