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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
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Line Items] |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | $ 0 | $ 0 | $ 1
Changes in valuation allowances | (4.70%) | (0.20%) | (0.60%)
U.S. federal statutory rate | 35.00% | 35.00% | 35.00%
State and local income taxes, net of federal tax benefits | 3.80% | 2.00% | 2.80%
Taxes on foreign operations at rates different than statutory U.S. federal rates | (3.60%) | 3.10% | 3.70%
Resolution of prior years' examination issues | 0.00% | 0.00% | (25.60%)
Effective Income Tax Rate Reconciliation, Stock-based Compensation, Percent | (3.40%) | 0.00% | 0.00%
Non-deductible transaction-related costs | 0.00% | 0.00% | 0.90%
Effective Income Tax Rate Reconciliation, 2017 Tax Reform Act Impact, Percent, Total | (100.80%) | 0.00% | 0.00%
Other non-deductible expenses | 2.20% | 1.70% | 1.80%
Other | 0.40% | 0.00% | 0.10%
Effective Income Tax Rate, Continuing Operations, Total | (71.10%) | 41.60% | 18.10%
Other Tax [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | $ 98 |  |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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