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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS | 12 Months Ended
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Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS | SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS For the Years Ended December 31, 2020, 2019 and 2018
(In millions) | Balance at Beginning of Period |  | Charged to Costs and Expenses |  | Charged to Other Accounts |  | Deductions |  | Balance at End of Period
Allowance for credit losses, deducted from accounts receivable |  |  |  |  |  |  |  |  |
Year Ended December 31, 2020 | $ | 43 |  |  | $ | 108 |  |  | $ | — |  |  | $ | (84) |  | (a) | $ | 67 |
Year Ended December 31, 2019 | 32 |  |  | 95 |  |  | — |  |  | (84) |  | (a) | 43 |
Year Ended December 31, 2018 | 28 |  |  | 83 |  |  | — |  |  | (79) |  | (a) | 32 |
Income tax valuation allowance, deducted from deferred tax assets |  |  |  |  |  |  |  |  |
Year Ended December 31, 2020 | $ | 242 |  |  | $ | 24 |  |  | $ | — |  |  | $ | — |  |  | $ | 266 |
Year Ended December 31, 2019 | 3,794 |  |  | (3,543) |  |  | (9) |  |  | — |  |  | 242 |
Year Ended December 31, 2018 | 1,863 |  |  | 1,934 |  |  | (128) |  |  | 125 |  | (b) | 3,794 |
(a) Represents principally net amounts charged as uncollectible (b) Represents removal of NRG Yield, Inc. and its Renewables Platform due to their sale on August 31, 2018

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 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) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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