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Tax - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Tax Credit Carryforward [Line Items] |  |  |  |  |
Effective tax rate | (9.60%) | 18.80% | 6.50% | 30.40% |
Increase in valuation allowance |  |  | $ 213 |  |
U.S. federal statutory rate |  |  | 35.00% |  |
Unrecognized tax benefit | $ 66 |  | $ 66 |  |
Non-current deferred tax assets reclassified to non-current deferred tax liabilities | $ 135 |  | $ 135 |  | $ 130
Accounting Standards Update 2015-17 [Member] |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |
Current deferred tax assets reclassified to non-current deferred tax liabilities |  |  |  |  | 376
Non-current deferred tax assets reclassified to non-current deferred tax liabilities |  |  |  |  | 358
Current deferred tax liabilities reclassified to non-current deferred tax liabilities |  |  |  |  | $ 291

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- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, with jurisdictional netting and classified as current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=75116654&loc=d3e31958-109318 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=75116654&loc=d3e31917-109318 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=75116654&loc=d3e31931-109318 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32632-109319 + Details
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