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Valuation and Qualifying Accounts (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Allowance for Trade Receivables [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | $ 15 | $ 12 | $ 7
Charged to costs and expenses |  |  | 3
Additions/ (Deductions) |  | 3 | 2
Balance at end of period | 15 | 15 | 12
Valuation Allowance of Deferred Tax Assets [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | 1,502 | 1,578 | 1,585
Translation adjustment | (16) | 24 | (4)
Charged to costs and expenses | 143 | 3 | 13
Additions/ (Deductions) | (81) | (103) | (16)
Balance at end of period | $ 1,548 | $ 1,502 | $ 1,578

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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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