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Financial Instruments - Equity Investments with Readily Determinable Fair Values (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Debt and Equity Securities, FV-NI [Line Items]
Equity investments with readily determinable fair values	$ 2,755		$ 2,755		$ 3,183
Affirm Holdings, Inc.
Debt and Equity Securities, FV-NI [Line Items]
Equity investments with readily determinable fair values	1,403		1,403		1,236
Global-E Online Ltd.
Debt and Equity Securities, FV-NI [Line Items]
Equity investments with readily determinable fair values	742		742		1,205
Klaviyo, Inc.
Debt and Equity Securities, FV-NI [Line Items]
Equity investments with readily determinable fair values	610		610		$ 742
Transfers out of level 3	$ 9	$ 8	$ 14	$ 17
Klaviyo, Inc. \| Discount for Lack of Marketability
Debt and Equity Securities, FV-NI [Line Items]
Warrant, measurement input	0.17		0.17		0.18
Level 1
Debt and Equity Securities, FV-NI [Line Items]
Equity investments with readily determinable fair values	$ 2,669		$ 2,669		$ 3,056
Level 1 \| Affirm Holdings, Inc.
Debt and Equity Securities, FV-NI [Line Items]
Equity investments with readily determinable fair values	1,403		1,403		1,236
Level 1 \| Global-E Online Ltd.
Debt and Equity Securities, FV-NI [Line Items]
Equity investments with readily determinable fair values	742		742		1,205
Level 1 \| Klaviyo, Inc.
Debt and Equity Securities, FV-NI [Line Items]
Equity investments with readily determinable fair values	524		524		615
Level 3
Debt and Equity Securities, FV-NI [Line Items]
Equity investments with readily determinable fair values	86		86		127
Level 3 \| Affirm Holdings, Inc.
Debt and Equity Securities, FV-NI [Line Items]
Equity investments with readily determinable fair values	0		0		0
Level 3 \| Global-E Online Ltd.
Debt and Equity Securities, FV-NI [Line Items]
Equity investments with readily determinable fair values	0		0		0
Level 3 \| Klaviyo, Inc.
Debt and Equity Securities, FV-NI [Line Items]
Equity investments with readily determinable fair values	$ 86		$ 86		$ 127