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VALUATION AND QUALIFYING ACCOUNTS | 12 Months Ended
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Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Schedule of Valuation and Qualifying Accounts Disclosure | SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS For the Years Ended December 31, 2018, 2017, and 2016
| Balance at Beginning of Period |  | Charged to Costs and Expenses |  | Charged to Other Accounts |  | Deductions |  | Balance at End of Period
| (In millions)
Allowance for doubtful accounts, deducted from accounts receivable |  |  |  |  |  |  |  |  |
Year Ended December 31, 2018 | $ | 28 |  |  | $ | 83 |  |  | $ | — |  |  | $ | (79 | ) | (a) | $ | 32 |
Year Ended December 31, 2017 | 28 |  |  | 57 |  |  | — |  |  | (57 | ) | (a) | 28 |
Year Ended December 31, 2016 | 21 |  |  | 55 |  |  | — |  |  | (48 | ) | (a) | 28 |
Income tax valuation allowance, deducted from deferred tax assets |  |  |  |  |  |  |  |  |
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 |
Year Ended December 31, 2016 | 3,575 |  |  | 306 |  |  | 235 |  |  | — |  |  | 4,116 |
(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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