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Senior Notes (Detail) - USD ($) | Dec. 17, 2021 | Dec. 06, 2019 | May 08, 2018 | Jun. 30, 2022 | Sep. 30, 2021
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Carrying value of Senior Notes |  |  |  | $ 1,300,000,000 | $ 750,000,000
Fair value of Senior Notes |  |  |  | 1,189,000,000 | 810,000,000
Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt issuance costs |  |  |  | 15,000,000 | 9,000,000
May 2018 Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior Notes issued in a private placement to a group of institutional investors |  |  | $ 400,000,000 |  |
Carrying value of Senior Notes |  |  |  | 400,000,000 | 400,000,000
Fair value of Senior Notes |  |  |  | 388,000,000 | 453,000,000
Debt instrument, maturity date |  |  | May 15, 2026 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.25% |  |
Dec 2019 Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Carrying value of Senior Notes |  |  |  | 900,000,000 | 350,000,000
Fair value of Senior Notes |  |  |  | $ 801,000,000 | $ 357,000,000
Senior Notes December Twenty one |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior Notes issued in a private placement to a group of institutional investors | $ 550,000,000 |  |  |  |
Debt instrument, maturity date | Jun. 15, 2028 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.00% |  |  |  |
Senior Notes 2019 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior Notes issued in a private placement to a group of institutional investors |  | $ 350,000,000 |  |  |
Debt instrument, maturity date |  | Jun. 15, 2028 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.00% |  |  |

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