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Debt - Long-term Debt (Detail) - USD ($) $ in Millions | Mar. 31, 2021 | Sep. 30, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Total long-term debt, including the current portion | $ 3,387 | $ 3,127
Issuance premium less unamortized discount and unamortized deferred financing costs | (33) | (23)
Total long-term debt, including the current portion, net | 3,354 | 3,104
Acquisition Corp. | Senior Term Loan Facility due 2023 |  |
Debt Instrument [Line Items] |  |
Total long-term debt, including the current portion | 820 | 820
Acquisition Corp. | 3.625% Senior Secured Notes due 2026 |  |
Debt Instrument [Line Items] |  |
Total long-term debt, including the current portion | 524 | 518
Acquisition Corp. | 2.750% Senior Secured Notes due 2028 |  |
Debt Instrument [Line Items] |  |
Total long-term debt, including the current portion | 383 | 379
Acquisition Corp. | 3.875% Senior Secured Notes due 2030 |  |
Debt Instrument [Line Items] |  |
Total long-term debt, including the current portion | 535 | 535
Acquisition Corp. | 3.000% Senior Secured Notes due 2031 |  |
Debt Instrument [Line Items] |  |
Total long-term debt, including the current portion | 800 | 550
Acquisition Corp. | 5.500% Senior Notes due 2026 |  |
Debt Instrument [Line Items] |  |
Total long-term debt, including the current portion | 325 | 325
Acquisition Corp. | Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Total long-term debt, including the current portion | $ 0 | $ 0

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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