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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS Valuation and Qualifying Accounts (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Allowance for doubtful accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | $ 12 | $ 19 | $ 22
Provision/reversals Charged to Costs & Expenses | 2 | (6) | 3
Charged to Other Accounts | 0 | 0 | 0
Deductions | 0 | 1 | 6
Balance at End of Period | 14 | 12 | 19
Deferred tax valuation allowance |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 32 | 26 | 25
Provision/reversals Charged to Costs & Expenses | 7 | 6 | 1
Charged to Other Accounts | 0 | 0 | 0
Deductions | 0 | 0 | 0
Balance at End of Period | 39 | $ 32 | $ 26
Marketing Applications | Allowance for doubtful accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Deductions | $ 5 |  |

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: 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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