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Financial Instruments - Additional Information (Details) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) $ / shares shares	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Derivative [Line Items]
Debt securities interest income			$ 130		$ 105
Net loss on equity method investment	$ 22	$ 24	43	$ 47
Unrealized gain (loss)	1,250	682	189	(339)
Klaviyo, Inc.
Derivative [Line Items]
Unrealized gain (loss)	(11)	14	(65)	(72)
Equity Securities Without Readily Determinable Fair Value
Derivative [Line Items]
Equity and Other Investments	$ 1,555	$ 988	$ 1,555	$ 988	$ 963	$ 970	$ 709	$ 717
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	0.19		0.19		0.21
Fair value	$ 9		$ 9		$ 75
Foreign Exchange Forward
Derivative [Line Items]
Foreign exchange forward contracts, notional value	777		777		$ 702
Level 3 \| Fair Value, Nonrecurring
Derivative [Line Items]
Equity and Other Investments	$ 1,376		$ 1,376