Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Millions |
3 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Mar. 31, 2026 |
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2024 |
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| Intangible Asset, Goodwill and Other [Abstract] | ||||
| Goodwill and intangible asset impairment | $ 0 | $ 0 | $ 224 | $ 0 |
| Software products amortization expense | 11 | $ 11 | $ 12 | |
| Estimated amortization expense in 2027 | 123 | |||
| Estimated amortization expense in 2028 | 110 | |||
| Estimated amortization expense in 2029 | 73 | |||
| Estimated amortization expense in 2030 | 71 | |||
| Estimated amortization expense in 2031 | $ 58 | |||
| X | ||||||||||
- Definition Amount of amortization expense for capitalized cost for software to be sold, leased, or marketed. Excludes capitalized cost for internal-use software. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of impairment loss for finite- and indefinite-lived intangible assets, goodwill, and capitalized cost for software to be sold, leased, or marketed. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of amortization expense for finite-lived intangible asset and capitalized cost for software to be sold, leased, or marketed, expected to be recognized in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Excludes goodwill. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of amortization expense for finite-lived intangible asset and capitalized cost for software to be sold, leased, or marketed, expected to be recognized in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Excludes goodwill. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of amortization expense for finite-lived intangible asset and capitalized cost for software to be sold, leased, or marketed, expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Excludes goodwill. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of amortization expense for finite-lived intangible asset and capitalized cost for software to be sold, leased, or marketed, expected to be recognized in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Excludes goodwill. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of amortization expense for finite-lived intangible asset and capitalized cost for software to be sold, leased, or marketed, expected to be recognized in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Excludes goodwill. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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