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Financial Instruments - Additional Information (Details)		1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended
	Nov. 03, 2025 USD ($)	Sep. 30, 2020	Dec. 31, 2025 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) $ / shares shares	Sep. 30, 2024 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Jun. 30, 2022 $ / shares
Derivative [Line Items]
Trade and other receivables				$ 396,000,000		$ 396,000,000			$ 342,000,000
Debt securities interest income						94,000,000			62,000,000
Net loss on equity method investment				21,000,000	$ 28,000,000	68,000,000	$ 116,000,000
Net gain (loss) on equity and other investments				(62,000,000)	512,000,000	(401,000,000)	63,000,000
Unrealized loss on embedded derivative				29,000,000	0	29,000,000	0
0.125% Convertible Senior Notes Due 2025 | Convertible Debt
Derivative [Line Items]
Conversion ratio		0.00069440
Conversion price (in dollars per share) | $ / shares													$ 144.01
Forecast | 0.125% Convertible Senior Notes Due 2025 | Convertible Debt
Derivative [Line Items]
Loss on settlement of Notes			$ 123,000,000					$ 123,000,000
Subsequent Event | 0.125% Convertible Senior Notes Due 2025 | Convertible Debt
Derivative [Line Items]
Settlement of Notes and embedded derivative	$ 1,000,000,000.0
Klaviyo, Inc.
Derivative [Line Items]
Net gain (loss) on equity and other investments				(75,000,000)	59,000,000	(147,000,000)	36,000,000
Equity Securities Without Readily Determinable Fair Value
Derivative [Line Items]
Equity and Other Investments				$ 974,000,000	$ 683,000,000	$ 974,000,000	$ 683,000,000		$ 717,000,000	$ 988,000,000	$ 683,000,000	$ 505,000,000
Call Option | Klaviyo, Inc.
Derivative [Line Items]
Option to purchase series B common shares | shares						15,743,174
Exercise price (in dollars per share) | $ / shares						$ 88.93
Discount for Lack of Marketability | Klaviyo, Inc.
Derivative [Line Items]
Derivative asset, measurement input				0.21		0.21			0.29
Fair value				$ 57,000,000		$ 57,000,000			$ 204,000,000
Foreign Exchange Forward
Derivative [Line Items]
Foreign exchange forward contracts, notional value				708,000,000		708,000,000			454,000,000
Level 3 | Fair Value, Nonrecurring
Derivative [Line Items]
Equity and Other Investments				824,000,000		824,000,000
Level 2
Derivative [Line Items]
Fair value of embedded derivative				29,000,000		29,000,000
Level 2 | Foreign Exchange Forward
Derivative [Line Items]
Fair value				2,000,000		2,000,000			0
Accrued interest
Derivative [Line Items]
Trade and other receivables				$ 36,000,000		$ 36,000,000			$ 19,000,000

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