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Earnings Per Share - Additional Information (Detail) - shares shares in Millions | 3 Months Ended | 6 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items] |  |  |  |
Common stock equivalents included in the computation of diluted shares outstanding (in shares) | 3 | 3 | 3 | 3
Antidilutive securities excluded from computation of earnings per share (in shares) | 1 | 1 | 2 | 1
Class B common stock |  |  |  |
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items] |  |  |  |
Weighted-average as-converted common stock used in income allocation (in shares) | 398 | 400 | 398 | 400
Class C common stock |  |  |  |
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items] |  |  |  |
Weighted-average as-converted common stock used in income allocation (in shares) | 44 | 47 | 44 | 47
UK&I preferred stock |  |  |  |
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items] |  |  |  |
Weighted-average as-converted common stock used in income allocation (in shares) | 32 | 32 | 32 | 32
Europe preferred stock |  |  |  |
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items] |  |  |  |
Weighted-average as-converted common stock used in income allocation (in shares) | 44 | 44 | 44 | 44

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 28A -URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1500-109256 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items] + References No definition available. + Details
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- Definition Weighted Average Number Shares Outstanding, As-Converted Basis + References No definition available. + Details
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