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Financial Instruments - Equity Investments with Readily Determinable Fair Values (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Debt and Equity Securities, FV-NI [Line Items]          
Equity investments with readily determinable fair values $ 2,783   $ 2,783   $ 3,183
Affirm Holdings, Inc.          
Debt and Equity Securities, FV-NI [Line Items]          
Equity investments with readily determinable fair values 1,483   1,483   1,236
Global-E Online Ltd.          
Debt and Equity Securities, FV-NI [Line Items]          
Equity investments with readily determinable fair values 791   791   1,205
Klaviyo, Inc.          
Debt and Equity Securities, FV-NI [Line Items]          
Equity investments with readily determinable fair values 509   509   $ 742
Transfers out of level 3 $ 10 $ 8 $ 33 $ 25  
Klaviyo, Inc. | Discount for Lack of Marketability          
Debt and Equity Securities, FV-NI [Line Items]          
Warrant, measurement input 0.11   0.11   0.18
Level 1          
Debt and Equity Securities, FV-NI [Line Items]          
Equity investments with readily determinable fair values $ 2,715   $ 2,715   $ 3,056
Level 1 | Affirm Holdings, Inc.          
Debt and Equity Securities, FV-NI [Line Items]          
Equity investments with readily determinable fair values 1,483   1,483   1,236
Level 1 | Global-E Online Ltd.          
Debt and Equity Securities, FV-NI [Line Items]          
Equity investments with readily determinable fair values 791   791   1,205
Level 1 | Klaviyo, Inc.          
Debt and Equity Securities, FV-NI [Line Items]          
Equity investments with readily determinable fair values 441   441   615
Level 3          
Debt and Equity Securities, FV-NI [Line Items]          
Equity investments with readily determinable fair values 68   68   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 $ 68   $ 68   $ 127