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Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) | Dec. 31, 2018 | Jun. 30, 2018 | Jan. 01, 2018
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect of new accounting principle in period of adoption |  | $ (31,000,000) |
Accounting Standards Update 2016-02 [Member] | Scenario, Forecast [Member] | Minimum [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating lease, right-of-use asset | $ 30,000,000 |  |
Operating lease, liability | 30,000,000 |  |
Accounting Standards Update 2016-02 [Member] | Scenario, Forecast [Member] | Maximum [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating lease, right-of-use asset | 50,000,000 |  |
Operating lease, liability | $ 50,000,000 |  |
Accounting standards update 2014-09 | Retained Earnings [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  | $ 7,000,000
Accounting Standards Update 2016-01 [Member] | Retained Earnings [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  | 31,000,000
Accounting standards update 2016-16 | Retained Earnings [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  | 59,000,000
Accounting standards update 2016-16 | Non-controlling Interest [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  | $ 25,000,000

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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