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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
Allowance for doubtful accounts, deducted from accounts receivable |  |  |
Income tax valuation allowance, deducted from deferred tax assets |  |  |
Balance at Beginning of Period | $ 32 | $ 28 | $ 28
Charged to Costs and Expenses | 95 | 83 | 57
Charged to Other Accounts | 0 | 0 | 0
Deductions | (84) | (79) | (57)
Balance at End of Period | 43 | 32 | 28
Income tax valuation allowance, deducted from deferred tax assets |  |  |
Income tax valuation allowance, deducted from deferred tax assets |  |  |
Balance at Beginning of Period | 3,794 | 1,863 | 4,116
Charged to Costs and Expenses | (3,543) | 1,934 | (151)
Charged to Other Accounts | (9) | (128) | (15)
Deductions | 0 | 125 | (2,087)
Balance at End of Period | $ 242 | $ 3,794 | $ 1,863

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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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