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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
Allowance for doubtful accounts, deducted from accounts receivable |  |  |
Income tax valuation allowance, deducted from deferred tax assets |  |  |
Balance at Beginning of Period | $ 43 | $ 32 | $ 28
Charged to Costs and Expenses | 108 | 95 | 83
Charged to Other Accounts | 0 | 0 | 0
Deductions | (84) | (84) | (79)
Balance at End of Period | 67 | 43 | 32
Income tax valuation allowance, deducted from deferred tax assets |  |  |
Income tax valuation allowance, deducted from deferred tax assets |  |  |
Balance at Beginning of Period | 242 | 3,794 | 1,863
Charged to Costs and Expenses | 24 | (3,543) | 1,934
Charged to Other Accounts | 0 | (9) | (128)
Deductions | 0 | 0 | 125
Balance at End of Period | $ 266 | $ 242 | $ 3,794

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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(Column B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: 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(Column E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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