Restructuring and Other Exit Activities - Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025
Restructuring Cost and Reserve [Line Items]
Severance and other employee costs	$ 5		$ 28
Stock-based compensation expense			3
Other exit costs	5		10
Total	10	$ 0	41
Americas
Restructuring Cost and Reserve [Line Items]
Incurred cost	8
EMEA
Restructuring Cost and Reserve [Line Items]
Incurred cost	1
Asia Pacific
Restructuring Cost and Reserve [Line Items]
Incurred cost	1
Q4 2024 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Severance and other employee costs	3		22
Stock-based compensation expense			3
Other exit costs	3		8
Total	6		33
Incurred cost			33
Equinix Metal Wind Down
Restructuring Cost and Reserve [Line Items]
Severance and other employee costs	2		6
Stock-based compensation expense			0
Other exit costs	2		2
Total	$ 4		8
Incurred cost			$ 8