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Significant Accounting Policies - Additional information (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019
Significant Accounting Policies [Line Items] |  |  |  |
Operating lease right-of-use assets |  |  |  | $ 468
Operating lease liability |  |  |  | 510
Accounting Standards Update 2016-02 [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Operating lease right-of-use assets |  |  |  | 553
Operating lease liability |  |  |  | $ 561
Cost of Sales [Member] | Error Of Principle [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Quantifying Misstatement in Current Year Financial Statements, Amount |  |  | $ 33 |
Selling and Marketing Expenses [Member] | Error Of Principle [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Quantifying Misstatement in Current Year Financial Statements, Amount | $ 44 | $ 28 |  |

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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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- Definition Amount of each individual error being corrected in the correcting adjustment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 1.N) -URI http://asc.fasb.org/extlink&oid=112272810&loc=d3e30840-122693 + Details
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