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SCHEDULE II Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-09, Allowance, Credit Loss |  |  |
Allowance for valuation and qualifying accounts |  |  |
Balance at Beginning of Period | $ 36 | $ 40 | $ 31
Additions | 56 | 9 | 9
Deductions | (12) | (13) | 0
Balance at End of Period | 86 | 36 | 40
SEC Schedule, 12-09, Allowance, Credit Loss | Accounting Standards Update 2019-11 |  |  |
Allowance for valuation and qualifying accounts |  |  |
Balance at Beginning of Period | 42 |  |
Balance at End of Period |  | 42 |
Tax-Related valuation allowance |  |  |
Allowance for valuation and qualifying accounts |  |  |
Balance at Beginning of Period | 209 | 245 | 159
Additions | 119 |  | 86
Deductions |  | (36) |
Balance at End of Period | $ 328 | $ 209 | $ 245

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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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