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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS | 12 Months Ended
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Dec. 31, 2019
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, 2019, 2018, and 2017
(In millions) | Balance at Beginning of Period |  | Charged to Costs and Expenses |  | Charged to Other Accounts |  | Deductions |  | Balance at End of Period
Allowance for doubtful accounts, deducted from accounts receivable |  |  |  |  |  |  |  |  |
Year Ended December 31, 2019 | $ | 32 |  |  | $ | 95 |  |  | $ | — |  |  | $ | (84) |  | (a) | $ | 43 |
Year Ended December 31, 2018 | 28 |  |  | 83 |  |  | — |  |  | (79) |  | (a) | 32 |
Year Ended December 31, 2017 | 28 |  |  | 57 |  |  | — |  |  | (57) |  | (a) | 28 |
Income tax valuation allowance, deducted from deferred tax assets |  |  |  |  |  |  |  |  |
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 |
Year Ended December 31, 2017 | 4,116 |  |  | (151) |  |  | (15) |  |  | (2,087) |  | (c) | 1,863 |
(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 (c) Represents deconsolidation of GenOn due to its petition for bankruptcy on June 14, 2017

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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=26873400&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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