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Significant Accounting Policies - Additional information (Detail) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Depreciation Amortization Impairment [Line Items] |  |
Operating lease right-of-use assets | $ 517 |
Operating lease liability | $ 538 |
Accounting Standards Update 2016-02 [Member] |  |
Depreciation Amortization Impairment [Line Items] |  |
Operating lease right-of-use assets |  | $ 553
Operating lease liability |  | $ 561

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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/disclosureRef -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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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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