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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, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | $ 36 | $ 38 | $ 34
Expensed | 34 | 29 | 27
Other Adjustments | (2) | 3 | (2)
Deductions | (29) | (34) | (21)
Balance at End of Period | 39 | 36 | 38
Tax Valuation Allowance |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 331 | 357 | 351
Expensed | (3) | 0 | 17
Other Adjustments | (17) | 13 | 3
Deductions | 0 | (39) | (14)
Balance at End of Period | $ 311 | $ 331 | $ 357

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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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