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Investments - Narrative (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended						9 Months Ended		12 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 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	$ 803		$ 1,665				$ 803		$ 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	68		361				68		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	$ 2,410
Equity securities without readily determinable fair value, amount	798		1,011				798		1,011
Cash distribution							227	0
Unrealized gains (losses) related to the change in fair value of the investment	(9)			$ 19			(17)	(244)
Investments | Recurring
Schedule of Investments [Line Items]
Asset, fair value	51		$ 54				51		$ 54
Adevinta
Schedule of Investments [Line Items]
Ownership percentage after sale						33.00%
Unrealized gains (losses) related to the change in fair value of the investment	0			0			0	(234)
Realized gain on sale of equity securities	0			0			0	78
Adevinta | Aurelia BidCo 1 Norway AS
Schedule of Investments [Line Items]
Number of voting shares sold (in shares)					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 (in shares)					177
Aurelia
Schedule of Investments [Line Items]
Number of voting shares sold (in shares)			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
Aurelia option				74				74
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
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	$ 145		145				$ 145		145
Gmarket
Schedule of Investments [Line Items]
Total consideration from sale of equity securities			$ 322						323
Ownership percentage after sale			19.99%
Unrealized gains (losses) related to the change in fair value of the investment	$ 0			$ 16			$ 0	$ (12)
Investment balance			$ 323						323
Asset, fair value			$ 0						$ 0	$ 335

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