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VALUATION AND QUALIFYING ACCOUNTS | 12 Months Ended
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Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract] |
Schedule of Valuation and Qualifying Accounts Disclosure | SCHEDULE II. VALUATION AND QUALIFYING ACCOUNTS For the Years Ended December 31, 2017, 2016, and 2015
| 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, 2017 | $ | 29 |  |  | $ | 56 |  |  | $ | — |  |  | $ | (57 | ) | (a) | $ | 28 |
Year Ended December 31, 2016 | 21 |  |  | 47 |  |  | — |  |  | (39 | ) | (a) | 29 |
Year Ended December 31, 2015 | 21 |  |  | 62 |  |  | — |  |  | (62 | ) | (a) | 21 |
Income tax valuation allowance, deducted from deferred tax assets(b) |  |  |  |  |  |  |  |  |
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 |
Year Ended December 31, 2015 | 265 |  |  | 3,039 |  |  | 271 |  |  | — |  |  | 3,575 |
(a) | Represents principally net amounts charged as uncollectible.
(b) | Includes income tax valuation allowance deducted from deferred tax assets recorded as discontinued operations, which amounted to $2,087 million and $2,194 million as of December 31, 2016 and 2015, respectively.
(c) | Represents deconsolidation of GenOn due to its petition for bankruptcy on June 14, 2017.

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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- References No definition available. + Details
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