Segment Information - Schedule of Adjusted EBITDA (Details) - USD ($)	3 Months Ended		6 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025
Segment Reporting Information [Line Items]
Revenues	$ 2,256,000,000	$ 2,159,000,000	$ 4,481,000,000	$ 4,286,000,000
Segment cost of revenues	707,000,000	716,000,000	1,434,000,000	1,430,000,000
Other segment items	420,000,000	407,000,000	851,000,000	828,000,000
Segment adjusted EBITDA	1,129,000,000	1,036,000,000	2,196,000,000	2,028,000,000
Depreciation, amortization and accretion expense	(502,000,000)	(490,000,000)	(982,000,000)	(1,015,000,000)
Stock-based compensation expense	(127,000,000)	(125,000,000)	(240,000,000)	(226,000,000)
Transaction costs	(3,000,000)	(3,000,000)	(9,000,000)	(5,000,000)
Restructuring charges	(2,000,000)	0	(12,000,000)	0	$ (43,000,000)
Impairment charges	(1,000,000)	0	(1,000,000)	0
Gain (loss) on asset sales	0	18,000,000	0	18,000,000
Interest income	52,000,000	29,000,000	99,000,000	53,000,000
Interest expense	(135,000,000)	(110,000,000)	(257,000,000)	(214,000,000)
Other income (expense)	(7,000,000)	(7,000,000)	2,000,000	(13,000,000)
Gain (loss) on debt extinguishment	1,000,000	0	1,000,000	(1,000,000)
Income before income taxes	405,000,000	348,000,000	797,000,000	625,000,000
UNITED STATES
Segment Reporting Information [Line Items]
Revenues	871,000,000	825,000,000	1,700,000,000	1,600,000,000
Colocation
Segment Reporting Information [Line Items]
Revenues	1,585,000,000	1,500,000,000	3,130,000,000	2,990,000,000
Interconnection
Segment Reporting Information [Line Items]
Revenues	407,000,000	374,000,000	800,000,000	742,000,000
Managed infrastructure
Segment Reporting Information [Line Items]
Revenues	117,000,000	116,000,000	232,000,000	234,000,000
Other
Segment Reporting Information [Line Items]
Revenues	34,000,000	34,000,000	68,000,000	68,000,000
Recurring revenues
Segment Reporting Information [Line Items]
Revenues	2,143,000,000	2,024,000,000	4,230,000,000	4,034,000,000
Non-recurring revenues
Segment Reporting Information [Line Items]
Revenues	113,000,000	135,000,000	251,000,000	252,000,000
Americas
Segment Reporting Information [Line Items]
Revenues	1,004,000,000	966,000,000	2,005,000,000	1,905,000,000
Segment cost of revenues	290,000,000	273,000,000	580,000,000	543,000,000
Other segment items	248,000,000	242,000,000	516,000,000	502,000,000
Segment adjusted EBITDA	466,000,000	451,000,000	909,000,000	860,000,000
Americas | Colocation
Segment Reporting Information [Line Items]
Revenues	654,000,000	624,000,000	1,290,000,000	1,231,000,000
Americas | Interconnection
Segment Reporting Information [Line Items]
Revenues	231,000,000	219,000,000	460,000,000	434,000,000
Americas | Managed infrastructure
Segment Reporting Information [Line Items]
Revenues	62,000,000	66,000,000	125,000,000	132,000,000
Americas | Other
Segment Reporting Information [Line Items]
Revenues	4,000,000	7,000,000	7,000,000	13,000,000
Americas | Recurring revenues
Segment Reporting Information [Line Items]
Revenues	951,000,000	916,000,000	1,882,000,000	1,810,000,000
Americas | Non-recurring revenues
Segment Reporting Information [Line Items]
Revenues	53,000,000	50,000,000	123,000,000	95,000,000
EMEA
Segment Reporting Information [Line Items]
Revenues	767,000,000	721,000,000	1,510,000,000	1,448,000,000
Segment cost of revenues	264,000,000	299,000,000	545,000,000	604,000,000
Other segment items	104,000,000	98,000,000	201,000,000	192,000,000
Segment adjusted EBITDA	399,000,000	324,000,000	764,000,000	652,000,000
EMEA | Colocation
Segment Reporting Information [Line Items]
Revenues	572,000,000	543,000,000	1,139,000,000	1,092,000,000
EMEA | Interconnection
Segment Reporting Information [Line Items]
Revenues	96,000,000	84,000,000	183,000,000	167,000,000
EMEA | Managed infrastructure
Segment Reporting Information [Line Items]
Revenues	38,000,000	34,000,000	73,000,000	69,000,000
EMEA | Other
Segment Reporting Information [Line Items]
Revenues	26,000,000	24,000,000	53,000,000	48,000,000
EMEA | Recurring revenues
Segment Reporting Information [Line Items]
Revenues	732,000,000	685,000,000	1,448,000,000	1,376,000,000
EMEA | Non-recurring revenues
Segment Reporting Information [Line Items]
Revenues	35,000,000	36,000,000	62,000,000	72,000,000
Asia-Pacific
Segment Reporting Information [Line Items]
Revenues	485,000,000	472,000,000	966,000,000	933,000,000
Segment cost of revenues	153,000,000	144,000,000	309,000,000	283,000,000
Other segment items	68,000,000	67,000,000	134,000,000	134,000,000
Segment adjusted EBITDA	264,000,000	261,000,000	523,000,000	516,000,000
Asia-Pacific | Colocation
Segment Reporting Information [Line Items]
Revenues	359,000,000	333,000,000	701,000,000	667,000,000
Asia-Pacific | Interconnection
Segment Reporting Information [Line Items]
Revenues	80,000,000	71,000,000	157,000,000	141,000,000
Asia-Pacific | Managed infrastructure
Segment Reporting Information [Line Items]
Revenues	17,000,000	16,000,000	34,000,000	33,000,000
Asia-Pacific | Other
Segment Reporting Information [Line Items]
Revenues	4,000,000	3,000,000	8,000,000	7,000,000
Asia-Pacific | Recurring revenues
Segment Reporting Information [Line Items]
Revenues	460,000,000	423,000,000	900,000,000	848,000,000
Asia-Pacific | Non-recurring revenues
Segment Reporting Information [Line Items]
Revenues	$ 25,000,000	$ 49,000,000	$ 66,000,000	$ 85,000,000