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Investments - Narrative (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Schedule of Investments [Line Items] |  |  |  |  |  |  |
Investment securities in a continuous unrealized loss position for less then 12 months | $ 1,506 | $ 1,665 |  | $ 1,506 |  | $ 1,665 |
Investment securities unrealized loss | 1 | 4 |  | 1 |  | 4 |
Estimated fair value for securities in continuous unrealized loss position for greater than 12 months | 238 | 361 |  | 238 |  | 361 |
Investment securities in a continuous loss position for greater than 12 months, unrealized losses | 2 | 8 |  | 2 |  | 8 |
Total consideration from sale of equity securities |  |  |  | 0 | $ 2,417 |  |
Equity securities without readily determinable fair value, amount | 797 | 1,011 |  | 797 |  | 1,011 |
Change in fair value of Aurelia option | 0 |  | $ (109) | 0 | (109) |  |
Cash distribution |  |  |  | 225 | 0 |  |
Unrealized losses related to the change in fair value of the investment | 4 |  | $ 23 | 8 | 263 |  |
Investments | Recurring |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |
Asset, fair value | 50 | $ 54 |  | 50 |  | $ 54 |
Adevinta |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |
Ownership percentage after sale |  |  | 33.00% |  |  |  |
Realized gain on sale of equity securities | 0 |  | $ 84 | 0 | 78 |  |
Unrealized losses related to the change in fair value of the investment | 0 |  | $ 0 | 0 | $ 234 |  |
Adevinta | Aurelia BidCo 1 Norway AS |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |
Number of voting shares sold |  |  | 227 |  | 227 |  |
Total consideration from sale of equity securities |  |  | $ 2,400 |  |  |  |
Ownership percentage after sale |  |  | 18.30% |  |  |  |
Adevinta | Aurelia Netherlands TopCo B.V |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |
Number of voting shares sold |  |  | 177 |  | 177 |  |
Aurelia |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |
Number of voting shares sold |  | 97 |  |  |  | 97 |
Total consideration from sale of equity securities |  | $ 1,000 |  |  |  |  |
Equity securities without readily determinable fair value, amount | 653 | 867 |  | $ 653 |  | $ 867 |
Purchase option term |  |  | 6 months |  |  |  |
Cash distribution | 225 |  |  |  |  |  |
Reduction in carrying value of investment | 214 |  |  |  |  |  |
Foreign exchange gain | $ 11 |  |  |  |  |  |
Aurelia | Aurelia UK Feederco Limited |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |
Equity securities without readily determinable fair value, amount |  |  | $ 1,900 |  | $ 1,900 |  |
Fair value of equity outstanding percentage | 8.30% |  |  | 8.30% |  |  |
Individually Immaterial Equity Investments |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |
Equity securities without readily determinable fair value, amount | $ 144 | 144 |  | $ 144 |  | 144 |
Gmarket |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |
Total consideration from sale of equity securities |  | $ 322 |  |  |  | 323 |
Ownership percentage after sale |  | 19.99% |  |  |  |  |
Unrealized losses related to the change in fair value of the investment | $ 0 |  | $ 22 | $ 0 | $ 28 |  |
Investment balance |  | $ 323 |  |  |  | 323 |
Asset, fair value |  | $ 0 |  |  |  | $ 0 | $ 335

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