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Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract] |
Valuation and Qualifying Accounts | Valuation and Qualifying Accounts (In millions)
Description | Balance at Beginning of Period |  | Charged to Costs and Expenses |  | Deductions |  | Balance at End of Period
Valuation account for accounts receivable: |  |  |  |  |  |  |
Year ended December 31, 2017 | $ | 3 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 3 |
Year ended December 31, 2016 | 6 |  |  | — |  |  | 3 |  |  | 3 |
Year ended December 31, 2015 | 1 |  |  | 5 |  |  | — |  |  | 6 |
Valuation account for deferred tax assets: |  |  |  |  |  |  |
Year ended December 31, 2017 | $ | 47 |  |  | $ | 91 |  |  | $ | 4 |  |  | $ | 134 |
Year ended December 31, 2016 | 48 |  |  | 18 |  |  | 19 |  |  | 47 |
Year ended December 31, 2015 | 57 |  |  | 5 |  |  | 14 |  |  | 48 |
See accompanying report of independent registered public accounting firm.

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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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