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Goodwill and Other Intangible Assets - Goodwill - Additional Information (Details)
9 Months Ended
Jun. 30, 2022
USD ($)
Segment
Goodwill and Intangible Assets Disclosure [Abstract]  
Number of reportable segments | Segment 1
Number of Operating Segment | Segment 1
Estimate fair value $ 995,000,000
Reporting unit, carrying value 950,000,000
Reporting unit, amount of fair value in excess of carrying amount $ 45,000,000
Reporting Unit, Percentage of fair value in excess of carrying amount 5.00%
Goodwill impairment $ 0