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SCHEDULE II. VALUATION AND QUALIFYING ACCOUNTS | 12 Months Ended
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Dec. 31, 2018
Valuation and Qualifying Accounts [Abstract] |
SCHEDULE II. VALUATION AND QUALIFYING ACCOUNTS | SCHEDULE II. VALUATION AND QUALIFYING ACCOUNTS For the Years Ended December 31, 2018, 2017 and 2016
|  | (In Millions) |
Column A |  | Column B |  | Column C |  |  | Column D |  |  | Column E
|  |  |  | Additions |  |  |  |  |  |
Description |  | Balance at Beginning of Period |  | Charged to Costs and Expenses |  | Charged to Other Accounts |  |  | Deductions |  |  | Balance at End of Period
Allowances for doubtful accounts, deducted from accounts receivable in the balance sheet: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 |  | $ | 13 |  |  | $ | 6 |  |  | $ | — |  |  |  | $ | (5 | ) |  | (a) | $ | 14 |
2017 |  | $ | 11 |  |  | $ | 5 |  |  | $ | — |  |  |  | $ | (3 | ) |  | (a) | $ | 13 |
2016 |  | $ | 11 |  |  | $ | 4 |  |  | $ | — |  |  |  | $ | (4 | ) |  | (a) | $ | 11 |
Valuation allowance on deferred tax assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 |  | $ | 47 |  |  | $ | — |  |  | $ | — |  |  |  | $ | (4 | ) |  | (b) | $ | 43 |
2017 |  | $ | 45 |  |  | $ | — |  |  | $ | 2 |  |  | (c) | $ | — |  |  |  | $ | 47 |
2016 |  | $ | 49 |  |  | $ | 11 |  |  | $ | — |  |  |  | $ | (15 | ) |  | (d) | $ | 45 |
(a) | Deductions, representing uncollectible accounts written off, less recoveries of accounts written off in prior years.
(b) | $3 million net reduction to valuation allowance recorded as an income tax benefit and $1 million reduction recorded primarily in other comprehensive income (loss).
(c) | $2 million adjustment to the valuation allowance was recorded primarily in other comprehensive income (loss).
(d) | Write off $13 million of deferred tax assets on certain state and local net operating loss carryforwards against the valuation allowance, as it was determined that there was only a remote likelihood that such carryforwards could be utilized; and, $2 million adjustment to the valuation allowance was recorded primarily in other comprehensive income (loss).

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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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