Restructuring - Restructuring Activities and Related Reserves (Details) $ in Millions	3 Months Ended
	Dec. 31, 2023 USD ($)
Restructuring Cost and Reserve [Line Items]
Reserve balance	$ 0
Charges	9
Cost charged against assets	(6)
Cash paid	(1)
Reserve balance	2
Severance and Employee Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Reserve balance	0
Charges	3
Cash paid	(1)
Reserve balance	2
Accelerated Depreciation on Assets [Member]
Restructuring Cost and Reserve [Line Items]
Reserve balance	0
Charges, Accelerated depreciation on assets	6
Cost charged against assets	$ (6)