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Reconciliation of U.S Federal Income Tax Statutory Rate and Effective Income Tax Rate (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Line Items] |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | $ 3 | $ 0 | $ 0
Changes in valuation allowances | 6.30% | (4.70%) | (0.20%)
U.S. federal statutory rate | 21.00% | 35.00% | 35.00%
State and local income taxes, net of federal tax benefits | 5.50% | 3.80% | 2.00%
Taxes on foreign operations at rates different than statutory U.S. federal rates | (5.20%) | (3.60%) | 3.10%
Effective Income Tax Rate Reconciliation, Stock-based Compensation, Percent | (0.80%) | (3.40%) | 0.00%
Effective Income Tax Rate Reconciliation, 2017 Tax Reform Act Impact, Percent, Total | 11.20% | (100.80%) | 0.00%
Other non-deductible expenses | 1.10% | 2.20% | 1.70%
Other | (0.90%) | 0.40% | 0.00%
Effective Income Tax Rate, Continuing Operations, Total | 38.20% | (71.10%) | 41.60%

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