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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
SEC Schedule, 12-09, Allowance, Credit Loss |  |  |
Allowance for valuation and qualifying accounts |  |  |
Balance at Beginning of Period | $ 40 | $ 31 | $ 28
Additions | 9 | 9 | 11
Deductions | (13) | 0 | (8)
Balance at End of Period | 36 | 40 | 31
Tax-Related valuation allowance |  |  |
Allowance for valuation and qualifying accounts |  |  |
Balance at Beginning of Period | 245 | 159 | 119
Additions |  | 86 | 40
Deductions | 36 |  |
Balance at End of Period | $ 209 | $ 245 | $ 159

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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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