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Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount of indefinite-lived intangible assets |  | $ 614 |
Gross carrying amount of total other intangibles |  | 534 | $ 540
Accumulated Amortization |  | 407 | 390
Net carrying amount of finite-lived and indefinite-lived intangible assets |  | 127 | 150
Indefinite life—Trademarks |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount of indefinite-lived intangible assets | [1] | 586 | 611
Indefinite life—Title plant shares |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount of indefinite-lived intangible assets | [2] | 28 | 28
Amortizable—Franchise agreements |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | [3] | 2,010 | 2,010
Accumulated Amortization | [3] | 1,123 | 1,056
Net carrying amount of finite-lived intangible assets | [3] | 887 | 954
Amortizable—License agreements |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | [4] | 45 | 45
Accumulated Amortization | [4] | 16 | 15
Net carrying amount of finite-lived intangible assets | [4] | $ 29 | 30
Amortization period |  | 50 years |
Amortizable—Customer relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | [5] | $ 454 | 456
Accumulated Amortization | [5] | 385 | 366
Net carrying amount of finite-lived intangible assets | [5] | 69 | 90
Amortizable—Other |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | [6] | 7 | 11
Accumulated Amortization | [6] | 6 | 9
Net carrying amount of finite-lived intangible assets | [6] | $ 1 | $ 2
Minimum | Amortizable—Customer relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization period |  | 10 years |
Minimum | Amortizable—Other |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization period |  | 3 years |
Maximum | Amortizable—Customer relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization period |  | 20 years |
Maximum | Amortizable—Other |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization period |  | 5 years |
Franchise Group | Indefinite life—Trademarks |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill) |  | Costs and Expenses | Costs and Expenses
Franchise Group | Amortizable—Franchise agreements |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization period |  | 30 years |
[1] | Primarily related to real estate franchise, title and relocation trademarks which are expected to generate future cash flows for an indefinite period of time. Franchise trademarks were impaired by $25 million during the fourth quarter of 2023 as a result of the Company's annual impairment assessment.
[2] | Ownership in a title plant is required to transact title insurance in certain states. The Company expects to generate future cash flows for an indefinite period of time.
[3] | Generally amortized over a period of 30 years.
[4] | Relates to the Sotheby’s International Realty® and Better Homes and Gardens® Real Estate agreements which are being amortized over 50 years (the contractual term of the license agreements).
[5] | Relates to the customer relationships which are being amortized over a period of 10 to 20 years.
[6] | Consists of covenants not to compete which are amortized over their contract lives and other intangibles which are generally amortized over periods ranging from 3 to 5 years.

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