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Debt - Long-term Debt (Detail) - USD ($) $ in Millions | Jun. 30, 2020 | Jun. 16, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Apr. 30, 2019 | Oct. 12, 2018 | Oct. 09, 2018
--- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total long-term debt, including the current portion | $ 3,000 |  | $ 2,974 |  |  |  |
4.125% Senior Secured Notes due 2024 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate | 4.125% |  |  | 4.125% |  |  |
4.875% Senior Secured Notes due 2024 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate | 4.875% |  |  | 4.875% |  |  |
3.625% Senior Secured Notes due 2026 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate | 3.625% |  |  | 3.625% |  |  |
Acquisition Corp. | Senior Term Loan Facility due 2023 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total long-term debt, including the current portion | $ 1,315 |  | 1,313 |  |  |  |
Acquisition Corp. | 5.000% Senior Secured Notes due 2023 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total long-term debt, including the current portion | $ 298 |  | 298 |  |  |  |
Interest rate | 5.00% | 5.00% |  |  |  |  |
Acquisition Corp. | 4.125% Senior Secured Notes due 2024 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total long-term debt, including the current portion | $ 346 |  | 336 |  |  |  |
Interest rate | 4.125% |  |  |  |  | 4.125% | 4.125%
Acquisition Corp. | 4.875% Senior Secured Notes due 2024 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total long-term debt, including the current portion | $ 218 |  | 218 |  |  |  |
Interest rate | 4.875% |  |  |  |  |  | 4.875%
Acquisition Corp. | 3.625% Senior Secured Notes due 2026 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total long-term debt, including the current portion | $ 501 |  | 488 |  |  |  |
Interest rate | 3.625% |  |  |  | 3.625% |  | 3.625%
Acquisition Corp. | 5.500% Senior Notes due 2026 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total long-term debt, including the current portion | $ 322 |  | 321 |  |  |  |
Interest rate | 5.50% |  |  |  |  |  |
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, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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)(3) -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(a)(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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 4: 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 + Details
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