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Financial Instruments - Equity Investments with Readily Determinable Fair Values (Details) $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($)
Debt and Equity Securities, FV-NI [Line Items]
Equity investments with readily determinable fair values	$ 1,975		$ 2,986
Affirm Holdings, Inc.
Debt and Equity Securities, FV-NI [Line Items]
Equity investments with readily determinable fair values	930		1,511
Global-E Online Ltd.
Debt and Equity Securities, FV-NI [Line Items]
Equity investments with readily determinable fair values	682		868
Klaviyo, Inc.
Debt and Equity Securities, FV-NI [Line Items]
Equity investments with readily determinable fair values	360		$ 599
Transfers out of level 3	$ 11	$ 14
Klaviyo, Inc. \| Discount for Lack of Marketability
Debt and Equity Securities, FV-NI [Line Items]
Warrant, measurement input	0.10		0.11
Other
Debt and Equity Securities, FV-NI [Line Items]
Equity investments with readily determinable fair values	$ 3		$ 8
Level 1
Debt and Equity Securities, FV-NI [Line Items]
Equity investments with readily determinable fair values	1,939		2,916
Level 1 \| Affirm Holdings, Inc.
Debt and Equity Securities, FV-NI [Line Items]
Equity investments with readily determinable fair values	930		1,511
Level 1 \| Global-E Online Ltd.
Debt and Equity Securities, FV-NI [Line Items]
Equity investments with readily determinable fair values	682		868
Level 1 \| Klaviyo, Inc.
Debt and Equity Securities, FV-NI [Line Items]
Equity investments with readily determinable fair values	324		529
Level 1 \| Other
Debt and Equity Securities, FV-NI [Line Items]
Equity investments with readily determinable fair values	3		8
Level 3
Debt and Equity Securities, FV-NI [Line Items]
Equity investments with readily determinable fair values	36		70
Level 3 \| Affirm Holdings, Inc.
Debt and Equity Securities, FV-NI [Line Items]
Equity investments with readily determinable fair values	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
Level 3 \| Klaviyo, Inc.
Debt and Equity Securities, FV-NI [Line Items]
Equity investments with readily determinable fair values	36		70
Level 3 \| Other
Debt and Equity Securities, FV-NI [Line Items]
Equity investments with readily determinable fair values	$ 0		$ 0