Significant Restructuring and Impairment Costs - Schedule of Restructuring Reserve by Type of Cost (Details) $ in Millions	3 Months Ended
	Dec. 31, 2022 USD ($)
Restructuring Reserve [Roll Forward]
Original reserve	$ 57
Utilized—cash	(8)
Utilized—noncash	(6)
Balance at December 31, 2022	43
Employee Severance and Termination Benefits
Restructuring Reserve [Roll Forward]
Original reserve	30
Utilized—cash	(3)
Utilized—noncash	0
Balance at December 31, 2022	27
Long-Lived Asset Impairments
Restructuring Reserve [Roll Forward]
Original reserve	6
Utilized—cash	0
Utilized—noncash	(6)
Balance at December 31, 2022	0
Other
Restructuring Reserve [Roll Forward]
Original reserve	21
Utilized—cash	(5)
Utilized—noncash	0
Balance at December 31, 2022	$ 16