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Significant Restructuring and Impairment Costs - Narrative (Details)
$ in Millions
 12 Months Ended 24 Months Ended
Sep. 30, 2022
USD ($)
employee
Sep. 30, 2022
USD ($)
employee
Restructuring Cost and Reserve [Line Items]    
Number of employees to be severed | employee   6,200
Restructuring and related cost, number of positions eliminated, inception to date | employee 4,000 4,000
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration] Restructuring and impairment costs  
2021 Restructuring Plan    
Restructuring Cost and Reserve [Line Items]    
Restructuring and related cost, expected cost | $ $ 385 $ 385
Restructuring and impairment costs, costs incurred to date | $ $ 424 $ 424